repo stringlengths 8 123 | branch stringclasses 178 values | readme stringlengths 1 441k ⌀ | description stringlengths 1 350 ⌀ | topics stringlengths 10 237 | createdAt stringlengths 20 20 | lastCommitDate stringlengths 20 20 | lastReleaseDate stringlengths 20 20 ⌀ | contributors int64 0 10k | pulls int64 0 3.84k | commits int64 1 58.7k | issues int64 0 826 | forks int64 0 13.1k | stars int64 2 49.2k | diskUsage float64 | license stringclasses 24 values | language stringclasses 80 values |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
wasm-fmt/web_fmt | main | [](https://github.com/wasm-fmt/web_fmt/actions/workflows/test.yml)
## [web_fmt](./crates/web_fmt/README.md) [](https://www.npmjs.com/package/@wasm-fmt/web_fmt)[](https://jsr.io/@fmt/web-fmt)
```bash
npm install @wasm-fmt/web_fmt
```
## [biome_fmt](./crates/biome_fmt/README.md) [](https://www.npmjs.com/package/@wasm-fmt/biome_fmt)[](https://jsr.io/@fmt/biome-fmt)
```bash
npm install @wasm-fmt/biome_fmt
```
## [json_fmt](./crates/json_fmt/README.md) [](https://www.npmjs.com/package/@wasm-fmt/json_fmt)[](https://jsr.io/@fmt/json-fmt)
```bash
npm install @wasm-fmt/json_fmt
```
# Credits
Thanks to:
- The [Biome](https://github.com/biomejs/biome) project for the TS/JS/JSON
formatter.
- The [malva](https://github.com/g-plane/malva) project and
[markup_fmt](https://github.com/g-plane/markup_fmt) project created by
[@g-plane](https://github.com/g-plane).
| A WASM Formatter for Web Developer | TS / JS / JSON / CSS / HTML | formatter,formatting,javascript,jsx,prettier,react,rome,tsx,typescript,wasm | 2023-08-27T17:10:56Z | 2024-05-18T07:55:04Z | 2024-03-13T06:08:42Z | 2 | 55 | 92 | 0 | 0 | 7 | null | MIT | Rust |
MohammedShwabi/maktabati | main | <p align="center">
<a href="https://github.com/MohammedShwabi/maktabati">
<img src="img/logo.png" alt="Logo" height="100"></a>
</p>
<h1 align="center">maktabati</h1>
<div align="center">
![Status][status-shield]
[![GitHub Pull Requests][pull-shield]][pull-url]
[![License][license-shield]][license-url]
</div>
<p align="center">
Electronic library management website
<br>
</p>
## 📝 Table of Contents
- [About](#about)
- [Screenshots](#screenshots)
- [Built Using](#built_using)
- [Prerequisites](#prerequisites)
- [Getting Started](#getting_started)
- [Clone the Repository](#clone)
- [Setting Up the Environment](#environment)
- [Database Setup](#db_setup)
- [Running the Project](#running_project)
- [Troubleshooting](#troubleshooting)
- [Future Work Recommendations](#recommendations)
- [Contributing](#contributing)
- [License](#license)
- [Authors](#authors)
## 🧐 About <a name = "about"></a>
![web site story page][books-screenshot]
Maktabati is a PHP web project designed for managing an electronic library.
This project includes a control panel that allows you to efficiently manage your library's resources.
You can easily add, delete, and edit both books, authors, and categories, making it a powerful tool for library administration.
## Features
- **Library Management**: Add, delete, and edit books, authors, and categories.
- **Advanced Search**: Utilize the advanced search feature to find specific resources within the library.
- **Book Information**: View detailed information about each book, including ratings.
- **Electronic Copies**: Upload electronic copies of books for easy access.
<br>
<!-- :camera: -->
## 📷 Screenshots <a name = "screenshots"></a>
<b>Here are some screenshots of the project:</b>
<b>Login Page:</b>
![Login Page][login-screenshot]
<b>Books List Page:</b>
![books list page][books-screenshot]
<b>Categories List Page:</b>
![categories list page][categories-screenshot]
<b>Authors List Page:</b>
![authors list page][authors-screenshot]
<b>Advance Search Page:</b>
![advance search page][advance-screenshot]
<b>Book Details Page:</b>
![book details page][book-details-screenshot]
## ⛏️ Built Using <a name = "built_using"></a>
* [![php][php.com]][php-url]
* [![MySQL][MySQL.com]][MySQL-url]
* [![Bootstrap][Bootstrap.com]][Bootstrap-url]
* [![JQuery][JQuery.com]][JQuery-url]
<!-- :gear: -->
## ⚙️ Prerequisites <a name = "prerequisites"></a>
Before you begin, ensure you have met the following requirements:
- **PHP** (>= 8.2.4) installed on your local machine.
- **Apache** (>= 2.4.56) installed and configured.
- **MySQL** (>= 8.2.4) or MariaDB database server.
- **Git** You'll need Git to clone the repository.
<!-- :checkered_flag: -->
## 🏁 Getting Started <a name = "getting_started"></a>
These instructions will get you a copy of the project up and running on your local machine for development and testing purposes.
<!-- :open_file_folder: -->
## 📂 Clone the Repository <a name = "clone"></a>
Open your terminal/command prompt and run the following command to clone the repository:
```bash
git clone https://github.com/MohammedShwabi/maktabati
```
## 💻 Setting Up the Environment <a name = "environment"></a>
1. Configure your web server to serve the project from the cloned directory. For example, with Apache, you can create a virtual host configuration:
```apacheconf
<VirtualHost *:80>
ServerName maktabati.local
DocumentRoot "/path/to/maktabati"
<Directory "/path/to/maktabati">
Options Indexes FollowSymLinks
AllowOverride All
Require all granted
</Directory>
</VirtualHost>
```
Replace "/path/to/maktabati" with the actual path to your project directory.
2. Update your system's hosts file to point the domain to your local machine. On most systems, you can find this file at /etc/hosts (Linux/Mac) or C:\Windows\System32\drivers\etc\hosts (Windows). Add an entry like this:
```lua
127.0.0.1 maktabati.local
```
## 💾 Database Setup <a name = "db_setup"></a>
1. Create a MySQL or MariaDB database for maktabati. You can do this using a tool like phpMyAdmin or via the command line:
```sql
CREATE DATABASE maktabati;
```
<!-- [Hekayti-Api-Documentation.xlsx](HekaytiApiDocumentationAndCollection/Hekayti-Api-Documentation.xlsx) -->
2. Import the [`maktabati.sql`](maktabati.sql) file into your newly created database. You can do this using the command-line MySQL client:
```bash
mysql -u your_username -p maktabati < maktabati.sql
```
Replace 'your_username' with your database username and enter the corresponding password when prompted.
3. Verify that the tables and test data have been imported successfully:
```sql
USE maktabati;
SHOW TABLES;
```
This should display a list of tables, indicating that the database setup was successful.
## 🚀 Running the Project <a name = "running_project"></a>
Now that you have set up the project and the database, you can run the maktabati project on your local web server. Open a web browser and navigate to http://maktabati.local (or the domain you configured in your web server).
2. enter the following credential to login to the web panel:
```js
email: mohamed@gmail.com
password: 123
```
<!-- :warning: -->
## ⚠️ Troubleshooting <a name = "troubleshooting"></a>
<p>If you encounter any issues during the setup process, refer to the <a href="https://www.php.net/docs.php" target="_new">PHP documentation</a> or search for solutions on <a href="https://stackoverflow.com/" target="_new">Stack Overflow</a>.</p>
<!-- 💡 -->
## 🔧 Future Work Recommendations <a name = "recommendations"></a>
While the current version of Maktabati is functional, there are several areas where the project can be further developed and enhanced:
- 👥 User management system.
- 👤 User pages and user profiles.
- 🌍 Support for multiple languages for books, authors and publishers.
- 🧹 Sorting and filtering options for books.
- 👥 Ability to associate multiple authors with a book.
If you are interested in contributing to the project, consider working on these future enhancements to make Maktabati even better!
## 📱 Mobile App
A mobile app version of maktabati is also available. You can find the mobile app implementation of this project on GitHub:
- [Maktabati Mobile App Repository](https://github.com/almomyz/maktabati)
The mobile app complements the web project and extends its functionality to mobile devices, providing a seamless user experience across platforms. Feel free to check it out and contribute to both the web and mobile versions of maktabati!
<!-- :raised_hands: -->
## 🙌 Contributing <a name = "contributing"></a>
If you'd like to contribute to the project, feel free to submit pull requests.
<!-- :scroll: -->
## 📜 License <a name = "license"></a>
<p>This project is licensed under the <a href="https://github.com/MohammedShwabi/maktabati/blob/main/LICENSE.md">MIT License</a>.</p>
## ✍️ Authors <a name = "authors"></a>
- [@MohammedShwabi](https://github.com/MohammedShwabi)
- [@HeshamNoaman](https://github.com/HeshamNoaman)
See also the list of [contributors](https://github.com/MohammedShwabi/maktabati/contributors) who participated in this project.
<!-- MARKDOWN LINKS & IMAGES -->
<!-- https://www.markdownguide.org/basic-syntax/#reference-style-links -->
<!-- small icon -->
[status-shield]: https://img.shields.io/badge/status-active-success.svg
[pull-shield]: https://img.shields.io/github/issues-pr/kylelobo/The-Documentation-Compendium.svg
[pull-url]: https://github.com/MohammedShwabi/hekayti-laravel/issues/pulls
[license-shield]: https://img.shields.io/badge/license-MIT-blue.svg
[license-url]: https://github.com/MohammedShwabi/maktabati/blob/main/LICENSE.md
<!-- built using icons -->
[php.com]: https://img.shields.io/badge/php-777BB4?style=for-the-badge&logo=php&logoColor=white
[php-url]: https://www.php.net/
[Bootstrap.com]: https://img.shields.io/badge/Bootstrap-563D7C?style=for-the-badge&logo=bootstrap&logoColor=white
[Bootstrap-url]: https://getbootstrap.com
[JQuery.com]: https://img.shields.io/badge/jQuery-0769AD?style=for-the-badge&logo=jquery&logoColor=white
[JQuery-url]: https://jquery.com
[MySQL.com]: https://img.shields.io/badge/mysql-4479A1?style=for-the-badge&logo=mysql&logoColor=white
[MySQL-url]: https://mysql.com/
<!-- image -->
[login-screenshot]: /screenshot/screenshot.jpeg
[books-screenshot]: /screenshot/screenshot1.jpeg
[categories-screenshot]: /screenshot/screenshot2.jpeg
[authors-screenshot]: /screenshot/screenshot3.jpeg
[advance-screenshot]: /screenshot/screenshot4.jpeg
[book-details-screenshot]: /screenshot/screenshot5.jpeg
| PHP web project designed for managing an electronic library. | css,html,javascript,jquery,library,library-management-system,library-system,mysql,php,pure-php | 2023-09-01T13:44:05Z | 2023-09-19T06:58:49Z | null | 2 | 0 | 36 | 0 | 1 | 7 | null | MIT | PHP |
muhammed-gumus/MergeBot | demo | # MergeBot
### What is the MergeBot
MergeBot is an open source bot developed with Javascript, which is used to compile Pull Requests in a date range that you specify in Pull Requests in a GitHub repository you specify in a markdown(md) file.
- Pull the repository to your local
`
git clone https://github.com/muhammed-gumus/MergeBot.git
`
- Install setups and dependencies
`
npm install -y
`
- Run the MergeBot
`
node bot.js
`
## How does it work
> :warning: Make sure you follow the installation instructions first!
#### Step 1: Run `node bot.js` in your terminal
<img width="1189" alt="Ekran Resmi 2023-09-02 15 14 12" src="https://github.com/muhammed-gumus/MergeBot/assets/86381278/30a9039e-42f8-45bc-98ea-66a7bc072b17">
#### Step 2: Our Markdown(md) file is ready to use.
<img width="1419" alt="Ekran Resmi 2023-08-26 02 01 04" src="https://github.com/muhammed-gumus/MergeBot/assets/86381278/a6850e23-9d5f-40ea-891a-27afb1850bda">
#### Step 3: This is how the file we created appears on GitHub.
<img width="1470" alt="Ekran Resmi 2023-08-26 02 05 22" src="https://github.com/muhammed-gumus/MergeBot/assets/86381278/e94eb739-a533-4281-930d-950f9aa43bb3">
| A sweet javascript bot that offers pull requests from the repository you want in the date range you want as a markdowon file. | bot,github-api,javascript,nodejs | 2023-08-25T20:20:13Z | 2023-09-02T12:19:28Z | null | 1 | 1 | 7 | 0 | 0 | 7 | null | null | JavaScript |
Alexandrbig1/WebStudio | main | # WebStudio - Responsive Web Design Project
<img align="right" src="https://media.giphy.com/media/du3J3cXyzhj75IOgvA/giphy.gif" width="100"/>
[](https://github.com/Alexandrbig1/WebStudio/commits/main)
[](https://github.com/Alexandrbig1/WebStudio/blob/main/LICENSE)
[](https://developer.mozilla.org/en-US/docs/Web/JavaScript)
[](https://developer.mozilla.org/en-US/docs/Web/HTML)
[](https://developer.mozilla.org/en-US/docs/Web/CSS)
## Overview
WebStudio is a responsive web design project created for a fictional company named "WebStudio." This freelance project focuses on delivering a modern and visually appealing web presence using HTML, CSS, and JavaScript. The website consists of a home page called "Studio" and a portfolio page, each with unique features and functionality.
## Features
- **Responsive Design:** Ensures optimal viewing and interaction experience across a wide range of devices.
- **Interactive CTA Button:** Clicking the Call-to-Action (CTA) button on the Studio page opens a modal window where users can leave their contacts to receive a callback.
- **Burger Menu:** The navigation menu on both the Studio and Portfolio pages is hidden behind a burger icon on laptops and phones, optimizing space and improving navigation on smaller screens.
- **Portfolio Animation:** Hovering over the project cards on the Portfolio page triggers an animation popup, providing additional information about each project.
## Pages
### Studio
- **Introduction:** An explanation of the company's strategy and services.
- **Team Section:** Profile cards featuring members of the WebStudio team.
- **Customers Section:** Logos of satisfied customers.
- **Footer:** Studio information, social media links, and a newsletter subscription.
### Portfolio
- **Project Cards:** Displaying completed works, each with an animation popup when hovered over.
## Technologies
- 
- 
- 
## Screenshots
_Caption for Screenshot 1 (WebStudio Studio Page)_
_Caption for Screenshot 2 (WebStudio Portfolio Page Dark Theme)_
## Usage
- Explore the responsive design on different devices.
- Experience the interactive features on the Studio page, such as the CTA modal window.
- Navigate to the Portfolio page to view project cards with animation popups.
## Contact Us
Leave your contact information in the CTA modal on the Studio page, and we will get back to you as soon as possible.
## About WebStudio
WebStudio is a fictional web design and development studio that focuses on creating innovative and responsive web solutions for clients. Connect with us on social media to stay updated on our latest projects and news.
## Issues
If you encounter any issues or have suggestions, please
[open an issue](https://github.com/Alexandrbig1/WebStudio/issues).
## License
This project is licensed under the [MIT License](LICENSE).
## Feedback
I welcome feedback and suggestions from users to improve the application's
functionality and user experience.
### Languages and Tools:
<div align="center">
<a href="https://en.wikipedia.org/wiki/HTML5" target="_blank"><img style="margin: 10px" src="https://profilinator.rishav.dev/skills-assets/html5-original-wordmark.svg" alt="HTML5" height="50" /></a>
<a href="https://www.w3schools.com/css/" target="_blank"><img style="margin: 10px" src="https://profilinator.rishav.dev/skills-assets/css3-original-wordmark.svg" alt="CSS3" height="50" /></a>
<a href="https://www.javascript.com/" target="_blank"><img style="margin: 10px" src="https://profilinator.rishav.dev/skills-assets/javascript-original.svg" alt="JavaScript" height="50" /></a>
<a href="https://www.figma.com/" target="_blank" rel="noreferrer"> <img src="https://www.vectorlogo.zone/logos/figma/figma-icon.svg" alt="figma" width="40" height="40"/> </a>
<a href="https://git-scm.com/" target="_blank" rel="noreferrer"> <img src="https://www.vectorlogo.zone/logos/git-scm/git-scm-icon.svg" alt="git" width="40" height="40"/> </a>
</div>
## Connect with me:
<div align="center">
<a href="https://linkedin.com/in/alex-smagin29" target="_blank">
<img src=https://img.shields.io/badge/linkedin-%231E77B5.svg?&style=for-the-badge&logo=linkedin&logoColor=white alt=linkedin style="margin-bottom: 5px;" />
</a>
<a href="https://github.com/alexandrbig1" target="_blank">
<img src=https://img.shields.io/badge/github-%2324292e.svg?&style=for-the-badge&logo=github&logoColor=white alt=github style="margin-bottom: 5px;" />
</a>
<a href="https://discord.gg/uzM3UNQU" target="_blank">
<img src="https://img.shields.io/badge/discord-%237289DA.svg?&style=for-the-badge&logo=discord&logoColor=white" alt="Discord" style="margin-bottom: 5px;" />
</a>
<a href="https://stackoverflow.com/users/22484161/alex-smagin" target="_blank">
<img src=https://img.shields.io/badge/stackoverflow-%23F28032.svg?&style=for-the-badge&logo=stackoverflow&logoColor=white alt=stackoverflow style="margin-bottom: 5px;" />
</a>
<a href="https://dribbble.com/Alexandrbig1" target="_blank">
<img src=https://img.shields.io/badge/dribbble-%23E45285.svg?&style=for-the-badge&logo=dribbble&logoColor=white alt=dribbble style="margin-bottom: 5px;" />
</a>
<a href="https://www.behance.net/a1126" target="_blank">
<img src=https://img.shields.io/badge/behance-%23191919.svg?&style=for-the-badge&logo=behance&logoColor=white alt=behance style="margin-bottom: 5px;" />
</a>
<a href="https://www.upwork.com/freelancers/~0117da9f9f588056d2" target="_blank">
<img src="https://img.shields.io/badge/upwork-%230077B5.svg?&style=for-the-badge&logo=upwork&logoColor=white&color=%23167B02" alt="Upwork" style="margin-bottom: 5px;" />
</a>
</div>
| WebStudio: Responsive web design project featuring interactive elements, a modern aesthetic, and innovative functionality. Explore the Studio page for strategy insights, team profiles, and customer showcases. Visit the Portfolio page to view animated project cards. Built with HTML, CSS, and JavaScript. | css3,frontend,html-css-javascript,html5,javascript,js,landingpage,responsive-web-design,webdesign,webdevelopment | 2023-08-22T03:27:28Z | 2023-12-30T17:38:08Z | null | 1 | 0 | 29 | 0 | 2 | 7 | null | MIT | HTML |
hafiz1379/react-capstone-project | Develop | <a name="readme-top"></a>
<div align="center">
<br/>
<h3><b>Air Pollution Tracker</b></h3>
</div>
<!-- TABLE OF CONTENTS -->
# 📗 Table of Contents
- [� Table of Contents](#-table-of-contents)
- [📖 Portfolio Desktop Version ](#-portfolio-desktop-version-)
- [🛠 Built With ](#-built-with-)
- [Tech Stack ](#tech-stack-)
- [Key Features ](#key-features-)
- [🚀 Live Demo ](#-live-demo-)
- [💻 Getting Started ](#-getting-started-)
- [Prerequisites](#prerequisites)
- [Setup](#setup)
- [Install](#install)
- [Usage](#usage)
- [Run tests](#run-tests)
- [Deployment](#deployment)
- [👥 Authors ](#-authors-)
- [🔭 Future Features ](#-future-features-)
- [🤝 Contributing ](#-contributing-)
- [⭐️ Show your support ](#️-show-your-support-)
- [🙏 Acknowledgments ](#-acknowledgments-)
- [📝 License ](#-license-)
<!-- PROJECT DESCRIPTION -->
# 📖 Air Pollution Tracker <a name="about-project"></a>
> This Air Pollution Tracker project using HTML, CSS, Tailwind, JavaScript and React.
## 🛠 Built With <a name="built-with"></a>
1- ✅ **HTML**
2- ✅ **CSS**
3- ✅ **JaveScript**
4- ✅ **React**
5- ✅ **Tailwind**
6- ✅ **Webpack**
7- ✅ **Linters**
8- ✅ **Testing**
<!-- - No live demo available yet -->
<p align="right">(<a href="#readme-top">back to top</a>)</p>
### Tech Stack <a name="tech-stack"></a>
## 🚀 Live Demo <a name="live-demo"></a>
- [Live Demo](https://react-capstone-project-g3s8.onrender.com)
- [presentation video](https://www.loom.com/share/0d84ae31d3ad47f182170341cbfdac3c?sid=fd74bc43-e546-4da5-b642-49a75467f572)
>
<details>
<summary>Client</summary>
<ul>
<li><a href="https://html.spec.whatwg.org/multipage//">HTML</a></li>
<li><a href="https://www.w3.org/TR/CSS/#css/">CSS</a></li>
</ul>
</details>
<!-- Features -->
### Key Features <a name="key-features"></a>
- **Real-time Data: Get up-to-date air quality information for all countries, including essential pollutants such as Carbon Monoxide (CO), Nitric Oxide (NO), Nitrogen Dioxide (NO2), Ozone (O3), Sulfur Dioxide (SO2), Fine Particulate Matter (PM2.5), Coarse Particulate Matter (PM10), and Ammonia (NH3).**
- **Responsive Design: Enjoy a seamless user experience on various devices, including smartphones, tablets, and desktops, thanks to the app's responsive design.**
- **Navigate the app effortlessly with an intuitive and user-friendly interface that presents air quality data in a clear and organized manner.**
<p align="right">(<a href="#readme-top">back to top</a>)</p>
<!-- GETTING STARTED -->
## 💻 Getting Started <a name="getting-started"></a>
>
### Prerequisites
In order to run this project you need:
1. Web browser.
2. Code editor.
3. Git-smc.
### Setup
Clone this repository to your desired folder:
Run this command:
```sh
cd my-folder
git clone https://github.com/hafiz1379/react-capstone-project.git
### Install
Install this project with:
Run command:
```sh
cd my-project
npm install
```
<!-- AUTHORS -->
## 👥 Authors <a name="authors"></a>
Hafizullah Rasa
👤 **Hafizullah Rasa**
- GitHub: [@githubhandle](https://github.com/hafiz1379)
- LinkedIn: [LinkedIn](https://www.linkedin.com/in/hafizullah-rasa-8436a1257/)
<p align="right">(<a href="#readme-top">back to top</a>)</p>
<!-- FUTURE FEATURES -->
## 🔭 Future Features <a name="future-features"></a>
- Creating all the remaining sites
- Adding more functionality
<p align="right">(<a href="#readme-top">back to top</a>)</p>
<!-- CONTRIBUTING -->
## 🤝 Contributing <a name="contributing"></a>
Contributions, issues, and feature requests are welcome!
Feel free to check the [issues page](../../issues/).
<p align="right">(<a href="#readme-top">back to top</a>)</p>
<!-- SUPPORT -->
## ⭐️ Show your support <a name="support"></a>
If you like this project just give it a star.
<p align="right">(<a href="#readme-top">back to top</a>)</p>
<!-- ACKNOWLEDGEMENTS -->
## 🙏 Acknowledgments <a name="acknowledgements"></a>
- I would like to thank Microverse for giving me the opportunity to learn and grow as a developer.
- Thanks to [Nelson Sakwa](https://www.behance.net/sakwadesignstudio) the [author of the original design] Under the [Creative Commons License](https://creativecommons.org/licenses/by-nc/4.0/)
<p align="right">(<a href="#readme-top">back to top</a>)</p>
<!-- LICENSE -->
## 📝 License <a name="license"></a>
This project is [MIT](./LICENSE) licensed.
<p align="right">(<a href="#readme-top">back to top</a>)</p> | This application provides current, forecast and historical air pollution data for majority countries. You can check the pollution index of your country by simply scrolling or searching for it using the search bar and clicking on it to show more details. This application is built with React.js and Redux. | api,html,javascript,reactjs,redux,tailwindcss,testing | 2023-09-01T05:21:14Z | 2023-09-05T09:54:58Z | null | 1 | 1 | 50 | 0 | 0 | 7 | null | MIT | JavaScript |
Priyanshu078/google_keep_notes_clone | main | null | This is the google keep notes clone developed using flutter and nodejs. | dart,flutter,googlekeep,googlekeepclone,javascript,mongodb,mongoose,nodejs,notesapp,notes-app | 2023-09-06T17:18:16Z | 2023-12-06T03:04:00Z | null | 1 | 0 | 156 | 0 | 1 | 7 | null | null | Dart |
LSEG/ag-grid-playwright | main | # `ag-grid-playwright`
Test ag-grid using Playwright in a simple, consistent, and extensive way. This library lets you test simple rows and columns or extend it to test ag-grid from playwright in it's entirety.
## Usage
Wrap your React ag-grid with AGGridTestHarness and give it a unique gridId.
```jsx
<AGGridTestHarness gridId="my-grid-id">
<AgGridReact rowData={[...]} columnDefs={[...]} />
</AGGridTestHarness>
```
Your test code has access to rows and columns with one call from ag-grid api or DOM.
```jsx
// from ag-grid api
const agGridApiRows = await page.evaluate(() => window.agGrid.getApiRows('my-grid-id'));
const agGridApiColumns = await page.evaluate(() => window.agGrid.getApiColumns('my-grid-id'));
// from rendered dom
const agGridDomRows = await page.evaluate(() => window.agGrid.getDomRows('my-grid-id'));
const agGridDomColumns = await page.evaluate(() => window.agGrid.getDomColumns('my-grid-id'));
```
# Example Use Cases
- You need a simple way to access the rows and columns of an ag-grid.
- You have an ag-grid with a master detail panel and you need to test the contents of your detail panel is rendered as you expect after expanding a row.
- You want to expand a row group to check the rendered rows.
- You need to do something programmically in the ag-grid api and then test the results of your application.
Read more about the motivation for this plugin [here](#motivation).
## Requirements
- ***React 18*** For now examples are for React 18. However, more examples can be added to cover all the frameworks that ag-grid supports pure JavaScript, Vue, Angular, and Solid.
- ***ag-grid 30*** While this has been tested with ag-grid 18 prior version are likely to be compatiable. Also note this library has a dependency on the internal api of ag-grid
## Installation
```sh
npm install ag-grid-playwright
```
## Example
```jsx
<AGGridTestHarness gridId="my-grid-id">
<AgGridReact
rowData={[
{ make: "Toyota", model: "Celica", price: 35000 },
{ make: "Ford", model: "Mondeo", price: 32000 },
{ make: "Porsche", model: "Boxster", price: 72000 }
]}
columnDefs={[{ field: 'make' },{ field: 'model' },{ field: 'price' }]
} />
</AGGridTestHarness>
```
In your test you can now access the raw grid api rows and columns or via the neatly with getApiRows, getApiColumns, getDomRows, and getDomColumns.
```jsx
import { test, expect } from '@playwright/test';
test.beforeEach(async ({ page }, testInfo) => {
await page.addInitScript({ path: 'node_modules/playwright-ag-grid/aggrid-test-util.js' });
});
test('Test our AGGrids rows and columns match the data we expect', async ({ page }) => {
const expectedRows = [
{ make: "Toyota", model: "Celica", price: 35000 },
{ make: "Ford", model: "Mondeo", price: 32000 },
{ make: "Porsche", model: "Boxster", price: 72000 }
];
const expectedColumns = ['make', 'model', 'price'];
await page.goto('http://mypage.com');
const grid = page.locator('.my-grid-id');
await grid.waitFor();
const agGridApiRows = await page.evaluate(() => window.agGrid.getApiRows('my-grid-id'));
const agGridApiColumns = await page.evaluate(() => window.agGrid.getApiColumns('my-grid-id'));
expect(agGridApiRows).toEqual(expectedRows);
expect(agGridApiColumns).toEqual(expectedColumns);
});
```
## Demo & Further Examples Code / Tests
Run the following to commands in separate consoles in order to start the demo app and run the Playwright tests.
In the **examples** folder run
```js
npm install
npm run dev
```
in the **test** folder run
```js
npm install
npm run tests
```
Check out https://github.com/LSEG/ag-grid-playwright/tree/main/examples for full example app and https://github.com/LSEG/ag-grid-playwright/tree/main/test for full example test.
## How to extend
Cover all of ag-grid capabilities including enterprise version.
```jsx
// In your test code add a custom script
test.beforeEach(async () => {
await page.addInitScript({ path: 'node_modules/playwright-ag-grid/aggrid-test-util.js' });
// add your custom helper
await page.addInitScript({ path: 'playwright-ag-grid/src/custom-ag-grid-test-util.js' });
});
```
In your custom-ag-grid-test-util.js you can now add custom functions with full access to the ag-grid api. Call any method in https://www.ag-grid.com/react-data-grid/grid-api/. NOTE: You must return json.
```jsx
window.agGrid = ['isFirstNodeExpanded'] = (testId) => {
const api = window?.__AG_GRID_TEST__[testId]?.api;
const node = api?.getRowNode(0);
return node.isExpanded;
}
```
In your test you can now call your custom test helper.
```jsx
test('Test using our custom AGGrids helper', async ({ page }) => {
await page.goto('http://mypage.com');
const grid = page.locator('.my-grid-id');
await grid.waitFor();
const isFirstNodeExpanded = await page.evaluate(() => window.agGrid.isFirstNodeExpanded('my-grid-id'));
expect(isFirstNodeExpanded).toEqual(false);
});
```
To debug your custom helpers keep pause page execution with a while statement and set playwright headless config to false
https://playwright.dev/docs/api/class-testoptions#test-options-headless
```jsx
test('Test using our custom AGGrids helper', async ({ page }) => {
await page.goto('http://mypage.com');
const grid = page.locator('.my-grid-id');
await grid.waitFor();
while(true) {}; //add for debugging
const isFirstNodeExpanded = await page.evaluate(() => window.agGrid.isFirstNodeExpanded('my-grid-id'));
expect(isFirstNodeExpanded).toEqual(false);
});
```
You can now debug your helpers fully in Chrome.
## Motivation
### Problem
There currently is not an easy way to test ag-grid extensively with Playwright (or Cypress). You get bogged down with endless class selectors which are bittle and hard to maintain and read.
### Solution
ag-grid-playwright creates a single link between your ag-grid and instance and test code allowing full access to the ag-grid's api in memory as your test code interacts with it. Furthermore, all of the DOM selectors to access the raw DOM elements can be isolated to a single aggrid-test-util.js helper class making it easier to read and maintain.
| A simple way to test ag-grid with Playwright. Extensible enough to cover the all of ag-grid's features. | ag-grid,ag-grid-react,automated-testing,javascript,nodejs,npm,playwright,playwright-javascript,testing,testing-tools | 2023-08-22T09:48:48Z | 2023-10-19T09:22:56Z | null | 2 | 0 | 3 | 0 | 0 | 7 | null | MIT | TypeScript |
the-faizmohammad/Capstone-API-based-webapp | dev | <a name="readme-top"></a>
<div align="center">
<br/>
<h3><b>Metflix-Javascript API based APP</b></h3>
</div>
# 📗 Table of Contents
- [📖 About the Project](#about-project)
- [🛠 Built With](#built-with)
- [Key Features](#key-features)
- [🛠 Tech Stack](#tech-stack)
- [💻 Getting Started](#getting-started)
- [Setup](#setup)
- [Prerequisites](#prerequisites)
- [👥 Authors](#authors)
- [👥 Video walk through](https://drive.google.com/drive/folders/1Z15ctH1xsSom5QCqVZdPDAtR6ziwEdjW?usp=drive_link)
- [🚀Live Demo](https://the-faizmohammad.github.io/Capstone-API-based-webapp/dist/)
- [🔭 Future Features](#future-features)
- [🤝 Contributing](#contributing)
- [⭐️ Show your support](#support)
- [🙏 Acknowledgements](#acknowledgements)
- [❓ FAQ](#faq)
- [📝 License](#license)
## 📖 Description.
Metflix website for displayingMovie List item from tvMaze api. Utilizes Gitflow for version control.In this App user can like and post their comment. The comment made by the user is posted and recored by API and finally gets updated to Metflix App.
## 🛠 Built With <a name="built-with">HTML, CSS and JavaScript</a>
### Tech Stack <a name="tech-stack"></a>
<ul>
<li><a href="https://developer.mozilla.org/ru/docs/Web/HTML">HTML</a></li>
<li><a href="https://developer.mozilla.org/ru/docs/Web/CSS">CSS</a></li>
<li><a href="https://developer.mozilla.org/ru/docs/Web/JavaScript">JavaScript</a></li>
</ul>
### Key Features <a name="key-features">
Some of the key features:
- Set up app using webpack.
- Update the Metflix- Movie API base web apps using an API.(Tvmaze & Involvent API)
- Use of Git Flow
- Linters Setup
-Used Unit Test using Jest for testing Comment & Like counters.
## 💻 Live Demo <a name="Live-Demo"></a>
[🚀 Video walk through](https://drive.google.com/drive/folders/1Z15ctH1xsSom5QCqVZdPDAtR6ziwEdjW?usp=drive_link)
<p align="right">(<a href="#readme-top">back to top</a>)</p>
<p align="right">(<a href="#readme-top">back to top</a>)</p>
## 💻 Live Demo <a name="Live-Demo"></a>
[🚀Live Demo](https://the-faizmohammad.github.io/Capstone-API-based-webapp/dist/)
<p align="right">(<a href="#readme-top">back to top</a>)</p>
## 💻 Getting Started <a name="getting-started"></a>
To get a local copy up and running, follow these steps:
- Open your Terminal in your VSCode.
- Navigate to the desired directory [folder] to which you want to clone the repository to
- [Copy & Paste] the Git clone you find in the code button https://github.com/the-faizmohammad/Capstone-API-based-webapp into your terminal and press [Enter]
- run using "npm start" in your terminal
### Prerequisites
In order to run this project you need:
- General Understanding of HTML, CSS and JavaScript
- basic Knowledge of Git Commands
- basic Knowledge of the Terminal Commands
- basic understanding of gitflow
- understanding Es6 javascript module
- webpack configuration
### Setup
Clone this repository to your desired folder:
- git clone (https://github.com/the-faizmohammad/Capstone-API-based-webapp)
Example commands:
```sh
cd my-folder
git (https://github.com/the-faizmohammad/Capstone-API-based-webapp)
```
### Install
Must-Install-Project-with-the-Following-Programmes:
- Git
- Node.js
- npm install
<p align="right">(<a href="#readme-top">back to top</a>)</p>
## 👥 Contributors <a name="authors"></a>
👤 **Faiz Mohammad**
- GitHub: [@githubhandle](https://github.com/HossainAraf)
- Twitter: [@gmail](email2faizm@gmail.com)
- LinkedIn: [LinkedIn](https://www.linkedin.com/in/faiz-mohammad-967354142/)
👤 **Arafat Hossain**
- GitHub: [@githubhandle](https://github.com/)
- LinkedIn: [LinkedIn](https://www.linkedin.com/in/md-arafat-hossain-111403275/)
## 🔭 Future Features <a name="future-features"></a>
- Adding more styling to CSS
- Adding more functionality to the app
<p align="right">(<a href="#readme-top">back to top</a>)</p>
## 🤝 Contributing <a name="contributing"></a>
Contributions, issues, and feature requests are welcome!
Feel free to check the [issues page](https://github.com/the-faizmohammad/leaderboard-game/issues).
<p align="right">(<a href="#readme-top">back to top</a>)</p>
## ⭐️ Show your support <a name="support"></a>
If you like this project please don't hesitate to support me with your valued contribution and don't forget to star the repo to reach more
people.
<p align="right">(<a href="#readme-top">back to top</a>)</p>
## 🙏 Acknowledgments <a name="acknowledgements"></a>
I would like to thank...
- Microverse code reviewer.
- My Coding Partners & contributors.
- Microverse Community in Slack
<p align="right">(<a href="#readme-top">back to top</a>)</p>
## ❓ FAQ <a name="faq"></a>
Can I clone this project?\*\*
- Yes, but please give star and follow me on github.
Can I contribute to this project?\*\*
- Yes, just create new feature branch.
<p align="right">(<a href="#readme-top">back to top</a>)</p>
## 📝 License <a name="license"></a>
This project is [LICENSED](./LICENSE) licensed.
<p align="right">(<a href="#readme-top">back to top</a>)</p>
| "Explore our JavaScript capstone project! Forge a unique webapp with a favored API. Design 2 interfaces.Features: likable item listing on home page, interactive pop-up for comments ." | api-rest,css,html,javascript,jest-mocking,jest-tests | 2023-08-14T09:56:17Z | 2023-08-31T20:37:42Z | null | 2 | 6 | 116 | 18 | 0 | 7 | null | MIT | JavaScript |
MasumaJaffery/weather-app | dev | <a name="readme-top"></a>
<!--
HOW TO USE:
This is an example of how you may give instructions on setting up your project locally.
Modify this file to match your project and remove sections that don't apply.
REQUIRED SECTIONS:
- Table of Contents
- About the Project
- Built With
- Live Demo
- Getting Started
- Authors
- Future Features
- Contributing
- Show your support
- Acknowledgements
- License
OPTIONAL SECTIONS:
- FAQ
After you're finished please remove all the comments and instructions!
-->
<div align="center">
<!-- You are encouraged to replace this logo with your own! Otherwise you can also remove it. -->
<!-- <img src="" alt="logo" width="140" height="auto" /> -->
<br/>
<h1><b>Iraq Weather Forecast</b></h1>
</div>
<!-- TABLE OF CONTENTS -->
# 📗 Table of Contents
- [📖 About the Project](#about-project)
- [🛠 Built With](#built-with)
- [Tech Stack](#tech-stack)
- [Key Features](#key-features)
- [🚀 Live Demo](#live-demo)
- [💻 Getting Started](#getting-started)
- [Setup](#setup)
- [Prerequisites](#prerequisites)
- [Install](#install)
- [Usage](#usage)
- [Run tests](#run-tests)
- [Deployment](#deployment)
- [👥 Authors](#authors)
- [🔭 Future Features](#future-features)
- [🤝 Contributing](#contributing)
- [⭐️ Show your support](#support)
- [🙏 Acknowledgements](#acknowledgements)
- [❓ FAQ (OPTIONAL)](#faq)
- [📝 License](#license)
<!-- PROJECT DESCRIPTION -->
# 📖 [Iraq Weather Forecast] <a name="about-project"></a>
**[Iraq Weather Forecast]**
## 🛠 Built With <a name="built-with"></a>
### Tech Stack <a name="tech-stack"></a>
HTML+CSS+BOOTSTRAP+REACT+REDUX+GITHUB
<details>
<summary>Technologies</summary>
<ul>
<li><a href="https://html.com/">Html</a></li>
<li><a href="https://www.w3schools.com/css/">CSS</a></li>
<li><a href="https://react.dev/">React</a></li>
<li><a href="https://redux.js.org/">Redux</a></li>
<li><a href="https://github.com/">GitHub</a></li>
<li><a href = "https://getbootstrap.com/">Bootstrap</a></li>
</ul>
</details>
<!-- Features -->
### Key Features <a name="key-features"></a>
- **[User-Interactive]**
- **[Adaptability]**
- **[Performance]**
<p align="right">(<a href="#readme-top">back to top</a>)</p>
<!-- LIVE DEMO -->
## 🚀 Live Demo <a name="live-demo"></a>
- [Live Project Link](https://masumajaffery.github.io/weather-app/)
- [Video Link](https://drive.google.com/file/d/1HX2jWjKnmAOlyV0AQKdSs0knlaVsdL1E/view?usp=sharing)
<p align="right">(<a href="#readme-top">back to top</a>)</p>
<!-- GETTING STARTED -->
## 💻 Getting Started <a name="getting-started"></a>
To get a local copy up and running, follow these steps.
### Prerequisites
In order to run this project you need the following tools:
- Node installed in your computer
- IDE(e.g.: Vscode,...)
- HTML-CSS-BOOTSTRAP-REACT-REDUX-GitHub
- etc.
### Setup
Clone this repository to your desired folder:
<!--
Example commands:
```sh
cd my-folder
git@github.com:MasumaJaffery/weather-app.git
```
--->
### Install
- Install project's packages with:
```sh
cd weather-app
npm install or npm i
```
# Getting Started with Create React App
This project was bootstrapped with [Create React App](https://github.com/facebook/create-react-app).
Run this command in Terminal;
$ npx create-react-app .
## Install Dependencies
Run this command in Terminal;
After cloning the repository you can run `npm install` to get dependencies.
$ npm install redux react-redux redux-logger
$ npm install react-router-dom
for testing;
$ npm install --save-dev jest @babel/preset-env @babel/preset-react react-test-renderer
### Available Scripts
In the project directory, you can run:
### `npm start`
Runs the app in the development mode.\
Open [http://localhost:3000](http://localhost:3000) to view it in your browser.
The page will reload when you make changes.\
You may also see any lint errors in the console.
### `npm test`
Launches the test runner in the interactive watch mode.\
See the section about [running tests](https://facebook.github.io/create-react-app/docs/running-tests) for more information.
### `npm run build`
Builds the app for production to the `build` folder.\
It correctly bundles React in production mode and optimizes the build for the best performance.
The build is minified and the filenames include the hashes.\
Your app is ready to be deployed!
See the section about [deployment](https://facebook.github.io/create-react-app/docs/deployment) for more information.
### `npm run eject`
**Note: this is a one-way operation. Once you `eject`, you can't go back!**
If you aren't satisfied with the build tool and configuration choices, you can `eject` at any time. This command will remove the single build dependency from your project.
Instead, it will copy all the configuration files and the transitive dependencies (webpack, Babel, ESLint, etc) right into your project so you have full control over them. All of the commands except `eject` will still work, but they will point to the copied scripts so you can tweak them. At this point you're on your own.
You don't have to ever use `eject`. The curated feature set is suitable for small and middle deployments, and you shouldn't feel obligated to use this feature. However we understand that this tool wouldn't be useful if you couldn't customize it when you are ready for it.
## Learn More
You can learn more in the [Create React App documentation](https://facebook.github.io/create-react-app/docs/getting-started).
To learn React, check out the [React documentation](https://reactjs.org/).
### Code Splitting
This section has moved here: [https://facebook.github.io/create-react-app/docs/code-splitting](https://facebook.github.io/create-react-app/docs/code-splitting)
### Analyzing the Bundle Size
This section has moved here: [https://facebook.github.io/create-react-app/docs/analyzing-the-bundle-size](https://facebook.github.io/create-react-app/docs/analyzing-the-bundle-size)
### Making a Progressive Web App
This section has moved here: [https://facebook.github.io/create-react-app/docs/making-a-progressive-web-app](https://facebook.github.io/create-react-app/docs/making-a-progressive-web-app)
### Advanced Configuration
This section has moved here: [https://facebook.github.io/create-react-app/docs/advanced-configuration](https://facebook.github.io/create-react-app/docs/advanced-configuration)
### Deployment
This section has moved here: [https://facebook.github.io/create-react-app/docs/deployment](https://facebook.github.io/create-react-app/docs/deployment)
### `npm run build` fails to minify
This section has moved here: [https://facebook.github.io/create-react-app/docs/troubleshooting#npm-run-build-fails-to-minify](https://facebook.github.io/create-react-app/docs/troubleshooting#npm-run-build-fails-to-minify)
### Usage
To run the project, execute the following command:
Open index.html using live server extention.
## Run Tests
To run tests, run the following command:
Track CSS linter errors run:
npx stylelint "**/*.{css,scss}"
Track JavaScript linter errors run:
npx eslint "**/*.{js,jsx}"
## Deployment
You can deploy this project using: GitHub and Netify,
- I used GitHub Pages to deploy my website.
- For more information about publishing sources, see "About GitHub pages".
<p align="right">(<a href="#readme-top">back to top</a>)</p>
<!-- AUTHORS -->
## 👥 Authors <a name="authors"></a>
👤 **Syeda Masuma Fatima**
- GitHub: [@MasumaJaffery](https://github.com/MasumaJaffery)
- Twitter: [@MasumaJaffery](https://twitter.com/MasumaJaffery)
- LinkedIn: [Masuma Jaffery](https://www.linkedin.com/in/masuma-jaffery-797a29256/)
<p align="right">(<a href="#readme-top">back to top</a>)</p>
<!-- FUTURE FEATURES -->
## 🔭 Future Features <a name="future-features"></a>
- [ ] **[Add More Functionality]**
- [ ] **[Add Features]**
<p align="right">(<a href="#readme-top">back to top</a>)</p>
<!-- CONTRIBUTING -->
## 🤝 Contributing <a name="contributing"></a>
Contributions, issues, and feature requests are welcome!
<p align="right">(<a href="#readme-top">back to top</a>)</p>
<!-- SUPPORT -->
## ⭐️ Show your support <a name="support"></a>
If you like this project, I would like to Thank You!
<p align="right">(<a href="#readme-top">back to top</a>)</p>
<!-- ACKNOWLEDGEMENTS -->
## 🙏 Acknowledgments <a name="acknowledgements"></a>
Special Thanks to the Original design idea by Nelson Sakwa on Behance.
<p align="right">(<a href="#readme-top">back to top</a>)</p>
<!-- LICENSE -->
## 📝 License <a name="license"></a>
This project is [MIT](./MIT.md) licensed.
<p align="right">(<a href="#readme-top">back to top</a>)</p>
| The Weather App is based on Iraq Weather Forecast. Fetching Data from open source weather Api and renders on web app. | css3,html5,javascript,react,react-hooks,reactjs,reactrouter,redux,bootstrap | 2023-08-13T12:46:24Z | 2023-08-22T12:45:55Z | null | 1 | 1 | 34 | 0 | 0 | 7 | null | null | JavaScript |
midnqp/nodejs | main | null | Notes on everything Node.js. | design-patterns,javascript,nodejs,notes,typescript | 2023-08-09T11:37:06Z | 2023-12-20T05:40:17Z | null | 1 | 0 | 7 | 0 | 1 | 7 | null | null | null |
jaredwray/fumanchu | main | 
# fumanchu
Handlebars + Helpers Together
[](https://github.com/jaredwray/fumanchu/actions/workflows/tests.yaml)
[](https://codecov.io/gh/jaredwray/fumanchu)
[](https://npmjs.com/package/@jaredwray/fumanchu)
[](https://github.com/jaredwray/fumanchu/blob/master/LICENSE)
[](https://npmjs.com/package/@jaredwray/fumanchu)
[Handlebars](https://github.com/handlebars-lang/handlebars.js) + [Handlebars-helpers](https://github.com/helpers/handlebars-helpers) (helpers are now maintained in this project) combined into a single package. Easily use in your nodejs as it is a drop in replacement when using handlebars directly.
## Table of Contents
* [Using in Nodejs](#using-in-nodejs)
* [Just using Handlebar Helpers](#using-handlebars-helpers)
* [Helpers](#helpers)
* [How to Contribute](#how-to-contribute)
* [License and Copyright](#license-and-copyright)
## Usage Nodejs
```bash
npm install @jaredwray/fumanchu --save
```
```javascript
var handlebars = require('@jaredwray/fumanchu');
var template = handlebars.compile('{{#if (eq foo "bar")}}<p>Foo is bar</p>{{/if}}');
var html = template({foo: 'bar'});
console.log(html);
```
If using it with es6 you can access `handlebars` via destructuring:
```javascript
import handlebars from '@jaredwray/fumanchu';
const template = handlebars.compile('{{#if (eq foo "bar")}}<p>Foo is bar</p>{{/if}}');
const html = template({foo: 'bar'});
console.log(html);
```
It's just that easy! No need to add Handlebars to your project, it's already included.
## Using Handlebars Helpers
If you only want to use handlebar helpers you can easily do that by doing the following:
```javascript
var helpers = require('@jaredwray/fumanchu').handlebarHelpers;
var handlebars = require('handlebars');
helpers({ handlebars: handlebars });
var fn = handlebars.compile('{{add value 5}}');
console.log(fn);
```
If using it with es6 you can access `helpers` via destructuring:
```javascript
import fumanchu from '@jaredwray/fumanchu';
import handlebars from 'handlebars';
const {handlebarHelpers} = fumanchu;
handlebarHelpers({ handlebars: handlebars });
const template = handlebars.compile('{{#if (eq foo "bar")}}<p>Foo is bar</p>{{/if}}');
const html = template({foo: 'bar'});
console.log(html);
```
Notice that in this scenario you are accessing helpers via `helpers` from `fumanchu` instead of just using handlebars via fumanchu directly.
## Helpers
More than 180 Handlebars helpers in ~20 categories. Helpers can be used with Assemble, Generate, Verb, Ghost, gulp-handlebars, grunt-handlebars, consolidate, or any node.js/Handlebars project.
## Categories
Currently **189 helpers** in **20 categories**:
* **[array](#array)** ([code](lib/array.js) | [unit tests](test/array.js))
* **[code](#code)** ([code](lib/code.js) | [unit tests](test/code.js))
* **[collection](#collection)** ([code](lib/collection.js) | [unit tests](test/collection.js))
* **[comparison](#comparison)** ([code](lib/comparison.js) | [unit tests](test/comparison.js))
* **[date](#date)** ([code](lib/date.js) | [unit tests](test/date.js))
* **[fs](#fs)** ([code](lib/fs.js) | [unit tests](test/fs.js))
* **[html](#html)** ([code](lib/html.js) | [unit tests](test/html.js))
* **[i18n](#i18n)** ([code](lib/i18n.js) | [unit tests](test/i18n.js))
* **[inflection](#inflection)** ([code](lib/inflection.js) | [unit tests](test/inflection.js))
* **[logging](#logging)** ([code](lib/logging.js) | [unit tests](test/logging.js))
* **[markdown](#markdown)** ([code](lib/markdown.js) | [unit tests](test/markdown.js))
* **[match](#match)** ([code](lib/match.js) | [unit tests](test/match.js))
* **[math](#math)** ([code](lib/math.js) | [unit tests](test/math.js))
* **[misc](#misc)** ([code](lib/misc.js) | [unit tests](test/misc.js))
* **[number](#number)** ([code](lib/number.js) | [unit tests](test/number.js))
* **[object](#object)** ([code](lib/object.js) | [unit tests](test/object.js))
* **[path](#path)** ([code](lib/path.js) | [unit tests](test/path.js))
* **[regex](#regex)** ([code](lib/regex.js) | [unit tests](test/regex.js))
* **[string](#string)** ([code](lib/string.js) | [unit tests](test/string.js))
* **[url](#url)** ([code](lib/url.js) | [unit tests](test/url.js))
## All helpers
### [array helpers](#array)
Visit the: [code](lib/array.js) | [unit tests](test/array.js) | [issues](https://github.com/jonathas/handlebars-helpers/issues?utf8=%E2%9C%93&q=is%3Aissue+is%3Aopen+array+helpers))
* **[after](#after)** ([code](lib/array.js#L22) | [tests](test/array.js#L13))
* **[arrayify](#arrayify)** ([code](lib/array.js#L39) | [tests](test/array.js#L29))
* **[before](#before)** ([code](lib/array.js#L58) | [tests](test/array.js#L36))
* **[eachIndex](#eachIndex)** ([code](lib/array.js#L77) | [tests](test/array.js#L58))
* **[filter](#filter)** ([code](lib/array.js#L102) | [tests](test/array.js#L91))
* **[first](#first)** ([code](lib/array.js#L142) | [tests](test/array.js#L65))
* **[forEach](#forEach)** ([code](lib/array.js#L184) | [tests](test/array.js#L123))
* **[inArray](#inArray)** ([code](lib/array.js#L224) | [tests](test/array.js#L160))
* **[isArray](#isArray)** ([code](lib/array.js#L244) | [tests](test/array.js#L172))
* **[itemAt](#itemAt)** ([code](lib/array.js#L263) | [tests](test/array.js#L182))
* **[join](#join)** ([code](lib/array.js#L294) | [tests](test/array.js#L225))
* **[equalsLength](#equalsLength)** ([code](lib/array.js#L313) | [tests](test/array.js#L494))
* **[last](#last)** ([code](lib/array.js#L349) | [tests](test/array.js#L240))
* **[length](#length)** ([code](lib/array.js#L379) | [tests](test/array.js#L254))
* **[lengthEqual](#lengthEqual)** ([code](lib/array.js#L395) | [tests](test/array.js#L254))
* **[map](#map)** ([code](lib/array.js#L414) | [tests](test/array.js#L266))
* **[pluck](#pluck)** ([code](lib/array.js#L445) | [tests](test/array.js#L300))
* **[reverse](#reverse)** ([code](lib/array.js#L473) | [tests](test/array.js#L506))
* **[some](#some)** ([code](lib/array.js#L504) | [tests](test/array.js#L308))
* **[sort](#sort)** ([code](lib/array.js#L532) | [tests](test/array.js#L333))
* **[sortBy](#sortBy)** ([code](lib/array.js#L557) | [tests](test/array.js#L358))
* **[withAfter](#withAfter)** ([code](lib/array.js#L588) | [tests](test/array.js#L390))
* **[withBefore](#withBefore)** ([code](lib/array.js#L618) | [tests](test/array.js#L397))
* **[withFirst](#withFirst)** ([code](lib/array.js#L648) | [tests](test/array.js#L404))
* **[withGroup](#withGroup)** ([code](lib/array.js#L692) | [tests](test/array.js#L418))
* **[withLast](#withLast)** ([code](lib/array.js#L727) | [tests](test/array.js#L428))
* **[withSort](#withSort)** ([code](lib/array.js#L766) | [tests](test/array.js#L442))
* **[unique](#unique)** ([code](lib/array.js#L816) | [tests](test/array.js#L483))
### [code helpers](#code)
Visit the: [code](lib/code.js) | [unit tests](test/code.js) | [issues](https://github.com/jonathas/handlebars-helpers/issues?utf8=%E2%9C%93&q=is%3Aissue+is%3Aopen+code+helpers))
* **[embed](#embed)** ([code](lib/code.js#L23) | [tests](test/code.js#L10))
* **[gist](#gist)** ([code](lib/code.js#L45) | [tests](test/code.js#L62))
* **[jsfiddle](#jsfiddle)** ([code](lib/code.js#L60) | [tests](test/code.js#L69))
### [collection helpers](#collection)
Visit the: [code](lib/collection.js) | [unit tests](test/collection.js) | [issues](https://github.com/jonathas/handlebars-helpers/issues?utf8=%E2%9C%93&q=is%3Aissue+is%3Aopen+collection+helpers))
* **[isEmpty](#isEmpty)** ([code](lib/collection.js#L31) | [tests](test/collection.js#L14))
* **[iterate](#iterate)** ([code](lib/collection.js#L59) | [tests](test/collection.js#L68))
### [comparison helpers](#comparison)
Visit the: [code](lib/comparison.js) | [unit tests](test/comparison.js) | [issues](https://github.com/jonathas/handlebars-helpers/issues?utf8=%E2%9C%93&q=is%3Aissue+is%3Aopen+comparison+helpers))
* **[and](#and)** ([code](lib/comparison.js#L27) | [tests](test/comparison.js#L10))
* **[compare](#compare)** ([code](lib/comparison.js#L57) | [tests](test/comparison.js#L41))
* **[contains](#contains)** ([code](lib/comparison.js#L124) | [tests](test/comparison.js#L167))
* **[default](#default)** ([code](lib/comparison.js#L143) | [tests](test/comparison.js#L204))
* **[eq](#eq)** ([code](lib/comparison.js#L165) | [tests](test/comparison.js#L351))
* **[gt](#gt)** ([code](lib/comparison.js#L188) | [tests](test/comparison.js#L214))
* **[gte](#gte)** ([code](lib/comparison.js#L212) | [tests](test/comparison.js#L245))
* **[has](#has)** ([code](lib/comparison.js#L232) | [tests](test/comparison.js#L260))
* **[isFalsey](#isFalsey)** ([code](lib/comparison.js#L274) | [tests](test/comparison.js#L327))
* **[isTruthy](#isTruthy)** ([code](lib/comparison.js#L289) | [tests](test/comparison.js#L339))
* **[ifEven](#ifEven)** ([code](lib/comparison.js#L310) | [tests](test/comparison.js#L368))
* **[ifNth](#ifNth)** ([code](lib/comparison.js#L327) | [tests](test/comparison.js#L380))
* **[ifOdd](#ifOdd)** ([code](lib/comparison.js#L350) | [tests](test/comparison.js#L403))
* **[is](#is)** ([code](lib/comparison.js#L274) | [tests](test/comparison.js#L327))
* **[isnt](#isnt)** ([code](lib/comparison.js#L389) | [tests](test/comparison.js#L432))
* **[lt](#lt)** ([code](lib/comparison.js#L411) | [tests](test/comparison.js#L449))
* **[lte](#lte)** ([code](lib/comparison.js#L435) | [tests](test/comparison.js#L476))
* **[neither](#neither)** ([code](lib/comparison.js#L456) | [tests](test/comparison.js#L511))
* **[not](#not)** ([code](lib/comparison.js#L470) | [tests](test/comparison.js#L624))
* **[or](#or)** ([code](lib/comparison.js#L492) | [tests](test/comparison.js#L523))
* **[unlessEq](#unlessEq)** ([code](lib/comparison.js#L518) | [tests](test/comparison.js#L556))
* **[unlessGt](#unlessGt)** ([code](lib/comparison.js#L538) | [tests](test/comparison.js#L567))
* **[unlessLt](#unlessLt)** ([code](lib/comparison.js#L558) | [tests](test/comparison.js#L578))
* **[unlessGteq](#unlessGteq)** ([code](lib/comparison.js#L578) | [tests](test/comparison.js#L589))
* **[unlessLteq](#unlessLteq)** ([code](lib/comparison.js#L598) | [tests](test/comparison.js#L604))
### [date helpers](#date)
Visit the: [code](lib/date.js) | [unit tests](test/date.js) | [issues](https://github.com/jonathas/handlebars-helpers/issues?utf8=%E2%9C%93&q=is%3Aissue+is%3Aopen+date+helpers))
* **[year](#year)** ([code](lib/date.js#L15) | [no tests])
* **[date](#date)** ([code](lib/date.js#Lundefined) | [no tests])
* **[moment](#moment)** ([code](lib/date.js#L24) | [no tests])
### [fs helpers](#fs)
Visit the: [code](lib/fs.js) | [unit tests](test/fs.js) | [issues](https://github.com/jonathas/handlebars-helpers/issues?utf8=%E2%9C%93&q=is%3Aissue+is%3Aopen+fs+helpers))
* **[fileSize](#fileSize)** ([code](lib/fs.js#L14) | [no tests])
* **[read](#read)** ([code](lib/fs.js#L29) | [tests](test/fs.js#L16))
* **[readdir](#readdir)** ([code](lib/fs.js#L42) | [tests](test/fs.js#L23))
### [html helpers](#html)
Visit the: [code](lib/html.js) | [unit tests](test/html.js) | [issues](https://github.com/jonathas/handlebars-helpers/issues?utf8=%E2%9C%93&q=is%3Aissue+is%3Aopen+html+helpers))
* **[attr](#attr)** ([code](lib/html.js#L23) | [tests](test/html.js#L13))
* **[css](#css)** ([code](lib/html.js#L45) | [tests](test/html.js#L21))
* **[js](#js)** ([code](lib/html.js#L89) | [tests](test/html.js#L69))
* **[sanitize](#sanitize)** ([code](lib/html.js#L121) | [tests](test/html.js#L98))
* **[ul](#ul)** ([code](lib/html.js#L135) | [tests](test/html.js#L108))
* **[ol](#ol)** ([code](lib/html.js#L154) | [tests](test/html.js#L115))
* **[thumbnailImage](#thumbnailImage)** ([code](lib/html.js#L176) | [tests](test/html.js#L122))
### [i18n helpers](#i18n)
Visit the: [code](lib/i18n.js) | [unit tests](test/i18n.js) | [issues](https://github.com/jonathas/handlebars-helpers/issues?utf8=%E2%9C%93&q=is%3Aissue+is%3Aopen+i18n+helpers))
* **[i18n](#i18n)** ([code](lib/i18n.js#L18) | [tests](test/i18n.js#L11))
### [inflection helpers](#inflection)
Visit the: [code](lib/inflection.js) | [unit tests](test/inflection.js) | [issues](https://github.com/jonathas/handlebars-helpers/issues?utf8=%E2%9C%93&q=is%3Aissue+is%3Aopen+inflection+helpers))
* **[inflect](#inflect)** ([code](lib/inflection.js#L30) | [tests](test/inflection.js#L9))
* **[ordinalize](#ordinalize)** ([code](lib/inflection.js#L58) | [tests](test/inflection.js#L22))
### [logging helpers](#logging)
Visit the: [code](lib/logging.js) | [unit tests](test/logging.js) | [issues](https://github.com/jonathas/handlebars-helpers/issues?utf8=%E2%9C%93&q=is%3Aissue+is%3Aopen+logging+helpers))
* **[log](#log)** ([code](lib/logging.js#Lundefined) | [no tests])
* **[ok](#ok)** ([code](lib/logging.js#Lundefined) | [no tests])
* **[success](#success)** ([code](lib/logging.js#Lundefined) | [no tests])
* **[info](#info)** ([code](lib/logging.js#Lundefined) | [no tests])
* **[warning](#warning)** ([code](lib/logging.js#Lundefined) | [no tests])
* **[warn](#warn)** ([code](lib/logging.js#Lundefined) | [no tests])
* **[error](#error)** ([code](lib/logging.js#Lundefined) | [no tests])
* **[danger](#danger)** ([code](lib/logging.js#Lundefined) | [no tests])
* **[bold](#bold)** ([code](lib/logging.js#Lundefined) | [no tests])
* **[_debug](#_debug)** ([code](lib/logging.js#Lundefined) | [no tests])
* **[_inspect](#_inspect)** ([code](lib/logging.js#Lundefined) | [no tests])
### [markdown helpers](#markdown)
* **[markdown](#markdown)** ([code](lib/markdown.js#Lundefined) | [tests](test/markdown.js#L10))
* **[md](#md)** ([code](lib/markdown.js#L55) | [tests](test/markdown.js#L18))
### [match helpers](#match)
Visit the: [code](lib/match.js) | [unit tests](test/match.js) | [issues](https://github.com/jonathas/handlebars-helpers/issues?utf8=%E2%9C%93&q=is%3Aissue+is%3Aopen+match+helpers))
* **[match](#match)** ([code](lib/match.js#L23) | [tests](test/match.js#L13))
* **[isMatch](#isMatch)** ([code](lib/match.js#L47) | [tests](test/match.js#L61))
* **[mm](#mm)** ([code](lib/match.js#L56) | [tests](test/match.js#L67))
### [math helpers](#math)
Visit the: [code](lib/math.js) | [unit tests](test/math.js) | [issues](https://github.com/jonathas/handlebars-helpers/issues?utf8=%E2%9C%93&q=is%3Aissue+is%3Aopen+math+helpers))
* **[abs](#abs)** ([code](lib/math.js#L15) | [test](test/math.js#L149))
* **[add](#add)** ([code](lib/math.js#L31) | [tests](test/math.js#L10))
* **[avg](#avg)** ([code](lib/math.js#L54) | [tests](test/math.js#L25))
* **[ceil](#ceil)** ([code](lib/math.js#L69) | [tests](test/math.js#L29))
* **[divide](#divide)** ([code](lib/math.js#L84) | [tests](test/math.js#L36))
* **[floor](#floor)** ([code](lib/math.js#L102) | [tests](test/math.js#L43))
* **[minus](#minus)** ([code](lib/math.js#L118) | [tests](test/math.js#L169))
* **[modulo](#modulo)** ([code](lib/math.js#L137) | [tests](test/math.js#L191))
* **[multiply](#multiply)** ([code](lib/math.js#L157) | [tests](test/math.js#L50))
* **[plus](#plus)** ([code](lib/math.js#L175) | [tests](test/math.js#L231))
* **[random](#random)** ([code](lib/math.js#L194) | [tests](test/math.js#L102))
* **[remainder](#remainder)** ([code](lib/math.js#L212) | [tests](test/math.js#L57))
* **[round](#round)** ([code](lib/math.js#L224) | [tests](test/math.js#L69))
* **[subtract](#subtract)** ([code](lib/math.js#L241) | [tests](test/math.js#L76))
* **[sum](#sum)** ([code](lib/math.js#L263) | [tests](test/math.js#L83))
* **[times](#times)** ([code](lib/math.js#L286) | [tests](test/math.js#L299))
### [misc helpers](#misc)
Visit the: [code](lib/misc.js) | [unit tests](test/misc.js) | [issues](https://github.com/jonathas/handlebars-helpers/issues?utf8=%E2%9C%93&q=is%3Aissue+is%3Aopen+misc+helpers))
* **[frame](#frame)** ([code](lib/misc.js#L11) | [tests](test/misc.js#L1))
* **[option](#option)** ([code](lib/misc.js#L26) | [tests](test/misc.js#L20))
* **[noop](#noop)** ([code](lib/misc.js#L39) | [tests](test/misc.js#L13))
* **[typeOf](#typeOf)** ([code](lib/misc.js#L59) | [tests](test/misc.js#L38))
* **[withHash](#withHash)** ([code](lib/misc.js#L71) | [tests](test/misc.js#L38))
### [number helpers](#number)
Visit the: [code](lib/number.js) | [unit tests](test/number.js) | [issues](https://github.com/jonathas/handlebars-helpers/issues?utf8=%E2%9C%93&q=is%3Aissue+is%3Aopen+number+helpers))
* **[bytes](#bytes)** ([code](lib/number.js#L24) | [tests](test/number.js#L10))
* **[addCommas](#addCommas)** ([code](lib/number.js#L61) | [tests](test/number.js#L84))
* **[phoneNumber](#phoneNumber)** ([code](lib/number.js#L74) | [tests](test/number.js#L30))
* **[toAbbr](#toAbbr)** ([code](lib/number.js#L92) | [tests](test/number.js#L91))
* **[toExponential](#toExponential)** ([code](lib/number.js#L130) | [tests](test/number.js#L59))
* **[toFixed](#toFixed)** ([code](lib/number.js#L153) | [tests](test/number.js#L37))
* **[toFloat](#toFloat)** ([code](lib/number.js#L169) | [tests](test/number.js#L77))
* **[toInt](#toInt)** ([code](lib/number.js#L179) | [tests](test/number.js#L70))
* **[toPrecision](#toPrecision)** ([code](lib/number.js#L196) | [tests](test/number.js#L48))
### [object helpers](#object)
Visit the: [code](lib/object.js) | [unit tests](test/object.js) | [issues](https://github.com/jonathas/handlebars-helpers/issues?utf8=%E2%9C%93&q=is%3Aissue+is%3Aopen+object+helpers))
* **[extend](#extend)** ([code](lib/object.js#L18) | [tests](test/object.js#L15))
* **[forIn](#forIn)** ([code](lib/object.js#L55) | [tests](test/object.js#L33))
* **[forOwn](#forOwn)** ([code](lib/object.js#L81) | [tests](test/object.js#L50))
* **[toPath](#toPath)** ([code](lib/object.js#L106) | [tests](test/object.js#L87))
* **[get](#get)** ([code](lib/object.js#L128) | [tests](test/object.js#L77))
* **[getObject](#getObject)** ([code](lib/object.js#L149) | [tests](test/object.js#L77))
* **[hasOwn](#hasOwn)** ([code](lib/object.js#L167) | [tests](test/object.js#L126))
* **[isObject](#isObject)** ([code](lib/object.js#L183) | [tests](test/object.js#L144))
* **[JSONparse](#JSONparse)** ([code](lib/object.js#L201) | [tests](test/object.js#L164))
* **[JSONstringify](#JSONstringify)** ([code](lib/object.js#L218) | [no tests])
* **[merge](#merge)** ([code](lib/object.js#L235) | [tests](test/object.js#L156))
* **[parseJSON](#parseJSON)** ([code](lib/object.js#L254) | [no tests])
* **[pick](#pick)** ([code](lib/object.js#L267) | [tests](test/object.js#L171))
* **[stringify](#stringify)** ([code](lib/object.js#L290) | [tests](test/object.js#L199))
### [path helpers](#path)
Visit the: [code](lib/path.js) | [unit tests](test/path.js) | [issues](https://github.com/jonathas/handlebars-helpers/issues?utf8=%E2%9C%93&q=is%3Aissue+is%3Aopen+path+helpers))
* **[absolute](#absolute)** ([code](lib/path.js#L20) | [tests](test/path.js#L13))
* **[dirname](#dirname)** ([code](lib/path.js#L40) | [tests](test/path.js#L25))
* **[relative](#relative)** ([code](lib/path.js#L59) | [tests](test/path.js#L32))
* **[basename](#basename)** ([code](lib/path.js#L81) | [tests](test/path.js#L47))
* **[stem](#stem)** ([code](lib/path.js#L100) | [tests](test/path.js#L58))
* **[extname](#extname)** ([code](lib/path.js#L119) | [tests](test/path.js#L69))
* **[resolve](#resolve)** ([code](lib/path.js#L138) | [tests](test/path.js#L145))
* **[segments](#segments)** ([code](lib/path.js#L166) | [tests](test/path.js#L80))
### [regex helpers](#regex)
Visit the: [code](lib/regex.js) | [unit tests](test/regex.js) | [issues](https://github.com/jonathas/handlebars-helpers/issues?utf8=%E2%9C%93&q=is%3Aissue+is%3Aopen+regex+helpers))
* **[toRegex](#toRegex)** ([code](lib/regex.js#L19) | [tests](test/regex.js#10))
* **[test](#test)** ([code](lib/regex.js#L42) | [tests](test/regex.js#15))
### [string helpers](#string)
Visit the: [code](lib/string.js) | [unit tests](test/string.js) | [issues](https://github.com/jonathas/handlebars-helpers/issues?utf8=%E2%9C%93&q=is%3Aissue+is%3Aopen+string+helpers))
* **[append](#append)** ([code](lib/string.js#L22) | [tests](test/string.js#L9))
* **[camelcase](#camelcase)** ([code](lib/string.js#L41) | [tests](test/string.js#L10))
* **[capitalize](#capitalize)** ([code](lib/string.js#L60) | [tests](test/string.js#L25))
* **[capitalizeAll](#capitalizeAll)** ([code](lib/string.js#L77) | [tests](test/string.js#L36))
* **[center](#center)** ([code](lib/string.js#L95) | [tests](test/string.js#L47))
* **[chop](#chop)** ([code](lib/string.js#L125) | [tests](test/string.js#L58))
* **[dashcase](#dashcase)** ([code](lib/string.js#L143) | [tests](test/string.js#L73))
* **[dotcase](#dotcase)** ([code](lib/string.js#L162) | [tests](test/string.js#L88))
* **[downcase](#downcase)** ([code](lib/string.js#L182) | [tests](test/string.js#L391))
* **[ellipsis](#ellipsis)** ([code](lib/string.js#L202) | [tests](test/string.js#L103))
* **[hyphenate](#hyphenate)** ([code](lib/string.js#L223) | [tests](test/string.js#L118))
* **[isString](#isString)** ([code](lib/string.js#L240) | [tests](test/string.js#L129))
* **[lowercase](#lowercase)** ([code](lib/string.js#L256) | [tests](test/string.js#L151))
* **[occurrences](#occurrences)** ([code](lib/string.js#L278) | [tests](test/string.js#L162))
* **[pascalcase](#pascalcase)** ([code](lib/string.js#L303) | [tests](test/string.js#L173))
* **[pathcase](#pathcase)** ([code](lib/string.js#L323) | [tests](test/string.js#L188))
* **[plusify](#plusify)** ([code](lib/string.js#L343) | [tests](test/string.js#L203))
* **[prepend](#prepend)** ([code](lib/string.js#L363) | [tests](test/string.js#L409))
* **[raw](#raw)** ([code](lib/string.js#L385) | [tests](test/string.js#L465))
* **[remove](#remove)** ([code](lib/string.js#L413) | [tests](test/string.js#L416)
* **[removeFirst](#removeFirst)** ([code](lib/string.js#L432) | [tests](test/string.js#L422))
* **[replace](#replace)** ([code](lib/string.js#L452) | [tests](test/string.js#L222))
* **[replaceFirst](#replaceFirst)** ([code](lib/string.js#L473) | [tests](test/string.js#L428))
* **[reverse](#reverse)** ([code](lib/string.js#L492) | [tests](test/string.js#L241))
* **[sentence](#sentence)** ([code](lib/string.js#L509) | [tests](test/string.js#L252))
* **[snakecase](#snakecase)** ([code](lib/string.js#L528) | [tests](test/string.js#L263))
* **[split](#split)** ([code](lib/string.js#L547) | [tests](test/string.js#L278))
* **[startsWith](#startsWith)** ([code](lib/string.js#L572) | [tests](test/string.js#L293))
* **[titleize](#titleize)** ([code](lib/string.js#L596) | [tests](test/string.js#L312))
* **[trim](#trim)** ([code](lib/string.js#L623) | [tests](test/string.js#L323))
* **[trimLeft](#trimLeft)** ([code](lib/string.js#L639) | [tests](test/string.js#L436))
* **[trimRight](#trimRight)** ([code](lib/string.js#L657) | [tests](test/string.js#L441))
* **[truncate](#truncate)** ([code](lib/string.js#L680) | [tests](test/string.js#L338))
* **[truncateWords](#truncateWords)** ([code](lib/string.js#L712) | [tests](test/string.js#L447)))
* **[upcase](#upcase)** ([code](lib/string.js#L742) | [tests](test/string.js#458))
* **[uppercase](#uppercase)** ([code](lib/string.js#L763) | [tests](test/string.js#L362))
### [url helpers](#url)
Visit the: [code](lib/url.js) | [unit tests](test/url.js) | [issues](https://github.com/jonathas/handlebars-helpers/issues?utf8=%E2%9C%93&q=is%3Aissue+is%3Aopen+url+helpers))
* **[encodeURI](#encodeURI)** ([code](lib/url.js#L19) | [tests](test/url.js#L31))
* **[escape](#escape)** ([code](lib/url.js#L34) | [tests](test/url.js#L81))
* **[decodeURI](#decodeURI)** ([code](lib/url.js#L48) | [tests](test/url.js#L38))
* **[url_encode](#url_encode)** ([code](lib/url.js#L59) | [tests](test/url.js#L89))
* **[url_decode](#url_decode)** ([code](lib/url.js#L68) | [tests](test/url.js#L93))
* **[urlResolve](#urlResolve)** ([code](lib/url.js#L82) | [tests](test/url.js#L11))
* **[urlParse](#urlParse)** ([code](lib/url.js#L94) | [tests](test/url.js#L45))
* **[stripQuerystring](#stripQuerystring)** ([code](lib/url.js#L106) | [tests](test/url.js#L24))
* **[stripProtocol](#stripProtocol)** ([code](lib/url.js#L126) | [tests](test/url.js#L53))
***
## array
### [{{after}}](lib/array.js#L22)
Returns all of the items in an array after the specified index. Opposite of [before](#before).
**Params**
* `array` **{Array}**: Collection
* `n` **{Number}**: Starting index (number of items to exclude)
* `returns` **{Array}**: Array exluding `n` items.
**Example**
```html
<!-- array: ['a', 'b', 'c'] -->
{{after array 1}}
<!-- results in: '["c"]' -->
```
### [{{arrayify}}](lib/array.js#L39)
Cast the given `value` to an array.
**Params**
* `value` **{any}**
* `returns` **{Array}**
**Example**
```html
{{arrayify "foo"}}
<!-- results in: [ "foo" ] -->
```
### [{{before}}](lib/array.js#L58)
Return all of the items in the collection before the specified count. Opposite of [after](#after).
**Params**
* `array` **{Array}**
* `n` **{Number}**
* `returns` **{Array}**: Array excluding items after the given number.
**Example**
```html
<!-- array: ['a', 'b', 'c'] -->
{{before array 2}}
<!-- results in: '["a", "b"]' -->
```
### [{{eachIndex}}](lib/array.js#L77)
**Params**
* `array` **{Array}**
* `options` **{Object}**
* `returns` **{String}**
**Example**
```html
<!-- array: ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h'] -->
{{#eachIndex array}}
{{item}} is {{index}}
{{/eachIndex}}
```
### [{{filter}}](lib/array.js#L102)
Block helper that filters the given array and renders the block for values that evaluate to `true`, otherwise the inverse block is returned.
**Params**
* `array` **{Array}**
* `value` **{any}**
* `options` **{Object}**
* `returns` **{String}**
**Example**
```html
<!-- array: ['a', 'b', 'c'] -->
{{#filter array "foo"}}AAA{{else}}BBB{{/filter}}
<!-- results in: 'BBB' -->
```
### [{{first}}](lib/array.js#L142)
Returns the first item, or first `n` items of an array.
**Params**
* `array` **{Array}**
* `n` **{Number}**: Number of items to return, starting at `0`.
* `returns` **{Array}**
**Example**
```html
{{first "['a', 'b', 'c', 'd', 'e']" 2}}
<!-- results in: '["a", "b"]' -->
```
### [{{forEach}}](lib/array.js#L184)
Iterates over each item in an array and exposes the current item in the array as context to the inner block. In addition to the current array item, the helper exposes the following variables to the inner block:
* `index`
* `total`
* `isFirst`
* `isLast`
Also, `@index` is exposed as a private variable, and additional
private variables may be defined as hash arguments.
**Params**
* `array` **{Array}**
* `returns` **{String}**
**Example**
```html
<!-- accounts = [
{'name': 'John', 'email': 'john@example.com'},
{'name': 'Malcolm', 'email': 'malcolm@example.com'},
{'name': 'David', 'email': 'david@example.com'}
] -->
{{#forEach accounts}}
<a href="mailto:{{ email }}" title="Send an email to {{ name }}">
{{ name }}
</a>{{#unless isLast}}, {{/unless}}
{{/forEach}}
```
### [{{inArray}}](lib/array.js#L224)
Block helper that renders the block if an array has the given `value`. Optionally specify an inverse block to render when the array does not have the given value.
**Params**
* `array` **{Array}**
* `value` **{any}**
* `options` **{Object}**
* `returns` **{String}**
**Example**
```html
<!-- array: ['a', 'b', 'c'] -->
{{#inArray array "d"}}
foo
{{else}}
bar
{{/inArray}}
<!-- results in: 'bar' -->
```
### [{{isArray}}](lib/array.js#L244)
Returns true if `value` is an es5 array.
**Params**
* `value` **{any}**: The value to test.
* `returns` **{Boolean}**
**Example**
```html
{{isArray "abc"}}
<!-- results in: false -->
<!-- array: [1, 2, 3] -->
{{isArray array}}
<!-- results in: true -->
```
### [{{itemAt}}](lib/array.js#L263)
Returns the item from `array` at index `idx`.
**Params**
* `array` **{Array}**
* `idx` **{Number}**
* `returns` **{any}** `value`
**Example**
```html
<!-- array: ['a', 'b', 'c'] -->
{{itemAt array 1}}
<!-- results in: 'b' -->
```
### [{{join}}](lib/array.js#L294)
Join all elements of array into a string, optionally using a given separator.
**Params**
* `array` **{Array}**
* `separator` **{String}**: The separator to use. Defaults to `,`.
* `returns` **{String}**
**Example**
```html
<!-- array: ['a', 'b', 'c'] -->
{{join array}}
<!-- results in: 'a, b, c' -->
{{join array '-'}}
<!-- results in: 'a-b-c' -->
```
### [{{equalsLength}}](lib/array.js#L313)
Returns true if the the length of the given `value` is equal
to the given `length`. Can be used as a block or inline helper.
**Params**
* `value` **{Array|String}**
* `length` **{Number}**
* `options` **{Object}**
* `returns` **{String}**
### [{{last}}](lib/array.js#L349)
Returns the last item, or last `n` items of an array or string. Opposite of [first](#first).
**Params**
* `value` **{Array|String}**: Array or string.
* `n` **{Number}**: Number of items to return from the end of the array.
* `returns` **{Array}**
**Example**
```html
<!-- var value = ['a', 'b', 'c', 'd', 'e'] -->
{{last value}}
<!-- results in: ['e'] -->
{{last value 2}}
<!-- results in: ['d', 'e'] -->
{{last value 3}}
<!-- results in: ['c', 'd', 'e'] -->
```
### [{{length}}](lib/array.js#L379)
Returns the length of the given string or array.
**Params**
* `value` **{Array|Object|String}**
* `returns` **{Number}**: The length of the value.
**Example**
```html
{{length '["a", "b", "c"]'}}
<!-- results in: 3 -->
<!-- results in: myArray = ['a', 'b', 'c', 'd', 'e']; -->
{{length myArray}}
<!-- results in: 5 -->
<!-- results in: myObject = {'a': 'a', 'b': 'b'}; -->
{{length myObject}}
<!-- results in: 2 -->
```
### [{{lengthEqual}}](lib/array.js#L395)
Alias for [equalsLength](#equalsLength)
### [{{map}}](lib/array.js#L414)
Returns a new array, created by calling `function` on each element of the given `array`. For example,
**Params**
* `array` **{Array}**
* `fn` **{Function}**
* `returns` **{String}**
**Example**
```html
<!-- array: ['a', 'b', 'c'], and "double" is a
fictitious function that duplicates letters -->
{{map array double}}
<!-- results in: '["aa", "bb", "cc"]' -->
```
### [{{pluck}}](lib/array.js#L445)
Map over the given object or array or objects and create an array of values from the given `prop`. Dot-notation may be used (as a string) to get nested properties.
**Params**
* `collection` **{Array|Object}**
* `prop` **{Function}**
* `returns` **{String}**
**Example**
```html
// {{pluck items "data.title"}}
<!-- results in: '["aa", "bb", "cc"]' -->
```
### [{{reverse}}](lib/array.js#L473)
Reverse the elements in an array, or the characters in a string.
**Params**
* `value` **{Array|String}**
* `returns` **{Array|String}**: Returns the reversed string or array.
**Example**
```html
<!-- value: 'abcd' -->
{{reverse value}}
<!-- results in: 'dcba' -->
<!-- value: ['a', 'b', 'c', 'd'] -->
{{reverse value}}
<!-- results in: ['d', 'c', 'b', 'a'] -->
```
### [{{some}}](lib/array.js#L504)
Block helper that returns the block if the callback returns true for some value in the given array.
**Params**
* `array` **{Array}**
* `iter` **{Function}**: Iteratee
* **{Options}**: Handlebars provided options object
* `returns` **{String}**
**Example**
```html
<!-- array: [1, 'b', 3] -->
{{#some array isString}}
Render me if the array has a string.
{{else}}
Render me if it doesn't.
{{/some}}
<!-- results in: 'Render me if the array has a string.' -->
```
### [{{sort}}](lib/array.js#L532)
Sort the given `array`. If an array of objects is passed, you may optionally pass a `key` to sort on as the second argument. You may alternatively pass a sorting function as the second argument.
**Params**
* `array` **{Array}**: the array to sort.
* `key` **{String|Function}**: The object key to sort by, or sorting function.
**Example**
```html
<!-- array: ['b', 'a', 'c'] -->
{{sort array}}
<!-- results in: '["a", "b", "c"]' -->
```
### [{{sortBy}}](lib/array.js#L557)
Sort an `array`. If an array of objects is passed, you may optionally pass a `key` to sort on as the second argument. You may alternatively pass a sorting function as the second argument.
**Params**
* `array` **{Array}**: the array to sort.
* `props` **{String|Function}**: One or more properties to sort by, or sorting functions to use.
**Example**
```html
<!-- array: [{a: 'zzz'}, {a: 'aaa'}] -->
{{sortBy array "a"}}
<!-- results in: '[{"a":"aaa"}, {"a":"zzz"}]' -->
```
### [{{withAfter}}](lib/array.js#L588)
Use the items in the array _after_ the specified index as context inside a block. Opposite of [withBefore](#withBefore).
**Params**
* `array` **{Array}**
* `idx` **{Number}**
* `options` **{Object}**
* `returns` **{Array}**
**Example**
```html
<!-- array: ['a', 'b', 'c', 'd', 'e'] -->
{{#withAfter array 3}}
{{this}}
{{/withAfter}}
<!-- results in: "de" -->
```
### [{{withBefore}}](lib/array.js#L618)
Use the items in the array _before_ the specified index as context inside a block. Opposite of [withAfter](#withAfter).
**Params**
* `array` **{Array}**
* `idx` **{Number}**
* `options` **{Object}**
* `returns` **{Array}**
**Example**
```html
<!-- array: ['a', 'b', 'c', 'd', 'e'] -->
{{#withBefore array 3}}
{{this}}
{{/withBefore}}
<!-- results in: 'ab' -->
```
### [{{withFirst}}](lib/array.js#L648)
Use the first item in a collection inside a handlebars block expression. Opposite of [withLast](#withLast).
**Params**
* `array` **{Array}**
* `idx` **{Number}**
* `options` **{Object}**
* `returns` **{String}**
**Example**
```html
<!-- array: ['a', 'b', 'c'] -->
{{#withFirst array}}
{{this}}
{{/withFirst}}
<!-- results in: 'a' -->
```
### [{{withGroup}}](lib/array.js#L692)
Block helper that groups array elements by given group `size`.
**Params**
* `array` **{Array}**: The array to iterate over
* `size` **{Number}**: The desired length of each array "group"
* `options` **{Object}**: Handlebars options
* `returns` **{String}**
**Example**
```html
<!-- array: ['a','b','c','d','e','f','g','h'] -->
{{#withGroup array 4}}
{{#each this}}
{{.}}
{{each}}
<br>
{{/withGroup}}
<!-- results in: -->
<!-- 'a','b','c','d'<br> -->
<!-- 'e','f','g','h'<br> -->
```
### [{{withLast}}](lib/array.js#L727)
Use the last item or `n` items in an array as context inside a block. Opposite of [withFirst](#withFirst).
**Params**
* `array` **{Array}**
* `idx` **{Number}**: The starting index.
* `options` **{Object}**
* `returns` **{String}**
**Example**
```html
<!-- array: ['a', 'b', 'c'] -->
{{#withLast array}}
{{this}}
{{/withLast}}
<!-- results in: 'c' -->
```
### [{{withSort}}](lib/array.js#L766)
Block helper that sorts a collection and exposes the sorted collection as context inside the block.
**Params**
* `array` **{Array}**
* `prop` **{String}**
* `options` **{Object}**: Specify `reverse="true"` to reverse the array.
* `returns` **{String}**
**Example**
```html
<!-- array: ['b', 'a', 'c'] -->
{{#withSort array}}{{this}}{{/withSort}}
<!-- results in: 'abc' -->
```
### [{{unique}}](lib/array.js#L816)
Block helper that return an array with all duplicate values removed. Best used along with a [each](#each) helper.
**Params**
* `array` **{Array}**
* `options` **{Object}**
* `returns` **{Array}**
**Example**
```html
<!-- array: ['a', 'a', 'c', 'b', 'e', 'e'] -->
{{#each (unique array)}}{{.}}{{/each}}
<!-- results in: 'acbe' -->
```
### [{{embed}}](lib/code.js#L23)
Embed code from an external file as preformatted text.
**Params**
* `filepath` **{String}**: filepath to the file to embed.
* `language` **{String}**: Optionally specify the language to use for syntax highlighting.
* `returns` **{String}**
**Example**
```html
{{embed 'path/to/file.js'}}
<!-- optionally specify the language to use -->
{{embed 'path/to/file.hbs' 'html')}}
```
### [{{gist}}](lib/code.js#L45)
Embed a GitHub Gist using only the id of the Gist
**Params**
* `id` **{String}**
* `returns` **{String}**
**Example**
```html
{{gist "12345"}}
```
### [{{jsfiddle}}](lib/code.js#L60)
Generate the HTML for a jsFiddle link with the given `params`
**Params**
* `params` **{Object}**
* `returns` **{String}**
**Example**
```html
{{jsfiddle id="0dfk10ks" tabs="true"}}
```
## collection
### [{{isEmpty}}](lib/collection.js#L31)
Inline, subexpression, or block helper that returns true (or the block) if the given collection is empty, or false (or the inverse block, if supplied) if the colleciton is not empty.
**Params**
* `collection` **{Object}**
* `options` **{Object}**
* `returns` **{String}**
**Example**
```html
<!-- array: [] -->
{{#isEmpty array}}AAA{{else}}BBB{{/isEmpty}}
<!-- results in: 'AAA' -->
<!-- array: [] -->
{{isEmpty array}}
<!-- results in: true -->
```
### [{{iterate}}](lib/collection.js#L59)
Block helper that iterates over an array or object. If
an array is given, `.forEach` is called, or if an object
is given, `.forOwn` is called, otherwise the inverse block
is returned.
**Params**
* `collection` **{Object|Array}**: The collection to iterate over
* `options` **{Object}**
* `returns` **{String}**
## comparison
### [{{and}}](lib/comparison.js#L27)
Helper that renders the block if **both** of the given values are truthy. If an inverse block is specified it will be rendered when falsy. Works as a block helper, inline helper or subexpression.
**Params**
* `a` **{any}**
* `b` **{any}**
* `options` **{Object}**: Handlebars provided options object
* `returns` **{String}**
**Example**
```html
<!-- {great: true, magnificent: true} -->
{{#and great magnificent}}A{{else}}B{{/and}}
<!-- results in: 'A' -->
```
### [{{compare}}](lib/comparison.js#L57)
Render a block when a comparison of the first and third
arguments returns true. The second argument is
the [arithemetic operator](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators) to use. You may also
optionally specify an inverse block to render when falsy.
**Params**
* `a` **{}**
* `operator` **{}**: The operator to use. Operators must be enclosed in quotes: `">"`, `"="`, `"<="`, and so on.
* `b` **{}**
* `options` **{Object}**: Handlebars provided options object
* `returns` **{String}**: Block, or if specified the inverse block is rendered if falsey.
### [{{contains}}](lib/comparison.js#L124)
Block helper that renders the block if `collection` has the given `value`, using strict equality (`===`) for comparison, otherwise the inverse block is rendered (if specified). If a `startIndex` is specified and is negative, it is used as the offset from the end of the collection.
**Params**
* `collection` **{Array|Object|String}**: The collection to iterate over.
* `value` **{any}**: The value to check for.
* `[startIndex=0]` **{Number}**: Optionally define the starting index.
* `options` **{Object}**: Handlebars provided options object.
**Example**
```html
<!-- array = ['a', 'b', 'c'] -->
{{#contains array "d"}}
This will not be rendered.
{{else}}
This will be rendered.
{{/contains}}
```
### [`{{default}}`](lib/comparison.js#L143)
Returns the first value that is not undefined, otherwise the `default` value is returned.
**Params**
* `value` **{any}**
* `defaultValue` **{any}**
* `returns` **{String}**
### [{{eq}}](lib/comparison.js#L165)
Block helper that renders a block if `a` is **equal to** `b`.
If an inverse block is specified it will be rendered when falsy.
You may optionally use the `compare=""` hash argument for the
second value.
**Params**
* `a` **{String}**
* `b` **{String}**
* `options` **{Object}**: Handlebars provided options object
* `returns` **{String}**: Block, or inverse block if specified and falsey.
### [{{gt}}](lib/comparison.js#L188)
Block helper that renders a block if `a` is **greater than** `b`.
If an inverse block is specified it will be rendered when falsy.
You may optionally use the `compare=""` hash argument for the
second value.
**Params**
* `a` **{String}**
* `b` **{String}**
* `options` **{Object}**: Handlebars provided options object
* `returns` **{String}**: Block, or inverse block if specified and falsey.
### [{{gte}}](lib/comparison.js#L212)
Block helper that renders a block if `a` is **greater than or equal to** `b`.
If an inverse block is specified it will be rendered when falsy.
You may optionally use the `compare=""` hash argument for the
second value.
**Params**
* `a` **{String}**
* `b` **{String}**
* `options` **{Object}**: Handlebars provided options object
* `returns` **{String}**: Block, or inverse block if specified and falsey.
### [{{has}}](lib/comparison.js#L232)
Block helper that renders a block if `value` has `pattern`.
If an inverse block is specified it will be rendered when falsy.
**Params**
* `val` **{any}**: The value to check.
* `pattern` **{any}**: The pattern to check for.
* `options` **{Object}**: Handlebars provided options object
* `returns` **{String}**
### [{{isFalsey}}](lib/comparison.js#L274)
Returns true if the given `value` is falsey. Uses the [falsey](https://github.com/jonschlinkert/falsey)
library for comparisons. Please see that library for more information
or to report bugs with this helper.
**Params**
* `val` **{any}**
* `options` **{Options}**
* `returns` **{Boolean}**
### [{{isTruthy}}](lib/comparison.js#L289)
Returns true if the given `value` is truthy. Uses the [falsey](https://github.com/jonschlinkert/falsey)
library for comparisons. Please see that library for more information
or to report bugs with this helper.
**Params**
* `val` **{any}**
* `options` **{Options}**
* `returns` **{Boolean}**
### [{{ifEven}}](lib/comparison.js#L310)
Return true if the given value is an even number.
**Params**
* `number` **{Number}**
* `options` **{Object}**: Handlebars provided options object
* `returns` **{String}**: Block, or inverse block if specified and falsey.
**Example**
```html
{{#ifEven value}}
render A
{{else}}
render B
{{/ifEven}}
```
### [{{ifNth}}](lib/comparison.js#L327)
Conditionally renders a block if the remainder is zero when
`a` operand is divided by `b`. If an inverse block is specified
it will be rendered when the remainder is **not zero**.
**Params**
* **{}**: {Number}
* **{}**: {Number}
* `options` **{Object}**: Handlebars provided options object
* `returns` **{String}**: Block, or inverse block if specified and falsey.
### [{{ifOdd}}](lib/comparison.js#L350)
Block helper that renders a block if `value` is **an odd number**. If an inverse block is specified it will be rendered when falsy.
**Params**
* `value` **{Object}**
* `options` **{Object}**: Handlebars provided options object
* `returns` **{String}**: Block, or inverse block if specified and falsey.
**Example**
```html
{{#ifOdd value}}
render A
{{else}}
render B
{{/ifOdd}}
```
### [`{{is}}`](lib/comparison.js#L367)
Block helper that renders a block if `a` is **equal to** `b`.
If an inverse block is specified it will be rendered when falsy.
Similar to [eq](#eq) but does not do strict equality.
**Params**
* `a` **{any}**
* `b` **{any}**
* `options` **{Object}**: Handlebars provided options object
* `returns` **{String}**
### [`{{isnt}}`](lib/comparison.js#L389)
Block helper that renders a block if `a` is **not equal to** `b`.
If an inverse block is specified it will be rendered when falsy.
Similar to [unlessEq](#unlesseq) but does not use strict equality for
comparisons.
**Params**
* `a` **{String}**
* `b` **{String}**
* `options` **{Object}**: Handlebars provided options object
* `returns` **{String}**
### [`{{lt}}`](lib/comparison.js#L411)
Block helper that renders a block if `a` is **less than** `b`.
If an inverse block is specified it will be rendered when falsy.
You may optionally use the `compare=""` hash argument for the
second value.
**Params**
* `context` **{Object}**
* `options` **{Object}**: Handlebars provided options object
* `returns` **{String}**: Block, or inverse block if specified and falsey.
### [`{{lte}}`](lib/comparison.js#L435)
Block helper that renders a block if `a` is **less than or equal to** `b`.
If an inverse block is specified it will be rendered when falsy.
You may optionally use the `compare=""` hash argument for the
second value.
**Params**
* `a` **{Sring}**
* `b` **{Sring}**
* `options` **{Object}**: Handlebars provided options object
* `returns` **{String}**: Block, or inverse block if specified and falsey.
### [`{{neither}}`](lib/comparison.js#L456)
Block helper that renders a block if **neither of** the given values
are truthy. If an inverse block is specified it will be rendered
when falsy.
**Params**
* `a` **{any}**
* `b` **{any}**
* `options` **{}**: Handlebars options object
* `returns` **{String}**: Block, or inverse block if specified and falsey.
### [`{{not}}`](lib/comparison.js#L470)
Returns true if `val` is falsey. Works as a block or inline helper.
**Params**
* `val` **{String}**
* `options` **{Object}**: Handlebars provided options object
* `returns` **{String}**
### [`{{or}}`](lib/comparison.js#L492)
Block helper that renders a block if **any of** the given values is truthy. If an inverse block is specified it will be rendered when falsy.
**Params**
* `args` **{any}**: Variable number of arguments
* `options` **{Object}**: Handlebars options object
* `returns` **{String}**: Block, or inverse block if specified and falsey.
**Example**
```html
{{#or a b c}}
If any value is true this will be rendered.
{{/or}}
```
### [{{unlessEq}}](lib/comparison.js#L518)
Block helper that always renders the inverse block **unless `a` is
is equal to `b`**.
**Params**
* `a` **{String}**
* `b` **{String}**
* `options` **{Object}**: Handlebars provided options object
* `returns` **{String}**: Inverse block by default, or block if falsey.
### [{{unlessGt}}](lib/comparison.js#L538)
Block helper that always renders the inverse block **unless `a` is
is greater than `b`**.
**Params**
* `a` **{Object}**: The default value
* `b` **{Object}**: The value to compare
* `options` **{Object}**: Handlebars provided options object
* `returns` **{String}**: Inverse block by default, or block if falsey.
### [{{unlessLt}}](lib/comparison.js#L558)
Block helper that always renders the inverse block **unless `a` is
is less than `b`**.
**Params**
* `a` **{Object}**: The default value
* `b` **{Object}**: The value to compare
* `options` **{Object}**: Handlebars provided options object
* `returns` **{String}**: Block, or inverse block if specified and falsey.
### [{{unlessGteq}}](lib/comparison.js#L578)
Block helper that always renders the inverse block **unless `a` is
is greater than or equal to `b`**.
**Params**
* `a` **{any}**
* `b` **{any}**
* `options` **{Object}**: Handlebars provided options object
* `returns` **{String}**: Block, or inverse block if specified and falsey.
### [{{unlessLteq}}](lib/comparison.js#L598)
Block helper that always renders the inverse block **unless `a` is
is less than or equal to `b`**.
**Params**
* `a` **{any}**
* `b` **{any}**
* `options` **{Object}**: Handlebars provided options object
* `returns` **{String}**: Block, or inverse block if specified and falsey.
## date
### [{{year}}](lib/date.js#L15)
Get the current year.
**Example**
```html
{{year}}
<!-- 2017 -->
```
### [{{moment}}](lib/date.js#L24)
Use [moment](http://momentjs.com) as a helper. See [helper-date](https://github.com/helpers/helper-date) for more details.
## fs
### [{{read}}](lib/fs.js#L29)
Read a file from the file system. This is useful in composing "include"-style helpers using sub-expressions.
**Params**
* `filepath` **{String}**
* `returns` **{String}**
**Example**
```html
{{read "a/b/c.js"}}
{{someHelper (read "a/b/c.md")}}
```
### [{{readdir}}](lib/fs.js#L42)
Return an array of files from the given
directory.
**Params**
* `directory` **{String}**
* `returns` **{Array}**
## html
### [{{attr}}](lib/html.js#L23)
Stringify attributes on the options `hash`.
**Params**
* `options` **{Object}**
* `returns` **{String}**
**Example**
```html
<!-- value = 'bar' -->
<div{{attr foo=value}}></div>
<!-- results in: <div foo="bar"></div>
```
### [{{css}}](lib/html.js#L45)
Add an array of `<link>` tags. Automatically resolves relative paths to `options.assets` if passed on the context.
**Params**
* `list` **{String|Array}**: One or more stylesheet urls.
* `returns` **{String}**
**Example**
```html
<!-- {stylesheets: ['foo.css', 'bar.css']} -->
{{css stylesheets}}
<!-- results in: -->
<!-- <link type="text/css" rel="stylesheet" href="foo.css"> -->
<!-- <link type="text/css" rel="stylesheet" href="bar.css"> -->
```
### [{{js}}](lib/html.js#L89)
Generate one or more `<script></script>` tags with paths/urls to javascript or coffeescript files.
**Params**
* `context` **{Object}**
* `returns` **{String}**
**Example**
```html
{{js scripts}}
```
### [{{sanitize}}](lib/html.js#L121)
Strip HTML tags from a string, so that only the text nodes are preserved.
**Params**
* `str` **{String}**: The string of HTML to sanitize.
* `returns` **{String}**
**Example**
```html
{{sanitize "<span>foo</span>"}}
<!-- results in: 'foo' -->
```
### [{{ul}}](lib/html.js#L135)
Block helper for creating unordered lists (`<ul></ul>`)
**Params**
* `context` **{Object}**
* `options` **{Object}**
* `returns` **{String}**
### [{{ol}}](lib/html.js#L154)
Block helper for creating ordered lists (`<ol></ol>`)
**Params**
* `context` **{Object}**
* `options` **{Object}**
* `returns` **{String}**
### [{{thumbnailImage}}](lib/html.js#L176)
Returns a `<figure>` with a thumbnail linked to a full picture
**Params**
* `context` **{Object}**: Object with values/attributes to add to the generated elements:
* `context.alt` **{String}**
* `context.src` **{String}**
* `context.width` **{Number}**
* `context.height` **{Number}**
* `returns` **{String}**: HTML `<figure>` element with image and optional caption/link.
## i18n
### [{{i18n}}](lib/i18n.js#L18)
i18n helper. See [button-i18n](https://github.com/assemble/buttons)
for a working example.
**Params**
* `key` **{String}**
* `options` **{Object}**
* `returns` **{String}**
## inflection
### [{{inflect}}](lib/inflection.js#L30)
Returns either the `singular` or `plural` inflection of a word based on the given `count`.
**Params**
* `count` **{Number}**
* `singular` **{String}**: The singular form
* `plural` **{String}**: The plural form
* `includeCount` **{String}**
* `returns` **{String}**
**Example**
```html
{{inflect 0 "string" "strings"}}
<!-- "strings" -->
{{inflect 1 "string" "strings"}}
<!-- "string" -->
{{inflect 1 "string" "strings" true}}
<!-- "1 string" -->
{{inflect 2 "string" "strings"}}
<!-- "strings" -->
{{inflect 2 "string" "strings" true}}
<!-- "2 strings" -->
```
### [{{ordinalize}}](lib/inflection.js#L58)
Returns an ordinalized number as a string.
**Params**
* `val` **{String}**: The value to ordinalize.
* `returns` **{String}**: The ordinalized number
**Example**
```html
{{ordinalize 1}}
<!-- '1st' -->
{{ordinalize 21}}
<!-- '21st' -->
{{ordinalize 29}}
<!-- '29th' -->
{{ordinalize 22}}
<!-- '22nd' -->
```
## logging
[logging-helpers](https://github.com/jonathas/logging-helpers).
## markdown
### [{{markdown}}](lib/markdown.js#L28)
Block helper that converts a string of inline markdown to HTML.
**Params**
* `context` **{Object}**
* `options` **{Object}**
* `returns` **{String}**
**Example**
```html
{{#markdown}}
# Foo
{{/markdown}}
<!-- results in: <h1>Foo</h1> -->
```
### [{{md}}](lib/markdown.js#L55)
Read a markdown file from the file system and inject its contents after converting it to HTML.
**Params**
* `context` **{Object}**
* `options` **{Object}**
* `returns` **{String}**
**Example**
```html
{{md "foo/bar.md"}}
```
## match
### [{{match}}](lib/match.js#L23)
Returns an array of strings that match the given glob pattern(s). Options may be passed on the options hash or locals.
**Params**
* `files` **{Array|String}**
* `patterns` **{Array|String}**: One or more glob patterns.
* `locals` **{Object}**
* `options` **{Object}**
* `returns` **{Array}**: Array of matches
**Example**
```html
{{match (readdir "foo") "*.js"}}
{{match (readdir "foo") (toRegex "\\.js$")}}
```
### [{{isMatch}}](lib/match.js#L47)
Returns true if a filepath contains the given pattern. Options may be passed on the options hash or locals.
**Params**
* `filepath` **{String}**
* `pattern` **{String}**
* `options` **{Object}**
* `returns` **{Boolean}**
**Example**
```html
{{isMatch "foo.md" "*.md"}}
<!-- results in: true -->
```
## math
### [{{abs}}](lib/math.js#L15)
Return the magnitude of `a`.
**Params**
* `a` **{Number}**
* `returns` **{Number}**
### [{{add}}](lib/math.js#L31)
Return the sum of `a` plus `b`.
**Params**
* `a` **{Number}**
* `b` **{Number}**
* `returns` **{Number}**
### [{{avg}}](lib/math.js#L54)
Returns the average of all numbers in the given array.
**Params**
* `array` **{Array}**: Array of numbers to add up.
* `returns` **{Number}**
**Example**
```html
{{avg "[1, 2, 3, 4, 5]"}}
<!-- results in: '3' -->
```
### [{{ceil}}](lib/math.js#L69)
Get the `Math.ceil()` of the given value.
**Params**
* `value` **{Number}**
* `returns` **{Number}**
### [{{divide}}](lib/math.js#L84)
Divide `a` by `b`
**Params**
* `a` **{Number}**: numerator
* `b` **{Number}**: denominator
### [{{floor}}](lib/math.js#L102)
Get the `Math.floor()` of the given value.
**Params**
* `value` **{Number}**
* `returns` **{Number}**
### [{{minus}}](lib/math.js#L118)
Return the difference of `a` minus `b`.
**Params**
* `a` **{Number}**
* `b` **{Number}**
### [{{modulo}}](lib/math.js#L137)
Get the remainder of a division operation.
**Params**
* `a` **{Number}**
* `b` **{Number}**
* `returns` **{Number}**
### [{{multiply}}](lib/math.js#L157)
Return the product of `a` times `b`.
**Params**
* `a` **{Number}**: factor
* `b` **{Number}**: multiplier
* `returns` **{Number}**
### [{{plus}}](lib/math.js#L175)
Add `a` by `b`.
**Params**
* `a` **{Number}**: factor
* `b` **{Number}**: multiplier
### [{{random}}](lib/math.js#L194)
Generate a random number between two values
**Params**
* `min` **{Number}**
* `max` **{Number}**
* `returns` **{String}**
### [{{remainder}}](lib/math.js#L212)
Get the remainder when `a` is divided by `b`.
**Params**
* `a` **{Number}**: a
* `b` **{Number}**: b
### [{{round}}](lib/math.js#L224)
Round the given number.
**Params**
* `number` **{Number}**
* `returns` **{Number}**
### [{{subtract}}](lib/math.js#L241)
Return the product of `a` minus `b`.
**Params**
* `a` **{Number}**
* `b` **{Number}**
* `returns` **{Number}**
### [{{sum}}](lib/math.js#L263)
Returns the sum of all numbers in the given array.
**Params**
* `array` **{Array}**: Array of numbers to add up.
* `returns` **{Number}**
**Example**
```html
{{sum "[1, 2, 3, 4, 5]"}}
<!-- results in: '15' -->
```
### [{{times}}](lib/math.js#L286)
Multiply number `a` by number `b`.
**Params**
* `a` **{Number}**: factor
* `b` **{Number}**: multiplier
* `returns` **{Number}**
## misc
### [{{option}}](lib/misc.js#L26)
Return the given value of `prop` from `this.options`.
**Params**
* `prop` **{String}**
* `returns` **{any}**
**Example**
```html
<!-- context = {options: {a: {b: {c: 'ddd'}}}} -->
{{option "a.b.c"}}
<!-- results => `ddd` -->
```
### [{{noop}}](lib/misc.js#L39)
Block helper that renders the block without taking any arguments.
**Params**
* `options` **{Object}**
* `returns` **{String}**
### [{{typeOf}}](lib/misc.js#L59)
Get the native type of the given `value`
**Params**
* `value` **{any}**
* `returns` **{String}**: Returns the type of value.
**Example**
```html
{{typeOf 1}}
//=> 'number'
{{typeOf "1"}}
//=> 'string'
{{typeOf "foo"}}
//=> 'string'
```
### [{{withHash}}](lib/misc.js#L71)
Block helper that builds the context for the block
from the options hash.
**Params**
* `options` **{Object}**: Handlebars provided options object.
## number
### [{{bytes}}](lib/number.js#L24)
Format a number to it's equivalent in bytes. If a string is passed, it's length will be formatted and returned.
**Examples:**
* `'foo' => 3 B`
* `13661855 => 13.66 MB`
* `825399 => 825.39 kB`
* `1396 => 1.4 kB`
**Params**
* `number` **{Number|String}**
* `returns` **{String}**
### [{{addCommas}}](lib/number.js#L61)
Add commas to numbers
**Params**
* `num` **{Number}**
* `returns` **{Number}**
### [{{phoneNumber}}](lib/number.js#L74)
Convert a string or number to a formatted phone number.
**Params**
* `num` **{Number|String}**: The phone number to format, e.g. `8005551212`
* `returns` **{Number}**: Formatted phone number: `(800) 555-1212`
### [{{toAbbr}}](lib/number.js#L92)
Abbreviate numbers to the given number of `precision`. This is for
general numbers, not size in bytes.
**Params**
* `number` **{Number}**
* `precision` **{Number}**
* `returns` **{String}**
### [{{toExponential}}](lib/number.js#L130)
Returns a string representing the given number in exponential notation.
**Params**
* `number` **{Number}**
* `fractionDigits` **{Number}**: Optional. An integer specifying the number of digits to use after the decimal point. Defaults to as many digits as necessary to specify the number.
* `returns` **{Number}**
**Example**
```html
{{toExponential number digits}};
```
### [{{toFixed}}](lib/number.js#L153)
Formats the given number using fixed-point notation.
**Params**
* `number` **{Number}**
* `digits` **{Number}**: (Optional) The number of digits to appear after the decimal point; this may be a value between 0 and 20. If this argument is omitted, it is treated as 0.
* `returns` **{String}**: A string representing the given number using fixed-point notation.
**Example**
```html
{{toFixed "1.1234" 2}}
//=> '1.12'
```
### [{{toFloat}}](lib/number.js#L169)
**Params**
* `number` **{Number}**
* `returns` **{Number}**
### [{{toInt}}](lib/number.js#L179)
**Params**
* `number` **{Number}**
* `returns` **{Number}**
### [{{toPrecision}}](lib/number.js#L196)
Returns a string representing the `Number` object to the specified precision.
**Params**
* `number` **{Number}**
* `precision` **{Number}**: (Optional) An integer specifying the number of significant digits. If precison is not between 1 and 100 (inclusive), it will be coerced to `0`.
* `returns` **{String}**: A string representing a Number object in fixed-point or exponential notation rounded to precision significant digits.
**Example**
```html
{{toPrecision "1.1234" 2}}
//=> '1.1'
```
## object
### [{{extend}}](lib/object.js#L18)
Extend the context with the properties of other objects.
A shallow merge is performed to avoid mutating the context.
**Params**
* `objects` **{Object}**: One or more objects to extend.
* `returns` **{Object}**
### [{{forIn}}](lib/object.js#L55)
Block helper that iterates over the properties of
an object, exposing each key and value on the context.
**Params**
* `context` **{Object}**
* `options` **{Object}**
* `returns` **{String}**
### [{{forOwn}}](lib/object.js#L81)
Block helper that iterates over the **own** properties of
an object, exposing each key and value on the context.
**Params**
* `obj` **{Object}**: The object to iterate over.
* `options` **{Object}**
* `returns` **{String}**
### [{{toPath}}](lib/object.js#L106)
Take arguments and, if they are string or number, convert them to a dot-delineated object property path.
**Params**
* `prop` **{String|Number}**: The property segments to assemble (can be multiple).
* `returns` **{String}**
### [{{get}}](lib/object.js#L128)
Use property paths (`a.b.c`) to get a value or nested value from
the context. Works as a regular helper or block helper.
**Params**
* `prop` **{String}**: The property to get, optionally using dot notation for nested properties.
* `context` **{Object}**: The context object
* `options` **{Object}**: The handlebars options object, if used as a block helper.
* `returns` **{String}**
### [{{getObject}}](lib/object.js#L149)
Use property paths (`a.b.c`) to get an object from
the context. Differs from the `get` helper in that this
helper will return the actual object, including the
given property key. Also, this helper does not work as a
block helper.
**Params**
* `prop` **{String}**: The property to get, optionally using dot notation for nested properties.
* `context` **{Object}**: The context object
* `returns` **{String}**
### [{{hasOwn}}](lib/object.js#L167)
Return true if `key` is an own, enumerable property of the given `context` object.
**Params**
* `key` **{String}**
* `context` **{Object}**: The context object.
* `returns` **{Boolean}**
**Example**
```html
{{hasOwn context key}}
```
### [{{isObject}}](lib/object.js#L183)
Return true if `value` is an object.
**Params**
* `value` **{String}**
* `returns` **{Boolean}**
**Example**
```html
{{isObject "foo"}}
//=> false
```
### [{{JSONparse}}](lib/object.js#L201)
Parses the given string using `JSON.parse`.
**Params**
* `string` **{String}**: The string to parse
**Example**
```html
<!-- string: '{"foo": "bar"}' -->
{{JSONparse string}}
<!-- results in: { foo: 'bar' } -->
```
### [{{JSONstringify}}](lib/object.js#L218)
Stringify an object using `JSON.stringify`.
**Params**
* `obj` **{Object}**: Object to stringify
* `returns` **{String}**
**Example**
```html
<!-- object: { foo: 'bar' } -->
{{JSONstringify object}}
<!-- results in: '{"foo": "bar"}' -->
```
### [{{merge}}](lib/object.js#L235)
Deeply merge the properties of the given `objects` with the
context object.
**Params**
* `object` **{Object}**: The target object. Pass an empty object to shallow clone.
* `objects` **{Object}**
* `returns` **{Object}**
### [{{pick}}](lib/object.js#L267)
Pick properties from the context object.
**Params**
* `properties` **{Array|String}**: One or more properties to pick.
* `context` **{Object}**
* `options` **{Object}**: Handlebars options object.
* `returns` **{Object}**: Returns an object with the picked values. If used as a block helper, the values are passed as context to the inner block. If no values are found, the context is passed to the inverse block.
## path
### [{{absolute}}](lib/path.js#L20)
Get the directory path segment from the given `filepath`.
**Params**
* `ext` **{String}**
* `returns` **{String}**
**Example**
```html
{{absolute "docs/toc.md"}}
<!-- results in: 'docs' -->
```
### [{{dirname}}](lib/path.js#L40)
Get the directory path segment from the given `filepath`.
**Params**
* `ext` **{String}**
* `returns` **{String}**
**Example**
```html
{{dirname "docs/toc.md"}}
<!-- results in: 'docs' -->
```
### [{{relative}}](lib/path.js#L59)
Get the relative filepath from `a` to `b`.
**Params**
* `a` **{String}**
* `b` **{String}**
* `returns` **{String}**
**Example**
```html
{{relative a b}}
```
### [{{basename}}](lib/path.js#L81)
Get the file extension from the given `filepath`.
**Params**
* `ext` **{String}**
* `returns` **{String}**
**Example**
```html
{{basename "docs/toc.md"}}
<!-- results in: 'toc.md' -->
```
### [{{stem}}](lib/path.js#L100)
Get the "stem" from the given `filepath`.
**Params**
* `filepath` **{String}**
* `returns` **{String}**
**Example**
```html
{{stem "docs/toc.md"}}
<!-- results in: 'toc' -->
```
### [{{extname}}](lib/path.js#L119)
Get the file extension from the given `filepath`.
**Params**
* `filepath` **{String}**
* `returns` **{String}**
**Example**
```html
{{extname "docs/toc.md"}}
<!-- results in: '.md' -->
```
### [{{resolve}}](lib/path.js#L138)
Resolve an absolute path from the given `filepath`.
**Params**
* `filepath` **{String}**
* `returns` **{String}**
**Example**
```html
{{resolve "docs/toc.md"}}
<!-- results in: '/User/dev/docs/toc.md' -->
```
### [{{segments}}](lib/path.js#L166)
Get specific (joined) segments of a file path by passing a range of array indices.
**Params**
* `filepath` **{String}**: The file path to split into segments.
* `returns` **{String}**: Returns a single, joined file path.
**Example**
```html
{{segments "a/b/c/d" "2" "3"}}
<!-- results in: 'c/d' -->
{{segments "a/b/c/d" "1" "3"}}
<!-- results in: 'b/c/d' -->
{{segments "a/b/c/d" "1" "2"}}
<!-- results in: 'b/c' -->
```
## regex
### [{{toRegex}}](lib/regex.js#L19)
Convert the given string to a regular expression.
**Params**
* `str` **{String}**
* `returns` **{RegExp}**
**Example**
```html
{{toRegex "foo"}}
<!-- results in: /foo/ -->
```
### [{{test}}](lib/regex.js#L42)
Returns true if the given `str` matches the given regex. A regex can be passed on the context, or using the [toRegex](#toregex) helper as a subexpression.
**Params**
* `str` **{String}**
* `returns` **{RegExp}**
**Example**
```html
{{test "bar" (toRegex "foo")}}
<!-- results in: false -->
{{test "foobar" (toRegex "foo")}}
<!-- results in: true -->
{{test "foobar" (toRegex "^foo$")}}
<!-- results in: false -->
```
## string
### [{{append}}](lib/string.js#L22)
Append the specified `suffix` to the given string.
**Params**
* `str` **{String}**
* `suffix` **{String}**
* `returns` **{String}**
**Example**
```html
<!-- given that "item.stem" is "foo" -->
{{append item.stem ".html"}}
<!-- results in: 'foo.html' -->
```
### [{{camelcase}}](lib/string.js#L41)
camelCase the characters in the given `string`.
**Params**
* `string` **{String}**: The string to camelcase.
* `returns` **{String}**
**Example**
```html
{{camelcase "foo bar baz"}};
<!-- results in: 'fooBarBaz' -->
```
### [{{capitalize}}](lib/string.js#L60)
Capitalize the first word in a sentence.
**Params**
* `str` **{String}**
* `returns` **{String}**
**Example**
```html
{{capitalize "foo bar baz"}}
<!-- results in: "Foo bar baz" -->
```
### [{{capitalizeAll}}](lib/string.js#L77)
Capitalize all words in a string.
**Params**
* `str` **{String}**
* `returns` **{String}**
**Example**
```html
{{capitalizeAll "foo bar baz"}}
<!-- results in: "Foo Bar Baz" -->
```
### [{{center}}](lib/string.js#L95)
Center a string using non-breaking spaces
**Params**
* `str` **{String}**
* `spaces` **{String}**
* `returns` **{String}**
### [{{chop}}](lib/string.js#L125)
Like trim, but removes both extraneous whitespace **and non-word characters** from the beginning and end of a string.
**Params**
* `string` **{String}**: The string to chop.
* `returns` **{String}**
**Example**
```html
{{chop "_ABC_"}}
<!-- results in: 'ABC' -->
{{chop "-ABC-"}}
<!-- results in: 'ABC' -->
{{chop " ABC "}}
<!-- results in: 'ABC' -->
```
### [{{dashcase}}](lib/string.js#L143)
dash-case the characters in `string`. Replaces non-word characters and periods with hyphens.
**Params**
* `string` **{String}**
* `returns` **{String}**
**Example**
```html
{{dashcase "a-b-c d_e"}}
<!-- results in: 'a-b-c-d-e' -->
```
### [{{dotcase}}](lib/string.js#L162)
dot.case the characters in `string`.
**Params**
* `string` **{String}**
* `returns` **{String}**
**Example**
```html
{{dotcase "a-b-c d_e"}}
<!-- results in: 'a.b.c.d.e' -->
```
### [{{downcase}}](lib/string.js#L182)
Lowercase all of the characters in the given string. Alias for [lowercase](#lowercase).
**Params**
* `string` **{String}**
* `returns` **{String}**
**Example**
```html
{{downcase "aBcDeF"}}
<!-- results in: 'abcdef' -->
```
### [{{ellipsis}}](lib/string.js#L202)
Truncates a string to the specified `length`, and appends it with an elipsis, `…`.
**Params**
* `str` **{String}**
* `length` **{Number}**: The desired length of the returned string.
* `returns` **{String}**: The truncated string.
**Example**
```html
{{ellipsis (sanitize "<span>foo bar baz</span>"), 7}}
<!-- results in: 'foo bar…' -->
{{ellipsis "foo bar baz", 7}}
<!-- results in: 'foo bar…' -->
```
### [{{hyphenate}}](lib/string.js#L223)
Replace spaces in a string with hyphens.
**Params**
* `str` **{String}**
* `returns` **{String}**
**Example**
```html
{{hyphenate "foo bar baz qux"}}
<!-- results in: "foo-bar-baz-qux" -->
```
### [{{isString}}](lib/string.js#L240)
Return true if `value` is a string.
**Params**
* `value` **{String}**
* `returns` **{Boolean}**
**Example**
```html
{{isString "foo"}}
<!-- results in: 'true' -->
```
### [{{lowercase}}](lib/string.js#L256)
Lowercase all characters in the given string.
**Params**
* `str` **{String}**
* `returns` **{String}**
**Example**
```html
{{lowercase "Foo BAR baZ"}}
<!-- results in: 'foo bar baz' -->
```
### [{{occurrences}}](lib/string.js#L278)
Return the number of occurrences of `substring` within the given `string`.
**Params**
* `str` **{String}**
* `substring` **{String}**
* `returns` **{Number}**: Number of occurrences
**Example**
```html
{{occurrences "foo bar foo bar baz" "foo"}}
<!-- results in: 2 -->
```
### [{{pascalcase}}](lib/string.js#L303)
PascalCase the characters in `string`.
**Params**
* `string` **{String}**
* `returns` **{String}**
**Example**
```html
{{pascalcase "foo bar baz"}}
<!-- results in: 'FooBarBaz' -->
```
### [{{pathcase}}](lib/string.js#L323)
path/case the characters in `string`.
**Params**
* `string` **{String}**
* `returns` **{String}**
**Example**
```html
{{pathcase "a-b-c d_e"}}
<!-- results in: 'a/b/c/d/e' -->
```
### [{{plusify}}](lib/string.js#L343)
Replace spaces in the given string with pluses.
**Params**
* `str` **{String}**: The input string
* `returns` **{String}**: Input string with spaces replaced by plus signs
**Example**
```html
{{plusify "foo bar baz"}}
<!-- results in: 'foo+bar+baz' -->
```
### [{{prepend}}](lib/string.js#L363)
Prepends the given `string` with the specified `prefix`.
**Params**
* `str` **{String}**
* `prefix` **{String}**
* `returns` **{String}**
**Example**
```html
<!-- given that "val" is "bar" -->
{{prepend val "foo-"}}
<!-- results in: 'foo-bar' -->
```
### [{{raw}}](lib/string.js#L385)
Render a block without processing mustache templates inside the block.
**Params**
* `options` **{Object}**
* `returns` **{String}**
**Example**
```html
{{{{#raw}}}}
{{foo}}
{{{{/raw}}}}
<!-- results in: '{{foo}}' -->
```
### [{{remove}}](lib/string.js#L413)
Remove all occurrences of `substring` from the given `str`.
**Params**
* `str` **{String}**
* `substring` **{String}**
* `returns` **{String}**
**Example**
```html
{{remove "a b a b a b" "a "}}
<!-- results in: 'b b b' -->
```
### [{{removeFirst}}](lib/string.js#L432)
Remove the first occurrence of `substring` from the given `str`.
**Params**
* `str` **{String}**
* `substring` **{String}**
* `returns` **{String}**
**Example**
```html
{{remove "a b a b a b" "a"}}
<!-- results in: ' b a b a b' -->
```
### [{{replace}}](lib/string.js#L452)
Replace all occurrences of substring `a` with substring `b`.
**Params**
* `str` **{String}**
* `a` **{String}**
* `b` **{String}**
* `returns` **{String}**
**Example**
```html
{{replace "a b a b a b" "a" "z"}}
<!-- results in: 'z b z b z b' -->
```
### [{{replaceFirst}}](lib/string.js#L473)
Replace the first occurrence of substring `a` with substring `b`.
**Params**
* `str` **{String}**
* `a` **{String}**
* `b` **{String}**
* `returns` **{String}**
**Example**
```html
{{replace "a b a b a b" "a" "z"}}
<!-- results in: 'z b a b a b' -->
```
### [{{reverse}}](lib/string.js#L492)
Reverse a string.
**Params**
* `str` **{String}**
* `returns` **{String}**
**Example**
```html
{{reverse "abcde"}}
<!-- results in: 'edcba' -->
```
### [{{sentence}}](lib/string.js#L509)
Sentence case the given string
**Params**
* `str` **{String}**
* `returns` **{String}**
**Example**
```html
{{sentence "hello world. goodbye world."}}
<!-- results in: 'Hello world. Goodbye world.' -->
```
### [{{snakecase}}](lib/string.js#L528)
snake_case the characters in the given `string`.
**Params**
* `string` **{String}**
* `returns` **{String}**
**Example**
```html
{{snakecase "a-b-c d_e"}}
<!-- results in: 'a_b_c_d_e' -->
```
### [{{split}}](lib/string.js#L547)
Split `string` by the given `character`.
**Params**
* `string` **{String}**: The string to split.
* `returns` **{String}** `character`: Default is an empty string.
**Example**
```html
{{split "a,b,c" ","}}
<!-- results in: ['a', 'b', 'c'] -->
```
### [{{startsWith}}](lib/string.js#L572)
Tests whether a string begins with the given prefix.
**Params**
* `prefix` **{String}**
* `testString` **{String}**
* `options` **{String}**
* `returns` **{String}**
**Example**
```html
{{#startsWith "Goodbye" "Hello, world!"}}
Whoops
{{else}}
Bro, do you even hello world?
{{/startsWith}}
```
### [{{titleize}}](lib/string.js#L596)
Title case the given string.
**Params**
* `str` **{String}**
* `returns` **{String}**
**Example**
```html
{{titleize "this is title case"}}
<!-- results in: 'This Is Title Case' -->
```
### [{{trim}}](lib/string.js#L623)
Removes extraneous whitespace from the beginning and end of a string.
**Params**
* `string` **{String}**: The string to trim.
* `returns` **{String}**
**Example**
```html
{{trim " ABC "}}
<!-- results in: 'ABC' -->
```
### [{{trimLeft}}](lib/string.js#L639)
Removes extraneous whitespace from the beginning of a string.
**Params**
* `string` **{String}**: The string to trim.
* `returns` **{String}**
**Example**
```html
{{trim " ABC "}}
<!-- results in: 'ABC ' -->
```
### [{{trimRight}}](lib/string.js#L657)
Removes extraneous whitespace from the end of a string.
**Params**
* `string` **{String}**: The string to trim.
* `returns` **{String}**
**Example**
```html
{{trimRight " ABC "}}
<!-- results in: ' ABC' -->
```
### [{{truncate}}](lib/string.js#L680)
Truncate a string to the specified `length`. Also see [ellipsis](#ellipsis).
**Params**
* `str` **{String}**
* `limit` **{Number}**: The desired length of the returned string.
* `suffix` **{String}**: Optionally supply a string to use as a suffix to denote when the string has been truncated. Otherwise an ellipsis (`…`) will be used.
* `returns` **{String}**: The truncated string.
**Example**
```html
truncate("foo bar baz", 7);
<!-- results in: 'foo bar' -->
truncate(sanitize("<span>foo bar baz</span>", 7));
<!-- results in: 'foo bar' -->
```
### [{{truncateWords}}](lib/string.js#L712)
Truncate a string to have the specified number of words. Also see [truncate](#truncate).
**Params**
* `str` **{String}**
* `limit` **{Number}**: The desired length of the returned string.
* `suffix` **{String}**: Optionally supply a string to use as a suffix to denote when the string has been truncated.
* `returns` **{String}**: The truncated string.
**Example**
```html
truncateWords("foo bar baz", 1);
<!-- results in: 'foo…' -->
truncateWords("foo bar baz", 2);
<!-- results in: 'foo bar…' -->
truncateWords("foo bar baz", 3);
<!-- results in: 'foo bar baz' -->
```
### [{{upcase}}](lib/string.js#L742)
Uppercase all of the characters in the given string. Alias for [uppercase](#uppercase).
**Params**
* `string` **{String}**
* `returns` **{String}**
**Example**
```html
{{upcase "aBcDeF"}}
<!-- results in: 'ABCDEF' -->
```
### [{{uppercase}}](lib/string.js#L763)
Uppercase all of the characters in the given string. If used as a block helper it will uppercase the entire block. This helper does not support inverse blocks.
**Params**
* `str` **{String}**: The string to uppercase
* `options` **{Object}**: Handlebars options object
* `returns` **{String}**
**Example**
```html
{{uppercase "aBcDeF"}}
<!-- results in: 'ABCDEF' -->
```
## url
### [{{encodeURI}}](lib/url.js#L19)
Encodes a Uniform Resource Identifier (URI) component
by replacing each instance of certain characters by
one, two, three, or four escape sequences representing
the UTF-8 encoding of the character.
**Params**
* `str` **{String}**: The un-encoded string
* `returns` **{String}**: The endcoded string
### [{{escape}}](lib/url.js#L34)
Escape the given string by replacing characters with escape sequences.
Useful for allowing the string to be used in a URL, etc.
**Params**
* `str` **{String}**
* `returns` **{String}**: Escaped string.
### [{{decodeURI}}](lib/url.js#L48)
Decode a Uniform Resource Identifier (URI) component.
**Params**
* `str` **{String}**
* `returns` **{String}**
### [{{url_encode}}](lib/url.js#L59)
Alias for [encodeURI](#encodeuri).
### [{{url_decode}}](lib/url.js#L68)
Alias for [decodeURI](#decodeuri).
### [{{urlResolve}}](lib/url.js#L82)
Take a base URL, and a href URL, and resolve them as a
browser would for an anchor tag.
**Params**
* `base` **{String}**
* `href` **{String}**
* `returns` **{String}**
### [{{urlParse}}](lib/url.js#L94)
Parses a `url` string into an object.
**Params**
* `str` **{String}**: URL string
* `returns` **{String}**: Returns stringified JSON
### [{{stripQuerystring}}](lib/url.js#L106)
Strip the query string from the given `url`.
**Params**
* `url` **{String}**
* `returns` **{String}**: the url without the queryString
### [{{stripProtocol}}](lib/url.js#L126)
Strip protocol from a `url`. Useful for displaying media that may have an 'http' protocol on secure connections.
**Params**
* `str` **{String}**
* `returns` **{String}**: the url with http protocol stripped
**Example**
```html
<!-- url = 'http://foo.bar' -->
{{stripProtocol url}}
<!-- results in: '//foo.bar' -->
```
***
## Utils
The following utils are exposed on `.utils`.
### [{{changecase}}](lib/utils/index.js#L54)
Change casing on the given `string`, optionally passing a delimiter to use between words in the returned string.
**Params**
* `string` **{String}**: The string to change.
* `returns` **{String}**
**Example**
```html
utils.changecase('fooBarBaz');
//=> 'foo bar baz'
utils.changecase('fooBarBaz' '-');
//=> 'foo-bar-baz'
```
### [{{random}}](lib/utils/index.js#L80)
Generate a random number
**Params**
* `min` **{Number}**
* `max` **{Number}**
* `returns` **{Number}**
## How to Contribute
clone the repository locally and run 'npm i' in the root. Now that you've set up your workspace, you're ready to contribute changes to the `fumanchu` repository you can refer to the [CONTRIBUTING](CONTRIBUTING.md) guide. If you have any questions please feel free to ask by creating an issue and label it `question`.
## License and Copyright
[MIT](LICENSE) and codebase after 2023 will be copyright of Jared Wray.
This is a fork of [handlebars-helpers]() which is licensed under MIT. Initial copyright of handlebars-helpers: `2013-2015, 2017, Jon Schlinkert, Brian Woodward`. Thank you so much for your effort and building this! We have also continued to list all contributors in `package.json` to ensure that they are recognized.
| Handlebars + Helpers Together :heart: | handlebars,handlebars-js,helpers,javascript,template-engine,typescript | 2023-08-24T18:35:42Z | 2024-04-25T13:57:40Z | 2024-04-25T13:57:40Z | 2 | 36 | 116 | 1 | 1 | 7 | null | MIT | JavaScript |
envico801/javascript-interview-questions | master | # ✨ Introduction
Greetings, code wanderers! Welcome to this dazzling deck of [JavaScript interview questions](https://github.com/sudheerj/javascript-interview-questions), originally crafted by the coding maestro [Sudheer Jonna](https://twitter.com/SudheerJonna). A round of applause 👏 for Sudheer and [the brilliant minds (contributors)](https://github.com/sudheerj/javascript-interview-questions/graphs/contributors) who've sprinkled their coding magic to improve this repository.
### Anki Adaptation Magic ✨
Behold, the [Anki-adapted version](https://github.com/envico801/javascript-interview-questions)! My goal is to preserve the charm of the original questions while juggling some formatting quirks. *Yes, there might be a bit of indentation errors thanks to a [script I summoned](https://github.com/envico801/obsidian-to-anki-card-converter)*, but fear not 🧙♂️ – the questions retain 100% of their original glory.
### Quest for Perfection 🚀
Some might say perfection is a journey, not a destination. In our case, these questions could be jazzed up for easier learning. Picture this: the first question transformed into a symphony of 2 or 3 sub-questions. Alas, as the harbinger of fresh changes, keeping track of when to split or modify questions is akin to herding caffeinated cats. 🐱
## 💖 Support the Sorcerer/s
Extend your digital love to Sudheer – visit [his GitHub profile](https://github.com/sudheerj) and consider the magic of referral links as you enchantingly subscribe to one of these realms:
* [ZTM - JavaScript Web Projects: 20 Projects to Build Your Portfolio](https://links.zerotomastery.io/jsp_sudheer)
* [Master the Coding Interview: Data Structures + Algorithms](https://links.zerotomastery.io/mci_sudheer2)
* [JavaScript: The Advanced Concepts](https://links.zerotomastery.io/ajs_sudheer)
## 🆘 Need a Spell Breaker?
Seeking refuge from the digital labyrinth, weary traveler? Fear not, for I am your trusty guide through the treacherous terrain of bugs and glitches. However, let us tread cautiously and steer clear of the murky waters of [Ankiweb.net](https://ankiweb.net/) reviews. Instead, arm yourself with the following:
* **[Issue Tracker (Preferred)](https://github.com/envico801/javascript-interview-questions/issues):** The sanctified ground for reporting bugs 🐛 and seeking support. The path less traveled but infinitely more efficient.
* **Carrier Pigeon (Email):** For those who prefer a more personal touch, send a message to [envico801@gmail.com](mailto:envico801@gmail.com?subject=Support%20request%20concerning%20'SJIQ%20-%20Javascript%20interview%20questions%20-%20sudheer%20jonna'&body=Please%20describe%20your%20request%20here%20while%20providing%20as%20many%20details%20as%20possible%20(e.g.%20exact%20instructions%20to%20reproduce%20the%20problem,%20screenshots,%20info%20about%20your%20Anki%20version%20and%20operating%20system,%20etc.)). I promise, the pigeons 🕊️ are well-fed and ready to deliver your digital scrolls.
Feeling chatty? Constructive feedback and suggestions are the secret sauce – sprinkle them generously! 🌟
## 🌟 Usage Tips
In case Anki forgets its styling magic, tap into the mystical powers of [CSS/HTML styles from my repository](https://github.com/envico801/anki-config/tree/main/cards/basic). Your eyes will thank you for the clarity! Pay special attention to the styles for code blocks and tables – those sneaky code blocks tend to lose their indentations, and table borders play hide and seek.
<p align="center">
<a href="https://github.com/envico801/javascript-interview-questions/assets/132226893/5ce13b90-22c6-408a-875a-1ec83ee2d1d2"
target="_blank">
<img src="https://github.com/envico801/javascript-interview-questions/assets/132226893/5ce13b90-22c6-408a-875a-1ec83ee2d1d2"
alt="Card example 3" style="height: 200px;">
</a>
<a href="https://github.com/envico801/javascript-interview-questions/assets/132226893/960ce138-a7dc-4d83-a83a-27adf9684a20"
target="_blank">
<img src="https://github.com/envico801/javascript-interview-questions/assets/132226893/960ce138-a7dc-4d83-a83a-27adf9684a20"
alt="Card example 4" style="height: 200px;">
</a>
<a href="https://github.com/envico801/javascript-interview-questions/assets/132226893/87656a26-6313-45fd-a50b-b4a0822277e6"
target="_blank">
<img src="https://github.com/envico801/javascript-interview-questions/assets/132226893/87656a26-6313-45fd-a50b-b4a0822277e6"
alt="Card example 5" style="height: 200px;">
</a>
</p>
## README.md of the original repository below
---
# JavaScript Interview Questions & Answers
> Click :star:if you like the project and follow [@SudheerJonna](https://twitter.com/SudheerJonna) for more updates. Coding questions available [here](#coding-exercise). PDF and Epub versions available at [actions tab](https://github.com/sudheerj/JavaScript-Interview-Questions/actions).
---
<p align="center">
<a href=https://zerotomastery.io/?utm_source=github&utm_medium=sponsor&utm_campaign=javascript-interview-questions>
<img src=https://process.fs.teachablecdn.com/ADNupMnWyR7kCWRvm76Laz/resize=height:70/https://www.filepicker.io/api/file/AKYtjj5SSGyJuyZrkAB2 alt="ZTM Logo" width="100" height="50">
</a>
<p align="center">
<ol>
<li>Take this <a href=https://links.zerotomastery.io/jsp_sudheer>JavaScript Projects</a> course to go from a JS beginner to confidently building your own projects</li>
<li>Take this <a href=https://links.zerotomastery.io/mci_sudheer2>coding interview bootcamp</a> if you’re serious about getting hired and don’t have a CS degree</li>
<li>Take this <a href=https://links.zerotomastery.io/ajs_sudheer>Advanced JavaScript Course</a> to learn advanced JS concepts and become a top JS developer</li>
</ol>
</p>
</p>
---
**Note:** Please check [DataStructures and Algorithms](https://github.com/sudheerj/datastructures-algorithms) for DSA related questions or problems.
### Table of Contents
| No. | Questions |
| --- | ------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| 1 | [What are the possible ways to create objects in JavaScript](#what-are-the-possible-ways-to-create-objects-in-javascript) |
| 2 | [What is a prototype chain](#what-is-a-prototype-chain) |
| 3 | [What is the difference between Call, Apply and Bind](#what-is-the-difference-between-call-apply-and-bind) |
| 4 | [What is JSON and its common operations](#what-is-json-and-its-common-operations) |
| 5 | [What is the purpose of the array slice method](#what-is-the-purpose-of-the-array-slice-method) |
| 6 | [What is the purpose of the array splice method](#what-is-the-purpose-of-the-array-splice-method) |
| 7 | [What is the difference between slice and splice](#what-is-the-difference-between-slice-and-splice) |
| 8 | [How do you compare an Object with a Map](#how-do-you-compare-object-and-map) |
| 9 | [What is the difference between == and === operators](#what-is-the-difference-between--and--operators) |
| 10 | [What are lambda expression or arrow functions](#what-are-lambda-or-arrow-functions) |
| 11 | [What is a first class function](#what-is-a-first-class-function) |
| 12 | [What is a first order function](#what-is-a-first-order-function) |
| 13 | [What is a higher order function](#what-is-a-higher-order-function) |
| 14 | [What is a unary function](#what-is-a-unary-function) |
| 15 | [What is the currying function](#what-is-the-currying-function) |
| 16 | [What is a pure function](#what-is-a-pure-function) |
| 17 | [What is the purpose of the let keyword](#what-is-the-purpose-of-the-let-keyword) |
| 18 | [What is the difference between let and var](#what-is-the-difference-between-let-and-var) |
| 19 | [What is the reason to choose the name let as a keyword](#what-is-the-reason-to-choose-the-name-let-as-a-keyword) |
| 20 | [How do you redeclare variables in switch block without an error](#how-do-you-redeclare-variables-in-switch-block-without-an-error) |
| 21 | [What is the Temporal Dead Zone](#what-is-the-temporal-dead-zone) |
| 22 | [What is IIFE(Immediately Invoked Function Expression)](#what-is-iifeimmediately-invoked-function-expression) |
| 23 | [How do you decode or encode a URL in JavaScript?](#how-do-you-decode-or-encode-a-url-in-javascript) |
| 24 | [What is memoization](#what-is-memoization) |
| 25 | [What is Hoisting](#what-is-hoisting) |
| 26 | [What are classes in ES6](#what-are-classes-in-es6) |
| 27 | [What are closures](#what-are-closures) |
| 28 | [What are modules](#what-are-modules) |
| 29 | [Why do you need modules](#why-do-you-need-modules) |
| 30 | [What is scope in javascript](#what-is-scope-in-javascript) |
| 31 | [What is a service worker](#what-is-a-service-worker) |
| 32 | [How do you manipulate DOM using a service worker](#how-do-you-manipulate-dom-using-a-service-worker) |
| 33 | [How do you reuse information across service worker restarts](#how-do-you-reuse-information-across-service-worker-restarts) |
| 34 | [What is IndexedDB](#what-is-indexeddb) |
| 35 | [What is web storage](#what-is-web-storage) |
| 36 | [What is a post message](#what-is-a-post-message) |
| 37 | [What is a cookie](#what-is-a-cookie) |
| 38 | [Why do you need a Cookie](#why-do-you-need-a-cookie) |
| 39 | [What are the options in a cookie](#what-are-the-options-in-a-cookie) |
| 40 | [How do you delete a cookie](#how-do-you-delete-a-cookie) |
| 41 | [What are the differences between cookie, local storage and session storage](#What-are-the-differences-between-cookie-local-storage-and-session-storage) |
| 42 | [What is the main difference between localStorage and sessionStorage](#what-is-the-main-difference-between-localstorage-and-sessionstorage) |
| 43 | [How do you access web storage](#how-do-you-access-web-storage) |
| 44 | [What are the methods available on session storage](#what-are-the-methods-available-on-session-storage) |
| 45 | [What is a storage event and its event handler](#what-is-a-storage-event-and-its-event-handler) |
| 46 | [Why do you need web storage](#why-do-you-need-web-storage) |
| 47 | [How do you check web storage browser support](#how-do-you-check-web-storage-browser-support) |
| 48 | [How do you check web workers browser support](#how-do-you-check-web-workers-browser-support) |
| 49 | [Give an example of a web worker](#give-an-example-of-a-web-worker) |
| 50 | [What are the restrictions of web workers on DOM](#what-are-the-restrictions-of-web-workers-on-dom) |
| 51 | [What is a promise](#what-is-a-promise) |
| 52 | [Why do you need a promise](#why-do-you-need-a-promise) |
| 53 | [What are the three states of promise](#what-are-the-three-states-of-promise) |
| 54 | [What is a callback function](#what-is-a-callback-function) |
| 55 | [Why do we need callbacks](#why-do-we-need-callbacks) |
| 56 | [What is a callback hell](#what-is-a-callback-hell) |
| 57 | [What are server-sent events](#what-are-server-sent-events) |
| 58 | [How do you receive server-sent event notifications](#how-do-you-receive-server-sent-event-notifications) |
| 59 | [How do you check browser support for server-sent events](#how-do-you-check-browser-support-for-server-sent-events) |
| 60 | [What are the events available for server sent events](#what-are-the-events-available-for-server-sent-events) |
| 61 | [What are the main rules of promise](#what-are-the-main-rules-of-promise) |
| 62 | [What is callback in callback](#what-is-callback-in-callback) |
| 63 | [What is promise chaining](#what-is-promise-chaining) |
| 64 | [What is promise.all](#what-is-promiseall) |
| 65 | [What is the purpose of the race method in promise](#what-is-the-purpose-of-the-race-method-in-promise) |
| 66 | [What is a strict mode in javascript](#what-is-a-strict-mode-in-javascript) |
| 67 | [Why do you need strict mode](#why-do-you-need-strict-mode) |
| 68 | [How do you declare strict mode](#how-do-you-declare-strict-mode) |
| 69 | [What is the purpose of double exclamation](#what-is-the-purpose-of-double-exclamation) |
| 70 | [What is the purpose of the delete operator](#what-is-the-purpose-of-the-delete-operator) |
| 71 | [What is typeof operator](#what-is-typeof-operator) |
| 72 | [What is undefined property](#what-is-undefined-property) |
| 73 | [What is null value](#what-is-null-value) |
| 74 | [What is the difference between null and undefined](#what-is-the-difference-between-null-and-undefined) |
| 75 | [What is eval](#What-is-eval) |
| 76 | [What is the difference between window and document](#what-is-the-difference-between-window-and-document) |
| 77 | [How do you access history in javascript](#how-do-you-access-history-in-javascript) |
| 78 | [How do you detect caps lock key turned on or not](#how-do-you-detect-caps-lock-key-turned-on-or-not) |
| 79 | [What is isNaN](#what-is-isnan) |
| 80 | [What are the differences between undeclared and undefined variables](#what-are-the-differences-between-undeclared-and-undefined-variables) |
| 81 | [What are global variables](#what-are-global-variables) |
| 82 | [What are the problems with global variables](#what-are-the-problems-with-global-variables) |
| 83 | [What is NaN property](#what-is-nan-property) |
| 84 | [What is the purpose of isFinite function](#what-is-the-purpose-of-isfinite-function) |
| 85 | [What is an event flow](#what-is-an-event-flow) |
| 86 | [What is event bubbling](#what-is-event-bubbling) |
| 87 | [What is event capturing](#what-is-event-capturing) |
| 88 | [How do you submit a form using JavaScript](#how-do-you-submit-a-form-using-javascript) |
| 89 | [How do you find operating system details](#how-do-you-find-operating-system-details) |
| 90 | [What is the difference between document load and DOMContentLoaded events](#what-is-the-difference-between-document-load-and-domcontentloaded-events) |
| 91 | [What is the difference between native, host and user objects](#what-is-the-difference-between-native-host-and-user-objects) |
| 92 | [What are the tools or techniques used for debugging JavaScript code](#what-are-the-tools-or-techniques-used-for-debugging-javascript-code) |
| 93 | [What are the pros and cons of promises over callbacks](#what-are-the-pros-and-cons-of-promises-over-callbacks) |
| 94 | [What is the difference between an attribute and a property](#what-is-the-difference-between-an-attribute-and-a-property) |
| 95 | [What is same-origin policy](#what-is-same-origin-policy) |
| 96 | [What is the purpose of void 0](#what-is-the-purpose-of-void-0) |
| 97 | [Is JavaScript a compiled or interpreted language](#is-javascript-a-compiled-or-interpreted-language) |
| 98 | [Is JavaScript a case-sensitive language](#is-javascript-a-case-sensitive-language) |
| 99 | [Is there any relation between Java and JavaScript](#is-there-any-relation-between-java-and-javascript) |
| 100 | [What are events](#what-are-events) |
| 101 | [Who created javascript](#who-created-javascript) |
| 102 | [What is the use of preventDefault method](#what-is-the-use-of-preventdefault-method) |
| 103 | [What is the use of stopPropagation method](#what-is-the-use-of-stoppropagation-method) |
| 104 | [What are the steps involved in return false usage](#what-are-the-steps-involved-in-return-false-usage) |
| 105 | [What is BOM](#what-is-bom) |
| 106 | [What is the use of setTimeout](#what-is-the-use-of-settimeout) |
| 107 | [What is the use of setInterval](#what-is-the-use-of-setinterval) |
| 108 | [Why is JavaScript treated as Single threaded](#why-is-javascript-treated-as-single-threaded) |
| 109 | [What is an event delegation](#what-is-an-event-delegation) |
| 110 | [What is ECMAScript](#what-is-ecmascript) |
| 111 | [What is JSON](#what-is-json) |
| 112 | [What are the syntax rules of JSON](#what-are-the-syntax-rules-of-json) |
| 113 | [What is the purpose JSON stringify](#what-is-the-purpose-json-stringify) |
| 114 | [How do you parse JSON string](#how-do-you-parse-json-string) |
| 115 | [Why do you need JSON](#why-do-you-need-json) |
| 116 | [What are PWAs](#what-are-pwas) |
| 117 | [What is the purpose of clearTimeout method](#what-is-the-purpose-of-cleartimeout-method) |
| 118 | [What is the purpose of clearInterval method](#what-is-the-purpose-of-clearinterval-method) |
| 119 | [How do you redirect new page in javascript](#how-do-you-redirect-new-page-in-javascript) |
| 120 | [How do you check whether a string contains a substring](#how-do-you-check-whether-a-string-contains-a-substring) |
| 121 | [How do you validate an email in javascript](#how-do-you-validate-an-email-in-javascript) |
| 122 | [How do you get the current url with javascript](#how-do-you-get-the-current-url-with-javascript) |
| 123 | [What are the various url properties of location object](#what-are-the-various-url-properties-of-location-object) |
| 124 | [How do get query string values in javascript](#how-do-get-query-string-values-in-javascript) |
| 125 | [How do you check if a key exists in an object](#how-do-you-check-if-a-key-exists-in-an-object) |
| 126 | [How do you loop through or enumerate javascript object](#how-do-you-loop-through-or-enumerate-javascript-object) |
| 127 | [How do you test for an empty object](#how-do-you-test-for-an-empty-object) |
| 128 | [What is an arguments object](#what-is-an-arguments-object) |
| 129 | [How do you convert the first letter of a string to uppercase](#how-do-you-make-first-letter-of-the-string-in-an-uppercase) |
| 130 | [What are the pros and cons of for loop](#what-are-the-pros-and-cons-of-for-loop) |
| 131 | [How do you display the current date in javascript](#how-do-you-display-the-current-date-in-javascript) |
| 132 | [How do you compare two date objects](#how-do-you-compare-two-date-objects) |
| 133 | [How do you check if a string starts with another string](#how-do-you-check-if-a-string-starts-with-another-string) |
| 134 | [How do you trim a string in javascript](#how-do-you-trim-a-string-in-javascript) |
| 135 | [How do you add a key value pair in javascript](#how-do-you-add-a-key-value-pair-in-javascript) |
| 136 | [Is the '!--' notation represents a special operator](#is-the----notation-represents-a-special-operator) |
| 137 | [How do you assign default values to variables](#how-do-you-assign-default-values-to-variables) |
| 138 | [How do you define multiline strings](#how-do-you-define-multiline-strings) |
| 139 | [What is an app shell model](#what-is-an-app-shell-model) |
| 140 | [Can we define properties for functions](#can-we-define-properties-for-functions) |
| 141 | [What is the way to find the number of parameters expected by a function](#what-is-the-way-to-find-the-number-of-parameters-expected-by-a-function) |
| 142 | [What is a polyfill](#what-is-a-polyfill) |
| 143 | [What are break and continue statements](#what-are-break-and-continue-statements) |
| 144 | [What are js labels](#what-are-js-labels) |
| 145 | [What are the benefits of keeping declarations at the top](#what-are-the-benefits-of-keeping-declarations-at-the-top) |
| 146 | [What are the benefits of initializing variables](#what-are-the-benefits-of-initializing-variables) |
| 147 | [What are the recommendations to create new object](#what-are-the-recommendations-to-create-new-object) |
| 148 | [How do you define JSON arrays](#how-do-you-define-json-arrays) |
| 149 | [How do you generate random integers](#how-do-you-generate-random-integers) |
| 150 | [Can you write a random integers function to print integers with in a range](#can-you-write-a-random-integers-function-to-print-integers-with-in-a-range) |
| 151 | [What is tree shaking](#what-is-tree-shaking) |
| 152 | [What is the need of tree shaking](#what-is-the-need-of-tree-shaking) |
| 153 | [Is it recommended to use eval](#is-it-recommended-to-use-eval) |
| 154 | [What is a Regular Expression](#what-is-a-regular-expression) |
| 155 | [What are the string methods available in Regular expression](#what-are-the-string-methods-available-in-regular-expression) |
| 156 | [What are modifiers in regular expression](#what-are-modifiers-in-regular-expression) |
| 157 | [What are regular expression patterns](#what-are-regular-expression-patterns) |
| 158 | [What is a RegExp object](#what-is-a-regexp-object) |
| 159 | [How do you search a string for a pattern](#how-do-you-search-a-string-for-a-pattern) |
| 160 | [What is the purpose of exec method](#what-is-the-purpose-of-exec-method) |
| 161 | [How do you change the style of a HTML element](#how-do-you-change-the-style-of-a-html-element) |
| 162 | [What would be the result of 1+2+'3'](#what-would-be-the-result-of-123) |
| 163 | [What is a debugger statement](#what-is-a-debugger-statement) |
| 164 | [What is the purpose of breakpoints in debugging](#what-is-the-purpose-of-breakpoints-in-debugging) |
| 165 | [Can I use reserved words as identifiers](#can-i-use-reserved-words-as-identifiers) |
| 166 | [How do you detect a mobile browser](#how-do-you-detect-a-mobile-browser) |
| 167 | [How do you detect a mobile browser without regexp](#how-do-you-detect-a-mobile-browser-without-regexp) |
| 168 | [How do you get the image width and height using JS](#how-do-you-get-the-image-width-and-height-using-js) |
| 169 | [How do you make synchronous HTTP request](#how-do-you-make-synchronous-http-request) |
| 170 | [How do you make asynchronous HTTP request](#how-do-you-make-asynchronous-http-request) |
| 171 | [How do you convert date to another timezone in javascript](#how-do-you-convert-date-to-another-timezone-in-javascript) |
| 172 | [What are the properties used to get size of window](#what-are-the-properties-used-to-get-size-of-window) |
| 173 | [What is a conditional operator in javascript](#what-is-a-conditional-operator-in-javascript) |
| 174 | [Can you apply chaining on conditional operator](#Can-you-apply-chaining-on-conditional-operator) |
| 175 | [What are the ways to execute javascript after page load](#what-are-the-ways-to-execute-javascript-after-page-load) |
| 176 | [What is the difference between proto and prototype](#what-is-the-difference-between-proto-and-prototype) |
| 177 | [Give an example where do you really need semicolon](#give-an-example-where-do-you-really-need-semicolon) |
| 178 | [What is a freeze method](#what-is-a-freeze-method) |
| 179 | [What is the purpose of freeze method](#what-is-the-purpose-of-freeze-method) |
| 180 | [Why do I need to use freeze method](#why-do-i-need-to-use-freeze-method) |
| 181 | [How do you detect a browser language preference](#how-do-you-detect-a-browser-language-preference) |
| 182 | [How to convert string to title case with javascript](#how-to-convert-string-to-title-case-with-javascript) |
| 183 | [How do you detect javascript disabled in the page](#how-do-you-detect-javascript-disabled-in-the-page) |
| 184 | [What are various operators supported by javascript](#what-are-various-operators-supported-by-javascript) |
| 185 | [What is a rest parameter](#what-is-a-rest-parameter) |
| 186 | [What happens if you do not use rest parameter as a last argument](#what-happens-if-you-do-not-use-rest-parameter-as-a-last-argument) |
| 187 | [What are the bitwise operators available in javascript](#what-are-the-bitwise-operators-available-in-javascript) |
| 188 | [What is a spread operator](#what-is-a-spread-operator) |
| 189 | [How do you determine whether object is frozen or not](#how-do-you-determine-whether-object-is-frozen-or-not) |
| 190 | [How do you determine two values same or not using object](#how-do-you-determine-two-values-same-or-not-using-object) |
| 191 | [What is the purpose of using object is method](#what-is-the-purpose-of-using-object-is-method) |
| 192 | [How do you copy properties from one object to other](#how-do-you-copy-properties-from-one-object-to-other) |
| 193 | [What are the applications of assign method](#what-are-the-applications-of-assign-method) |
| 194 | [What is a proxy object](#what-is-a-proxy-object) |
| 195 | [What is the purpose of seal method](#what-is-the-purpose-of-seal-method) |
| 196 | [What are the applications of seal method](#what-are-the-applications-of-seal-method) |
| 197 | [What are the differences between freeze and seal methods](#what-are-the-differences-between-freeze-and-seal-methods) |
| 198 | [How do you determine if an object is sealed or not](#how-do-you-determine-if-an-object-is-sealed-or-not) |
| 199 | [How do you get enumerable key and value pairs](#how-do-you-get-enumerable-key-and-value-pairs) |
| 200 | [What is the main difference between Object.values and Object.entries method](#what-is-the-main-difference-between-objectvalues-and-objectentries-method) |
| 201 | [How can you get the list of keys of any object](#how-can-you-get-the-list-of-keys-of-any-object) |
| 202 | [How do you create an object with prototype](#how-do-you-create-an-object-with-prototype) |
| 203 | [What is a WeakSet](#what-is-a-weakset) |
| 204 | [What are the differences between a WeakSet and a Set](#what-are-the-differences-between-weakset-and-set) |
| 205 | [List down the collection of methods available on WeakSet](#list-down-the-collection-of-methods-available-on-weakset) |
| 206 | [What is a WeakMap](#what-is-a-weakmap) |
| 207 | [What are the differences between a WeakMap and a Map](#what-are-the-differences-between-weakmap-and-map) |
| 208 | [List down the collection of methods available on WeakMap](#list-down-the-collection-of-methods-available-on-weakmap) |
| 209 | [What is the purpose of uneval](#what-is-the-purpose-of-uneval) |
| 210 | [How do you encode an URL](#how-do-you-encode-an-url) |
| 211 | [How do you decode an URL](#how-do-you-decode-an-url) |
| 212 | [How do you print the contents of web page](#how-do-you-print-the-contents-of-web-page) |
| 213 | [What is the difference between uneval and eval](#what-is-the-difference-between-uneval-and-eval) |
| 214 | [What is an anonymous function](#what-is-an-anonymous-function) |
| 215 | [What is the precedence order between local and global variables](#what-is-the-precedence-order-between-local-and-global-variables) |
| 216 | [What are javascript accessors](#what-are-javascript-accessors) |
| 217 | [How do you define property on Object constructor](#how-do-you-define-property-on-object-constructor) |
| 218 | [What is the difference between get and defineProperty](#what-is-the-difference-between-get-and-defineproperty) |
| 219 | [What are the advantages of Getters and Setters](#what-are-the-advantages-of-getters-and-setters) |
| 220 | [Can I add getters and setters using defineProperty method](#can-i-add-getters-and-setters-using-defineproperty-method) |
| 221 | [What is the purpose of switch-case](#what-is-the-purpose-of-switch-case) |
| 222 | [What are the conventions to be followed for the usage of switch case](#what-are-the-conventions-to-be-followed-for-the-usage-of-switch-case) |
| 223 | [What are primitive data types](#what-are-primitive-data-types) |
| 224 | [What are the different ways to access object properties](#what-are-the-different-ways-to-access-object-properties) |
| 225 | [What are the function parameter rules](#what-are-the-function-parameter-rules) |
| 226 | [What is an error object](#what-is-an-error-object) |
| 227 | [When you get a syntax error](#when-you-get-a-syntax-error) |
| 228 | [What are the different error names from error object](#what-are-the-different-error-names-from-error-object) |
| 229 | [What are the various statements in error handling](#what-are-the-various-statements-in-error-handling) |
| 230 | [What are the two types of loops in javascript](#what-are-the-two-types-of-loops-in-javascript) |
| 231 | [What is nodejs](#what-is-nodejs) |
| 232 | [What is an Intl object](#what-is-an-intl-object) |
| 233 | [How do you perform language specific date and time formatting](#how-do-you-perform-language-specific-date-and-time-formatting) |
| 234 | [What is an Iterator](#what-is-an-iterator) |
| 235 | [How does the synchronous iteration work](#how-does-synchronous-iteration-works) |
| 236 | [What is an event loop](#what-is-an-event-loop) |
| 237 | [What is call stack](#what-is-call-stack) |
| 238 | [What is an event queue](#what-is-an-event-queue) |
| 239 | [What is a decorator](#what-is-a-decorator) |
| 240 | [What are the properties of Intl object](#what-are-the-properties-of-intl-object) |
| 241 | [What is an Unary operator](#what-is-an-unary-operator) |
| 242 | [How do you sort elements in an array](#how-do-you-sort-elements-in-an-array) |
| 243 | [What is the purpose of compareFunction while sorting arrays](#what-is-the-purpose-of-comparefunction-while-sorting-arrays) |
| 244 | [How do you reversing an array](#how-do-you-reversing-an-array) |
| 245 | [How do you find min and max value in an array](#how-do-you-find-min-and-max-value-in-an-array) |
| 246 | [How do you find min and max values without Math functions](#how-do-you-find-min-and-max-values-without-math-functions) |
| 247 | [What is an empty statement and purpose of it](#what-is-an-empty-statement-and-purpose-of-it) |
| 248 | [How do you get metadata of a module](#how-do-you-get-metadata-of-a-module) |
| 249 | [What is a comma operator](#what-is-a-comma-operator) |
| 250 | [What is the advantage of a comma operator](#what-is-the-advantage-of-a-comma-operator) |
| 251 | [What is typescript](#what-is-typescript) |
| 252 | [What are the differences between javascript and typescript](#what-are-the-differences-between-javascript-and-typescript) |
| 253 | [What are the advantages of typescript over javascript](#what-are-the-advantages-of-typescript-over-javascript) |
| 254 | [What is an object initializer](#what-is-an-object-initializer) |
| 255 | [What is a constructor method](#what-is-a-constructor-method) |
| 256 | [What happens if you write constructor more than once in a class](#what-happens-if-you-write-constructor-more-than-once-in-a-class) |
| 257 | [How do you call the constructor of a parent class](#how-do-you-call-the-constructor-of-a-parent-class) |
| 258 | [How do you get the prototype of an object](#how-do-you-get-the-prototype-of-an-object) |
| 259 | [What happens If I pass string type for getPrototype method](#what-happens-if-i-pass-string-type-for-getprototype-method) |
| 260 | [How do you set prototype of one object to another](#how-do-you-set-prototype-of-one-object-to-another) |
| 261 | [How do you check whether an object can be extendable or not](#how-do-you-check-whether-an-object-can-be-extendable-or-not) |
| 262 | [How do you prevent an object to extend](#how-do-you-prevent-an-object-to-extend) |
| 263 | [What are the different ways to make an object non-extensible](#what-are-the-different-ways-to-make-an-object-non-extensible) |
| 264 | [How do you define multiple properties on an object](#how-do-you-define-multiple-properties-on-an-object) |
| 265 | [What is MEAN in javascript](#what-is-mean-in-javascript) |
| 266 | [What Is Obfuscation in javascript](#what-is-obfuscation-in-javascript) |
| 267 | [Why do you need Obfuscation](#why-do-you-need-obfuscation) |
| 268 | [What is Minification](#what-is-minification) |
| 269 | [What are the advantages of minification](#what-are-the-advantages-of-minification) |
| 270 | [What are the differences between Obfuscation and Encryption](#what-are-the-differences-between-obfuscation-and-encryption) |
| 271 | [What are the common tools used for minification](#what-are-the-common-tools-used-for-minification) |
| 272 | [How do you perform form validation using javascript](#how-do-you-perform-form-validation-using-javascript) |
| 273 | [How do you perform form validation without javascript](#how-do-you-perform-form-validation-without-javascript) |
| 274 | [What are the DOM methods available for constraint validation](#what-are-the-dom-methods-available-for-constraint-validation) |
| 275 | [What are the available constraint validation DOM properties](#what-are-the-available-constraint-validation-dom-properties) |
| 276 | [What are the list of validity properties](#what-are-the-list-of-validity-properties) |
| 277 | [Give an example usage of rangeOverflow property](#give-an-example-usage-of-rangeoverflow-property) |
| 278 | [Is enums feature available in javascript](#is-enums-feature-available-in-javascript) |
| 279 | [What is an enum](#What-is-an-enum) |
| 280 | [How do you list all properties of an object](#how-do-you-list-all-properties-of-an-object) |
| 281 | [How do you get property descriptors of an object](#how-do-you-get-property-descriptors-of-an-object) |
| 282 | [What are the attributes provided by a property descriptor](#what-are-the-attributes-provided-by-a-property-descriptor) |
| 283 | [How do you extend classes](#how-do-you-extend-classes) |
| 284 | [How do I modify the url without reloading the page](#how-do-i-modify-the-url-without-reloading-the-page) |
| 285 | [How do you check whether an array includes a particular value or not](#how-do-you-check-whether-an-array-includes-a-particular-value-or-not) |
| 286 | [How do you compare scalar arrays](#how-do-you-compare-scalar-arrays) |
| 287 | [How to get the value from get parameters](#how-to-get-the-value-from-get-parameters) |
| 288 | [How do you print numbers with commas as thousand separators](#how-do-you-print-numbers-with-commas-as-thousand-separators) |
| 289 | [What is the difference between java and javascript](#what-is-the-difference-between-java-and-javascript) |
| 290 | [Does javascript supports namespace](#does-javascript-supports-namespace) |
| 291 | [How do you declare namespace](#how-do-you-declare-namespace) |
| 292 | [How do you invoke javascript code in an iframe from parent page](#how-do-you-invoke-javascript-code-in-an-iframe-from-parent-page) |
| 293 | [How do get the timezone offset from date](#how-do-get-the-timezone-offset-from-date) |
| 294 | [How do you load CSS and JS files dynamically](#how-do-you-load-css-and-js-files-dynamically) |
| 295 | [What are the different methods to find HTML elements in DOM](#what-are-the-different-methods-to-find-html-elements-in-dom) |
| 296 | [What is jQuery](#what-is-jquery) |
| 297 | [What is V8 JavaScript engine](#what-is-v8-javascript-engine) |
| 298 | [Why do we call javascript as dynamic language](#why-do-we-call-javascript-as-dynamic-language) |
| 299 | [What is a void operator](#what-is-a-void-operator) |
| 300 | [How to set the cursor to wait](#how-to-set-the-cursor-to-wait) |
| 301 | [How do you create an infinite loop](#how-do-you-create-an-infinite-loop) |
| 302 | [Why do you need to avoid with statement](#why-do-you-need-to-avoid-with-statement) |
| 303 | [What is the output of below for loops](#what-is-the-output-of-below-for-loops) |
| 304 | [List down some of the features of ES6](#list-down-some-of-the-features-of-es6) |
| 305 | [What is ES6](#what-is-es6) |
| 306 | [Can I redeclare let and const variables](#can-I-redeclare-let-and-const-variables) |
| 307 | [Is const variable makes the value immutable](#is-const-variable-makes-the-value-immutable) |
| 308 | [What are default parameters](#what-are-default-parameters) |
| 309 | [What are template literals](#what-are-template-literals) |
| 310 | [How do you write multi-line strings in template literals](#how-do-you-write-multi-line-strings-in-template-literals) |
| 311 | [What are nesting templates](#what-are-nesting-templates) |
| 312 | [What are tagged templates](#what-are-tagged-templates) |
| 313 | [What are raw strings](#what-are-raw-strings) |
| 314 | [What is destructuring assignment](#what-is-destructuring-assignment) |
| 315 | [What are default values in destructuring assignment](#what-are-default-values-in-destructuring-assignment) |
| 316 | [How do you swap variables in destructuring assignment](#how-do-you-swap-variables-in-destructuring-assignment) |
| 317 | [What are enhanced object literals](#what-are-enhanced-object-literals) |
| 318 | [What are dynamic imports](#what-are-dynamic-imports) |
| 319 | [What are the use cases for dynamic imports](#what-are-the-use-cases-for-dynamic-imports) |
| 320 | [What are typed arrays](#what-are-typed-arrays) |
| 321 | [What are the advantages of module loaders](#what-are-the-advantages-of-module-loaders) |
| 322 | [What is collation](#what-is-collation) |
| 323 | [What is for...of statement](#what-is-forof-statement) |
| 324 | [What is the output of below spread operator array](#what-is-the-output-of-below-spread-operator-array) |
| 325 | [Is PostMessage secure](#is-postmessage-secure) |
| 326 | [What are the problems with postmessage target origin as wildcard](#what-are-the-problems-with-postmessage-target-origin-as-wildcard) |
| 327 | [How do you avoid receiving postMessages from attackers](#how-do-you-avoid-receiving-postmessages-from-attackers) |
| 328 | [Can I avoid using postMessages completely](#can-i-avoid-using-postmessages-completely) |
| 329 | [Is postMessages synchronous](#is-postmessages-synchronous) |
| 330 | [What paradigm is Javascript](#what-paradigm-is-javascript) |
| 331 | [What is the difference between internal and external javascript](#what-is-the-difference-between-internal-and-external-javascript) |
| 332 | [Is JavaScript faster than server side script](#is-javascript-faster-than-server-side-script) |
| 333 | [How do you get the status of a checkbox](#how-do-you-get-the-status-of-a-checkbox) |
| 334 | [What is the purpose of double tilde operator](#what-is-the-purpose-of-double-tilde-operator) |
| 335 | [How do you convert character to ASCII code](#how-do-you-convert-character-to-ascii-code) |
| 336 | [What is ArrayBuffer](#what-is-arraybuffer) |
| 337 | [What is the output of below string expression](#what-is-the-output-of-below-string-expression) |
| 338 | [What is the purpose of Error object](#what-is-the-purpose-of-error-object) |
| 339 | [What is the purpose of EvalError object](#what-is-the-purpose-of-evalerror-object) |
| 340 | [What are the list of cases error thrown from non-strict mode to strict mode](#what-are-the-list-of-cases-error-thrown-from-non-strict-mode-to-strict-mode) |
| 341 | [Do all objects have prototypes](#do-all-objects-have-prototypes) |
| 342 | [What is the difference between a parameter and an argument](#what-is-the-difference-between-a-parameter-and-an-argument) |
| 343 | [What is the purpose of some method in arrays](#what-is-the-purpose-of-some-method-in-arrays) |
| 344 | [How do you combine two or more arrays](#how-do-you-combine-two-or-more-arrays) |
| 345 | [What is the difference between Shallow and Deep copy](#what-is-the-difference-between-shallow-and-deep-copy) |
| 346 | [How do you create specific number of copies of a string](#how-do-you-create-specific-number-of-copies-of-a-string) |
| 347 | [How do you return all matching strings against a regular expression](#how-do-you-return-all-matching-strings-against-a-regular-expression) |
| 348 | [How do you trim a string at the beginning or ending](#how-do-you-trim-a-string-at-the-beginning-or-ending) |
| 349 | [What is the output of below console statement with unary operator](#what-is-the-output-of-below-console-statement-with-unary-operator) |
| 350 | [Does javascript uses mixins](#does-javascript-uses-mixins) |
| 351 | [What is a thunk function](#what-is-a-thunk-function) |
| 352 | [What are asynchronous thunks](#what-are-asynchronous-thunks) |
| 353 | [What is the output of below function calls](#what-is-the-output-of-below-function-calls) |
| 354 | [How to remove all line breaks from a string](#how-to-remove-all-line-breaks-from-a-string) |
| 355 | [What is the difference between reflow and repaint](#what-is-the-difference-between-reflow-and-repaint) |
| 356 | [What happens with negating an array](#what-happens-with-negating-an-array) |
| 357 | [What happens if we add two arrays](#what-happens-if-we-add-two-arrays) |
| 358 | [What is the output of prepend additive operator on falsy values](#what-is-the-output-of-prepend-additive-operator-on-falsy-values) |
| 359 | [How do you create self string using special characters](#how-do-you-create-self-string-using-special-characters) |
| 360 | [How do you remove falsy values from an array](#how-do-you-remove-falsy-values-from-an-array) |
| 361 | [How do you get unique values of an array](#how-do-you-get-unique-values-of-an-array) |
| 362 | [What is destructuring aliases](#what-is-destructuring-aliases) |
| 363 | [How do you map the array values without using map method](#how-do-you-map-the-array-values-without-using-map-method) |
| 364 | [How do you empty an array](#how-do-you-empty-an-array) |
| 365 | [How do you round numbers to certain decimals](#how-do-you-rounding-numbers-to-certain-decimals) |
| 366 | [What is the easiest way to convert an array to an object](#what-is-the-easiest-way-to-convert-an-array-to-an-object) |
| 367 | [How do you create an array with some data](#how-do-you-create-an-array-with-some-data) |
| 368 | [What are the placeholders from console object](#what-are-the-placeholders-from-console-object) |
| 369 | [Is it possible to add CSS to console messages](#is-it-possible-to-add-css-to-console-messages) |
| 370 | [What is the purpose of dir method of console object](#what-is-the-purpose-of-dir-method-of-console-object) |
| 371 | [Is it possible to debug HTML elements in console](#is-it-possible-to-debug-html-elements-in-console) |
| 372 | [How do you display data in a tabular format using console object](#how-do-you-display-data-in-a-tabular-format-using-console-object) |
| 373 | [How do you verify that an argument is a Number or not](#how-do-you-verify-that-an-argument-is-a-number-or-not) |
| 374 | [How do you create copy to clipboard button](#how-do-you-create-copy-to-clipboard-button) |
| 375 | [What is the shortcut to get timestamp](#what-is-the-shortcut-to-get-timestamp) |
| 376 | [How do you flattening multi dimensional arrays](#how-do-you-flattening-multi-dimensional-arrays) |
| 377 | [What is the easiest multi condition checking](#what-is-the-easiest-multi-condition-checking) |
| 378 | [How do you capture browser back button](#how-do-you-capture-browser-back-button) |
| 379 | [How do you disable right click in the web page](#how-do-you-disable-right-click-in-the-web-page) |
| 380 | [What are wrapper objects](#what-are-wrapper-objects) |
| 381 | [What is AJAX](#what-is-ajax) |
| 382 | [What are the different ways to deal with Asynchronous Code](#what-are-the-different-ways-to-deal-with-asynchronous-code) |
| 383 | [How to cancel a fetch request](#how-to-cancel-a-fetch-request) |
| 384 | [What is web speech API](#what-is-web-speech-api) |
| 385 | [What is minimum timeout throttling](#what-is-minimum-timeout-throttling) |
| 386 | [How do you implement zero timeout in modern browsers](#how-do-you-implement-zero-timeout-in-modern-browsers) |
| 387 | [What are tasks in event loop](#what-are-tasks-in-event-loop) |
| 388 | [What is microtask](#what-is-microtask) |
| 389 | [What are different event loops](#what-are-different-event-loops) |
| 390 | [What is the purpose of queueMicrotask](#what-is-the-purpose-of-queuemicrotask) |
| 391 | [How do you use javascript libraries in typescript file](#how-do-you-use-javascript-libraries-in-typescript-file) |
| 392 | [What are the differences between promises and observables](#what-are-the-differences-between-promises-and-observables) |
| 393 | [What is heap](#what-is-heap) |
| 394 | [What is an event table](#what-is-an-event-table) |
| 395 | [What is a microTask queue](#what-is-a-microtask-queue) |
| 396 | [What is the difference between shim and polyfill](#what-is-the-difference-between-shim-and-polyfill) |
| 397 | [How do you detect primitive or non primitive value type](#how-do-you-detect-primitive-or-non-primitive-value-type) |
| 398 | [What is babel](#what-is-babel) |
| 399 | [Is Node.js completely single threaded](#is-nodejs-completely-single-threaded) |
| 400 | [What are the common use cases of observables](#what-are-the-common-use-cases-of-observables) |
| 401 | [What is RxJS](#what-is-rxjs) |
| 402 | [What is the difference between Function constructor and function declaration](#what-is-the-difference-between-function-constructor-and-function-declaration) |
| 403 | [What is a Short circuit condition](#what-is-a-short-circuit-condition) |
| 404 | [What is the easiest way to resize an array](#what-is-the-easiest-way-to-resize-an-array) |
| 405 | [What is an observable](#what-is-an-observable) |
| 406 | [What is the difference between function and class declarations](#what-is-the-difference-between-function-and-class-declarations) |
| 407 | [What is an async function](#what-is-an-async-function) |
| 408 | [How do you prevent promises swallowing errors](#how-do-you-prevent-promises-swallowing-errors) |
| 409 | [What is deno](#what-is-deno) |
| 410 | [How do you make an object iterable in javascript](#how-do-you-make-an-object-iterable-in-javascript) |
| 411 | [What is a Proper Tail Call](#what-is-a-proper-tail-call) |
| 412 | [How do you check an object is a promise or not](#how-do-you-check-an-object-is-a-promise-or-not) |
| 413 | [How to detect if a function is called as constructor](#how-to-detect-if-a-function-is-called-as-constructor) |
| 414 | [What are the differences between arguments object and rest parameter](#what-are-the-differences-between-arguments-object-and-rest-parameter) |
| 415 | [What are the differences between spread operator and rest parameter](#what-are-the-differences-between-spread-operator-and-rest-parameter) |
| 416 | [What are the different kinds of generators](#what-are-the-different-kinds-of-generators) |
| 417 | [What are the built-in iterables](#what-are-the-built-in-iterables) |
| 418 | [What are the differences between for...of and for...in statements](#what-are-the-differences-between-forof-and-forin-statements) |
| 419 | [How do you define instance and non-instance properties](#how-do-you-define-instance-and-non-instance-properties) |
| 420 | [What is the difference between isNaN and Number.isNaN?](#what-is-the-difference-between-isnan-and-numberisnan) |
| 421 | [How to invoke an IIFE without any extra brackets?](#how-to-invoke-an-iife-without-any-extra-brackets) |
| 422 | [Is that possible to use expressions in switch cases?](#is-that-possible-to-use-expressions-in-switch-cases) |
| 423 | [What is the easiest way to ignore promise errors?](#what-is-the-easiest-way-to-ignore-promise-errors) |
| 424 | [How do style the console output using CSS?](#how-do-style-the-console-output-using-css) |
| 425 | [What is nullish coalescing operator (??)?](#what-is-nullish-coalescing-operator) |
| 426 | [How do you group and nest console output?](#how-do-you-group-and-nest-console-output) |
| 427 | [What is the difference between dense and sparse arrays?](#what-is-the-difference-between-dense-and-sparse-arrays) |
| 428 | [What are the different ways to create sparse arrays?](#what-are-the-different-ways-to-create-sparse-arrays) |
| 429 | [What is the difference between setTimeout, setImmediate and process.nextTick?](#what-is-the-difference-between-settimeout-setimmediate-and-processnexttick) |
| 430 | [How do you reverse an array without modifying original array?](#how-do-you-reverse-an-array-without-modifying-original-array) |
| 431 | [How do you create custom HTML element?](#how-do-you-create-custom-html-element) |
| 432 | [What is global execution context?](#what-is-global-execution-context) |
| 433 | [What is function execution context?](#what-is-function-execution-context) |
| 434 | [What is debouncing?](#what-is-debouncing) |
| 435 | [What is throttling?](#what-is-throttling) |
| 436 | [What is optional chaining?](#what-is-optional-chaining) |
| 437 | [What is an environment record?](#what-is-an-environment-record) |
| 438 | [How to verify if a variable is an array?](#how-to-verify-if-a-variable-is-an-array) |
| 439 | [What is pass by value and pass by reference?](#what-is-pass-by-value-and-pass-by-reference) |
| 440 | [What are the differences between primitives and non-primitives?](#what-are-the-differences-between-primitives-and-non-primitives) |
| 441 | [What are hidden classes?](#what-are-hidden-classes) |
| 442 | [What is inline caching?](#what-is-inline-caching) |
| 443 | [How do you create your own bind method using either call or apply method?](#how-do-you-create-your-own-bind-method-using-either-call-or-apply-method) |
| 444 | [What are the differences between pure and impure functions?](#what-are-the-differences-between-pure-and-impure-functions?) |
| 445 | [What is referential transparency?](#what-is-referential-transparency) |
| 446 | [What are the possible side-effects in javascript?](#what-are-the-possible-side-effects-in-javascript) |
| 447 | [What are compose and pipe functions?](#what-are-compose-and-pipe-functions) |
| 448 | [What is module pattern?](#what-is-module-pattern) |
| 449 | [What is Function Composition?](#what-is-function-composition) |
| 450 | [How to use await outside of async function prior to ES2022?](#how-to-use-await-outside-of-async-function-prior-to-es2022) |
| 451 | [What is the purpose of the this keyword in JavaScript?](#what_is_the_purpose_of_the_this_keyword_in_javascript?) |
1. ### What are the possible ways to create objects in JavaScript
There are many ways to create objects in javascript as mentioned below:
1. **Object literal syntax:**
The object literal syntax (or object initializer), is a comma-separated set of name-value pairs wrapped in curly braces.
```javascript
var object = {
name: "Sudheer",
age: 34
};
```
Object literal property values can be of any data type, including array, function, and nested object.
**Note:** This is one of the easiest ways to create an object.
2. **Object constructor:**
The simplest way to create an empty object is using the `Object` constructor. Currently this approach is not recommended.
```javascript
var object = new Object();
```
The `Object()` is a built-in constructor function so "new" keyword is not required. The above code snippet can be re-written as:
```javascript
var object = Object();
```
3. **Object's create method:**
The `create` method of Object is used to create a new object by passing the specificied prototype object and properties as arguments, i.e., this pattern is helpful to create new objects based on existing objects.
The second argument is optional and it is used to create properties on a newly created object.
The following code creates a new empty object whose prototype is null.
```javascript
var object = Object.create(null);
```
The following example creates an object along with additional new properties.
```javascript
let vehicle = {
wheels: '4',
fuelType: 'Gasoline',
color: 'Green'
}
let carProps = {
type: {
value: 'Volkswagen'
},
model: {
value: 'Golf'
}
}
var car = Object.create(vehicle, carProps);
console.log(car);
```
4. **Function constructor:**
In this approach, create any function and apply the new operator to create object instances.
```javascript
function Person(name) {
this.name = name;
this.age = 21;
}
var object = new Person("Sudheer");
```
5. **Function constructor with prototype:**
This is similar to function constructor but it uses prototype for their properties and methods,
```javascript
function Person() {}
Person.prototype.name = "Sudheer";
var object = new Person();
```
This is equivalent to creating an instance with Object.create method with a function prototype and then calling that function with an instance and parameters as arguments.
```javascript
function func() {}
new func(x, y, z);
```
**(OR)**
```javascript
// Create a new instance using function prototype.
var newInstance = Object.create(func.prototype)
// Call the function
var result = func.call(newInstance, x, y, z),
// If the result is a non-null object then use it otherwise just use the new instance.
console.log(result && typeof result === 'object' ? result : newInstance);
```
6. **Object's assign method:**
The `Object.assign` method is used to copy all the properties from one or more source objects and stores them into a target object.
The following code creates a new staff object by copying properties of his working company and the car he owns.
```javascript
const orgObject = { company: 'XYZ Corp'};
const carObject = { name: 'Toyota'};
const staff = Object.assign({}, orgObject, carObject);
```
7. **ES6 Class syntax:**
ES6 introduces class feature to create objects.
```javascript
class Person {
constructor(name) {
this.name = name;
}
}
var object = new Person("Sudheer");
```
8. **Singleton pattern:**
A Singleton is an object which can only be instantiated one time. Repeated calls to its constructor return the same instance. This way one can ensure that they don't accidentally create multiple instances.
```javascript
var object = new (function () {
this.name = "Sudheer";
})();
```
**[⬆ Back to Top](#table-of-contents)**
2. ### What is a prototype chain
**Prototype chaining** is used to build new types of objects based on existing ones. It is similar to inheritance in a class based language.
The prototype on object instance is available through **Object.getPrototypeOf(object)** or **\_\_proto\_\_** property whereas prototype on constructors function is available through **Object.prototype**.
**[⬆ Back to Top](#table-of-contents)**
3. ### What is the difference between Call, Apply and Bind
The difference between Call, Apply and Bind can be explained with below examples,
**Call:** The call() method invokes a function with a given `this` value and arguments provided one by one
```javascript
var employee1 = { firstName: "John", lastName: "Rodson" };
var employee2 = { firstName: "Jimmy", lastName: "Baily" };
function invite(greeting1, greeting2) {
console.log(
greeting1 + " " + this.firstName + " " + this.lastName + ", " + greeting2
);
}
invite.call(employee1, "Hello", "How are you?"); // Hello John Rodson, How are you?
invite.call(employee2, "Hello", "How are you?"); // Hello Jimmy Baily, How are you?
```
**Apply:** Invokes the function with a given `this` value and allows you to pass in arguments as an array
```javascript
var employee1 = { firstName: "John", lastName: "Rodson" };
var employee2 = { firstName: "Jimmy", lastName: "Baily" };
function invite(greeting1, greeting2) {
console.log(
greeting1 + " " + this.firstName + " " + this.lastName + ", " + greeting2
);
}
invite.apply(employee1, ["Hello", "How are you?"]); // Hello John Rodson, How are you?
invite.apply(employee2, ["Hello", "How are you?"]); // Hello Jimmy Baily, How are you?
```
**Bind:** returns a new function, allowing you to pass any number of arguments
```javascript
var employee1 = { firstName: "John", lastName: "Rodson" };
var employee2 = { firstName: "Jimmy", lastName: "Baily" };
function invite(greeting1, greeting2) {
console.log(
greeting1 + " " + this.firstName + " " + this.lastName + ", " + greeting2
);
}
var inviteEmployee1 = invite.bind(employee1);
var inviteEmployee2 = invite.bind(employee2);
inviteEmployee1("Hello", "How are you?"); // Hello John Rodson, How are you?
inviteEmployee2("Hello", "How are you?"); // Hello Jimmy Baily, How are you?
```
Call and Apply are pretty much interchangeable. Both execute the current function immediately. You need to decide whether it’s easier to send in an array or a comma separated list of arguments. You can remember by treating Call is for **comma** (separated list) and Apply is for **Array**.
Bind creates a new function that will have `this` set to the first parameter passed to bind().
**[⬆ Back to Top](#table-of-contents)**
4. ### What is JSON and its common operations
**JSON** is a text-based data format following JavaScript object syntax, which was popularized by `Douglas Crockford`. It is useful when you want to transmit data across a network. It is basically just a text file with an extension of .json, and a MIME type of application/json
**Parsing:** Converting a string to a native object
```javascript
JSON.parse(text);
```
**Stringification:** Converting a native object to a string so that it can be transmitted across the network
```javascript
JSON.stringify(object);
```
**[⬆ Back to Top](#table-of-contents)**
5. ### What is the purpose of the array slice method
The **slice()** method returns the selected elements in an array as a new array object. It selects the elements starting at the given start argument, and ends at the given optional end argument without including the last element. If you omit the second argument then it selects till the end of the array.
Some of the examples of this method are,
```javascript
let arrayIntegers = [1, 2, 3, 4, 5];
let arrayIntegers1 = arrayIntegers.slice(0, 2); // returns [1,2]
let arrayIntegers2 = arrayIntegers.slice(2, 3); // returns [3]
let arrayIntegers3 = arrayIntegers.slice(4); //returns [5]
```
**Note:** Slice method doesn't mutate the original array but it returns the subset as a new array.
**[⬆ Back to Top](#table-of-contents)**
6. ### What is the purpose of the array splice method
The **splice()** method adds/removes items to/from an array, and then returns the removed item. The first argument specifies the array position/index for insertion or deletion whereas the optional second argument indicates the number of elements to be deleted. Each additional argument is added to the array.
Some of the examples of this method are:
```javascript
let arrayIntegersOriginal1 = [1, 2, 3, 4, 5];
let arrayIntegersOriginal2 = [1, 2, 3, 4, 5];
let arrayIntegersOriginal3 = [1, 2, 3, 4, 5];
let arrayIntegers1 = arrayIntegersOriginal1.splice(0, 2); // returns [1, 2]; original array: [3, 4, 5]
let arrayIntegers2 = arrayIntegersOriginal2.splice(3); // returns [4, 5]; original array: [1, 2, 3]
let arrayIntegers3 = arrayIntegersOriginal3.splice(3, 1, "a", "b", "c"); //returns [4]; original array: [1, 2, 3, "a", "b", "c", 5]
```
**Note:** Splice method modifies the original array and returns the deleted array.
**[⬆ Back to Top](#table-of-contents)**
7. ### What is the difference between slice and splice
Some of the major differences in a tabular form:
| Slice | Splice |
| -------------------------------------------- | ----------------------------------------------- |
| Doesn't modify the original array(immutable) | Modifies the original array(mutable) |
| Returns the subset of original array | Returns the deleted elements as array |
| Used to pick the elements from array | Used to insert/delete elements to/from array |
**[⬆ Back to Top](#table-of-contents)**
8. ### How do you compare Object and Map
**Objects** are similar to **Maps** in that both let you set keys to values, retrieve those values, delete keys, and detect whether something is stored at a key. Due to this reason, Objects have been used as Maps historically. But there are important differences that make using a Map preferable in certain cases:
1. The keys of an Object can be Strings and Symbols, whereas they can be any value for a Map, including functions, objects, and any primitive.
2. The keys in a Map are ordered while keys added to Object are not. Thus, when iterating over it, a Map object returns keys in the order of insertion.
3. You can get the size of a Map easily with the size property, while the number of properties in an Object must be determined manually.
4. A Map is an iterable and can thus be directly iterated, whereas iterating over an Object requires obtaining its keys in some fashion and iterating over them.
5. An Object has a prototype, so there are default keys in an object that could collide with your keys if you're not careful. As of ES5 this can be bypassed by creating an object(which can be called a map) using `Object.create(null)`, but this practice is seldom done.
6. A Map may perform better in scenarios involving frequent addition and removal of key pairs.
**[⬆ Back to Top](#table-of-contents)**
9. ### What is the difference between == and === operators
JavaScript provides both strict(===, !==) and type-converting(==, !=) equality comparison. The strict operators take type of variable in consideration, while non-strict operators make type correction/conversion based upon values of variables. The strict operators follow the below conditions for different types,
1. Two strings are strictly equal when they have the same sequence of characters, same length, and same characters in corresponding positions.
2. Two numbers are strictly equal when they are numerically equal, i.e., having the same number value.
There are two special cases in this,
1. NaN is not equal to anything, including NaN.
2. Positive and negative zeros are equal to one another.
3. Two Boolean operands are strictly equal if both are true or both are false.
4. Two objects are strictly equal if they refer to the same Object.
5. Null and Undefined types are not equal with ===, but equal with == .
i.e, `null===undefined --> false`, but `null==undefined --> true`
Some of the example which covers the above cases:
```javascript
0 == false // true
0 === false // false
1 == "1" // true
1 === "1" // false
null == undefined // true
null === undefined // false
'0' == false // true
'0' === false // false
NaN == NaN or NaN === NaN // false
[]==[] or []===[] //false, refer different objects in memory
{}=={} or {}==={} //false, refer different objects in memory
```
**[⬆ Back to Top](#table-of-contents)**
10. ### What are lambda expressions or arrow functions
An arrow function is a shorter/concise syntax for a function expression and does not have its own **this, arguments, super, or new.target**. These functions are best suited for non-method functions, and they cannot be used as constructors.
Some of the examples of arrow functions are listed as below,
```javascript
const arrowFunc1 = (a, b) => a + b; // Multiple parameters
const arrowFunc2 = a => a * 10; // Single parameter
const arrowFunc3 = () => {} // no parameters
```
**[⬆ Back to Top](#table-of-contents)**
11. ### What is a first class function
In Javascript, functions are first class objects. First-class functions means when functions in that language are treated like any other variable.
For example, in such a language, a function can be passed as an argument to other functions, can be returned by another function and can be assigned as a value to a variable. For example, in the below example, handler functions assigned to a listener
```javascript
const handler = () => console.log("This is a click handler function");
document.addEventListener("click", handler);
```
**[⬆ Back to Top](#table-of-contents)**
12. ### What is a first order function
A first-order function is a function that doesn’t accept another function as an argument and doesn’t return a function as its return value.
```javascript
const firstOrder = () => console.log("I am a first order function!");
```
**[⬆ Back to Top](#table-of-contents)**
13. ### What is a higher order function
A higher-order function is a function that accepts another function as an argument or returns a function as a return value or both.
```javascript
const firstOrderFunc = () =>
console.log("Hello, I am a First order function");
const higherOrder = (ReturnFirstOrderFunc) => ReturnFirstOrderFunc();
higherOrder(firstOrderFunc);
```
**[⬆ Back to Top](#table-of-contents)**
14. ### What is a unary function
A unary function (i.e. monadic) is a function that accepts exactly one argument. It stands for a single argument accepted by a function.
Let us take an example of unary function,
```javascript
const unaryFunction = (a) => console.log(a + 10); // Add 10 to the given argument and display the value
```
**[⬆ Back to Top](#table-of-contents)**
15. ### What is the currying function
Currying is the process of taking a function with multiple arguments and turning it into a sequence of functions each with only a single argument. Currying is named after a mathematician **Haskell Curry**. By applying currying, an n-ary function turns into a unary function.
Let's take an example of n-ary function and how it turns into a currying function,
```javascript
const multiArgFunction = (a, b, c) => a + b + c;
console.log(multiArgFunction(1, 2, 3)); // 6
const curryUnaryFunction = (a) => (b) => (c) => a + b + c;
curryUnaryFunction(1); // returns a function: b => c => 1 + b + c
curryUnaryFunction(1)(2); // returns a function: c => 3 + c
curryUnaryFunction(1)(2)(3); // returns the number 6
```
Curried functions are great to improve **code reusability** and **functional composition**.
**[⬆ Back to Top](#table-of-contents)**
16. ### What is a pure function
A **Pure function** is a function where the return value is only determined by its arguments without any side effects. i.e, If you call a function with the same arguments 'n' number of times and 'n' number of places in the application then it will always return the same value.
Let's take an example to see the difference between pure and impure functions,
```javascript
//Impure
let numberArray = [];
const impureAddNumber = (number) => numberArray.push(number);
//Pure
const pureAddNumber = (number) => (argNumberArray) =>
argNumberArray.concat([number]);
//Display the results
console.log(impureAddNumber(6)); // returns 1
console.log(numberArray); // returns [6]
console.log(pureAddNumber(7)(numberArray)); // returns [6, 7]
console.log(numberArray); // returns [6]
```
As per the above code snippets, the **Push** function is impure itself by altering the array and returning a push number index independent of the parameter value, whereas **Concat** on the other hand takes the array and concatenates it with the other array producing a whole new array without side effects. Also, the return value is a concatenation of the previous array.
Remember that Pure functions are important as they simplify unit testing without any side effects and no need for dependency injection. They also avoid tight coupling and make it harder to break your application by not having any side effects. These principles are coming together with the **Immutability** concept of ES6: giving preference to **const** over **let** usage.
**[⬆ Back to Top](#table-of-contents)**
17. ### What is the purpose of the let keyword
The `let` statement declares a **block scope local variable**. Hence the variables defined with let keyword are limited in scope to the block, statement, or expression on which it is used. Whereas variables declared with the `var` keyword used to define a variable globally, or locally to an entire function regardless of block scope.
Let's take an example to demonstrate the usage,
```javascript
let counter = 30;
if (counter === 30) {
let counter = 31;
console.log(counter); // 31
}
console.log(counter); // 30 (because the variable in if block won't exist here)
```
**[⬆ Back to Top](#table-of-contents)**
18. ### What is the difference between let and var
You can list out the differences in a tabular format
| var | let |
| ----------------------------------------------------- | --------------------------- |
| It has been available from the beginning of JavaScript | Introduced as part of ES6 |
| It has function scope | It has block scope |
| Variable declaration will be hoisted | Hoisted but not initialized |
| It is possible to re-declare the variable in the same scope | It is not possible to re-declare the variable |
Let's take an example to see the difference,
```javascript
function userDetails(username) {
if (username) {
console.log(salary); // undefined due to hoisting
console.log(age); // ReferenceError: Cannot access 'age' before initialization
let age = 30;
var salary = 10000;
}
console.log(salary); //10000 (accessible due to function scope)
console.log(age); //error: age is not defined(due to block scope)
}
userDetails("John");
```
**[⬆ Back to Top](#table-of-contents)**
19. ### What is the reason to choose the name let as a keyword
`let` is a mathematical statement that was adopted by early programming languages like **Scheme** and **Basic**. It has been borrowed from dozens of other languages that use `let` already as a traditional keyword as close to `var` as possible.
**[⬆ Back to Top](#table-of-contents)**
20. ### How do you redeclare variables in a switch block without an error
If you try to redeclare variables in a `switch block` then it will cause errors because there is only one block. For example, the below code block throws a syntax error as below,
```javascript
let counter = 1;
switch (x) {
case 0:
let name;
break;
case 1:
let name; // SyntaxError for redeclaration.
break;
}
```
To avoid this error, you can create a nested block inside a case clause and create a new block scoped lexical environment.
```javascript
let counter = 1;
switch (x) {
case 0: {
let name;
break;
}
case 1: {
let name; // No SyntaxError for redeclaration.
break;
}
}
```
**[⬆ Back to Top](#table-of-contents)**
21. ### What is the Temporal Dead Zone
The Temporal Dead Zone(TDZ) is a specific period or area of a block where a variable is inaccessible until it has been intialized with a value. This behavior in JavaScript that occurs when declaring a variable with the let and const keywords, but not with var. In ECMAScript 6, accessing a `let` or `const` variable before its declaration (within its scope) causes a ReferenceError.
Let's see this behavior with an example,
```javascript
function somemethod() {
console.log(counter1); // undefined
console.log(counter2); // ReferenceError
var counter1 = 1;
let counter2 = 2;
}
```
**[⬆ Back to Top](#table-of-contents)**
22. ### What is an IIFE (Immediately Invoked Function Expression)
IIFE (Immediately Invoked Function Expression) is a JavaScript function that runs as soon as it is defined. The signature of it would be as below,
```javascript
(function () {
// logic here
})();
```
The primary reason to use an IIFE is to obtain data privacy because any variables declared within the IIFE cannot be accessed by the outside world. i.e, If you try to access variables from the IIFE then it throws an error as below,
```javascript
(function () {
var message = "IIFE";
console.log(message);
})();
console.log(message); //Error: message is not defined
```
**[⬆ Back to Top](#table-of-contents)**
23. ### How do you decode or encode a URL in JavaScript?
`encodeURI()` function is used to encode an URL. This function requires a URL string as a parameter and return that encoded string.
`decodeURI()` function is used to decode an URL. This function requires an encoded URL string as parameter and return that decoded string.
**Note:** If you want to encode characters such as `/ ? : @ & = + $ #` then you need to use `encodeURIComponent()`.
```javascript
let uri = "employeeDetails?name=john&occupation=manager";
let encoded_uri = encodeURI(uri);
let decoded_uri = decodeURI(encoded_uri);
```
**[⬆ Back to Top](#table-of-contents)**
24. ### What is memoization
Memoization is a functional programming technique which attempts to increase a function’s performance by caching its previously computed results. Each time a memoized function is called, its parameters are used to index the cache. If the data is present, then it can be returned, without executing the entire function. Otherwise the function is executed and then the result is added to the cache.
Let's take an example of adding function with memoization,
```javascript
const memoizAddition = () => {
let cache = {};
return (value) => {
if (value in cache) {
console.log("Fetching from cache");
return cache[value]; // Here, cache.value cannot be used as property name starts with the number which is not a valid JavaScript identifier. Hence, can only be accessed using the square bracket notation.
} else {
console.log("Calculating result");
let result = value + 20;
cache[value] = result;
return result;
}
};
};
// returned function from memoizAddition
const addition = memoizAddition();
console.log(addition(20)); //output: 40 calculated
console.log(addition(20)); //output: 40 cached
```
**[⬆ Back to Top](#table-of-contents)**
25. ### What is Hoisting
Hoisting is a JavaScript mechanism where variables, function declarations and classes are moved to the top of their scope before code execution. Remember that JavaScript only hoists declarations, not initialisation.
Let's take a simple example of variable hoisting,
```javascript
console.log(message); //output : undefined
var message = "The variable Has been hoisted";
```
The above code looks like as below to the interpreter,
```javascript
var message;
console.log(message);
message = "The variable Has been hoisted";
```
In the same fashion, function declarations are hoisted too
```javascript
message("Good morning"); //Good morning
function message(name) {
console.log(name);
}
```
This hoisting makes functions to be safely used in code before they are declared.
**[⬆ Back to Top](#table-of-contents)**
26. ### What are classes in ES6
In ES6, Javascript classes are primarily syntactic sugar over JavaScript’s existing prototype-based inheritance.
For example, the prototype based inheritance written in function expression as below,
```javascript
function Bike(model, color) {
this.model = model;
this.color = color;
}
Bike.prototype.getDetails = function () {
return this.model + " bike has" + this.color + " color";
};
```
Whereas ES6 classes can be defined as an alternative
```javascript
class Bike {
constructor(color, model) {
this.color = color;
this.model = model;
}
getDetails() {
return this.model + " bike has" + this.color + " color";
}
}
```
**[⬆ Back to Top](#table-of-contents)**
27. ### What are closures
A closure is the combination of a function and the lexical environment within which that function was declared. i.e, It is an inner function that has access to the outer or enclosing function’s variables, functions and other data even after the outer function has finished its execution. The closure has three scope chains.
1. Own scope where variables defined between its curly brackets
2. Outer function’s variables
3. Global variables
Let's take an example of closure concept,
```javascript
function Welcome(name) {
var greetingInfo = function (message) {
console.log(message + " " + name);
};
return greetingInfo;
}
var myFunction = Welcome("John");
myFunction("Welcome "); //Output: Welcome John
myFunction("Hello Mr."); //output: Hello Mr. John
```
As per the above code, the inner function(i.e, greetingInfo) has access to the variables in the outer function scope(i.e, Welcome) even after the outer function has returned.
**[⬆ Back to Top](#table-of-contents)**
28. ### What are modules
Modules refer to small units of independent, reusable code and also act as the foundation of many JavaScript design patterns. Most of the JavaScript modules export an object literal, a function, or a constructor
**[⬆ Back to Top](#table-of-contents)**
29. ### Why do you need modules
Below are the list of benefits using modules in javascript ecosystem
1. Maintainability
2. Reusability
3. Namespacing
**[⬆ Back to Top](#table-of-contents)**
30. ### What is scope in javascript
Scope is the accessibility of variables, functions, and objects in some particular part of your code during runtime. In other words, scope determines the visibility of variables and other resources in areas of your code.
**[⬆ Back to Top](#table-of-contents)**
31. ### What is a service worker
A Service worker is basically a script (JavaScript file) that runs in the background, separate from a web page and provides features that don't need a web page or user interaction. Some of the major features of service workers are Rich offline experiences(offline first web application development), periodic background syncs, push notifications, intercept and handle network requests and programmatically managing a cache of responses.
**[⬆ Back to Top](#table-of-contents)**
32. ### How do you manipulate DOM using a service worker
Service worker can't access the DOM directly. But it can communicate with the pages it controls by responding to messages sent via the `postMessage` interface, and those pages can manipulate the DOM.
**[⬆ Back to Top](#table-of-contents)**
33. ### How do you reuse information across service worker restarts
The problem with service worker is that it gets terminated when not in use, and restarted when it's next needed, so you cannot rely on global state within a service worker's `onfetch` and `onmessage` handlers. In this case, service workers will have access to IndexedDB API in order to persist and reuse across restarts.
**[⬆ Back to Top](#table-of-contents)**
34. ### What is IndexedDB
IndexedDB is a low-level API for client-side storage of larger amounts of structured data, including files/blobs. This API uses indexes to enable high-performance searches of this data.
**[⬆ Back to Top](#table-of-contents)**
35. ### What is web storage
Web storage is an API that provides a mechanism by which browsers can store key/value pairs locally within the user's browser, in a much more intuitive fashion than using cookies. The web storage provides two mechanisms for storing data on the client.
1. **Local storage:** It stores data for current origin with no expiration date.
2. **Session storage:** It stores data for one session and the data is lost when the browser tab is closed.
**[⬆ Back to Top](#table-of-contents)**
36. ### What is a post message
Post message is a method that enables cross-origin communication between Window objects.(i.e, between a page and a pop-up that it spawned, or between a page and an iframe embedded within it). Generally, scripts on different pages are allowed to access each other if and only if the pages follow same-origin policy(i.e, pages share the same protocol, port number, and host).
**[⬆ Back to Top](#table-of-contents)**
37. ### What is a Cookie
A cookie is a piece of data that is stored on your computer to be accessed by your browser. Cookies are saved as key/value pairs.
For example, you can create a cookie named username as below,
```javascript
document.cookie = "username=John";
```
**[⬆ Back to Top](#table-of-contents)**
38. ### Why do you need a Cookie
Cookies are used to remember information about the user profile(such as username). It basically involves two steps,
1. When a user visits a web page, the user profile can be stored in a cookie.
2. Next time the user visits the page, the cookie remembers the user profile.
**[⬆ Back to Top](#table-of-contents)**
39. ### What are the options in a cookie
There are few below options available for a cookie,
1. By default, the cookie is deleted when the browser is closed but you can change this behavior by setting expiry date (in UTC time).
```javascript
document.cookie = "username=John; expires=Sat, 8 Jun 2019 12:00:00 UTC";
```
1. By default, the cookie belongs to a current page. But you can tell the browser what path the cookie belongs to using a path parameter.
```javascript
document.cookie = "username=John; path=/services";
```
**[⬆ Back to Top](#table-of-contents)**
40. ### How do you delete a cookie
You can delete a cookie by setting the expiry date as a passed date. You don't need to specify a cookie value in this case.
For example, you can delete a username cookie in the current page as below.
```javascript
document.cookie =
"username=; expires=Fri, 07 Jun 2019 00:00:00 UTC; path=/;";
```
**Note:** You should define the cookie path option to ensure that you delete the right cookie. Some browsers doesn't allow to delete a cookie unless you specify a path parameter.
**[⬆ Back to Top](#table-of-contents)**
41. ### What are the differences between cookie, local storage and session storage
Below are some of the differences between cookie, local storage and session storage,
| Feature | Cookie | Local storage | Session storage |
| --------------------------------- | ---------------------------------- | ---------------- | ------------------- |
| Accessed on client or server side | Both server-side & client-side | client-side only | client-side only |
| Lifetime | As configured using Expires option | until deleted | until tab is closed |
| SSL support | Supported | Not supported | Not supported |
| Maximum data size | 4KB | 5 MB | 5MB |
**[⬆ Back to Top](#table-of-contents)**
42. ### What is the main difference between localStorage and sessionStorage
LocalStorage is the same as SessionStorage but it persists the data even when the browser is closed and reopened(i.e it has no expiration time) whereas in sessionStorage data gets cleared when the page session ends.
**[⬆ Back to Top](#table-of-contents)**
43. ### How do you access web storage
The Window object implements the `WindowLocalStorage` and `WindowSessionStorage` objects which has `localStorage`(window.localStorage) and `sessionStorage`(window.sessionStorage) properties respectively. These properties create an instance of the Storage object, through which data items can be set, retrieved and removed for a specific domain and storage type (session or local).
For example, you can read and write on local storage objects as below
```javascript
localStorage.setItem("logo", document.getElementById("logo").value);
localStorage.getItem("logo");
```
**[⬆ Back to Top](#table-of-contents)**
44. ### What are the methods available on session storage
The session storage provided methods for reading, writing and clearing the session data
```javascript
// Save data to sessionStorage
sessionStorage.setItem("key", "value");
// Get saved data from sessionStorage
let data = sessionStorage.getItem("key");
// Remove saved data from sessionStorage
sessionStorage.removeItem("key");
// Remove all saved data from sessionStorage
sessionStorage.clear();
```
**[⬆ Back to Top](#table-of-contents)**
45. ### What is a storage event and its event handler
The StorageEvent is an event that fires when a storage area has been changed in the context of another document. Whereas onstorage property is an EventHandler for processing storage events.
The syntax would be as below
```javascript
window.onstorage = functionRef;
```
Let's take the example usage of onstorage event handler which logs the storage key and it's values
```javascript
window.onstorage = function (e) {
console.log(
"The " +
e.key +
" key has been changed from " +
e.oldValue +
" to " +
e.newValue +
"."
);
};
```
**[⬆ Back to Top](#table-of-contents)**
46. ### Why do you need web storage
Web storage is more secure, and large amounts of data can be stored locally, without affecting website performance. Also, the information is never transferred to the server. Hence this is a more recommended approach than Cookies.
**[⬆ Back to Top](#table-of-contents)**
47. ### How do you check web storage browser support
You need to check browser support for localStorage and sessionStorage before using web storage,
```javascript
if (typeof Storage !== "undefined") {
// Code for localStorage/sessionStorage.
} else {
// Sorry! No Web Storage support..
}
```
**[⬆ Back to Top](#table-of-contents)**
48. ### How do you check web workers browser support
You need to check browser support for web workers before using it
```javascript
if (typeof Worker !== "undefined") {
// code for Web worker support.
} else {
// Sorry! No Web Worker support..
}
```
**[⬆ Back to Top](#table-of-contents)**
49. ### Give an example of a web worker
You need to follow below steps to start using web workers for counting example
1. Create a Web Worker File: You need to write a script to increment the count value. Let's name it as counter.js
```javascript
let i = 0;
function timedCount() {
i = i + 1;
postMessage(i);
setTimeout("timedCount()", 500);
}
timedCount();
```
Here postMessage() method is used to post a message back to the HTML page
1. Create a Web Worker Object: You can create a web worker object by checking for browser support. Let's name this file as web_worker_example.js
```javascript
if (typeof w == "undefined") {
w = new Worker("counter.js");
}
```
and we can receive messages from web worker
```javascript
w.onmessage = function (event) {
document.getElementById("message").innerHTML = event.data;
};
```
1. Terminate a Web Worker:
Web workers will continue to listen for messages (even after the external script is finished) until it is terminated. You can use the terminate() method to terminate listening to the messages.
```javascript
w.terminate();
```
1. Reuse the Web Worker: If you set the worker variable to undefined you can reuse the code
```javascript
w = undefined;
```
**[⬆ Back to Top](#table-of-contents)**
50. ### What are the restrictions of web workers on DOM
WebWorkers don't have access to below javascript objects since they are defined in an external files
1. Window object
2. Document object
3. Parent object
**[⬆ Back to Top](#table-of-contents)**
51. ### What is a promise
A promise is an object that may produce a single value some time in the future with either a resolved value or a reason that it’s not resolved(for example, network error). It will be in one of the 3 possible states: fulfilled, rejected, or pending.
The syntax of Promise creation looks like below,
```javascript
const promise = new Promise(function (resolve, reject) {
// promise description
});
```
The usage of a promise would be as below,
```javascript
const promise = new Promise(
(resolve) => {
setTimeout(() => {
resolve("I'm a Promise!");
}, 5000);
},
(reject) => {}
);
promise.then((value) => console.log(value));
```
The action flow of a promise will be as below,
**[⬆ Back to Top](#table-of-contents)**
52. ### Why do you need a promise
Promises are used to handle asynchronous operations. They provide an alternative approach for callbacks by reducing the callback hell and writing the cleaner code.
**[⬆ Back to Top](#table-of-contents)**
53. ### What are the three states of promise
Promises have three states:
1. **Pending:** This is an initial state of the Promise before an operation begins
2. **Fulfilled:** This state indicates that the specified operation was completed.
3. **Rejected:** This state indicates that the operation did not complete. In this case an error value will be thrown.
**[⬆ Back to Top](#table-of-contents)**
54. ### What is a callback function
A callback function is a function passed into another function as an argument. This function is invoked inside the outer function to complete an action.
Let's take a simple example of how to use callback function
```javascript
function callbackFunction(name) {
console.log("Hello " + name);
}
function outerFunction(callback) {
let name = prompt("Please enter your name.");
callback(name);
}
outerFunction(callbackFunction);
```
**[⬆ Back to Top](#table-of-contents)**
55. ### Why do we need callbacks
The callbacks are needed because javascript is an event driven language. That means instead of waiting for a response javascript will keep executing while listening for other events.
Let's take an example with the first function invoking an API call(simulated by setTimeout) and the next function which logs the message.
```javascript
function firstFunction() {
// Simulate a code delay
setTimeout(function () {
console.log("First function called");
}, 1000);
}
function secondFunction() {
console.log("Second function called");
}
firstFunction();
secondFunction();
Output;
// Second function called
// First function called
```
As observed from the output, javascript didn't wait for the response of the first function and the remaining code block got executed. So callbacks are used in a way to make sure that certain code doesn’t execute until the other code finishes execution.
**[⬆ Back to Top](#table-of-contents)**
56. ### What is a callback hell
Callback Hell is an anti-pattern with multiple nested callbacks which makes code hard to read and debug when dealing with asynchronous logic. The callback hell looks like below,
```javascript
async1(function(){
async2(function(){
async3(function(){
async4(function(){
....
});
});
});
});
```
**[⬆ Back to Top](#table-of-contents)**
57. ### What are server-sent events
Server-sent events (SSE) is a server push technology enabling a browser to receive automatic updates from a server via HTTP connection without resorting to polling. These are a one way communications channel - events flow from server to client only. This has been used in Facebook/Twitter updates, stock price updates, news feeds etc.
**[⬆ Back to Top](#table-of-contents)**
58. ### How do you receive server-sent event notifications
The EventSource object is used to receive server-sent event notifications. For example, you can receive messages from server as below,
```javascript
if (typeof EventSource !== "undefined") {
var source = new EventSource("sse_generator.js");
source.onmessage = function (event) {
document.getElementById("output").innerHTML += event.data + "<br>";
};
}
```
**[⬆ Back to Top](#table-of-contents)**
59. ### How do you check browser support for server-sent events
You can perform browser support for server-sent events before using it as below,
```javascript
if (typeof EventSource !== "undefined") {
// Server-sent events supported. Let's have some code here!
} else {
// No server-sent events supported
}
```
**[⬆ Back to Top](#table-of-contents)**
60. ### What are the events available for server sent events
Below are the list of events available for server sent events
| Event | Description |
|---- | ---------
| onopen | It is used when a connection to the server is opened |
| onmessage | This event is used when a message is received |
| onerror | It happens when an error occurs|
**[⬆ Back to Top](#table-of-contents)**
61. ### What are the main rules of promise
A promise must follow a specific set of rules:
1. A promise is an object that supplies a standard-compliant `.then()` method
2. A pending promise may transition into either fulfilled or rejected state
3. A fulfilled or rejected promise is settled and it must not transition into any other state.
4. Once a promise is settled, the value must not change.
**[⬆ Back to Top](#table-of-contents)**
62. ### What is callback in callback
You can nest one callback inside in another callback to execute the actions sequentially one by one. This is known as callbacks in callbacks.
```javascript
loadScript("/script1.js", function (script) {
console.log("first script is loaded");
loadScript("/script2.js", function (script) {
console.log("second script is loaded");
loadScript("/script3.js", function (script) {
console.log("third script is loaded");
// after all scripts are loaded
});
});
});
```
**[⬆ Back to Top](#table-of-contents)**
63. ### What is promise chaining
The process of executing a sequence of asynchronous tasks one after another using promises is known as Promise chaining. Let's take an example of promise chaining for calculating the final result,
```javascript
new Promise(function (resolve, reject) {
setTimeout(() => resolve(1), 1000);
})
.then(function (result) {
console.log(result); // 1
return result * 2;
})
.then(function (result) {
console.log(result); // 2
return result * 3;
})
.then(function (result) {
console.log(result); // 6
return result * 4;
});
```
In the above handlers, the result is passed to the chain of .then() handlers with the below work flow,
1. The initial promise resolves in 1 second,
2. After that `.then` handler is called by logging the result(1) and then return a promise with the value of result \* 2.
3. After that the value passed to the next `.then` handler by logging the result(2) and return a promise with result \* 3.
4. Finally the value passed to the last `.then` handler by logging the result(6) and return a promise with result \* 4.
**[⬆ Back to Top](#table-of-contents)**
64. ### What is promise.all
Promise.all is a promise that takes an array of promises as an input (an iterable), and it gets resolved when all the promises get resolved or any one of them gets rejected. For example, the syntax of promise.all method is below,
```javascript
Promise.all([Promise1, Promise2, Promise3]) .then(result) => { console.log(result) }) .catch(error => console.log(`Error in promises ${error}`))
```
**Note:** Remember that the order of the promises(output the result) is maintained as per input order.
**[⬆ Back to Top](#table-of-contents)**
65. ### What is the purpose of the race method in promise
Promise.race() method will return the promise instance which is firstly resolved or rejected. Let's take an example of race() method where promise2 is resolved first
```javascript
var promise1 = new Promise(function (resolve, reject) {
setTimeout(resolve, 500, "one");
});
var promise2 = new Promise(function (resolve, reject) {
setTimeout(resolve, 100, "two");
});
Promise.race([promise1, promise2]).then(function (value) {
console.log(value); // "two" // Both promises will resolve, but promise2 is faster
});
```
**[⬆ Back to Top](#table-of-contents)**
66. ### What is a strict mode in javascript
Strict Mode is a new feature in ECMAScript 5 that allows you to place a program, or a function, in a “strict” operating context. This way it prevents certain actions from being taken and throws more exceptions. The literal expression `"use strict";` instructs the browser to use the javascript code in the Strict mode.
**[⬆ Back to Top](#table-of-contents)**
67. ### Why do you need strict mode
Strict mode is useful to write "secure" JavaScript by notifying "bad syntax" into real errors. For example, it eliminates accidentally creating a global variable by throwing an error and also throws an error for assignment to a non-writable property, a getter-only property, a non-existing property, a non-existing variable, or a non-existing object.
**[⬆ Back to Top](#table-of-contents)**
68. ### How do you declare strict mode
The strict mode is declared by adding "use strict"; to the beginning of a script or a function.
If declared at the beginning of a script, it has global scope.
```javascript
"use strict";
x = 3.14; // This will cause an error because x is not declared
```
and if you declare inside a function, it has local scope
```javascript
x = 3.14; // This will not cause an error.
myFunction();
function myFunction() {
"use strict";
y = 3.14; // This will cause an error
}
```
**[⬆ Back to Top](#table-of-contents)**
69. ### What is the purpose of double exclamation
The double exclamation or negation(!!) ensures the resulting type is a boolean. If it was falsey (e.g. 0, null, undefined, etc.), it will be false, otherwise, it will be true.
For example, you can test IE version using this expression as below,
```javascript
let isIE8 = false;
isIE8 = !!navigator.userAgent.match(/MSIE 8.0/);
console.log(isIE8); // returns true or false
```
If you don't use this expression then it returns the original value.
```javascript
console.log(navigator.userAgent.match(/MSIE 8.0/)); // returns either an Array or null
```
**Note:** The expression !! is not an operator, but it is just twice of ! operator.
**[⬆ Back to Top](#table-of-contents)**
70. ### What is the purpose of the delete operator
The delete operator is used to delete the property as well as its value.
```javascript
var user = { firstName: "John", lastName:"Doe", age: 20 };
delete user.age;
console.log(user); // {firstName: "John", lastName:"Doe"}
```
**[⬆ Back to Top](#table-of-contents)**
71. ### What is typeof operator
You can use the JavaScript typeof operator to find the type of a JavaScript variable. It returns the type of a variable or an expression.
```javascript
typeof "John Abraham"; // Returns "string"
typeof (1 + 2); // Returns "number"
typeof [1, 2, 3]; // Returns "object" because all arrays are also objects
```
**[⬆ Back to Top](#table-of-contents)**
72. ### What is undefined property
The undefined property indicates that a variable has not been assigned a value, or declared but not initialized at all. The type of undefined value is undefined too.
```javascript
var user; // Value is undefined, type is undefined
console.log(typeof user); //undefined
```
Any variable can be emptied by setting the value to undefined.
```javascript
user = undefined;
```
**[⬆ Back to Top](#table-of-contents)**
73. ### What is null value
The value null represents the intentional absence of any object value. It is one of JavaScript's primitive values. The type of null value is object.
You can empty the variable by setting the value to null.
```javascript
var user = null;
console.log(typeof user); //object
```
**[⬆ Back to Top](#table-of-contents)**
74. ### What is the difference between null and undefined
Below are the main differences between null and undefined,
| Null | Undefined |
| ----------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------- |
| It is an assignment value which indicates that variable points to no object. | It is not an assignment value where a variable has been declared but has not yet been assigned a value. |
| Type of null is object | Type of undefined is undefined |
| The null value is a primitive value that represents the null, empty, or non-existent reference. | The undefined value is a primitive value used when a variable has not been assigned a value. |
| Indicates the absence of a value for a variable | Indicates absence of variable itself |
| Converted to zero (0) while performing primitive operations | Converted to NaN while performing primitive operations |
**[⬆ Back to Top](#table-of-contents)**
75. ### What is eval
The eval() function evaluates JavaScript code represented as a string. The string can be a JavaScript expression, variable, statement, or sequence of statements.
```javascript
console.log(eval("1 + 2")); // 3
```
**[⬆ Back to Top](#table-of-contents)**
76. ### What is the difference between window and document
Below are the main differences between window and document,
| Window | Document |
| ----------------------------------------------------------------------------- | --------------------------------------------------------------------------------------------- |
| It is the root level element in any web page | It is the direct child of the window object. This is also known as Document Object Model(DOM) |
| By default window object is available implicitly in the page | You can access it via window.document or document. |
| It has methods like alert(), confirm() and properties like document, location | It provides methods like getElementById, getElementsByTagName, createElement etc |
**[⬆ Back to Top](#table-of-contents)**
77. ### How do you access history in javascript
The window.history object contains the browser's history. You can load previous and next URLs in the history using back() and next() methods.
```javascript
function goBack() {
window.history.back();
}
function goForward() {
window.history.forward();
}
```
**Note:** You can also access history without window prefix.
**[⬆ Back to Top](#table-of-contents)**
78. ### How do you detect caps lock key turned on or not
The `mouseEvent getModifierState()` is used to return a boolean value that indicates whether the specified modifier key is activated or not. The modifiers such as CapsLock, ScrollLock and NumLock are activated when they are clicked, and deactivated when they are clicked again.
Let's take an input element to detect the CapsLock on/off behavior with an example,
```html
<input type="password" onmousedown="enterInput(event)" />
<p id="feedback"></p>
<script>
function enterInput(e) {
var flag = e.getModifierState("CapsLock");
if (flag) {
document.getElementById("feedback").innerHTML = "CapsLock activated";
} else {
document.getElementById("feedback").innerHTML =
"CapsLock not activated";
}
}
</script>
```
**[⬆ Back to Top](#table-of-contents)**
79. ### What is isNaN
The isNaN() function is used to determine whether a value is an illegal number (Not-a-Number) or not. i.e, This function returns true if the value equates to NaN. Otherwise it returns false.
```javascript
isNaN("Hello"); //true
isNaN("100"); //false
```
**[⬆ Back to Top](#table-of-contents)**
80. ### What are the differences between undeclared and undefined variables
Below are the major differences between undeclared(not defined) and undefined variables,
| undeclared | undefined |
| ------------------------------------------------------------------------------------------- | -------------------------------------------------------------------------------------- |
| These variables do not exist in a program and are not declared | These variables declared in the program but have not assigned any value |
| If you try to read the value of an undeclared variable, then a runtime error is encountered | If you try to read the value of an undefined variable, an undefined value is returned. |
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81. ### What are global variables
Global variables are those that are available throughout the length of the code without any scope. The var keyword is used to declare a local variable but if you omit it then it will become global variable
```javascript
msg = "Hello"; // var is missing, it becomes global variable
```
**[⬆ Back to Top](#table-of-contents)**
82. ### What are the problems with global variables
The problem with global variables is the conflict of variable names of local and global scope. It is also difficult to debug and test the code that relies on global variables.
**[⬆ Back to Top](#table-of-contents)**
83. ### What is NaN property
The NaN property is a global property that represents "Not-a-Number" value. i.e, It indicates that a value is not a legal number. It is very rare to use NaN in a program but it can be used as return value for few cases
```javascript
Math.sqrt(-1);
parseInt("Hello");
```
**[⬆ Back to Top](#table-of-contents)**
84. ### What is the purpose of isFinite function
The isFinite() function is used to determine whether a number is a finite, legal number. It returns false if the value is +infinity, -infinity, or NaN (Not-a-Number), otherwise it returns true.
```javascript
isFinite(Infinity); // false
isFinite(NaN); // false
isFinite(-Infinity); // false
isFinite(100); // true
```
**[⬆ Back to Top](#table-of-contents)**
85. ### What is an event flow
Event flow is the order in which event is received on the web page. When you click an element that is nested in various other elements, before your click actually reaches its destination, or target element, it must trigger the click event for each of its parent elements first, starting at the top with the global window object.
There are two ways of event flow
1. Top to Bottom(Event Capturing)
2. Bottom to Top (Event Bubbling)
**[⬆ Back to Top](#table-of-contents)**
86. ### What is event bubbling
Event bubbling is a type of event propagation where the event first triggers on the innermost target element, and then successively triggers on the ancestors (parents) of the target element in the same nesting hierarchy till it reaches the outermost DOM element.
**[⬆ Back to Top](#table-of-contents)**
87. ### What is event capturing
Event capturing is a type of event propagation where the event is first captured by the outermost element, and then successively triggers on the descendants (children) of the target element in the same nesting hierarchy till it reaches the innermost DOM element.
**[⬆ Back to Top](#table-of-contents)**
88. ### How do you submit a form using JavaScript
You can submit a form using `document.forms[0].submit()`. All the form input's information is submitted using onsubmit event handler
```javascript
function submit() {
document.forms[0].submit();
}
```
**[⬆ Back to Top](#table-of-contents)**
89. ### How do you find operating system details
The window.navigator object contains information about the visitor's browser OS details. Some of the OS properties are available under platform property,
```javascript
console.log(navigator.platform);
```
**[⬆ Back to Top](#table-of-contents)**
90. ### What is the difference between document load and DOMContentLoaded events
The `DOMContentLoaded` event is fired when the initial HTML document has been completely loaded and parsed, without waiting for assets(stylesheets, images, and subframes) to finish loading. Whereas The load event is fired when the whole page has loaded, including all dependent resources(stylesheets, images).
**[⬆ Back to Top](#table-of-contents)**
91. ### What is the difference between native, host and user objects
`Native objects` are objects that are part of the JavaScript language defined by the ECMAScript specification. For example, String, Math, RegExp, Object, Function etc core objects defined in the ECMAScript spec.
`Host objects` are objects provided by the browser or runtime environment (Node). For example, window, XmlHttpRequest, DOM nodes etc are considered as host objects.
`User objects` are objects defined in the javascript code. For example, User objects created for profile information.
**[⬆ Back to Top](#table-of-contents)**
92. ### What are the tools or techniques used for debugging JavaScript code
You can use below tools or techniques for debugging javascript
1. Chrome Devtools
2. debugger statement
3. Good old console.log statement
**[⬆ Back to Top](#table-of-contents)**
93. ### What are the pros and cons of promises over callbacks
Below are the list of pros and cons of promises over callbacks,
**Pros:**
1. It avoids callback hell which is unreadable
2. Easy to write sequential asynchronous code with .then()
3. Easy to write parallel asynchronous code with Promise.all()
4. Solves some of the common problems of callbacks(call the callback too late, too early, many times and swallow errors/exceptions)
**Cons:**
1. It makes little complex code
2. You need to load a polyfill if ES6 is not supported
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94. ### What is the difference between an attribute and a property
Attributes are defined on the HTML markup whereas properties are defined on the DOM. For example, the below HTML element has 2 attributes type and value,
```javascript
<input type="text" value="Name:">
```
You can retrieve the attribute value as below,
```javascript
const input = document.querySelector("input");
console.log(input.getAttribute("value")); // Good morning
console.log(input.value); // Good morning
```
And after you change the value of the text field to "Good evening", it becomes like
```javascript
console.log(input.getAttribute("value")); // Good evening
console.log(input.value); // Good evening
```
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95. ### What is same-origin policy
The same-origin policy is a policy that prevents JavaScript from making requests across domain boundaries. An origin is defined as a combination of URI scheme, hostname, and port number. If you enable this policy then it prevents a malicious script on one page from obtaining access to sensitive data on another web page using Document Object Model(DOM).
**[⬆ Back to Top](#table-of-contents)**
96. ### What is the purpose of void 0
Void(0) is used to prevent the page from refreshing. This will be helpful to eliminate the unwanted side-effect, because it will return the undefined primitive value. It is commonly used for HTML documents that use href="JavaScript:Void(0);" within an `<a>` element. i.e, when you click a link, the browser loads a new page or refreshes the same page. But this behavior will be prevented using this expression.
For example, the below link notify the message without reloading the page
```javascript
<a href="JavaScript:void(0);" onclick="alert('Well done!')">
Click Me!
</a>
```
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97. ### Is JavaScript a compiled or interpreted language
JavaScript is an interpreted language, not a compiled language. An interpreter in the browser reads over the JavaScript code, interprets each line, and runs it. Nowadays modern browsers use a technology known as Just-In-Time (JIT) compilation, which compiles JavaScript to executable bytecode just as it is about to run.
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98. ### Is JavaScript a case-sensitive language
Yes, JavaScript is a case sensitive language. The language keywords, variables, function & object names, and any other identifiers must always be typed with a consistent capitalization of letters.
**[⬆ Back to Top](#table-of-contents)**
99. ### Is there any relation between Java and JavaScript
No, they are entirely two different programming languages and have nothing to do with each other. But both of them are Object Oriented Programming languages and like many other languages, they follow similar syntax for basic features(if, else, for, switch, break, continue etc).
**[⬆ Back to Top](#table-of-contents)**
100. ### What are events
Events are "things" that happen to HTML elements. When JavaScript is used in HTML pages, JavaScript can `react` on these events. Some of the examples of HTML events are,
1. Web page has finished loading
2. Input field was changed
3. Button was clicked
Let's describe the behavior of click event for button element,
```javascript
<!doctype html>
<html>
<head>
<script>
function greeting() {
alert('Hello! Good morning');
}
</script>
</head>
<body>
<button type="button" onclick="greeting()">Click me</button>
</body>
</html>
```
**[⬆ Back to Top](#table-of-contents)**
101. ### Who created javascript
JavaScript was created by Brendan Eich in 1995 during his time at Netscape Communications. Initially it was developed under the name `Mocha`, but later the language was officially called `LiveScript` when it first shipped in beta releases of Netscape.
**[⬆ Back to Top](#table-of-contents)**
102. ### What is the use of preventDefault method
The preventDefault() method cancels the event if it is cancelable, meaning that the default action or behaviour that belongs to the event will not occur. For example, prevent form submission when clicking on submit button and prevent opening the page URL when clicking on hyperlink are some common use cases.
```javascript
document
.getElementById("link")
.addEventListener("click", function (event) {
event.preventDefault();
});
```
**Note:** Remember that not all events are cancelable.
**[⬆ Back to Top](#table-of-contents)**
103. ### What is the use of stopPropagation method
The stopPropagation method is used to stop the event from bubbling up the event chain. For example, the below nested divs with stopPropagation method prevents default event propagation when clicking on nested div(Div1)
```javascript
<p>Click DIV1 Element</p>
<div onclick="secondFunc()">DIV 2
<div onclick="firstFunc(event)">DIV 1</div>
</div>
<script>
function firstFunc(event) {
alert("DIV 1");
event.stopPropagation();
}
function secondFunc() {
alert("DIV 2");
}
</script>
```
**[⬆ Back to Top](#table-of-contents)**
104. ### What are the steps involved in return false usage
The return false statement in event handlers performs the below steps,
1. First it stops the browser's default action or behaviour.
2. It prevents the event from propagating the DOM
3. Stops callback execution and returns immediately when called.
**[⬆ Back to Top](#table-of-contents)**
105. ### What is BOM
The Browser Object Model (BOM) allows JavaScript to "talk to" the browser. It consists of the objects navigator, history, screen, location and document which are children of the window. The Browser Object Model is not standardized and can change based on different browsers.
**[⬆ Back to Top](#table-of-contents)**
106. ### What is the use of setTimeout
The setTimeout() method is used to call a function or evaluate an expression after a specified number of milliseconds. For example, let's log a message after 2 seconds using setTimeout method,
```javascript
setTimeout(function () {
console.log("Good morning");
}, 2000);
```
**[⬆ Back to Top](#table-of-contents)**
107. ### What is the use of setInterval
The setInterval() method is used to call a function or evaluate an expression at specified intervals (in milliseconds). For example, let's log a message after 2 seconds using setInterval method,
```javascript
setInterval(function () {
console.log("Good morning");
}, 2000);
```
**[⬆ Back to Top](#table-of-contents)**
108. ### Why is JavaScript treated as Single threaded
JavaScript is a single-threaded language. Because the language specification does not allow the programmer to write code so that the interpreter can run parts of it in parallel in multiple threads or processes. Whereas languages like java, go, C++ can make multi-threaded and multi-process programs.
**[⬆ Back to Top](#table-of-contents)**
109. ### What is an event delegation
Event delegation is a technique for listening to events where you delegate a parent element as the listener for all of the events that happen inside it.
For example, if you wanted to detect field changes in inside a specific form, you can use event delegation technique,
```javascript
var form = document.querySelector("#registration-form");
// Listen for changes to fields inside the form
form.addEventListener(
"input",
function (event) {
// Log the field that was changed
console.log(event.target);
},
false
);
```
**[⬆ Back to Top](#table-of-contents)**
110. ### What is ECMAScript
ECMAScript is the scripting language that forms the basis of JavaScript. ECMAScript standardized by the ECMA International standards organization in the ECMA-262 and ECMA-402 specifications. The first edition of ECMAScript was released in 1997.
**[⬆ Back to Top](#table-of-contents)**
111. ### What is JSON
JSON (JavaScript Object Notation) is a lightweight format that is used for data interchanging. It is based on a subset of JavaScript language in the way objects are built in JavaScript.
**[⬆ Back to Top](#table-of-contents)**
112. ### What are the syntax rules of JSON
Below are the list of syntax rules of JSON
1. The data is in name/value pairs
2. The data is separated by commas
3. Curly braces hold objects
4. Square brackets hold arrays
**[⬆ Back to Top](#table-of-contents)**
113. ### What is the purpose JSON stringify
When sending data to a web server, the data has to be in a string format. You can achieve this by converting JSON object into a string using stringify() method.
```javascript
var userJSON = { name: "John", age: 31 };
var userString = JSON.stringify(userJSON);
console.log(userString); //"{"name":"John","age":31}"
```
**[⬆ Back to Top](#table-of-contents)**
114. ### How do you parse JSON string
When receiving the data from a web server, the data is always in a string format. But you can convert this string value to a javascript object using parse() method.
```javascript
var userString = '{"name":"John","age":31}';
var userJSON = JSON.parse(userString);
console.log(userJSON); // {name: "John", age: 31}
```
**[⬆ Back to Top](#table-of-contents)**
115. ### Why do you need JSON
When exchanging data between a browser and a server, the data can only be text. Since JSON is text only, it can easily be sent to and from a server, and used as a data format by any programming language.
**[⬆ Back to Top](#table-of-contents)**
116. ### What are PWAs
Progressive web applications (PWAs) are a type of mobile app delivered through the web, built using common web technologies including HTML, CSS and JavaScript. These PWAs are deployed to servers, accessible through URLs, and indexed by search engines.
**[⬆ Back to Top](#table-of-contents)**
117. ### What is the purpose of clearTimeout method
The clearTimeout() function is used in javascript to clear the timeout which has been set by setTimeout()function before that. i.e, The return value of setTimeout() function is stored in a variable and it’s passed into the clearTimeout() function to clear the timer.
For example, the below setTimeout method is used to display the message after 3 seconds. This timeout can be cleared by the clearTimeout() method.
```javascript
<script>
var msg;
function greeting() {
alert('Good morning');
}
function start() {
msg =setTimeout(greeting, 3000);
}
function stop() {
clearTimeout(msg);
}
</script>
```
**[⬆ Back to Top](#table-of-contents)**
118. ### What is the purpose of clearInterval method
The clearInterval() function is used in javascript to clear the interval which has been set by setInterval() function. i.e, The return value returned by setInterval() function is stored in a variable and it’s passed into the clearInterval() function to clear the interval.
For example, the below setInterval method is used to display the message for every 3 seconds. This interval can be cleared by the clearInterval() method.
```javascript
<script>
var msg;
function greeting() {
alert('Good morning');
}
function start() {
msg = setInterval(greeting, 3000);
}
function stop() {
clearInterval(msg);
}
</script>
```
**[⬆ Back to Top](#table-of-contents)**
119. ### How do you redirect new page in javascript
In vanilla javascript, you can redirect to a new page using the `location` property of window object. The syntax would be as follows,
```javascript
function redirect() {
window.location.href = "newPage.html";
}
```
**[⬆ Back to Top](#table-of-contents)**
120. ### How do you check whether a string contains a substring
There are 3 possible ways to check whether a string contains a substring or not,
1. **Using includes:** ES6 provided `String.prototype.includes` method to test a string contains a substring
```javascript
var mainString = "hello",
subString = "hell";
mainString.includes(subString);
```
1. **Using indexOf:** In an ES5 or older environment, you can use `String.prototype.indexOf` which returns the index of a substring. If the index value is not equal to -1 then it means the substring exists in the main string.
```javascript
var mainString = "hello",
subString = "hell";
mainString.indexOf(subString) !== -1;
```
1. **Using RegEx:** The advanced solution is using Regular expression's test method(`RegExp.test`), which allows for testing for against regular expressions
```javascript
var mainString = "hello",
regex = /hell/;
regex.test(mainString);
```
**[⬆ Back to Top](#table-of-contents)**
121. ### How do you validate an email in javascript
You can validate an email in javascript using regular expressions. It is recommended to do validations on the server side instead of the client side. Because the javascript can be disabled on the client side.
```javascript
function validateEmail(email) {
var re =
/^(([^<>()\[\]\\.,;:\s@"]+(\.[^<>()\[\]\\.,;:\s@"]+)*)|(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;
return re.test(String(email).toLowerCase());
}
```
**[⬆ Back to Top](#table-of-contents)**
The above regular expression accepts unicode characters.
122. ### How do you get the current url with javascript
You can use `window.location.href` expression to get the current url path and you can use the same expression for updating the URL too. You can also use `document.URL` for read-only purposes but this solution has issues in FF.
```javascript
console.log("location.href", window.location.href); // Returns full URL
```
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123. ### What are the various url properties of location object
The below `Location` object properties can be used to access URL components of the page,
1. href - The entire URL
2. protocol - The protocol of the URL
3. host - The hostname and port of the URL
4. hostname - The hostname of the URL
5. port - The port number in the URL
6. pathname - The path name of the URL
7. search - The query portion of the URL
8. hash - The anchor portion of the URL
**[⬆ Back to Top](#table-of-contents)**
124. ### How do get query string values in javascript
You can use URLSearchParams to get query string values in javascript. Let's see an example to get the client code value from URL query string,
```javascript
const urlParams = new URLSearchParams(window.location.search);
const clientCode = urlParams.get("clientCode");
```
**[⬆ Back to Top](#table-of-contents)**
125. ### How do you check if a key exists in an object
You can check whether a key exists in an object or not using three approaches,
1. **Using in operator:** You can use the in operator whether a key exists in an object or not
```javascript
"key" in obj;
```
and If you want to check if a key doesn't exist, remember to use parenthesis,
```javascript
!("key" in obj);
```
1. **Using hasOwnProperty method:** You can use `hasOwnProperty` to particularly test for properties of the object instance (and not inherited properties)
```javascript
obj.hasOwnProperty("key"); // true
```
1. **Using undefined comparison:** If you access a non-existing property from an object, the result is undefined. Let’s compare the properties against undefined to determine the existence of the property.
```javascript
const user = {
name: "John",
};
console.log(user.name !== undefined); // true
console.log(user.nickName !== undefined); // false
```
**[⬆ Back to Top](#table-of-contents)**
126. ### How do you loop through or enumerate javascript object
You can use the `for-in` loop to loop through javascript object. You can also make sure that the key you get is an actual property of an object, and doesn't come from the prototype using `hasOwnProperty` method.
```javascript
var object = {
k1: "value1",
k2: "value2",
k3: "value3",
};
for (var key in object) {
if (object.hasOwnProperty(key)) {
console.log(key + " -> " + object[key]); // k1 -> value1 ...
}
}
```
**[⬆ Back to Top](#table-of-contents)**
127. ### How do you test for an empty object
There are different solutions based on ECMAScript versions
1. **Using Object entries(ECMA 7+):** You can use object entries length along with constructor type.
```javascript
Object.entries(obj).length === 0 && obj.constructor === Object; // Since date object length is 0, you need to check constructor check as well
```
1. **Using Object keys(ECMA 5+):** You can use object keys length along with constructor type.
```javascript
Object.keys(obj).length === 0 && obj.constructor === Object; // Since date object length is 0, you need to check constructor check as well
```
1. **Using for-in with hasOwnProperty(Pre-ECMA 5):** You can use a for-in loop along with hasOwnProperty.
```javascript
function isEmpty(obj) {
for (var prop in obj) {
if (obj.hasOwnProperty(prop)) {
return false;
}
}
return JSON.stringify(obj) === JSON.stringify({});
}
```
**[⬆ Back to Top](#table-of-contents)**
128. ### What is an arguments object
The arguments object is an Array-like object accessible inside functions that contains the values of the arguments passed to that function. For example, let's see how to use arguments object inside sum function,
```javascript
function sum() {
var total = 0;
for (var i = 0, len = arguments.length; i < len; ++i) {
total += arguments[i];
}
return total;
}
sum(1, 2, 3); // returns 6
```
**Note:** You can't apply array methods on arguments object. But you can convert into a regular array as below.
```javascript
var argsArray = Array.prototype.slice.call(arguments);
```
**[⬆ Back to Top](#table-of-contents)**
129. ### How do you make first letter of the string in an uppercase
You can create a function which uses a chain of string methods such as charAt, toUpperCase and slice methods to generate a string with the first letter in uppercase.
```javascript
function capitalizeFirstLetter(string) {
return string.charAt(0).toUpperCase() + string.slice(1);
}
```
**[⬆ Back to Top](#table-of-contents)**
130. ### What are the pros and cons of for loop
The for-loop is a commonly used iteration syntax in javascript. It has both pros and cons
#### Pros
1. Works on every environment
2. You can use break and continue flow control statements
#### Cons
1. Too verbose
2. Imperative
3. You might face one-by-off errors
**[⬆ Back to Top](#table-of-contents)**
131. ### How do you display the current date in javascript
You can use `new Date()` to generate a new Date object containing the current date and time. For example, let's display the current date in mm/dd/yyyy
```javascript
var today = new Date();
var dd = String(today.getDate()).padStart(2, "0");
var mm = String(today.getMonth() + 1).padStart(2, "0"); //January is 0!
var yyyy = today.getFullYear();
today = mm + "/" + dd + "/" + yyyy;
document.write(today);
```
**[⬆ Back to Top](#table-of-contents)**
132. ### How do you compare two date objects
You need to use date.getTime() method to compare date values instead of comparison operators (==, !=, ===, and !== operators)
```javascript
var d1 = new Date();
var d2 = new Date(d1);
console.log(d1.getTime() === d2.getTime()); //True
console.log(d1 === d2); // False
```
**[⬆ Back to Top](#table-of-contents)**
133. ### How do you check if a string starts with another string
You can use ECMAScript 6's `String.prototype.startsWith()` method to check if a string starts with another string or not. But it is not yet supported in all browsers. Let's see an example to see this usage,
```javascript
"Good morning".startsWith("Good"); // true
"Good morning".startsWith("morning"); // false
```
**[⬆ Back to Top](#table-of-contents)**
134. ### How do you trim a string in javascript
JavaScript provided a trim method on string types to trim any whitespaces present at the beginning or ending of the string.
```javascript
" Hello World ".trim(); //Hello World
```
If your browser(<IE9) doesn't support this method then you can use below polyfill.
```javascript
if (!String.prototype.trim) {
(function () {
// Make sure we trim BOM and NBSP
var rtrim = /^[\s\uFEFF\xA0]+|[\s\uFEFF\xA0]+$/g;
String.prototype.trim = function () {
return this.replace(rtrim, "");
};
})();
}
```
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135. ### How do you add a key value pair in javascript
There are two possible solutions to add new properties to an object. Let's take a simple object to explain these solutions.
```javascript
var object = {
key1: value1,
key2: value2,
};
```
1. **Using dot notation:** This solution is useful when you know the name of the property
```javascript
object.key3 = "value3";
```
1. **Using square bracket notation:** This solution is useful when the name of the property is dynamically determined.
```javascript
obj["key3"] = "value3";
```
**[⬆ Back to Top](#table-of-contents)**
136. ### Is the !-- notation represents a special operator
No,that's not a special operator. But it is a combination of 2 standard operators one after the other,
1. A logical not (!)
2. A prefix decrement (--)
At first, the value decremented by one and then tested to see if it is equal to zero or not for determining the truthy/falsy value.
**[⬆ Back to Top](#table-of-contents)**
137. ### How do you assign default values to variables
You can use the logical or operator `||` in an assignment expression to provide a default value. The syntax looks like as below,
```javascript
var a = b || c;
```
As per the above expression, variable 'a 'will get the value of 'c' only if 'b' is falsy (if is null, false, undefined, 0, empty string, or NaN), otherwise 'a' will get the value of 'b'.
**[⬆ Back to Top](#table-of-contents)**
138. ### How do you define multiline strings
You can define multiline string literals using the '\\' character followed by line terminator.
```javascript
var str =
"This is a \
very lengthy \
sentence!";
```
But if you have a space after the '\\' character, the code will look exactly the same, but it will raise a SyntaxError.
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139. ### What is an app shell model
An application shell (or app shell) architecture is one way to build a Progressive Web App that reliably and instantly loads on your users' screens, similar to what you see in native applications. It is useful for getting some initial HTML to the screen fast without a network.
**[⬆ Back to Top](#table-of-contents)**
140. ### Can we define properties for functions
Yes, We can define properties for functions because functions are also objects.
```javascript
fn = function (x) {
//Function code goes here
};
fn.name = "John";
fn.profile = function (y) {
//Profile code goes here
};
```
**[⬆ Back to Top](#table-of-contents)**
141. ### What is the way to find the number of parameters expected by a function
You can use `function.length` syntax to find the number of parameters expected by a function. Let's take an example of `sum` function to calculate the sum of numbers,
```javascript
function sum(num1, num2, num3, num4) {
return num1 + num2 + num3 + num4;
}
sum.length; // 4 is the number of parameters expected.
```
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142. ### What is a polyfill
A polyfill is a piece of JS code used to provide modern functionality on older browsers that do not natively support it. For example, Silverlight plugin polyfill can be used to mimic the functionality of an HTML Canvas element on Microsoft Internet Explorer 7.
**[⬆ Back to Top](#table-of-contents)**
143. ### What are break and continue statements
The break statement is used to "jump out" of a loop. i.e, It breaks the loop and continues executing the code after the loop.
```javascript
for (i = 0; i < 10; i++) {
if (i === 5) {
break;
}
text += "Number: " + i + "<br>";
}
```
The continue statement is used to "jump over" one iteration in the loop. i.e, It breaks one iteration (in the loop), if a specified condition occurs, and continues with the next iteration in the loop.
```javascript
for (i = 0; i < 10; i++) {
if (i === 5) {
continue;
}
text += "Number: " + i + "<br>";
}
```
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144. ### What are js labels
The label statement allows us to name loops and blocks in JavaScript. We can then use these labels to refer back to the code later. For example, the below code with labels avoids printing the numbers when they are same,
```javascript
var i, j;
loop1: for (i = 0; i < 3; i++) {
loop2: for (j = 0; j < 3; j++) {
if (i === j) {
continue loop1;
}
console.log("i = " + i + ", j = " + j);
}
}
// Output is:
// "i = 1, j = 0"
// "i = 2, j = 0"
// "i = 2, j = 1"
```
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145. ### What are the benefits of keeping declarations at the top
It is recommended to keep all declarations at the top of each script or function. The benefits of doing this are,
1. Gives cleaner code
2. It provides a single place to look for local variables
3. Easy to avoid unwanted global variables
4. It reduces the possibility of unwanted re-declarations
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146. ### What are the benefits of initializing variables
It is recommended to initialize variables because of the below benefits,
1. It gives cleaner code
2. It provides a single place to initialize variables
3. Avoid undefined values in the code
**[⬆ Back to Top](#table-of-contents)**
147. ### What are the recommendations to create new object
It is recommended to avoid creating new objects using `new Object()`. Instead you can initialize values based on it's type to create the objects.
1. Assign {} instead of new Object()
2. Assign "" instead of new String()
3. Assign 0 instead of new Number()
4. Assign false instead of new Boolean()
5. Assign [] instead of new Array()
6. Assign /()/ instead of new RegExp()
7. Assign function (){} instead of new Function()
You can define them as an example,
```javascript
var v1 = {};
var v2 = "";
var v3 = 0;
var v4 = false;
var v5 = [];
var v6 = /()/;
var v7 = function () {};
```
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148. ### How do you define JSON arrays
JSON arrays are written inside square brackets and arrays contain javascript objects. For example, the JSON array of users would be as below,
```javascript
"users":[
{"firstName":"John", "lastName":"Abrahm"},
{"firstName":"Anna", "lastName":"Smith"},
{"firstName":"Shane", "lastName":"Warn"}
]
```
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149. ### How do you generate random integers
You can use Math.random() with Math.floor() to return random integers. For example, if you want generate random integers between 1 to 10, the multiplication factor should be 10,
```javascript
Math.floor(Math.random() * 10) + 1; // returns a random integer from 1 to 10
Math.floor(Math.random() * 100) + 1; // returns a random integer from 1 to 100
```
**Note:** Math.random() returns a random number between 0 (inclusive), and 1 (exclusive)
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150. ### Can you write a random integers function to print integers with in a range
Yes, you can create a proper random function to return a random number between min and max (both included)
```javascript
function randomInteger(min, max) {
return Math.floor(Math.random() * (max - min + 1)) + min;
}
randomInteger(1, 100); // returns a random integer from 1 to 100
randomInteger(1, 1000); // returns a random integer from 1 to 1000
```
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151. ### What is tree shaking
Tree shaking is a form of dead code elimination. It means that unused modules will not be included in the bundle during the build process and for that it relies on the static structure of ES2015 module syntax,( i.e. import and export). Initially this has been popularized by the ES2015 module bundler `rollup`.
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152. ### What is the need of tree shaking
Tree Shaking can significantly reduce the code size in any application. i.e, The less code we send over the wire the more performant the application will be. For example, if we just want to create a “Hello World” Application using SPA frameworks then it will take around a few MBs, but by tree shaking it can bring down the size to just a few hundred KBs. Tree shaking is implemented in Rollup and Webpack bundlers.
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153. ### Is it recommended to use eval
No, it allows arbitrary code to be run which causes a security problem. As we know that the eval() function is used to run text as code. In most of the cases, it should not be necessary to use it.
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154. ### What is a Regular Expression
A regular expression is a sequence of characters that forms a search pattern. You can use this search pattern for searching data in a text. These can be used to perform all types of text search and text replace operations. Let's see the syntax format now,
```javascript
/pattern/modifiers;
```
For example, the regular expression or search pattern with case-insensitive username would be,
```javascript
/John/i;
```
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155. ### What are the string methods available in Regular expression
Regular Expressions has two string methods: search() and replace().
The search() method uses an expression to search for a match, and returns the position of the match.
```javascript
var msg = "Hello John";
var n = msg.search(/John/i); // 6
```
The replace() method is used to return a modified string where the pattern is replaced.
```javascript
var msg = "Hello John";
var n = msg.replace(/John/i, "Buttler"); // Hello Buttler
```
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156. ### What are modifiers in regular expression
Modifiers can be used to perform case-insensitive and global searches. Let's list down some of the modifiers,
| Modifier | Description |
| -------- | ------------------------------------------------------- |
| i | Perform case-insensitive matching |
| g | Perform a global match rather than stops at first match |
| m | Perform multiline matching |
Let's take an example of global modifier,
```javascript
var text = "Learn JS one by one";
var pattern = /one/g;
var result = text.match(pattern); // one,one
```
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157. ### What are regular expression patterns
Regular Expressions provide a group of patterns in order to match characters. Basically they are categorized into 3 types,
1. **Brackets:** These are used to find a range of characters.
For example, below are some use cases,
1. [abc]: Used to find any of the characters between the brackets(a,b,c)
2. [0-9]: Used to find any of the digits between the brackets
3. (a|b): Used to find any of the alternatives separated with |
2. **Metacharacters:** These are characters with a special meaning
For example, below are some use cases,
1. \\d: Used to find a digit
2. \\s: Used to find a whitespace character
3. \\b: Used to find a match at the beginning or ending of a word
3. **Quantifiers:** These are useful to define quantities
For example, below are some use cases,
1. n+: Used to find matches for any string that contains at least one n
2. n\*: Used to find matches for any string that contains zero or more occurrences of n
3. n?: Used to find matches for any string that contains zero or one occurrences of n
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158. ### What is a RegExp object
RegExp object is a regular expression object with predefined properties and methods. Let's see the simple usage of RegExp object,
```javascript
var regexp = new RegExp("\\w+");
console.log(regexp);
// expected output: /\w+/
```
**[⬆ Back to Top](#table-of-contents)**
159. ### How do you search a string for a pattern
You can use the test() method of regular expression in order to search a string for a pattern, and return true or false depending on the result.
```javascript
var pattern = /you/;
console.log(pattern.test("How are you?")); //true
```
**[⬆ Back to Top](#table-of-contents)**
160. ### What is the purpose of exec method
The purpose of exec method is similar to test method but it executes a search for a match in a specified string and returns a result array, or null instead of returning true/false.
```javascript
var pattern = /you/;
console.log(pattern.exec("How are you?")); //["you", index: 8, input: "How are you?", groups: undefined]
```
**[⬆ Back to Top](#table-of-contents)**
161. ### How do you change the style of a HTML element
You can change inline style or classname of a HTML element using javascript
1. **Using style property:** You can modify inline style using style property
```javascript
document.getElementById("title").style.fontSize = "30px";
```
1. **Using ClassName property:** It is easy to modify element class using className property
```javascript
document.getElementById("title").className = "custom-title";
```
**[⬆ Back to Top](#table-of-contents)**
162. ### What would be the result of 1+2+'3'
The output is going to be `33`. Since `1` and `2` are numeric values, the result of the first two digits is going to be a numeric value `3`. The next digit is a string type value because of that the addition of numeric value `3` and string type value `3` is just going to be a concatenation value `33`.
**[⬆ Back to Top](#table-of-contents)**
163. ### What is a debugger statement
The debugger statement invokes any available debugging functionality, such as setting a breakpoint. If no debugging functionality is available, this statement has no effect.
For example, in the below function a debugger statement has been inserted. So
execution is paused at the debugger statement just like a breakpoint in the script source.
```javascript
function getProfile() {
// code goes here
debugger;
// code goes here
}
```
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164. ### What is the purpose of breakpoints in debugging
You can set breakpoints in the javascript code once the debugger statement is executed and the debugger window pops up. At each breakpoint, javascript will stop executing, and let you examine the JavaScript values. After examining values, you can resume the execution of code using the play button.
**[⬆ Back to Top](#table-of-contents)**
165. ### Can I use reserved words as identifiers
No, you cannot use the reserved words as variables, labels, object or function names. Let's see one simple example,
```javascript
var else = "hello"; // Uncaught SyntaxError: Unexpected token else
```
**[⬆ Back to Top](#table-of-contents)**
166. ### How do you detect a mobile browser
You can use regex which returns a true or false value depending on whether or not the user is browsing with a mobile.
```javascript
window.mobilecheck = function () {
var mobileCheck = false;
(function (a) {
if (
/(android|bb\d+|meego).+mobile|avantgo|bada\/|blackberry|blazer|compal|elaine|fennec|hiptop|iemobile|ip(hone|od)|iris|kindle|lge |maemo|midp|mmp|mobile.+firefox|netfront|opera m(ob|in)i|palm( os)?|phone|p(ixi|re)\/|plucker|pocket|psp|series(4|6)0|symbian|treo|up\.(browser|link)|vodafone|wap|windows ce|xda|xiino/i.test(
a
) ||
/1207|6310|6590|3gso|4thp|50[1-6]i|770s|802s|a wa|abac|ac(er|oo|s\-)|ai(ko|rn)|al(av|ca|co)|amoi|an(ex|ny|yw)|aptu|ar(ch|go)|as(te|us)|attw|au(di|\-m|r |s )|avan|be(ck|ll|nq)|bi(lb|rd)|bl(ac|az)|br(e|v)w|bumb|bw\-(n|u)|c55\/|capi|ccwa|cdm\-|cell|chtm|cldc|cmd\-|co(mp|nd)|craw|da(it|ll|ng)|dbte|dc\-s|devi|dica|dmob|do(c|p)o|ds(12|\-d)|el(49|ai)|em(l2|ul)|er(ic|k0)|esl8|ez([4-7]0|os|wa|ze)|fetc|fly(\-|_)|g1 u|g560|gene|gf\-5|g\-mo|go(\.w|od)|gr(ad|un)|haie|hcit|hd\-(m|p|t)|hei\-|hi(pt|ta)|hp( i|ip)|hs\-c|ht(c(\-| |_|a|g|p|s|t)|tp)|hu(aw|tc)|i\-(20|go|ma)|i230|iac( |\-|\/)|ibro|idea|ig01|ikom|im1k|inno|ipaq|iris|ja(t|v)a|jbro|jemu|jigs|kddi|keji|kgt( |\/)|klon|kpt |kwc\-|kyo(c|k)|le(no|xi)|lg( g|\/(k|l|u)|50|54|\-[a-w])|libw|lynx|m1\-w|m3ga|m50\/|ma(te|ui|xo)|mc(01|21|ca)|m\-cr|me(rc|ri)|mi(o8|oa|ts)|mmef|mo(01|02|bi|de|do|t(\-| |o|v)|zz)|mt(50|p1|v )|mwbp|mywa|n10[0-2]|n20[2-3]|n30(0|2)|n50(0|2|5)|n7(0(0|1)|10)|ne((c|m)\-|on|tf|wf|wg|wt)|nok(6|i)|nzph|o2im|op(ti|wv)|oran|owg1|p800|pan(a|d|t)|pdxg|pg(13|\-([1-8]|c))|phil|pire|pl(ay|uc)|pn\-2|po(ck|rt|se)|prox|psio|pt\-g|qa\-a|qc(07|12|21|32|60|\-[2-7]|i\-)|qtek|r380|r600|raks|rim9|ro(ve|zo)|s55\/|sa(ge|ma|mm|ms|ny|va)|sc(01|h\-|oo|p\-)|sdk\/|se(c(\-|0|1)|47|mc|nd|ri)|sgh\-|shar|sie(\-|m)|sk\-0|sl(45|id)|sm(al|ar|b3|it|t5)|so(ft|ny)|sp(01|h\-|v\-|v )|sy(01|mb)|t2(18|50)|t6(00|10|18)|ta(gt|lk)|tcl\-|tdg\-|tel(i|m)|tim\-|t\-mo|to(pl|sh)|ts(70|m\-|m3|m5)|tx\-9|up(\.b|g1|si)|utst|v400|v750|veri|vi(rg|te)|vk(40|5[0-3]|\-v)|vm40|voda|vulc|vx(52|53|60|61|70|80|81|83|85|98)|w3c(\-| )|webc|whit|wi(g |nc|nw)|wmlb|wonu|x700|yas\-|your|zeto|zte\-/i.test(
a.substr(0, 4)
)
)
mobileCheck = true;
})(navigator.userAgent || navigator.vendor || window.opera);
return mobileCheck;
};
```
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167. ### How do you detect a mobile browser without regexp
You can detect mobile browsers by simply running through a list of devices and checking if the useragent matches anything. This is an alternative solution for RegExp usage,
```javascript
function detectmob() {
if (
navigator.userAgent.match(/Android/i) ||
navigator.userAgent.match(/webOS/i) ||
navigator.userAgent.match(/iPhone/i) ||
navigator.userAgent.match(/iPad/i) ||
navigator.userAgent.match(/iPod/i) ||
navigator.userAgent.match(/BlackBerry/i) ||
navigator.userAgent.match(/Windows Phone/i)
) {
return true;
} else {
return false;
}
}
```
**[⬆ Back to Top](#table-of-contents)**
168. ### How do you get the image width and height using JS
You can programmatically get the image and check the dimensions(width and height) using Javascript.
```javascript
var img = new Image();
img.onload = function () {
console.log(this.width + "x" + this.height);
};
img.src = "http://www.google.com/intl/en_ALL/images/logo.gif";
```
**[⬆ Back to Top](#table-of-contents)**
169. ### How do you make synchronous HTTP request
Browsers provide an XMLHttpRequest object which can be used to make synchronous HTTP requests from JavaScript
```javascript
function httpGet(theUrl) {
var xmlHttpReq = new XMLHttpRequest();
xmlHttpReq.open("GET", theUrl, false); // false for synchronous request
xmlHttpReq.send(null);
return xmlHttpReq.responseText;
}
```
**[⬆ Back to Top](#table-of-contents)**
170. ### How do you make asynchronous HTTP request
Browsers provide an XMLHttpRequest object which can be used to make asynchronous HTTP requests from JavaScript by passing the 3rd parameter as true.
```javascript
function httpGetAsync(theUrl, callback) {
var xmlHttpReq = new XMLHttpRequest();
xmlHttpReq.onreadystatechange = function () {
if (xmlHttpReq.readyState == 4 && xmlHttpReq.status == 200)
callback(xmlHttpReq.responseText);
};
xmlHttp.open("GET", theUrl, true); // true for asynchronous
xmlHttp.send(null);
}
```
**[⬆ Back to Top](#table-of-contents)**
171. ### How do you convert date to another timezone in javascript
You can use the toLocaleString() method to convert dates in one timezone to another. For example, let's convert current date to British English timezone as below,
```javascript
console.log(event.toLocaleString("en-GB", { timeZone: "UTC" })); //29/06/2019, 09:56:00
```
**[⬆ Back to Top](#table-of-contents)**
172. ### What are the properties used to get size of window
You can use innerWidth, innerHeight, clientWidth, clientHeight properties of windows, document element and document body objects to find the size of a window. Let's use them combination of these properties to calculate the size of a window or document,
```javascript
var width =
window.innerWidth ||
document.documentElement.clientWidth ||
document.body.clientWidth;
var height =
window.innerHeight ||
document.documentElement.clientHeight ||
document.body.clientHeight;
```
**[⬆ Back to Top](#table-of-contents)**
173. ### What is a conditional operator in javascript
The conditional (ternary) operator is the only JavaScript operator that takes three operands which acts as a shortcut for if statements.
```javascript
var isAuthenticated = false;
console.log(
isAuthenticated ? "Hello, welcome" : "Sorry, you are not authenticated"
); //Sorry, you are not authenticated
```
**[⬆ Back to Top](#table-of-contents)**
174. ### Can you apply chaining on conditional operator
Yes, you can apply chaining on conditional operators similar to if … else if … else if … else chain. The syntax is going to be as below,
```javascript
function traceValue(someParam) {
return condition1
? value1
: condition2
? value2
: condition3
? value3
: value4;
}
// The above conditional operator is equivalent to:
function traceValue(someParam) {
if (condition1) {
return value1;
} else if (condition2) {
return value2;
} else if (condition3) {
return value3;
} else {
return value4;
}
}
```
**[⬆ Back to Top](#table-of-contents)**
175. ### What are the ways to execute javascript after page load
You can execute javascript after page load in many different ways,
1. **window.onload:**
```javascript
window.onload = function ...
```
1. **document.onload:**
```javascript
document.onload = function ...
```
1. **body onload:**
```javascript
<body onload="script();">
```
**[⬆ Back to Top](#table-of-contents)**
176. ### What is the difference between proto and prototype
The `__proto__` object is the actual object that is used in the lookup chain to resolve methods, etc. Whereas `prototype` is the object that is used to build `__proto__` when you create an object with new.
```javascript
new Employee().__proto__ === Employee.prototype;
new Employee().prototype === undefined;
```
There are few more differences,
| feature | Prototype | proto |
| ---------- | ------------------------------------------------------------ | ---------------------------------------------------------- |
| Access | All the function constructors have prototype properties. | All the objects have \_\_proto\_\_ property |
| Purpose | Used to reduce memory wastage with a single copy of function | Used in lookup chain to resolve methods, constructors etc. |
| ECMAScript | Introduced in ES6 | Introduced in ES5 |
| Usage | Frequently used | Rarely used |
**[⬆ Back to Top](#table-of-contents)**
177. ### Give an example where do you really need semicolon
It is recommended to use semicolons after every statement in JavaScript. For example, in the below case it throws an error ".. is not a function" at runtime due to missing semicolon.
```javascript
// define a function
var fn = (function () {
//...
})(
// semicolon missing at this line
// then execute some code inside a closure
function () {
//...
}
)();
```
and it will be interpreted as
```javascript
var fn = (function () {
//...
})(function () {
//...
})();
```
In this case, we are passing the second function as an argument to the first function and then trying to call the result of the first function call as a function. Hence, the second function will fail with a "... is not a function" error at runtime.
**[⬆ Back to Top](#table-of-contents)**
178. ### What is a freeze method
The **freeze()** method is used to freeze an object. Freezing an object does not allow adding new properties to an object,prevents from removing and prevents changing the enumerability, configurability, or writability of existing properties. i.e, It returns the passed object and does not create a frozen copy.
```javascript
const obj = {
prop: 100,
};
Object.freeze(obj);
obj.prop = 200; // Throws an error in strict mode
console.log(obj.prop); //100
```
Remember freezing is only applied to the top-level properties in objects but not for nested objects.
For example, let's try to freeze user object which has employment details as nested object and observe that details have been changed.
```javascript
const user = {
name: "John",
employment: {
department: "IT",
},
};
Object.freeze(user);
user.employment.department = "HR";
```
**Note:** It causes a TypeError if the argument passed is not an object.
**[⬆ Back to Top](#table-of-contents)**
179. ### What is the purpose of freeze method
Below are the main benefits of using freeze method,
1. It is used for freezing objects and arrays.
2. It is used to make an object immutable.
**[⬆ Back to Top](#table-of-contents)**
180. ### Why do I need to use freeze method
In the Object-oriented paradigm, an existing API contains certain elements that are not intended to be extended, modified, or re-used outside of their current context. Hence it works as the `final` keyword which is used in various languages.
**[⬆ Back to Top](#table-of-contents)**
181. ### How do you detect a browser language preference
You can use navigator object to detect a browser language preference as below,
```javascript
var language =
(navigator.languages && navigator.languages[0]) || // Chrome / Firefox
navigator.language || // All browsers
navigator.userLanguage; // IE <= 10
console.log(language);
```
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182. ### How to convert string to title case with javascript
Title case means that the first letter of each word is capitalized. You can convert a string to title case using the below function,
```javascript
function toTitleCase(str) {
return str.replace(/\w\S*/g, function (txt) {
return txt.charAt(0).toUpperCase() + txt.substring(1).toLowerCase();
});
}
toTitleCase("good morning john"); // Good Morning John
```
**[⬆ Back to Top](#table-of-contents)**
183. ### How do you detect javascript disabled in the page
You can use the `<noscript>` tag to detect javascript disabled or not. The code block inside `<noscript>` gets executed when JavaScript is disabled, and is typically used to display alternative content when the page generated in JavaScript.
```javascript
<script type="javascript">
// JS related code goes here
</script>
<noscript>
<a href="next_page.html?noJS=true">JavaScript is disabled in the page. Please click Next Page</a>
</noscript>
```
**[⬆ Back to Top](#table-of-contents)**
184. ### What are various operators supported by javascript
An operator is capable of manipulating(mathematical and logical computations) a certain value or operand. There are various operators supported by JavaScript as below,
1. **Arithmetic Operators:** Includes + (Addition),– (Subtraction), \* (Multiplication), / (Division), % (Modulus), + + (Increment) and – – (Decrement)
2. **Comparison Operators:** Includes = =(Equal),!= (Not Equal), ===(Equal with type), > (Greater than),> = (Greater than or Equal to),< (Less than),<= (Less than or Equal to)
3. **Logical Operators:** Includes &&(Logical AND),||(Logical OR),!(Logical NOT)
4. **Assignment Operators:** Includes = (Assignment Operator), += (Add and Assignment Operator), – = (Subtract and Assignment Operator), \*= (Multiply and Assignment), /= (Divide and Assignment), %= (Modules and Assignment)
5. **Ternary Operators:** It includes conditional(: ?) Operator
6. **typeof Operator:** It uses to find type of variable. The syntax looks like `typeof variable`
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185. ### What is a rest parameter
Rest parameter is an improved way to handle function parameters which allows us to represent an indefinite number of arguments as an array. The syntax would be as below,
```javascript
function f(a, b, ...theArgs) {
// ...
}
```
For example, let's take a sum example to calculate on dynamic number of parameters,
```javascript
function sum(...args) {
let total = 0;
for (const i of args) {
total += i;
}
return total;
}
console.log(sum(1, 2)); //3
console.log(sum(1, 2, 3)); //6
console.log(sum(1, 2, 3, 4)); //13
console.log(sum(1, 2, 3, 4, 5)); //15
```
**Note:** Rest parameter is added in ES2015 or ES6
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186. ### What happens if you do not use rest parameter as a last argument
The rest parameter should be the last argument, as its job is to collect all the remaining arguments into an array. For example, if you define a function like below it doesn’t make any sense and will throw an error.
```javascript
function someFunc(a,…b,c){
//You code goes here
return;
}
```
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187. ### What are the bitwise operators available in javascript
Below are the list of bitwise logical operators used in JavaScript
1. Bitwise AND ( & )
2. Bitwise OR ( | )
3. Bitwise XOR ( ^ )
4. Bitwise NOT ( ~ )
5. Left Shift ( << )
6. Sign Propagating Right Shift ( >> )
7. Zero fill Right Shift ( >>> )
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188. ### What is a spread operator
Spread operator allows iterables( arrays / objects / strings ) to be expanded into single arguments/elements. Let's take an example to see this behavior,
```javascript
function calculateSum(x, y, z) {
return x + y + z;
}
const numbers = [1, 2, 3];
console.log(calculateSum(...numbers)); // 6
```
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189. ### How do you determine whether object is frozen or not
Object.isFrozen() method is used to determine if an object is frozen or not.An object is frozen if all of the below conditions hold true,
1. If it is not extensible.
2. If all of its properties are non-configurable.
3. If all its data properties are non-writable.
The usage is going to be as follows,
```javascript
const object = {
property: "Welcome JS world",
};
Object.freeze(object);
console.log(Object.isFrozen(object));
```
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190. ### How do you determine two values same or not using object
The Object.is() method determines whether two values are the same value. For example, the usage with different types of values would be,
```javascript
Object.is("hello", "hello"); // true
Object.is(window, window); // true
Object.is([], []); // false
```
Two values are the same if one of the following holds:
1. both undefined
2. both null
3. both true or both false
4. both strings of the same length with the same characters in the same order
5. both the same object (means both object have same reference)
6. both numbers and
both +0
both -0
both NaN
both non-zero and both not NaN and both have the same value.
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191. ### What is the purpose of using object is method
Some of the applications of Object's `is` method are follows,
1. It is used for comparison of two strings.
2. It is used for comparison of two numbers.
3. It is used for comparing the polarity of two numbers.
4. It is used for comparison of two objects.
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192. ### How do you copy properties from one object to other
You can use the Object.assign() method which is used to copy the values and properties from one or more source objects to a target object. It returns the target object which has properties and values copied from the source objects. The syntax would be as below,
```javascript
Object.assign(target, ...sources);
```
Let's take example with one source and one target object,
```javascript
const target = { a: 1, b: 2 };
const source = { b: 3, c: 4 };
const returnedTarget = Object.assign(target, source);
console.log(target); // { a: 1, b: 3, c: 4 }
console.log(returnedTarget); // { a: 1, b: 3, c: 4 }
```
As observed in the above code, there is a common property(`b`) from source to target so it's value has been overwritten.
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193. ### What are the applications of assign method
Below are the some of main applications of Object.assign() method,
1. It is used for cloning an object.
2. It is used to merge objects with the same properties.
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194. ### What is a proxy object
The Proxy object is used to define custom behavior for fundamental operations such as property lookup, assignment, enumeration, function invocation, etc. The syntax would be as follows,
```javascript
var p = new Proxy(target, handler);
```
Let's take an example of proxy object,
```javascript
var handler = {
get: function (obj, prop) {
return prop in obj ? obj[prop] : 100;
},
};
var p = new Proxy({}, handler);
p.a = 10;
p.b = null;
console.log(p.a, p.b); // 10, null
console.log("c" in p, p.c); // false, 100
```
In the above code, it uses `get` handler which define the behavior of the proxy when an operation is performed on it
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195. ### What is the purpose of seal method
The **Object.seal()** method is used to seal an object, by preventing new properties from being added to it and marking all existing properties as non-configurable. But values of present properties can still be changed as long as they are writable. Let's see the below example to understand more about seal() method
```javascript
const object = {
property: "Welcome JS world",
};
Object.seal(object);
object.property = "Welcome to object world";
console.log(Object.isSealed(object)); // true
delete object.property; // You cannot delete when sealed
console.log(object.property); //Welcome to object world
```
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196. ### What are the applications of seal method
Below are the main applications of Object.seal() method,
1. It is used for sealing objects and arrays.
2. It is used to make an object immutable.
**[⬆ Back to Top](#table-of-contents)**
197. ### What are the differences between freeze and seal methods
If an object is frozen using the Object.freeze() method then its properties become immutable and no changes can be made in them whereas if an object is sealed using the Object.seal() method then the changes can be made in the existing properties of the object.
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198. ### How do you determine if an object is sealed or not
The Object.isSealed() method is used to determine if an object is sealed or not. An object is sealed if all of the below conditions hold true
1. If it is not extensible.
2. If all of its properties are non-configurable.
3. If it is not removable (but not necessarily non-writable).
Let's see it in the action
```javascript
const object = {
property: "Hello, Good morning",
};
Object.seal(object); // Using seal() method to seal the object
console.log(Object.isSealed(object)); // checking whether the object is sealed or not
```
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199. ### How do you get enumerable key and value pairs
The Object.entries() method is used to return an array of a given object's own enumerable string-keyed property [key, value] pairs, in the same order as that provided by a for...in loop. Let's see the functionality of object.entries() method in an example,
```javascript
const object = {
a: "Good morning",
b: 100,
};
for (let [key, value] of Object.entries(object)) {
console.log(`${key}: ${value}`); // a: 'Good morning'
// b: 100
}
```
**Note:** The order is not guaranteed as object defined.
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200. ### What is the main difference between Object.values and Object.entries method
The Object.values() method's behavior is similar to Object.entries() method but it returns an array of values instead [key,value] pairs.
```javascript
const object = {
a: "Good morning",
b: 100,
};
for (let value of Object.values(object)) {
console.log(`${value}`); // 'Good morning'
100;
}
```
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201. ### How can you get the list of keys of any object
You can use the `Object.keys()` method which is used to return an array of a given object's own property names, in the same order as we get with a normal loop. For example, you can get the keys of a user object,
```javascript
const user = {
name: "John",
gender: "male",
age: 40,
};
console.log(Object.keys(user)); //['name', 'gender', 'age']
```
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202. ### How do you create an object with prototype
The Object.create() method is used to create a new object with the specified prototype object and properties. i.e, It uses an existing object as the prototype of the newly created object. It returns a new object with the specified prototype object and properties.
```javascript
const user = {
name: "John",
printInfo: function () {
console.log(`My name is ${this.name}.`);
},
};
const admin = Object.create(user);
admin.name = "Nick"; // Remember that "name" is a property set on "admin" but not on "user" object
admin.printInfo(); // My name is Nick
```
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203. ### What is a WeakSet
WeakSet is used to store a collection of weakly(weak references) held objects. The syntax would be as follows,
```javascript
new WeakSet([iterable]);
```
Let's see the below example to explain it's behavior,
```javascript
var ws = new WeakSet();
var user = {};
ws.add(user);
ws.has(user); // true
ws.delete(user); // removes user from the set
ws.has(user); // false, user has been removed
```
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204. ### What are the differences between WeakSet and Set
The main difference is that references to objects in Set are strong while references to objects in WeakSet are weak. i.e, An object in WeakSet can be garbage collected if there is no other reference to it.
Other differences are,
1. Sets can store any value Whereas WeakSets can store only collections of objects
2. WeakSet does not have size property unlike Set
3. WeakSet does not have methods such as clear, keys, values, entries, forEach.
4. WeakSet is not iterable.
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205. ### List down the collection of methods available on WeakSet
Below are the list of methods available on WeakSet,
1. add(value): A new object is appended with the given value to the weakset
2. delete(value): Deletes the value from the WeakSet collection.
3. has(value): It returns true if the value is present in the WeakSet Collection, otherwise it returns false.
Let's see the functionality of all the above methods in an example,
```javascript
var weakSetObject = new WeakSet();
var firstObject = {};
var secondObject = {};
// add(value)
weakSetObject.add(firstObject);
weakSetObject.add(secondObject);
console.log(weakSetObject.has(firstObject)); //true
weakSetObject.delete(secondObject);
```
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206. ### What is a WeakMap
The WeakMap object is a collection of key/value pairs in which the keys are weakly referenced. In this case, keys must be objects and the values can be arbitrary values. The syntax is looking like as below,
```javascript
new WeakMap([iterable]);
```
Let's see the below example to explain it's behavior,
```javascript
var ws = new WeakMap();
var user = {};
ws.set(user);
ws.has(user); // true
ws.delete(user); // removes user from the map
ws.has(user); // false, user has been removed
```
**[⬆ Back to Top](#table-of-contents)**
207. ### What are the differences between WeakMap and Map
The main difference is that references to key objects in Map are strong while references to key objects in WeakMap are weak. i.e, A key object in WeakMap can be garbage collected if there is no other reference to it.
Other differences are,
1. Maps can store any key type Whereas WeakMaps can store only collections of key objects
2. WeakMap does not have size property unlike Map
3. WeakMap does not have methods such as clear, keys, values, entries, forEach.
4. WeakMap is not iterable.
**[⬆ Back to Top](#table-of-contents)**
208. ### List down the collection of methods available on WeakMap
Below are the list of methods available on WeakMap,
1. set(key, value): Sets the value for the key in the WeakMap object. Returns the WeakMap object.
2. delete(key): Removes any value associated to the key.
3. has(key): Returns a Boolean asserting whether a value has been associated to the key in the WeakMap object or not.
4. get(key): Returns the value associated to the key, or undefined if there is none.
Let's see the functionality of all the above methods in an example,
```javascript
var weakMapObject = new WeakMap();
var firstObject = {};
var secondObject = {};
// set(key, value)
weakMapObject.set(firstObject, "John");
weakMapObject.set(secondObject, 100);
console.log(weakMapObject.has(firstObject)); //true
console.log(weakMapObject.get(firstObject)); // John
weakMapObject.delete(secondObject);
```
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209. ### What is the purpose of uneval
The uneval() is an inbuilt function which is used to create a string representation of the source code of an Object. It is a top-level function and is not associated with any object. Let's see the below example to know more about it's functionality,
```javascript
var a = 1;
uneval(a); // returns a String containing 1
uneval(function user() {}); // returns "(function user(){})"
```
The `uneval()` function has been deprecated. It is recommended to use `toString()` for functions and `JSON.toStringify()` for other cases.
```javascript
function user() {}
console.log(user.toString()); // returns "(function user(){})"
```
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210. ### How do you encode an URL
The encodeURI() function is used to encode complete URI which has special characters except (, / ? : @ & = + $ #) characters.
```javascript
var uri = "https://mozilla.org/?x=шеллы";
var encoded = encodeURI(uri);
console.log(encoded); // https://mozilla.org/?x=%D1%88%D0%B5%D0%BB%D0%BB%D1%8B
```
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211. ### How do you decode an URL
The decodeURI() function is used to decode a Uniform Resource Identifier (URI) previously created by encodeURI().
```javascript
var uri = "https://mozilla.org/?x=шеллы";
var encoded = encodeURI(uri);
console.log(encoded); // https://mozilla.org/?x=%D1%88%D0%B5%D0%BB%D0%BB%D1%8B
try {
console.log(decodeURI(encoded)); // "https://mozilla.org/?x=шеллы"
} catch (e) {
// catches a malformed URI
console.error(e);
}
```
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212. ### How do you print the contents of web page
The window object provided a print() method which is used to print the contents of the current window. It opens a Print dialog box which lets you choose between various printing options. Let's see the usage of print method in an example,
```html
<input type="button" value="Print" onclick="window.print()" />
```
**Note:** In most browsers, it will block while the print dialog is open.
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213. ### What is the difference between uneval and eval
The `uneval` function returns the source of a given object; whereas the `eval` function does the opposite, by evaluating that source code in a different memory area. Let's see an example to clarify the difference,
```javascript
var msg = uneval(function greeting() {
return "Hello, Good morning";
});
var greeting = eval(msg);
greeting(); // returns "Hello, Good morning"
```
**[⬆ Back to Top](#table-of-contents)**
214. ### What is an anonymous function
An anonymous function is a function without a name! Anonymous functions are commonly assigned to a variable name or used as a callback function. The syntax would be as below,
```javascript
function (optionalParameters) {
//do something
}
const myFunction = function(){ //Anonymous function assigned to a variable
//do something
};
[1, 2, 3].map(function(element){ //Anonymous function used as a callback function
//do something
});
```
Let's see the above anonymous function in an example,
```javascript
var x = function (a, b) {
return a * b;
};
var z = x(5, 10);
console.log(z); // 50
```
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215. ### What is the precedence order between local and global variables
A local variable takes precedence over a global variable with the same name. Let's see this behavior in an example.
```javascript
var msg = "Good morning";
function greeting() {
msg = "Good Evening";
console.log(msg); // Good Evening
}
greeting();
```
**[⬆ Back to Top](#table-of-contents)**
216. ### What are javascript accessors
ECMAScript 5 introduced javascript object accessors or computed properties through getters and setters. Getters uses the `get` keyword whereas Setters uses the `set` keyword.
```javascript
var user = {
firstName: "John",
lastName: "Abraham",
language: "en",
get lang() {
return this.language;
},
set lang(lang) {
this.language = lang;
},
};
console.log(user.lang); // getter access lang as en
user.lang = "fr";
console.log(user.lang); // setter used to set lang as fr
```
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217. ### How do you define property on Object constructor
The Object.defineProperty() static method is used to define a new property directly on an object, or modify an existing property on an object, and returns the object. Let's see an example to know how to define property,
```javascript
const newObject = {};
Object.defineProperty(newObject, "newProperty", {
value: 100,
writable: false,
});
console.log(newObject.newProperty); // 100
newObject.newProperty = 200; // It throws an error in strict mode due to writable setting
```
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218. ### What is the difference between get and defineProperty
Both have similar results until unless you use classes. If you use `get` the property will be defined on the prototype of the object whereas using `Object.defineProperty()` the property will be defined on the instance it is applied to.
**[⬆ Back to Top](#table-of-contents)**
219. ### What are the advantages of Getters and Setters
Below are the list of benefits of Getters and Setters,
1. They provide simpler syntax
2. They are used for defining computed properties, or accessors in JS.
3. Useful to provide equivalence relation between properties and methods
4. They can provide better data quality
5. Useful for doing things behind the scenes with the encapsulated logic.
**[⬆ Back to Top](#table-of-contents)**
220. ### Can I add getters and setters using defineProperty method
Yes, You can use the `Object.defineProperty()` method to add Getters and Setters. For example, the below counter object uses increment, decrement, add and subtract properties,
```javascript
var obj = { counter: 0 };
// Define getters
Object.defineProperty(obj, "increment", {
get: function () {
this.counter++;
},
});
Object.defineProperty(obj, "decrement", {
get: function () {
this.counter--;
},
});
// Define setters
Object.defineProperty(obj, "add", {
set: function (value) {
this.counter += value;
},
});
Object.defineProperty(obj, "subtract", {
set: function (value) {
this.counter -= value;
},
});
obj.add = 10;
obj.subtract = 5;
console.log(obj.increment); //6
console.log(obj.decrement); //5
```
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221. ### What is the purpose of switch-case
The switch case statement in JavaScript is used for decision making purposes. In a few cases, using the switch case statement is going to be more convenient than if-else statements. The syntax would be as below,
```javascript
switch (expression)
{
case value1:
statement1;
break;
case value2:
statement2;
break;
.
.
case valueN:
statementN;
break;
default:
statementDefault;
}
```
The above multi-way branch statement provides an easy way to dispatch execution to different parts of code based on the value of the expression.
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222. ### What are the conventions to be followed for the usage of switch case
Below are the list of conventions should be taken care,
1. The expression can be of type either number or string.
2. Duplicate values are not allowed for the expression.
3. The default statement is optional. If the expression passed to switch does not match with any case value then the statement within default case will be executed.
4. The break statement is used inside the switch to terminate a statement sequence.
5. The break statement is optional. But if it is omitted, the execution will continue on into the next case.
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223. ### What are primitive data types
A primitive data type is data that has a primitive value (which has no properties or methods). There are 7 types of primitive data types.
1. string
2. number
3. boolean
4. null
5. undefined
6. bigint
7. symbol
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224. ### What are the different ways to access object properties
There are 3 possible ways for accessing the property of an object.
1. **Dot notation:** It uses dot for accessing the properties
```javascript
objectName.property;
```
1. **Square brackets notation:** It uses square brackets for property access
```javascript
objectName["property"];
```
1. **Expression notation:** It uses expression in the square brackets
```javascript
objectName[expression];
```
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225. ### What are the function parameter rules
JavaScript functions follow below rules for parameters,
1. The function definitions do not specify data types for parameters.
2. Do not perform type checking on the passed arguments.
3. Do not check the number of arguments received.
i.e, The below function follows the above rules,
```javascript
function functionName(parameter1, parameter2, parameter3) {
console.log(parameter1); // 1
}
functionName(1);
```
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226. ### What is an error object
An error object is a built in error object that provides error information when an error occurs. It has two properties: name and message. For example, the below function logs error details,
```javascript
try {
greeting("Welcome");
} catch (err) {
console.log(err.name + "<br>" + err.message);
}
```
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227. ### When you get a syntax error
A SyntaxError is thrown if you try to evaluate code with a syntax error. For example, the below missing quote for the function parameter throws a syntax error
```javascript
try {
eval("greeting('welcome)"); // Missing ' will produce an error
} catch (err) {
console.log(err.name);
}
```
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228. ### What are the different error names from error object
There are 6 different types of error names returned from error object,
| Error Name | Description |
|---- | ---------
| EvalError | An error has occurred in the eval() function |
| RangeError | An error has occurred with a number "out of range" |
| ReferenceError | An error due to an illegal reference|
| SyntaxError | An error due to a syntax error|
| TypeError | An error due to a type error |
| URIError | An error due to encodeURI() |
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229. ### What are the various statements in error handling
Below are the list of statements used in an error handling,
1. **try:** This statement is used to test a block of code for errors
2. **catch:** This statement is used to handle the error
3. **throw:** This statement is used to create custom errors.
4. **finally:** This statement is used to execute code after try and catch regardless of the result.
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230. ### What are the two types of loops in javascript
1. **Entry Controlled loops:** In this kind of loop type, the test condition is tested before entering the loop body. For example, For Loop and While Loop comes under this category.
2. **Exit Controlled Loops:** In this kind of loop type, the test condition is tested or evaluated at the end of the loop body. i.e, the loop body will execute at least once irrespective of test condition true or false. For example, do-while loop comes under this category.
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231. ### What is nodejs
Node.js is a server-side platform built on Chrome's JavaScript runtime for easily building fast and scalable network applications. It is an event-based, non-blocking, asynchronous I/O runtime that uses Google's V8 JavaScript engine and libuv library.
**[⬆ Back to Top](#table-of-contents)**
232. ### What is an Intl object
The Intl object is the namespace for the ECMAScript Internationalization API, which provides language sensitive string comparison, number formatting, and date and time formatting. It provides access to several constructors and language sensitive functions.
**[⬆ Back to Top](#table-of-contents)**
233. ### How do you perform language specific date and time formatting
You can use the `Intl.DateTimeFormat` object which is a constructor for objects that enable language-sensitive date and time formatting. Let's see this behavior with an example,
```javascript
var date = new Date(Date.UTC(2019, 07, 07, 3, 0, 0));
console.log(new Intl.DateTimeFormat("en-GB").format(date)); // 07/08/2019
console.log(new Intl.DateTimeFormat("en-AU").format(date)); // 07/08/2019
```
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234. ### What is an Iterator
An iterator is an object which defines a sequence and a return value upon its termination. It implements the Iterator protocol with a `next()` method which returns an object with two properties: `value` (the next value in the sequence) and `done` (which is true if the last value in the sequence has been consumed).
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235. ### How does synchronous iteration works
Synchronous iteration was introduced in ES6 and it works with below set of components,
**Iterable:** It is an object which can be iterated over via a method whose key is Symbol.iterator.
**Iterator:** It is an object returned by invoking `[Symbol.iterator]()` on an iterable. This iterator object wraps each iterated element in an object and returns it via `next()` method one by one.
**IteratorResult:** It is an object returned by `next()` method. The object contains two properties; the `value` property contains an iterated element and the `done` property determines whether the element is the last element or not.
Let's demonstrate synchronous iteration with an array as below,
```javascript
const iterable = ["one", "two", "three"];
const iterator = iterable[Symbol.iterator]();
console.log(iterator.next()); // { value: 'one', done: false }
console.log(iterator.next()); // { value: 'two', done: false }
console.log(iterator.next()); // { value: 'three', done: false }
console.log(iterator.next()); // { value: 'undefined, done: true }
```
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236. ### What is an event loop
The event loop is a process that continuously monitors both the call stack and the event queue and checks whether or not the call stack is empty. If the call stack is empty and there are pending events in the event queue, the event loop dequeues the event from the event queue and pushes it to the call stack. The call stack executes the event, and any additional events generated during the execution are added to the end of the event queue.
**Note:** The event loop allows Node.js to perform non-blocking I/O operations, even though JavaScript is single-threaded, by offloading operations to the system kernel whenever possible. Since most modern kernels are multi-threaded, they can handle multiple operations executing in the background.
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237. ### What is call stack
Call Stack is a data structure for javascript interpreters to keep track of function calls(creates execution context) in the program. It has two major actions,
1. Whenever you call a function for its execution, you are pushing it to the stack.
2. Whenever the execution is completed, the function is popped out of the stack.
Let's take an example and it's state representation in a diagram format
```javascript
function hungry() {
eatFruits();
}
function eatFruits() {
return "I'm eating fruits";
}
// Invoke the `hungry` function
hungry();
```
The above code processed in a call stack as below,
1. Add the `hungry()` function to the call stack list and execute the code.
2. Add the `eatFruits()` function to the call stack list and execute the code.
3. Delete the `eatFruits()` function from our call stack list.
4. Delete the `hungry()` function from the call stack list since there are no items anymore.
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238. ### What is an event queue
The event queue follows the queue data structure. It stores async callbacks to be added to the call stack. It is also known as the Callback Queue or Macrotask Queue.
Whenever the call stack receives an async function, it is moved into the Web API. Based on the function, Web API executes it and awaits the result. Once it is finished, it moves the callback into the event queue (the callback of the promise is moved into the microtask queue).
The event loop constantly checks whether or not the call stack is empty. Once the call stack is empty and there is a callback in the event queue, the event loop moves the callback into the call stack. But if there is a callback in the microtask queue as well, it is moved first. The microtask queue has a higher priority than the event queue.
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239. ### What is a decorator
A decorator is an expression that evaluates to a function and that takes the target, name, and decorator descriptor as arguments. Also, it optionally returns a decorator descriptor to install on the target object. Let's define admin decorator for user class at design time,
```javascript
function admin(isAdmin) {
return function(target) {
target.isAdmin = isAdmin;
}
}
@admin(true)
class User() {
}
console.log(User.isAdmin); //true
@admin(false)
class User() {
}
console.log(User.isAdmin); //false
```
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240. ### What are the properties of Intl object
Below are the list of properties available on Intl object,
1. **Collator:** These are the objects that enable language-sensitive string comparison.
2. **DateTimeFormat:** These are the objects that enable language-sensitive date and time formatting.
3. **ListFormat:** These are the objects that enable language-sensitive list formatting.
4. **NumberFormat:** Objects that enable language-sensitive number formatting.
5. **PluralRules:** Objects that enable plural-sensitive formatting and language-specific rules for plurals.
6. **RelativeTimeFormat:** Objects that enable language-sensitive relative time formatting.
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241. ### What is an Unary operator
The unary(+) operator is used to convert a variable to a number.If the variable cannot be converted, it will still become a number but with the value NaN. Let's see this behavior in an action.
```javascript
var x = "100";
var y = +x;
console.log(typeof x, typeof y); // string, number
var a = "Hello";
var b = +a;
console.log(typeof a, typeof b, b); // string, number, NaN
```
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242. ### How do you sort elements in an array
The sort() method is used to sort the elements of an array in place and returns the sorted array. The example usage would be as below,
```javascript
var months = ["Aug", "Sep", "Jan", "June"];
months.sort();
console.log(months); // ["Aug", "Jan", "June", "Sep"]
```
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243. ### What is the purpose of compareFunction while sorting arrays
The compareFunction is used to define the sort order. If omitted, the array elements are converted to strings, then sorted according to each character's Unicode code point value. Let's take an example to see the usage of compareFunction,
```javascript
let numbers = [1, 2, 5, 3, 4];
numbers.sort((a, b) => b - a);
console.log(numbers); // [5, 4, 3, 2, 1]
```
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244. ### How do you reversing an array
You can use the reverse() method to reverse the elements in an array. This method is useful to sort an array in descending order. Let's see the usage of reverse() method in an example,
```javascript
let numbers = [1, 2, 5, 3, 4];
numbers.sort((a, b) => b - a);
numbers.reverse();
console.log(numbers); // [1, 2, 3, 4 ,5]
```
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245. ### How do you find min and max value in an array
You can use `Math.min` and `Math.max` methods on array variables to find the minimum and maximum elements within an array. Let's create two functions to find the min and max value with in an array,
```javascript
var marks = [50, 20, 70, 60, 45, 30];
function findMin(arr) {
return Math.min.apply(null, arr);
}
function findMax(arr) {
return Math.max.apply(null, arr);
}
console.log(findMin(marks));
console.log(findMax(marks));
```
**[⬆ Back to Top](#table-of-contents)**
246. ### How do you find min and max values without Math functions
You can write functions which loop through an array comparing each value with the lowest value or highest value to find the min and max values. Let's create those functions to find min and max values,
```javascript
var marks = [50, 20, 70, 60, 45, 30];
function findMin(arr) {
var length = arr.length;
var min = Infinity;
while (length--) {
if (arr[length] < min) {
min = arr[length];
}
}
return min;
}
function findMax(arr) {
var length = arr.length;
var max = -Infinity;
while (length--) {
if (arr[length] > max) {
max = arr[length];
}
}
return max;
}
console.log(findMin(marks));
console.log(findMax(marks));
```
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247. ### What is an empty statement and purpose of it
The empty statement is a semicolon (;) indicating that no statement will be executed, even if JavaScript syntax requires one. Since there is no action with an empty statement you might think that it's usage is quite less, but the empty statement is occasionally useful when you want to create a loop that has an empty body. For example, you can initialize an array with zero values as below,
```javascript
// Initialize an array a
for (let i = 0; i < a.length; a[i++] = 0);
```
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248. ### How do you get metadata of a module
You can use the `import.meta` object which is a meta-property exposing context-specific meta data to a JavaScript module. It contains information about the current module, such as the module's URL. In browsers, you might get different meta data than NodeJS.
```javascript
<script type="module" src="welcome-module.js"></script>;
console.log(import.meta); // { url: "file:///home/user/welcome-module.js" }
```
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249. ### What is a comma operator
The comma operator is used to evaluate each of its operands from left to right and returns the value of the last operand. This is totally different from comma usage within arrays, objects, and function arguments and parameters. For example, the usage for numeric expressions would be as below,
```javascript
var x = 1;
x = (x++, x);
console.log(x); // 2
```
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250. ### What is the advantage of a comma operator
It is normally used to include multiple expressions in a location that requires a single expression. One of the common usages of this comma operator is to supply multiple parameters in a `for` loop. For example, the below for loop uses multiple expressions in a single location using comma operator,
```javascript
for (var a = 0, b =10; a <= 10; a++, b--)
```
You can also use the comma operator in a return statement where it processes before returning.
```javascript
function myFunction() {
var a = 1;
return (a += 10), a; // 11
}
```
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251. ### What is typescript
TypeScript is a typed superset of JavaScript created by Microsoft that adds optional types, classes, async/await, and many other features, and compiles to plain JavaScript. Angular built entirely in TypeScript and used as a primary language. You can install it globally as
```bash
npm install -g typescript
```
Let's see a simple example of TypeScript usage,
```typescript
function greeting(name: string): string {
return "Hello, " + name;
}
let user = "Sudheer";
console.log(greeting(user));
```
The greeting method allows only string type as argument.
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252. ### What are the differences between javascript and typescript
Below are the list of differences between javascript and typescript,
| feature | typescript | javascript |
| ------------------- | ------------------------------------- | ----------------------------------------------- |
| Language paradigm | Object oriented programming language | Scripting language |
| Typing support | Supports static typing | It has dynamic typing |
| Modules | Supported | Not supported |
| Interface | It has interfaces concept | Doesn't support interfaces |
| Optional parameters | Functions support optional parameters | No support of optional parameters for functions |
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253. ### What are the advantages of typescript over javascript
Below are some of the advantages of typescript over javascript,
1. TypeScript is able to find compile time errors at the development time only and it makes sures less runtime errors. Whereas javascript is an interpreted language.
2. TypeScript is strongly-typed or supports static typing which allows for checking type correctness at compile time. This is not available in javascript.
3. TypeScript compiler can compile the .ts files into ES3,ES4 and ES5 unlike ES6 features of javascript which may not be supported in some browsers.
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254. ### What is an object initializer
An object initializer is an expression that describes the initialization of an Object. The syntax for this expression is represented as a comma-delimited list of zero or more pairs of property names and associated values of an object, enclosed in curly braces ({}). This is also known as literal notation. It is one of the ways to create an object.
```javascript
var initObject = { a: "John", b: 50, c: {} };
console.log(initObject.a); // John
```
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255. ### What is a constructor method
The constructor method is a special method for creating and initializing an object created within a class. If you do not specify a constructor method, a default constructor is used. The example usage of constructor would be as below,
```javascript
class Employee {
constructor() {
this.name = "John";
}
}
var employeeObject = new Employee();
console.log(employeeObject.name); // John
```
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256. ### What happens if you write constructor more than once in a class
The "constructor" in a class is a special method and it should be defined only once in a class. i.e, If you write a constructor method more than once in a class it will throw a `SyntaxError` error.
```javascript
class Employee {
constructor() {
this.name = "John";
}
constructor() { // Uncaught SyntaxError: A class may only have one constructor
this.age = 30;
}
}
var employeeObject = new Employee();
console.log(employeeObject.name);
```
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257. ### How do you call the constructor of a parent class
You can use the `super` keyword to call the constructor of a parent class. Remember that `super()` must be called before using 'this' reference. Otherwise it will cause a reference error. Let's the usage of it,
```javascript
class Square extends Rectangle {
constructor(length) {
super(length, length);
this.name = "Square";
}
get area() {
return this.width * this.height;
}
set area(value) {
this.area = value;
}
}
```
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258. ### How do you get the prototype of an object
You can use the `Object.getPrototypeOf(obj)` method to return the prototype of the specified object. i.e. The value of the internal `prototype` property. If there are no inherited properties then `null` value is returned.
```javascript
const newPrototype = {};
const newObject = Object.create(newPrototype);
console.log(Object.getPrototypeOf(newObject) === newPrototype); // true
```
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259. ### What happens If I pass string type for getPrototype method
In ES5, it will throw a TypeError exception if the obj parameter isn't an object. Whereas in ES2015, the parameter will be coerced to an `Object`.
```javascript
// ES5
Object.getPrototypeOf("James"); // TypeError: "James" is not an object
// ES2015
Object.getPrototypeOf("James"); // String.prototype
```
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260. ### How do you set prototype of one object to another
You can use the `Object.setPrototypeOf()` method that sets the prototype (i.e., the internal `Prototype` property) of a specified object to another object or null. For example, if you want to set prototype of a square object to rectangle object would be as follows,
```javascript
Object.setPrototypeOf(Square.prototype, Rectangle.prototype);
Object.setPrototypeOf({}, null);
```
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261. ### How do you check whether an object can be extendable or not
The `Object.isExtensible()` method is used to determine if an object is extendable or not. i.e, Whether it can have new properties added to it or not.
```javascript
const newObject = {};
console.log(Object.isExtensible(newObject)); //true
```
**Note:** By default, all the objects are extendable. i.e, The new properties can be added or modified.
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262. ### How do you prevent an object to extend
The `Object.preventExtensions()` method is used to prevent new properties from ever being added to an object. In other words, it prevents future extensions to the object. Let's see the usage of this property,
```javascript
const newObject = {};
Object.preventExtensions(newObject); // NOT extendable
try {
Object.defineProperty(newObject, "newProperty", {
// Adding new property
value: 100,
});
} catch (e) {
console.log(e); // TypeError: Cannot define property newProperty, object is not extensible
}
```
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263. ### What are the different ways to make an object non-extensible
You can mark an object non-extensible in 3 ways,
1. Object.preventExtensions
2. Object.seal
3. Object.freeze
```javascript
var newObject = {};
Object.preventExtensions(newObject); // Prevent objects are non-extensible
Object.isExtensible(newObject); // false
var sealedObject = Object.seal({}); // Sealed objects are non-extensible
Object.isExtensible(sealedObject); // false
var frozenObject = Object.freeze({}); // Frozen objects are non-extensible
Object.isExtensible(frozenObject); // false
```
**[⬆ Back to Top](#table-of-contents)**
264. ### How do you define multiple properties on an object
The `Object.defineProperties()` method is used to define new or modify existing properties directly on an object and returning the object. Let's define multiple properties on an empty object,
```javascript
const newObject = {};
Object.defineProperties(newObject, {
newProperty1: {
value: "John",
writable: true,
},
newProperty2: {},
});
```
**[⬆ Back to Top](#table-of-contents)**
265. ### What is MEAN in javascript
The MEAN (MongoDB, Express, AngularJS, and Node.js) stack is the most popular open-source JavaScript software tech stack available for building dynamic web apps where you can write both the server-side and client-side halves of the web project entirely in JavaScript.
**[⬆ Back to Top](#table-of-contents)**
266. ### What Is Obfuscation in javascript
Obfuscation is the deliberate act of creating obfuscated javascript code(i.e, source or machine code) that is difficult for humans to understand. It is something similar to encryption, but a machine can understand the code and execute it.
Let's see the below function before Obfuscation,
```javascript
function greeting() {
console.log("Hello, welcome to JS world");
}
```
And after the code Obfuscation, it would be appeared as below,
```javascript
eval(
(function (p, a, c, k, e, d) {
e = function (c) {
return c;
};
if (!"".replace(/^/, String)) {
while (c--) {
d[c] = k[c] || c;
}
k = [
function (e) {
return d[e];
},
];
e = function () {
return "\\w+";
};
c = 1;
}
while (c--) {
if (k[c]) {
p = p.replace(new RegExp("\\b" + e(c) + "\\b", "g"), k[c]);
}
}
return p;
})(
"2 1(){0.3('4, 7 6 5 8')}",
9,
9,
"console|greeting|function|log|Hello|JS|to|welcome|world".split("|"),
0,
{}
)
);
```
**[⬆ Back to Top](#table-of-contents)**
267. ### Why do you need Obfuscation
Below are the few reasons for Obfuscation,
1. The Code size will be reduced. So data transfers between server and client will be fast.
2. It hides the business logic from outside world and protects the code from others
3. Reverse engineering is highly difficult
4. The download time will be reduced
**[⬆ Back to Top](#table-of-contents)**
268. ### What is Minification
Minification is the process of removing all unnecessary characters(empty spaces are removed) and variables will be renamed without changing it's functionality. It is also a type of obfuscation .
**[⬆ Back to Top](#table-of-contents)**
269. ### What are the advantages of minification
Normally it is recommended to use minification for heavy traffic and intensive requirements of resources. It reduces file sizes with below benefits,
1. Decreases loading times of a web page
2. Saves bandwidth usages
**[⬆ Back to Top](#table-of-contents)**
270. ### What are the differences between Obfuscation and Encryption
Below are the main differences between Obfuscation and Encryption,
| Feature | Obfuscation | Encryption |
| ------------------ | ----------------------------------------------- | ----------------------------------------------------------------------- |
| Definition | Changing the form of any data in any other form | Changing the form of information to an unreadable format by using a key |
| A key to decode | It can be decoded without any key | It is required |
| Target data format | It will be converted to a complex form | Converted into an unreadable format |
**[⬆ Back to Top](#table-of-contents)**
271. ### What are the common tools used for minification
There are many online/offline tools to minify the javascript files,
1. Google's Closure Compiler
2. UglifyJS2
3. jsmin
4. javascript-minifier.com/
5. prettydiff.com
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272. ### How do you perform form validation using javascript
JavaScript can be used to perform HTML form validation. For example, if the form field is empty, the function needs to notify, and return false, to prevent the form being submitted.
Lets' perform user login in an html form,
```html
<form name="myForm" onsubmit="return validateForm()" method="post">
User name: <input type="text" name="uname" />
<input type="submit" value="Submit" />
</form>
```
And the validation on user login is below,
```javascript
function validateForm() {
var x = document.forms["myForm"]["uname"].value;
if (x == "") {
alert("The username shouldn't be empty");
return false;
}
}
```
**[⬆ Back to Top](#table-of-contents)**
273. ### How do you perform form validation without javascript
You can perform HTML form validation automatically without using javascript. The validation enabled by applying the `required` attribute to prevent form submission when the input is empty.
```html
<form method="post">
<input type="text" name="uname" required />
<input type="submit" value="Submit" />
</form>
```
**Note:** Automatic form validation does not work in Internet Explorer 9 or earlier.
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274. ### What are the DOM methods available for constraint validation
The below DOM methods are available for constraint validation on an invalid input,
1. checkValidity(): It returns true if an input element contains valid data.
2. setCustomValidity(): It is used to set the validationMessage property of an input element.
Let's take an user login form with DOM validations
```javascript
function myFunction() {
var userName = document.getElementById("uname");
if (!userName.checkValidity()) {
document.getElementById("message").innerHTML =
userName.validationMessage;
} else {
document.getElementById("message").innerHTML =
"Entered a valid username";
}
}
```
**[⬆ Back to Top](#table-of-contents)**
275. ### What are the available constraint validation DOM properties
Below are the list of some of the constraint validation DOM properties available,
1. validity: It provides a list of boolean properties related to the validity of an input element.
2. validationMessage: It displays the message when the validity is false.
3. willValidate: It indicates if an input element will be validated or not.
**[⬆ Back to Top](#table-of-contents)**
276. ### What are the list of validity properties
The validity property of an input element provides a set of properties related to the validity of data.
1. customError: It returns true, if a custom validity message is set.
2. patternMismatch: It returns true, if an element's value does not match its pattern attribute.
3. rangeOverflow: It returns true, if an element's value is greater than its max attribute.
4. rangeUnderflow: It returns true, if an element's value is less than its min attribute.
5. stepMismatch: It returns true, if an element's value is invalid according to step attribute.
6. tooLong: It returns true, if an element's value exceeds its maxLength attribute.
7. typeMismatch: It returns true, if an element's value is invalid according to type attribute.
8. valueMissing: It returns true, if an element with a required attribute has no value.
9. valid: It returns true, if an element's value is valid.
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277. ### Give an example usage of rangeOverflow property
If an element's value is greater than its max attribute then rangeOverflow property returns true. For example, the below form submission throws an error if the value is more than 100,
```html
<input id="age" type="number" max="100" />
<button onclick="myOverflowFunction()">OK</button>
```
```javascript
function myOverflowFunction() {
if (document.getElementById("age").validity.rangeOverflow) {
alert("The mentioned age is not allowed");
}
}
```
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278. ### Is enums feature available in javascript
No, javascript does not natively support enums. But there are different kinds of solutions to simulate them even though they may not provide exact equivalents. For example, you can use freeze or seal on object,
```javascript
var DaysEnum = Object.freeze({"monday":1, "tuesday":2, "wednesday":3, ...})
```
**[⬆ Back to Top](#table-of-contents)**
279. ### What is an enum
An enum is a type restricting variables to one value from a predefined set of constants. JavaScript has no enums but typescript provides built-in enum support.
```javascript
enum Color {
RED, GREEN, BLUE
}
```
**[⬆ Back to Top](#table-of-contents)**
280. ### How do you list all properties of an object
You can use the `Object.getOwnPropertyNames()` method which returns an array of all properties found directly in a given object. Let's the usage of it in an example,
```javascript
const newObject = {
a: 1,
b: 2,
c: 3,
};
console.log(Object.getOwnPropertyNames(newObject));
["a", "b", "c"];
```
**[⬆ Back to Top](#table-of-contents)**
281. ### How do you get property descriptors of an object
You can use the `Object.getOwnPropertyDescriptors()` method which returns all own property descriptors of a given object. The example usage of this method is below,
```javascript
const newObject = {
a: 1,
b: 2,
c: 3,
};
const descriptorsObject = Object.getOwnPropertyDescriptors(newObject);
console.log(descriptorsObject.a.writable); //true
console.log(descriptorsObject.a.configurable); //true
console.log(descriptorsObject.a.enumerable); //true
console.log(descriptorsObject.a.value); // 1
```
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282. ### What are the attributes provided by a property descriptor
A property descriptor is a record which has the following attributes
1. value: The value associated with the property
2. writable: Determines whether the value associated with the property can be changed or not
3. configurable: Returns true if the type of this property descriptor can be changed and if the property can be deleted from the corresponding object.
4. enumerable: Determines whether the property appears during enumeration of the properties on the corresponding object or not.
5. set: A function which serves as a setter for the property
6. get: A function which serves as a getter for the property
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283. ### How do you extend classes
The `extends` keyword is used in class declarations/expressions to create a class which is a child of another class. It can be used to subclass custom classes as well as built-in objects. The syntax would be as below,
```javascript
class ChildClass extends ParentClass { ... }
```
Let's take an example of Square subclass from Polygon parent class,
```javascript
class Square extends Rectangle {
constructor(length) {
super(length, length);
this.name = "Square";
}
get area() {
return this.width * this.height;
}
set area(value) {
this.area = value;
}
}
```
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284. ### How do I modify the url without reloading the page
The `window.location.href` property will be helpful to modify the url but it reloads the page. HTML5 introduced the `history.pushState()` and `history.replaceState()` methods, which allow you to add and modify history entries, respectively. For example, you can use pushState as below,
```javascript
window.history.pushState("page2", "Title", "/page2.html");
```
**[⬆ Back to Top](#table-of-contents)**
285. ### How do you check whether an array includes a particular value or not
The `Array#includes()` method is used to determine whether an array includes a particular value among its entries by returning either true or false. Let's see an example to find an element(numeric and string) within an array.
```javascript
var numericArray = [1, 2, 3, 4];
console.log(numericArray.includes(3)); // true
var stringArray = ["green", "yellow", "blue"];
console.log(stringArray.includes("blue")); //true
```
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286. ### How do you compare scalar arrays
You can use length and every method of arrays to compare two scalar(compared directly using ===) arrays. The combination of these expressions can give the expected result,
```javascript
const arrayFirst = [1, 2, 3, 4, 5];
const arraySecond = [1, 2, 3, 4, 5];
console.log(
arrayFirst.length === arraySecond.length &&
arrayFirst.every((value, index) => value === arraySecond[index])
); // true
```
If you would like to compare arrays irrespective of order then you should sort them before,
```javascript
const arrayFirst = [2, 3, 1, 4, 5];
const arraySecond = [1, 2, 3, 4, 5];
console.log(
arrayFirst.length === arraySecond.length &&
arrayFirst.sort().every((value, index) => value === arraySecond[index])
); //true
```
**[⬆ Back to Top](#table-of-contents)**
287. ### How to get the value from get parameters
The `new URL()` object accepts the url string and `searchParams` property of this object can be used to access the get parameters. Remember that you may need to use polyfill or `window.location` to access the URL in older browsers(including IE).
```javascript
let urlString = "http://www.some-domain.com/about.html?x=1&y=2&z=3"; //window.location.href
let url = new URL(urlString);
let parameterZ = url.searchParams.get("z");
console.log(parameterZ); // 3
```
**[⬆ Back to Top](#table-of-contents)**
288. ### How do you print numbers with commas as thousand separators
You can use the `Number.prototype.toLocaleString()` method which returns a string with a language-sensitive representation such as thousand separator,currency etc of this number.
```javascript
function convertToThousandFormat(x) {
return x.toLocaleString(); // 12,345.679
}
console.log(convertToThousandFormat(12345.6789));
```
**[⬆ Back to Top](#table-of-contents)**
289. ### What is the difference between java and javascript
Both are totally unrelated programming languages and no relation between them. Java is statically typed, compiled, runs on its own VM. Whereas Javascript is dynamically typed, interpreted, and runs in a browser and nodejs environments. Let's see the major differences in a tabular format,
| Feature | Java | JavaScript |
|---- | ---- | -----
| Typed | It's a strongly typed language | It's a dynamic typed language |
| Paradigm | Object oriented programming | Prototype based programming |
| Scoping | Block scoped | Function-scoped |
| Concurrency | Thread based | event based |
| Memory | Uses more memory | Uses less memory. Hence it will be used for web pages |
**[⬆ Back to Top](#table-of-contents)**
290. ### Does JavaScript supports namespace
JavaScript doesn’t support namespace by default. So if you create any element(function, method, object, variable) then it becomes global and pollutes the global namespace. Let's take an example of defining two functions without any namespace,
```javascript
function func1() {
console.log("This is a first definition");
}
function func1() {
console.log("This is a second definition");
}
func1(); // This is a second definition
```
It always calls the second function definition. In this case, namespace will solve the name collision problem.
**[⬆ Back to Top](#table-of-contents)**
291. ### How do you declare namespace
Even though JavaScript lacks namespaces, we can use Objects , IIFE to create namespaces.
1. **Using Object Literal Notation:** Let's wrap variables and functions inside an Object literal which acts as a namespace. After that you can access them using object notation
```javascript
var namespaceOne = {
function func1() {
console.log("This is a first definition");
}
}
var namespaceTwo = {
function func1() {
console.log("This is a second definition");
}
}
namespaceOne.func1(); // This is a first definition
namespaceTwo.func1(); // This is a second definition
```
1. **Using IIFE (Immediately invoked function expression):** The outer pair of parentheses of IIFE creates a local scope for all the code inside of it and makes the anonymous function a function expression. Due to that, you can create the same function in two different function expressions to act as a namespace.
```javascript
(function () {
function fun1() {
console.log("This is a first definition");
}
fun1();
})();
(function () {
function fun1() {
console.log("This is a second definition");
}
fun1();
})();
```
1. **Using a block and a let/const declaration:** In ECMAScript 6, you can simply use a block and a let declaration to restrict the scope of a variable to a block.
```javascript
{
let myFunction = function fun1() {
console.log("This is a first definition");
};
myFunction();
}
//myFunction(): ReferenceError: myFunction is not defined.
{
let myFunction = function fun1() {
console.log("This is a second definition");
};
myFunction();
}
//myFunction(): ReferenceError: myFunction is not defined.
```
**[⬆ Back to Top](#table-of-contents)**
292. ### How do you invoke javascript code in an iframe from parent page
Initially iFrame needs to be accessed using either `document.getElementBy` or `window.frames`. After that `contentWindow` property of iFrame gives the access for targetFunction
```javascript
document.getElementById("targetFrame").contentWindow.targetFunction();
window.frames[0].frameElement.contentWindow.targetFunction(); // Accessing iframe this way may not work in latest versions chrome and firefox
```
**[⬆ Back to Top](#table-of-contents)**
293. ### How do get the timezone offset from date
You can use the `getTimezoneOffset` method of the date object. This method returns the time zone difference, in minutes, from current locale (host system settings) to UTC
```javascript
var offset = new Date().getTimezoneOffset();
console.log(offset); // -480
```
**[⬆ Back to Top](#table-of-contents)**
294. ### How do you load CSS and JS files dynamically
You can create both link and script elements in the DOM and append them as child to head tag. Let's create a function to add script and style resources as below,
```javascript
function loadAssets(filename, filetype) {
if (filetype == "css") {
// External CSS file
var fileReference = document.createElement("link");
fileReference.setAttribute("rel", "stylesheet");
fileReference.setAttribute("type", "text/css");
fileReference.setAttribute("href", filename);
} else if (filetype == "js") {
// External JavaScript file
var fileReference = document.createElement("script");
fileReference.setAttribute("type", "text/javascript");
fileReference.setAttribute("src", filename);
}
if (typeof fileReference != "undefined")
document.getElementsByTagName("head")[0].appendChild(fileReference);
}
```
**[⬆ Back to Top](#table-of-contents)**
295. ### What are the different methods to find HTML elements in DOM
If you want to access any element in an HTML page, you need to start with accessing the document object. Later you can use any of the below methods to find the HTML element,
1. document.getElementById(id): It finds an element by Id
2. document.getElementsByTagName(name): It finds an element by tag name
3. document.getElementsByClassName(name): It finds an element by class name
**[⬆ Back to Top](#table-of-contents)**
296. ### What is jQuery
jQuery is a popular cross-browser JavaScript library that provides Document Object Model (DOM) traversal, event handling, animations and AJAX interactions by minimizing the discrepancies across browsers. It is widely famous with its philosophy of “Write less, do more”. For example, you can display welcome message on the page load using jQuery as below,
```javascript
$(document).ready(function () {
// It selects the document and apply the function on page load
alert("Welcome to jQuery world");
});
```
**Note:** You can download it from jquery's official site or install it from CDNs, like google.
**[⬆ Back to Top](#table-of-contents)**
297. ### What is V8 JavaScript engine
V8 is an open source high-performance JavaScript engine used by the Google Chrome browser, written in C++. It is also being used in the node.js project. It implements ECMAScript and WebAssembly, and runs on Windows 7 or later, macOS 10.12+, and Linux systems that use x64, IA-32, ARM, or MIPS processors.
**Note:** It can run standalone, or can be embedded into any C++ application.
**[⬆ Back to Top](#table-of-contents)**
298. ### Why do we call javascript as dynamic language
JavaScript is a loosely typed or a dynamic language because variables in JavaScript are not directly associated with any particular value type, and any variable can be assigned/reassigned with values of all types.
```javascript
let age = 50; // age is a number now
age = "old"; // age is a string now
age = true; // age is a boolean
```
**[⬆ Back to Top](#table-of-contents)**
299. ### What is a void operator
The `void` operator evaluates the given expression and then returns undefined(i.e, without returning value). The syntax would be as below,
```javascript
void expression;
void expression;
```
Let's display a message without any redirection or reload
```javascript
<a href="javascript:void(alert('Welcome to JS world'))">
Click here to see a message
</a>
```
**Note:** This operator is often used to obtain the undefined primitive value, using "void(0)".
**[⬆ Back to Top](#table-of-contents)**
300. ### How to set the cursor to wait
The cursor can be set to wait in JavaScript by using the property "cursor". Let's perform this behavior on page load using the below function.
```javascript
function myFunction() {
window.document.body.style.cursor = "wait";
}
```
and this function invoked on page load
```html
<body onload="myFunction()"></body>
```
**[⬆ Back to Top](#table-of-contents)**
301. ### How do you create an infinite loop
You can create infinite loops using for and while loops without using any expressions. The for loop construct or syntax is better approach in terms of ESLint and code optimizer tools,
```javascript
for (;;) {}
while (true) {}
```
**[⬆ Back to Top](#table-of-contents)**
302. ### Why do you need to avoid with statement
JavaScript's with statement was intended to provide a shorthand for writing recurring accesses to objects. So it can help reduce file size by reducing the need to repeat a lengthy object reference without performance penalty. Let's take an example where it is used to avoid redundancy when accessing an object several times.
```javascript
a.b.c.greeting = "welcome";
a.b.c.age = 32;
```
Using `with` it turns this into:
```javascript
with (a.b.c) {
greeting = "welcome";
age = 32;
}
```
But this `with` statement creates performance problems since one cannot predict whether an argument will refer to a real variable or to a property inside the with argument.
**[⬆ Back to Top](#table-of-contents)**
303. ### What is the output of below for loops
```javascript
for (var i = 0; i < 4; i++) {
// global scope
setTimeout(() => console.log(i));
}
for (let i = 0; i < 4; i++) {
// block scope
setTimeout(() => console.log(i));
}
```
The output of the above for loops is 4 4 4 4 and 0 1 2 3
**Explanation:** Due to the event queue/loop of javascript, the `setTimeout` callback function is called after the loop has been executed. Since the variable i is declared with the `var` keyword it became a global variable and the value was equal to 4 using iteration when the time `setTimeout` function is invoked. Hence, the output of the first loop is `4 4 4 4`.
Whereas in the second loop, the variable i is declared as the `let` keyword it becomes a block scoped variable and it holds a new value(0, 1 ,2 3) for each iteration. Hence, the output of the first loop is `0 1 2 3`.
**[⬆ Back to Top](#table-of-contents)**
304. ### List down some of the features of ES6
Below are the list of some new features of ES6,
1. Support for constants or immutable variables
2. Block-scope support for variables, constants and functions
3. Arrow functions
4. Default parameters
5. Rest and Spread Parameters
6. Template Literals
7. Multi-line Strings
8. Destructuring Assignment
9. Enhanced Object Literals
10. Promises
11. Classes
12. Modules
**[⬆ Back to Top](#table-of-contents)**
305. ### What is ES6
ES6 is the sixth edition of the javascript language and it was released in June 2015. It was initially known as ECMAScript 6 (ES6) and later renamed to ECMAScript 2015. Almost all the modern browsers support ES6 but for the old browsers there are many transpilers, like Babel.js etc.
**[⬆ Back to Top](#table-of-contents)**
306. ### Can I redeclare let and const variables
No, you cannot redeclare let and const variables. If you do, it throws below error
```bash
Uncaught SyntaxError: Identifier 'someVariable' has already been declared
```
**Explanation:** The variable declaration with `var` keyword refers to a function scope and the variable is treated as if it were declared at the top of the enclosing scope due to hoisting feature. So all the multiple declarations contributing to the same hoisted variable without any error. Let's take an example of re-declaring variables in the same scope for both var and let/const variables.
```javascript
var name = "John";
function myFunc() {
var name = "Nick";
var name = "Abraham"; // Re-assigned in the same function block
alert(name); // Abraham
}
myFunc();
alert(name); // John
```
The block-scoped multi-declaration throws syntax error,
```javascript
let name = "John";
function myFunc() {
let name = "Nick";
let name = "Abraham"; // Uncaught SyntaxError: Identifier 'name' has already been declared
alert(name);
}
myFunc();
alert(name);
```
**[⬆ Back to Top](#table-of-contents)**
307. ### Is const variable makes the value immutable
No, the const variable doesn't make the value immutable. But it disallows subsequent assignments(i.e, You can declare with assignment but can't assign another value later)
```javascript
const userList = [];
userList.push("John"); // Can mutate even though it can't re-assign
console.log(userList); // ['John']
```
**[⬆ Back to Top](#table-of-contents)**
308. ### What are default parameters
In ES5, we need to depend on logical OR operators to handle default values of function parameters. Whereas in ES6, Default function parameters feature allows parameters to be initialized with default values if no value or undefined is passed. Let's compare the behavior with an examples,
```javascript
//ES5
var calculateArea = function (height, width) {
height = height || 50;
width = width || 60;
return width * height;
};
console.log(calculateArea()); //300
```
The default parameters makes the initialization more simpler,
```javascript
//ES6
var calculateArea = function (height = 50, width = 60) {
return width * height;
};
console.log(calculateArea()); //300
```
**[⬆ Back to Top](#table-of-contents)**
309. ### What are template literals
Template literals or template strings are string literals allowing embedded expressions. These are enclosed by the back-tick (`) character instead of double or single quotes.
In ES6, this feature enables using dynamic expressions as below,
```javascript
var greeting = `Welcome to JS World, Mr. ${firstName} ${lastName}.`;
```
In ES5, you need break string like below,
```javascript
var greeting = 'Welcome to JS World, Mr. ' + firstName + ' ' + lastName.`
```
**Note:** You can use multi-line strings and string interpolation features with template literals.
**[⬆ Back to Top](#table-of-contents)**
310. ### How do you write multi-line strings in template literals
In ES5, you would have to use newline escape characters('\\n') and concatenation symbols(+) in order to get multi-line strings.
```javascript
console.log("This is string sentence 1\n" + "This is string sentence 2");
```
Whereas in ES6, You don't need to mention any newline sequence character,
```javascript
console.log(`This is string sentence
'This is string sentence 2`);
```
**[⬆ Back to Top](#table-of-contents)**
311. ### What are nesting templates
The nesting template is a feature supported within template literals syntax to allow inner backticks inside a placeholder ${ } within the template. For example, the below nesting template is used to display the icons based on user permissions whereas outer template checks for platform type,
```javascript
const iconStyles = `icon ${
isMobilePlatform()
? ""
: `icon-${user.isAuthorized ? "submit" : "disabled"}`
}`;
```
You can write the above use case without nesting template features as well. However, the nesting template feature is more compact and readable.
```javascript
//Without nesting templates
const iconStyles = `icon ${
isMobilePlatform()
? ""
: user.isAuthorized
? "icon-submit"
: "icon-disabled"
}`;
```
**[⬆ Back to Top](#table-of-contents)**
312. ### What are tagged templates
Tagged templates are the advanced form of templates in which tags allow you to parse template literals with a function. The tag function accepts the first parameter as an array of strings and remaining parameters as expressions. This function can also return manipulated strings based on parameters. Let's see the usage of this tagged template behavior of an IT professional skill set in an organization,
```javascript
var user1 = "John";
var skill1 = "JavaScript";
var experience1 = 15;
var user2 = "Kane";
var skill2 = "JavaScript";
var experience2 = 5;
function myInfoTag(strings, userExp, experienceExp, skillExp) {
var str0 = strings[0]; // "Mr/Ms. "
var str1 = strings[1]; // " is a/an "
var str2 = strings[2]; // "in"
var expertiseStr;
if (experienceExp > 10) {
expertiseStr = "expert developer";
} else if (skillExp > 5 && skillExp <= 10) {
expertiseStr = "senior developer";
} else {
expertiseStr = "junior developer";
}
return `${str0}${userExp}${str1}${expertiseStr}${str2}${skillExp}`;
}
var output1 = myInfoTag`Mr/Ms. ${user1} is a/an ${experience1} in ${skill1}`;
var output2 = myInfoTag`Mr/Ms. ${user2} is a/an ${experience2} in ${skill2}`;
console.log(output1); // Mr/Ms. John is a/an expert developer in JavaScript
console.log(output2); // Mr/Ms. Kane is a/an junior developer in JavaScript
```
**[⬆ Back to Top](#table-of-contents)**
313. ### What are raw strings
ES6 provides a raw strings feature using the `String.raw()` method which is used to get the raw string form of template strings. This feature allows you to access the raw strings as they were entered, without processing escape sequences. For example, the usage would be as below,
```javascript
var calculationString = String.raw`The sum of numbers is \n${
1 + 2 + 3 + 4
}!`;
console.log(calculationString); // The sum of numbers is \n10!
```
If you don't use raw strings, the newline character sequence will be processed by displaying the output in multiple lines
```javascript
var calculationString = `The sum of numbers is \n${1 + 2 + 3 + 4}!`;
console.log(calculationString);
// The sum of numbers is
// 10!
```
Also, the raw property is available on the first argument to the tag function
```javascript
function tag(strings) {
console.log(strings.raw[0]);
}
```
**[⬆ Back to Top](#table-of-contents)**
314. ### What is destructuring assignment
The destructuring assignment is a JavaScript expression that makes it possible to unpack values from arrays or properties from objects into distinct variables.
Let's get the month values from an array using destructuring assignment
```javascript
var [one, two, three] = ["JAN", "FEB", "MARCH"];
console.log(one); // "JAN"
console.log(two); // "FEB"
console.log(three); // "MARCH"
```
and you can get user properties of an object using destructuring assignment,
```javascript
var { name, age } = { name: "John", age: 32 };
console.log(name); // John
console.log(age); // 32
```
**[⬆ Back to Top](#table-of-contents)**
315. ### What are default values in destructuring assignment
A variable can be assigned a default value when the value unpacked from the array or object is undefined during destructuring assignment. It helps to avoid setting default values separately for each assignment. Let's take an example for both arrays and object use cases,
**Arrays destructuring:**
```javascript
var x, y, z;
[x = 2, y = 4, z = 6] = [10];
console.log(x); // 10
console.log(y); // 4
console.log(z); // 6
```
**Objects destructuring:**
```javascript
var { x = 2, y = 4, z = 6 } = { x: 10 };
console.log(x); // 10
console.log(y); // 4
console.log(z); // 6
```
**[⬆ Back to Top](#table-of-contents)**
316. ### How do you swap variables in destructuring assignment
If you don't use destructuring assignment, swapping two values requires a temporary variable. Whereas using a destructuring feature, two variable values can be swapped in one destructuring expression. Let's swap two number variables in array destructuring assignment,
```javascript
var x = 10,
y = 20;
[x, y] = [y, x];
console.log(x); // 20
console.log(y); // 10
```
**[⬆ Back to Top](#table-of-contents)**
317. ### What are enhanced object literals
Object literals make it easy to quickly create objects with properties inside the curly braces. For example, it provides shorter syntax for common object property definition as below.
```javascript
//ES6
var x = 10,
y = 20;
obj = { x, y };
console.log(obj); // {x: 10, y:20}
//ES5
var x = 10,
y = 20;
obj = { x: x, y: y };
console.log(obj); // {x: 10, y:20}
```
**[⬆ Back to Top](#table-of-contents)**
318. ### What are dynamic imports
The dynamic imports using `import()` function syntax allows us to load modules on demand by using promises or the async/await syntax. Currently this feature is in [stage4 proposal](https://github.com/tc39/proposal-dynamic-import). The main advantage of dynamic imports is reduction of our bundle's sizes, the size/payload response of our requests and overall improvements in the user experience.
The syntax of dynamic imports would be as below,
```javascript
import("./Module").then((Module) => Module.method());
```
**[⬆ Back to Top](#table-of-contents)**
319. ### What are the use cases for dynamic imports
Below are some of the use cases of using dynamic imports over static imports,
1. Import a module on-demand or conditionally. For example, if you want to load a polyfill on legacy browser
```javascript
if (isLegacyBrowser()) {
import(···)
.then(···);
}
```
1. Compute the module specifier at runtime. For example, you can use it for internationalization.
```javascript
import(`messages_${getLocale()}.js`).then(···);
```
1. Import a module from within a regular script instead a module.
**[⬆ Back to Top](#table-of-contents)**
320. ### What are typed arrays
Typed arrays are array-like objects from ECMAScript 6 API for handling binary data. JavaScript provides 8 Typed array types,
1. Int8Array: An array of 8-bit signed integers
2. Int16Array: An array of 16-bit signed integers
3. Int32Array: An array of 32-bit signed integers
4. Uint8Array: An array of 8-bit unsigned integers
5. Uint16Array: An array of 16-bit unsigned integers
6. Uint32Array: An array of 32-bit unsigned integers
7. Float32Array: An array of 32-bit floating point numbers
8. Float64Array: An array of 64-bit floating point numbers
For example, you can create an array of 8-bit signed integers as below
```javascript
const a = new Int8Array();
// You can pre-allocate n bytes
const bytes = 1024;
const a = new Int8Array(bytes);
```
**[⬆ Back to Top](#table-of-contents)**
321. ### What are the advantages of module loaders
The module loaders provides the below features,
1. Dynamic loading
2. State isolation
3. Global namespace isolation
4. Compilation hooks
5. Nested virtualization
**[⬆ Back to Top](#table-of-contents)**
322. ### What is collation
Collation is used for sorting a set of strings and searching within a set of strings. It is parameterized by locale and aware of Unicode. Let's take comparison and sorting features,
1. **Comparison:**
```javascript
var list = ["ä", "a", "z"]; // In German, "ä" sorts with "a" Whereas in Swedish, "ä" sorts after "z"
var l10nDE = new Intl.Collator("de");
var l10nSV = new Intl.Collator("sv");
console.log(l10nDE.compare("ä", "z") === -1); // true
console.log(l10nSV.compare("ä", "z") === +1); // true
```
1. **Sorting:**
```javascript
var list = ["ä", "a", "z"]; // In German, "ä" sorts with "a" Whereas in Swedish, "ä" sorts after "z"
var l10nDE = new Intl.Collator("de");
var l10nSV = new Intl.Collator("sv");
console.log(list.sort(l10nDE.compare)); // [ "a", "ä", "z" ]
console.log(list.sort(l10nSV.compare)); // [ "a", "z", "ä" ]
```
**[⬆ Back to Top](#table-of-contents)**
323. ### What is for...of statement
The for...of statement creates a loop iterating over iterable objects or elements such as built-in String, Array, Array-like objects (like arguments or NodeList), TypedArray, Map, Set, and user-defined iterables. The basic usage of for...of statement on arrays would be as below,
```javascript
let arrayIterable = [10, 20, 30, 40, 50];
for (let value of arrayIterable) {
value++;
console.log(value); // 11 21 31 41 51
}
```
**[⬆ Back to Top](#table-of-contents)**
324. ### What is the output of below spread operator array
```javascript
[..."John Resig"];
```
The output of the array is ['J', 'o', 'h', 'n', '', 'R', 'e', 's', 'i', 'g']
**Explanation:** The string is an iterable type and the spread operator within an array maps every character of an iterable to one element. Hence, each character of a string becomes an element within an Array.
**[⬆ Back to Top](#table-of-contents)**
325. ### Is PostMessage secure
Yes, postMessages can be considered very secure as long as the programmer/developer is careful about checking the origin and source of an arriving message. But if you try to send/receive a message without verifying its source will create cross-site scripting attacks.
**[⬆ Back to Top](#table-of-contents)**
326. ### What are the problems with postmessage target origin as wildcard
The second argument of postMessage method specifies which origin is allowed to receive the message. If you use the wildcard “\*” as an argument then any origin is allowed to receive the message. In this case, there is no way for the sender window to know if the target window is at the target origin when sending the message. If the target window has been navigated to another origin, the other origin would receive the data. Hence, this may lead to XSS vulnerabilities.
```javascript
targetWindow.postMessage(message, "*");
```
**[⬆ Back to Top](#table-of-contents)**
327. ### How do you avoid receiving postMessages from attackers
Since the listener listens for any message, an attacker can trick the application by sending a message from the attacker’s origin, which gives an impression that the receiver received the message from the actual sender’s window. You can avoid this issue by validating the origin of the message on the receiver's end using the “message.origin” attribute. For examples, let's check the sender's origin [http://www.some-sender.com](http://www.some-sender.com) on receiver side [www.some-receiver.com](www.some-receiver.com),
```javascript
//Listener on http://www.some-receiver.com/
window.addEventListener("message", function(message){
if(/^http://www\.some-sender\.com$/.test(message.origin)){
console.log('You received the data from valid sender', message.data);
}
});
```
**[⬆ Back to Top](#table-of-contents)**
328. ### Can I avoid using postMessages completely
You cannot avoid using postMessages completely(or 100%). Even though your application doesn’t use postMessage considering the risks, a lot of third party scripts use postMessage to communicate with the third party service. So your application might be using postMessage without your knowledge.
**[⬆ Back to Top](#table-of-contents)**
329. ### Is postMessages synchronous
The postMessages are synchronous in IE8 browser but they are asynchronous in IE9 and all other modern browsers (i.e, IE9+, Firefox, Chrome, Safari).Due to this asynchronous behaviour, we use a callback mechanism when the postMessage is returned.
**[⬆ Back to Top](#table-of-contents)**
330. ### What paradigm is Javascript
JavaScript is a multi-paradigm language, supporting imperative/procedural programming, Object-Oriented Programming and functional programming. JavaScript supports Object-Oriented Programming with prototypical inheritance.
**[⬆ Back to Top](#table-of-contents)**
331. ### What is the difference between internal and external javascript
**Internal JavaScript:** It is the source code within the script tag.
**External JavaScript:** The source code is stored in an external file(stored with .js extension) and referred with in the tag.
**[⬆ Back to Top](#table-of-contents)**
332. ### Is JavaScript faster than server side script
Yes, JavaScript is faster than server side scripts. Because JavaScript is a client-side script it does not require any web server’s help for its computation or calculation. So JavaScript is always faster than any server-side script like ASP, PHP, etc.
**[⬆ Back to Top](#table-of-contents)**
333. ### How do you get the status of a checkbox
You can apply the `checked` property on the selected checkbox in the DOM. If the value is `true` it means the checkbox is checked, otherwise it is unchecked. For example, the below HTML checkbox element can be access using javascript as below:
```html
<input type="checkbox" id="checkboxname" value="Agree" /> Agree the
conditions<br />
```
```javascript
console.log(document.getElementById(‘checkboxname’).checked); // true or false
```
**[⬆ Back to Top](#table-of-contents)**
334. ### What is the purpose of double tilde operator
The double tilde operator(~~) is known as double NOT bitwise operator. This operator is a slightly quicker substitute for Math.floor().
**[⬆ Back to Top](#table-of-contents)**
335. ### How do you convert character to ASCII code
You can use the `String.prototype.charCodeAt()` method to convert string characters to ASCII numbers. For example, let's find ASCII code for the first letter of 'ABC' string,
```javascript
"ABC".charCodeAt(0); // returns 65
```
Whereas `String.fromCharCode()` method converts numbers to equal ASCII characters.
```javascript
String.fromCharCode(65, 66, 67); // returns 'ABC'
```
**[⬆ Back to Top](#table-of-contents)**
336. ### What is ArrayBuffer
An ArrayBuffer object is used to represent a generic, fixed-length raw binary data buffer. You can create it as below,
```javascript
let buffer = new ArrayBuffer(16); // create a buffer of length 16
alert(buffer.byteLength); // 16
```
To manipulate an ArrayBuffer, we need to use a “view” object.
```javascript
//Create a DataView referring to the buffer
let view = new DataView(buffer);
```
**[⬆ Back to Top](#table-of-contents)**
337. ### What is the output of below string expression
```javascript
console.log("Welcome to JS world"[0]);
```
The output of the above expression is "W".
**Explanation:** The bracket notation with specific index on a string returns the character at a specific location. Hence, it returns the character "W" of the string. Since this is not supported in IE7 and below versions, you may need to use the .charAt() method to get the desired result.
**[⬆ Back to Top](#table-of-contents)**
338. ### What is the purpose of Error object
The Error constructor creates an error object and the instances of error objects are thrown when runtime errors occur. The Error object can also be used as a base object for user-defined exceptions. The syntax of error object would be as below,
```javascript
new Error([message[, fileName[, lineNumber]]])
```
You can throw user defined exceptions or errors using Error object in try...catch block as below,
```javascript
try {
if (withdraw > balance)
throw new Error("Oops! You don't have enough balance");
} catch (e) {
console.log(e.name + ": " + e.message);
}
```
**[⬆ Back to Top](#table-of-contents)**
339. ### What is the purpose of EvalError object
The EvalError object indicates an error regarding the global `eval()` function. Even though this exception is not thrown by JavaScript anymore, the EvalError object remains for compatibility. The syntax of this expression would be as below,
```javascript
new EvalError([message[, fileName[, lineNumber]]])
```
You can throw EvalError with in try...catch block as below,
```javascript
try {
throw new EvalError('Eval function error', 'someFile.js', 100);
} catch (e) {
console.log(e.message, e.name, e.fileName); // "Eval function error", "EvalError", "someFile.js"
```
**[⬆ Back to Top](#table-of-contents)**
340. ### What are the list of cases error thrown from non-strict mode to strict mode
When you apply 'use strict'; syntax, some of the below cases will throw a SyntaxError before executing the script
1. When you use Octal syntax
```javascript
var n = 022;
```
1. Using `with` statement
2. When you use delete operator on a variable name
3. Using eval or arguments as variable or function argument name
4. When you use newly reserved keywords
5. When you declare a function in a block
```javascript
if (someCondition) {
function f() {}
}
```
Hence, the errors from above cases are helpful to avoid errors in development/production environments.
**[⬆ Back to Top](#table-of-contents)**
341. ### Do all objects have prototypes
No. All objects have prototypes except for the base object which is created by the user, or an object that is created using the new keyword.
**[⬆ Back to Top](#table-of-contents)**
342. ### What is the difference between a parameter and an argument
Parameter is the variable name of a function definition whereas an argument represents the value given to a function when it is invoked. Let's explain this with a simple function
```javascript
function myFunction(parameter1, parameter2, parameter3) {
console.log(arguments[0]); // "argument1"
console.log(arguments[1]); // "argument2"
console.log(arguments[2]); // "argument3"
}
myFunction("argument1", "argument2", "argument3");
```
**[⬆ Back to Top](#table-of-contents)**
343. ### What is the purpose of some method in arrays
The some() method is used to test whether at least one element in the array passes the test implemented by the provided function. The method returns a boolean value. Let's take an example to test for any odd elements,
```javascript
var array = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
var odd = (element) => element % 2 !== 0;
console.log(array.some(odd)); // true (the odd element exists)
```
**[⬆ Back to Top](#table-of-contents)**
344. ### How do you combine two or more arrays
The concat() method is used to join two or more arrays by returning a new array containing all the elements. The syntax would be as below,
```javascript
array1.concat(array2, array3, ..., arrayX)
```
Let's take an example of array's concatenation with veggies and fruits arrays,
```javascript
var veggies = ["Tomato", "Carrot", "Cabbage"];
var fruits = ["Apple", "Orange", "Pears"];
var veggiesAndFruits = veggies.concat(fruits);
console.log(veggiesAndFruits); // Tomato, Carrot, Cabbage, Apple, Orange, Pears
```
**[⬆ Back to Top](#table-of-contents)**
345. ### What is the difference between Shallow and Deep copy
There are two ways to copy an object,
**Shallow Copy:**
Shallow copy is a bitwise copy of an object. A new object is created that has an exact copy of the values in the original object. If any of the fields of the object are references to other objects, just the reference addresses are copied i.e., only the memory address is copied.
**Example**
```javascript
var empDetails = {
name: "John",
age: 25,
expertise: "Software Developer",
};
```
to create a duplicate
```javascript
var empDetailsShallowCopy = empDetails; //Shallow copying!
```
if we change some property value in the duplicate one like this:
```javascript
empDetailsShallowCopy.name = "Johnson";
```
The above statement will also change the name of `empDetails`, since we have a shallow copy. That means we're losing the original data as well.
**Deep copy:**
A deep copy copies all fields, and makes copies of dynamically allocated memory pointed to by the fields. A deep copy occurs when an object is copied along with the objects to which it refers.
**Example**
```javascript
var empDetails = {
name: "John",
age: 25,
expertise: "Software Developer",
};
```
Create a deep copy by using the properties from the original object into new variable
```javascript
var empDetailsDeepCopy = {
name: empDetails.name,
age: empDetails.age,
expertise: empDetails.expertise,
};
```
Now if you change `empDetailsDeepCopy.name`, it will only affect `empDetailsDeepCopy` & not `empDetails`
**[⬆ Back to Top](#table-of-contents)**
346. ### How do you create specific number of copies of a string
The `repeat()` method is used to construct and return a new string which contains the specified number of copies of the string on which it was called, concatenated together. Remember that this method has been added to the ECMAScript 2015 specification.
Let's take an example of Hello string to repeat it 4 times,
```javascript
"Hello".repeat(4); // 'HelloHelloHelloHello'
```
347. ### How do you return all matching strings against a regular expression
The `matchAll()` method can be used to return an iterator of all results matching a string against a regular expression. For example, the below example returns an array of matching string results against a regular expression,
```javascript
let regexp = /Hello(\d?))/g;
let greeting = "Hello1Hello2Hello3";
let greetingList = [...greeting.matchAll(regexp)];
console.log(greetingList[0]); //Hello1
console.log(greetingList[1]); //Hello2
console.log(greetingList[2]); //Hello3
```
**[⬆ Back to Top](#table-of-contents)**
348. ### How do you trim a string at the beginning or ending
The `trim` method of string prototype is used to trim on both sides of a string. But if you want to trim especially at the beginning or ending of the string then you can use `trimStart/trimLeft` and `trimEnd/trimRight` methods. Let's see an example of these methods on a greeting message,
```javascript
var greeting = " Hello, Goodmorning! ";
console.log(greeting); // " Hello, Goodmorning! "
console.log(greeting.trimStart()); // "Hello, Goodmorning! "
console.log(greeting.trimLeft()); // "Hello, Goodmorning! "
console.log(greeting.trimEnd()); // " Hello, Goodmorning!"
console.log(greeting.trimRight()); // " Hello, Goodmorning!"
```
**[⬆ Back to Top](#table-of-contents)**
349. ### What is the output of below console statement with unary operator
Let's take console statement with unary operator as given below,
```javascript
console.log(+"Hello");
```
The output of the above console log statement returns NaN. Because the element is prefixed by the unary operator and the JavaScript interpreter will try to convert that element into a number type. Since the conversion fails, the value of the statement results in NaN value.
**[⬆ Back to Top](#table-of-contents)**
350. ### Does javascript uses mixins
Mixin is a generic object-oriented programming term - is a class containing methods that can be used by other classes without a need to inherit from it. In JavaScript we can only inherit from a single object. ie. There can be only one `[[prototype]]` for an object.
But sometimes we require to extend more than one, to overcome this we can use Mixin which helps to copy methods to the prototype of another class.
Say for instance, we've two classes `User` and `CleanRoom`. Suppose we need to add `CleanRoom` functionality to `User`, so that user can clean the room at demand. Here's where concept called mixins comes into picture.
```javascript
// mixin
let cleanRoomMixin = {
cleanRoom() {
alert(`Hello ${this.name}, your room is clean now`);
},
sayBye() {
alert(`Bye ${this.name}`);
},
};
// usage:
class User {
constructor(name) {
this.name = name;
}
}
// copy the methods
Object.assign(User.prototype, cleanRoomMixin);
// now User can clean the room
new User("Dude").cleanRoom(); // Hello Dude, your room is clean now!
```
**[⬆ Back to Top](#table-of-contents)**
351. ### What is a thunk function
A thunk is just a function which delays the evaluation of the value. It doesn’t take any arguments but gives the value whenever you invoke the thunk. i.e, It is used not to execute now but it will be sometime in the future. Let's take a synchronous example,
```javascript
const add = (x, y) => x + y;
const thunk = () => add(2, 3);
thunk(); // 5
```
**[⬆ Back to Top](#table-of-contents)**
352. ### What are asynchronous thunks
The asynchronous thunks are useful to make network requests. Let's see an example of network requests,
```javascript
function fetchData(fn) {
fetch("https://jsonplaceholder.typicode.com/todos/1")
.then((response) => response.json())
.then((json) => fn(json));
}
const asyncThunk = function () {
return fetchData(function getData(data) {
console.log(data);
});
};
asyncThunk();
```
The `getData` function won't be called immediately but it will be invoked only when the data is available from API endpoint. The setTimeout function is also used to make our code asynchronous. The best real time example is redux state management library which uses the asynchronous thunks to delay the actions to dispatch.
**[⬆ Back to Top](#table-of-contents)**
353. ### What is the output of below function calls
**Code snippet:**
```javascript
const circle = {
radius: 20,
diameter() {
return this.radius * 2;
},
perimeter: () => 2 * Math.PI * this.radius,
};
```
```javascript
console.log(circle.diameter());
console.log(circle.perimeter());
```
**Output:**
The output is 40 and NaN. Remember that diameter is a regular function, whereas the value of perimeter is an arrow function. The `this` keyword of a regular function(i.e, diameter) refers to the surrounding scope which is a class(i.e, Shape object). Whereas this keyword of perimeter function refers to the surrounding scope which is a window object. Since there is no radius property on window objects it returns an undefined value and the multiple of number value returns NaN value.
**[⬆ Back to Top](#table-of-contents)**
354. ### How to remove all line breaks from a string
The easiest approach is using regular expressions to detect and replace newlines in the string. In this case, we use replace function along with string to replace with, which in our case is an empty string.
```javascript
function remove_linebreaks( var message ) {
return message.replace( /[\r\n]+/gm, "" );
}
```
In the above expression, g and m are for global and multiline flags.
**[⬆ Back to Top](#table-of-contents)**
355. ### What is the difference between reflow and repaint
A _repaint_ occurs when changes are made which affect the visibility of an element, but not its layout. Examples of this include outline, visibility, or background color. A _reflow_ involves changes that affect the layout of a portion of the page (or the whole page). Resizing the browser window, changing the font, content changing (such as user typing text), using JavaScript methods involving computed styles, adding or removing elements from the DOM, and changing an element's classes are a few of the things that can trigger reflow. Reflow of an element causes the subsequent reflow of all child and ancestor elements as well as any elements following it in the DOM.
**[⬆ Back to Top](#table-of-contents)**
356. ### What happens with negating an array
Negating an array with `!` character will coerce the array into a boolean. Since Arrays are considered to be truthy So negating it will return `false`.
```javascript
console.log(![]); // false
```
**[⬆ Back to Top](#table-of-contents)**
357. ### What happens if we add two arrays
If you add two arrays together, it will convert them both to strings and concatenate them. For example, the result of adding arrays would be as below,
```javascript
console.log(["a"] + ["b"]); // "ab"
console.log([] + []); // ""
console.log(![] + []); // "false", because ![] returns false.
```
**[⬆ Back to Top](#table-of-contents)**
358. ### What is the output of prepend additive operator on falsy values
If you prepend the additive(+) operator on falsy values(null, undefined, NaN, false, ""), the falsy value converts to a number value zero. Let's display them on browser console as below,
```javascript
console.log(+null); // 0
console.log(+undefined); // NaN
console.log(+false); // 0
console.log(+NaN); // NaN
console.log(+""); // 0
```
**[⬆ Back to Top](#table-of-contents)**
359. ### How do you create self string using special characters
The self string can be formed with the combination of `[]()!+` characters. You need to remember the below conventions to achieve this pattern.
1. Since Arrays are truthful values, negating the arrays will produce false: ![] === false
2. As per JavaScript coercion rules, the addition of arrays together will toString them: [] + [] === ""
3. Prepend an array with + operator will convert an array to false, the negation will make it true and finally converting the result will produce value '1': +(!(+[])) === 1
By applying the above rules, we can derive below conditions
```javascript
(![] + [] === "false" + !+[]) === 1;
```
Now the character pattern would be created as below,
```javascript
s e l f
^^^^^^^^^^^^^ ^^^^^^^^^^^^^ ^^^^^^^^^^^^^ ^^^^^^^^^^^^^
(![] + [])[3] + (![] + [])[4] + (![] + [])[2] + (![] + [])[0]
^^^^^^^^^^^^^ ^^^^^^^^^^^^^ ^^^^^^^^^^^^^ ^^^^^^^^^^^^^
(![] + [])[+!+[]+!+[]+!+[]] +
(![] + [])[+!+[]+!+[]+!+[]+!+[]] +
(![] + [])[+!+[]+!+[]] +
(![] + [])[+[]]
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
(![]+[])[+!+[]+!+[]+!+[]]+(![]+[])[+!+[]+!+[]+!+[]+!+[]]+(![]+[])[+!+[]+!+[]]+(![]+[])[+[]]
```
**[⬆ Back to Top](#table-of-contents)**
360. ### How do you remove falsy values from an array
You can apply the filter method on the array by passing Boolean as a parameter. This way it removes all falsy values(0, undefined, null, false and "") from the array.
```javascript
const myArray = [false, null, 1, 5, undefined];
myArray.filter(Boolean); // [1, 5] // is same as myArray.filter(x => x);
```
**[⬆ Back to Top](#table-of-contents)**
361. ### How do you get unique values of an array
You can get unique values of an array with the combination of `Set` and rest expression/spread(...) syntax.
```javascript
console.log([...new Set([1, 2, 4, 4, 3])]); // [1, 2, 4, 3]
```
**[⬆ Back to Top](#table-of-contents)**
362. ### What is destructuring aliases
Sometimes you would like to have a destructured variable with a different name than the property name. In that case, you'll use a `: newName` to specify a name for the variable. This process is called destructuring aliases.
```javascript
const obj = { x: 1 };
// Grabs obj.x as as { otherName }
const { x: otherName } = obj;
```
**[⬆ Back to Top](#table-of-contents)**
363. ### How do you map the array values without using map method
You can map the array values without using the `map` method by just using the `from` method of Array. Let's map city names from Countries array,
```javascript
const countries = [
{ name: "India", capital: "Delhi" },
{ name: "US", capital: "Washington" },
{ name: "Russia", capital: "Moscow" },
{ name: "Singapore", capital: "Singapore" },
{ name: "China", capital: "Beijing" },
{ name: "France", capital: "Paris" },
];
const cityNames = Array.from(countries, ({ capital }) => capital);
console.log(cityNames); // ['Delhi, 'Washington', 'Moscow', 'Singapore', 'Beijing', 'Paris']
```
**[⬆ Back to Top](#table-of-contents)**
364. ### How do you empty an array
You can empty an array quickly by setting the array length to zero.
```javascript
let cities = ["Singapore", "Delhi", "London"];
cities.length = 0; // cities becomes []
```
**[⬆ Back to Top](#table-of-contents)**
365. ### How do you rounding numbers to certain decimals
You can round numbers to a certain number of decimals using `toFixed` method from native javascript.
```javascript
let pie = 3.141592653;
pie = pie.toFixed(3); // 3.142
```
**[⬆ Back to Top](#table-of-contents)**
366. ### What is the easiest way to convert an array to an object
You can convert an array to an object with the same data using spread(...) operator.
```javascript
var fruits = ["banana", "apple", "orange", "watermelon"];
var fruitsObject = { ...fruits };
console.log(fruitsObject); // {0: "banana", 1: "apple", 2: "orange", 3: "watermelon"}
```
**[⬆ Back to Top](#table-of-contents)**
367. ### How do you create an array with some data
You can create an array with some data or an array with the same values using `fill` method.
```javascript
var newArray = new Array(5).fill("0");
console.log(newArray); // ["0", "0", "0", "0", "0"]
```
**[⬆ Back to Top](#table-of-contents)**
368. ### What are the placeholders from console object
Below are the list of placeholders available from console object,
1. %o — It takes an object,
2. %s — It takes a string,
3. %d — It is used for a decimal or integer
These placeholders can be represented in the console.log as below
```javascript
const user = { name: "John", id: 1, city: "Delhi" };
console.log(
"Hello %s, your details %o are available in the object form",
"John",
user
); // Hello John, your details {name: "John", id: 1, city: "Delhi"} are available in object
```
**[⬆ Back to Top](#table-of-contents)**
369. ### Is it possible to add CSS to console messages
Yes, you can apply CSS styles to console messages similar to html text on the web page.
```javascript
console.log(
"%c The text has blue color, with large font and red background",
"color: blue; font-size: x-large; background: red"
);
```
The text will be displayed as below,
**Note:** All CSS styles can be applied to console messages.
**[⬆ Back to Top](#table-of-contents)**
370. ### What is the purpose of dir method of console object
The `console.dir()` is used to display an interactive list of the properties of the specified JavaScript object as JSON.
```javascript
const user = { name: "John", id: 1, city: "Delhi" };
console.dir(user);
```
The user object displayed in JSON representation
**[⬆ Back to Top](#table-of-contents)**
371. ### Is it possible to debug HTML elements in console
Yes, it is possible to get and debug HTML elements in the console just like inspecting elements.
```javascript
const element = document.getElementsByTagName("body")[0];
console.log(element);
```
It prints the HTML element in the console,
**[⬆ Back to Top](#table-of-contents)**
372. ### How do you display data in a tabular format using console object
The `console.table()` is used to display data in the console in a tabular format to visualize complex arrays or objects.
```js
const users = [
{ name: "John", id: 1, city: "Delhi" },
{ name: "Max", id: 2, city: "London" },
{ name: "Rod", id: 3, city: "Paris" },
];
console.table(users);
```
The data visualized in a table format,
**Not:** Remember that `console.table()` is not supported in IE.
**[⬆ Back to Top](#table-of-contents)**
373. ### How do you verify that an argument is a Number or not
The combination of IsNaN and isFinite methods are used to confirm whether an argument is a number or not.
```javascript
function isNumber(n) {
return !isNaN(parseFloat(n)) && isFinite(n);
}
```
**[⬆ Back to Top](#table-of-contents)**
374. ### How do you create copy to clipboard button
You need to select the content(using .select() method) of the input element and execute the copy command with execCommand (i.e, execCommand('copy')). You can also execute other system commands like cut and paste.
```javascript
document.querySelector("#copy-button").onclick = function () {
// Select the content
document.querySelector("#copy-input").select();
// Copy to the clipboard
document.execCommand("copy");
};
```
**[⬆ Back to Top](#table-of-contents)**
375. ### What is the shortcut to get timestamp
You can use `new Date().getTime()` to get the current timestamp. There is an alternative shortcut to get the value.
```javascript
console.log(+new Date());
console.log(Date.now());
```
**[⬆ Back to Top](#table-of-contents)**
376. ### How do you flattening multi dimensional arrays
Flattening bi-dimensional arrays is trivial with Spread operator.
```javascript
const biDimensionalArr = [11, [22, 33], [44, 55], [66, 77], 88, 99];
const flattenArr = [].concat(...biDimensionalArr); // [11, 22, 33, 44, 55, 66, 77, 88, 99]
```
But you can make it work with multi-dimensional arrays by recursive calls,
```javascript
function flattenMultiArray(arr) {
const flattened = [].concat(...arr);
return flattened.some((item) => Array.isArray(item))
? flattenMultiArray(flattened)
: flattened;
}
const multiDimensionalArr = [11, [22, 33], [44, [55, 66, [77, [88]], 99]]];
const flatArr = flattenMultiArray(multiDimensionalArr); // [11, 22, 33, 44, 55, 66, 77, 88, 99]
```
Also you can use the `flat` method of Array.
```javascript
const arr = [1, [2, 3], 4, 5, [6, 7]];
const fllattenArr = arr.flat(); // [1, 2, 3, 4, 5, 6, 7]
// And for multiDemensional arrays
const multiDimensionalArr = [11, [22, 33], [44, [55, 66, [77, [88]], 99]]];
const oneStepFlat = multiDimensionalArr.flat(1); // [11, 22, 33, 44, [55, 66, [77, [88]], 99]]
const towStep = multiDimensionalArr.flat(2); // [11, 22, 33, 44, 55, 66, [77, [88]], 99]
const fullyFlatArray = multiDimensionalArr.flat(Infinity); // [11, 22, 33, 44, 55, 66, 77, 88, 99]
```
**[⬆ Back to Top](#table-of-contents)**
377. ### What is the easiest multi condition checking
You can use `indexOf` to compare input with multiple values instead of checking each value as one condition.
```javascript
// Verbose approach
if (
input === "first" ||
input === 1 ||
input === "second" ||
input === 2
) {
someFunction();
}
// Shortcut
if (["first", 1, "second", 2].indexOf(input) !== -1) {
someFunction();
}
```
**[⬆ Back to Top](#table-of-contents)**
378. ### How do you capture browser back button
The `beforeunload` event is triggered when the window, the document and its resources are about to be unloaded. This event is helpful to warn users about losing the current data and detect back button event.
```javascript
window.addEventListener('beforeunload', () => {
console.log('Clicked browser back button');
});
```
You can also use `popstate` event to detect the browser back button.
**Note:** The history entry has been activated using `history.pushState` method.
```javascript
window.addEventListener('popstate', () => {
console.log('Clicked browser back button');
box.style.backgroundColor = 'white';
});
const box = document.getElementById('div');
box.addEventListener('click', () => {
box.style.backgroundColor = 'blue';
window.history.pushState({}, null, null);
});
```
In the preceeding code, When the box element clicked, its background color appears in blue color and changed to while color upon clicking the browser back button using `popstate` event handler. The `state` property of `popstate` contains the copy of history entry's state object.
**[⬆ Back to Top](#table-of-contents)**
379. ### How do you disable right click in the web page
The right click on the page can be disabled by returning false from the `oncontextmenu` attribute on the body element.
```html
<body oncontextmenu="return false;"></body>
```
**[⬆ Back to Top](#table-of-contents)**
380. ### What are wrapper objects
Primitive Values like string,number and boolean don't have properties and methods but they are temporarily converted or coerced to an object(Wrapper object) when you try to perform actions on them. For example, if you apply toUpperCase() method on a primitive string value, it does not throw an error but returns uppercase of the string.
```javascript
let name = "john";
console.log(name.toUpperCase()); // Behind the scenes treated as console.log(new String(name).toUpperCase());
```
i.e, Every primitive except null and undefined have Wrapper Objects and the list of wrapper objects are String,Number,Boolean,Symbol and BigInt.
**[⬆ Back to Top](#table-of-contents)**
381. ### What is AJAX
AJAX stands for Asynchronous JavaScript and XML and it is a group of related technologies(HTML, CSS, JavaScript, XMLHttpRequest API etc) used to display data asynchronously. i.e. We can send data to the server and get data from the server without reloading the web page.
**[⬆ Back to Top](#table-of-contents)**
382. ### What are the different ways to deal with Asynchronous Code
Below are the list of different ways to deal with Asynchronous code.
1. Callbacks
2. Promises
3. Async/await
4. Third-party libraries such as async.js,bluebird etc
**[⬆ Back to Top](#table-of-contents)**
383. ### How to cancel a fetch request
Until a few days back, One shortcoming of native promises is no direct way to cancel a fetch request. But the new `AbortController` from js specification allows you to use a signal to abort one or multiple fetch calls.
The basic flow of cancelling a fetch request would be as below,
1. Create an `AbortController` instance
2. Get the signal property of an instance and pass the signal as a fetch option for signal
3. Call the AbortController's abort property to cancel all fetches that use that signal
For example, let's pass the same signal to multiple fetch calls will cancel all requests with that signal,
```javascript
const controller = new AbortController();
const { signal } = controller;
fetch("http://localhost:8000", { signal })
.then((response) => {
console.log(`Request 1 is complete!`);
})
.catch((e) => {
if (e.name === "AbortError") {
// We know it's been canceled!
}
});
fetch("http://localhost:8000", { signal })
.then((response) => {
console.log(`Request 2 is complete!`);
})
.catch((e) => {
if (e.name === "AbortError") {
// We know it's been canceled!
}
});
// Wait 2 seconds to abort both requests
setTimeout(() => controller.abort(), 2000);
```
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384. ### What is web speech API
Web speech API is used to enable modern browsers recognize and synthesize speech(i.e, voice data into web apps). This API has been introduced by W3C Community in the year 2012. It has two main parts,
1. **SpeechRecognition (Asynchronous Speech Recognition or Speech-to-Text):** It provides the ability to recognize voice context from an audio input and respond accordingly. This is accessed by the `SpeechRecognition` interface.
The below example shows on how to use this API to get text from speech,
```javascript
window.SpeechRecognition =
window.webkitSpeechRecognition || window.SpeechRecognition; // webkitSpeechRecognition for Chrome and SpeechRecognition for FF
const recognition = new window.SpeechRecognition();
recognition.onresult = (event) => {
// SpeechRecognitionEvent type
const speechToText = event.results[0][0].transcript;
console.log(speechToText);
};
recognition.start();
```
In this API, browser is going to ask you for permission to use your microphone
1. **SpeechSynthesis (Text-to-Speech):** It provides the ability to recognize voice context from an audio input and respond. This is accessed by the `SpeechSynthesis` interface.
For example, the below code is used to get voice/speech from text,
```javascript
if ("speechSynthesis" in window) {
var speech = new SpeechSynthesisUtterance("Hello World!");
speech.lang = "en-US";
window.speechSynthesis.speak(speech);
}
```
The above examples can be tested on chrome(33+) browser's developer console.
**Note:** This API is still a working draft and only available in Chrome and Firefox browsers(ofcourse Chrome only implemented the specification)
**[⬆ Back to Top](#table-of-contents)**
385. ### What is minimum timeout throttling
Both browser and NodeJS javascript environments throttles with a minimum delay that is greater than 0ms. That means even though setting a delay of 0ms will not happen instantaneously.
**Browsers:** They have a minimum delay of 4ms. This throttle occurs when successive calls are triggered due to callback nesting(certain depth) or after a certain number of successive intervals.
Note: The older browsers have a minimum delay of 10ms.
**Nodejs:** They have a minimum delay of 1ms. This throttle happens when the delay is larger than 2147483647 or less than 1.
The best example to explain this timeout throttling behavior is the order of below code snippet.
```javascript
function runMeFirst() {
console.log("My script is initialized");
}
setTimeout(runMeFirst, 0);
console.log("Script loaded");
```
and the output would be in
```cmd
Script loaded
My script is initialized
```
If you don't use `setTimeout`, the order of logs will be sequential.
```javascript
function runMeFirst() {
console.log("My script is initialized");
}
runMeFirst();
console.log("Script loaded");
```
and the output is,
```cmd
My script is initialized
Script loaded
```
**[⬆ Back to Top](#table-of-contents)**
386. ### How do you implement zero timeout in modern browsers
You can't use setTimeout(fn, 0) to execute the code immediately due to minimum delay of greater than 0ms. But you can use window.postMessage() to achieve this behavior.
**[⬆ Back to Top](#table-of-contents)**
387. ### What are tasks in event loop
A task is any javascript code/program which is scheduled to be run by the standard mechanisms such as initially starting to run a program, run an event callback, or an interval or timeout being fired. All these tasks are scheduled on a task queue.
Below are the list of use cases to add tasks to the task queue,
1. When a new javascript program is executed directly from console or running by the `<script>` element, the task will be added to the task queue.
2. When an event fires, the event callback added to task queue
3. When a setTimeout or setInterval is reached, the corresponding callback added to task queue
**[⬆ Back to Top](#table-of-contents)**
388. ### What is microtask
Microtask is the javascript code which needs to be executed immediately after the currently executing task/microtask is completed. They are kind of blocking in nature. i.e, The main thread will be blocked until the microtask queue is empty.
The main sources of microtasks are Promise.resolve, Promise.reject, MutationObservers, IntersectionObservers etc
**Note:** All of these microtasks are processed in the same turn of the event loop.
**[⬆ Back to Top](#table-of-contents)**
389. ### What are different event loops
In JavaScript, there are multiple event loops that can be used depending on the context of your application. The most common event loops are:
1. The Browser Event Loop
2. The Node.js Event Loop
- Browser Event Loop: The Browser Event Loop is used in client-side JavaScript applications and is responsible for handling events that occur within the browser environment, such as user interactions (clicks, keypresses, etc.), HTTP requests, and other asynchronous actions.
- The Node.js Event Loop is used in server-side JavaScript applications and is responsible for handling events that occur within the Node.js runtime environment, such as file I/O, network I/O, and other asynchronous actions.
**[⬆ Back to Top](#table-of-contents)**
390. ### What is the purpose of queueMicrotask
The `queueMicrotask` function is used to schedule a microtask, which is a function that will be executed asynchronously in the microtask queue. The purpose of `queueMicrotask` is to ensure that a function is executed after the current task has finished, but before the browser performs any rendering or handles user events.
Example:
```javascript
console.log("Start"); //1
queueMicrotask(() => {
console.log("Inside microtask"); // 3
});
console.log("End"); //2
```
By using queueMicrotask, you can ensure that certain tasks or callbacks are executed at the earliest opportunity during the JavaScript event loop, making it useful for performing work that needs to be done asynchronously but with higher priority than regular `setTimeout` or `setInterval` callbacks.
**[⬆ Back to Top](#table-of-contents)**
391. ### How do you use javascript libraries in typescript file
It is known that not all JavaScript libraries or frameworks have TypeScript declaration files. But if you still want to use libraries or frameworks in our TypeScript files without getting compilation errors, the only solution is `declare` keyword along with a variable declaration. For example, let's imagine you have a library called `customLibrary` that doesn’t have a TypeScript declaration and have a namespace called `customLibrary` in the global namespace. You can use this library in typescript code as below,
```javascript
declare var customLibrary;
```
In the runtime, typescript will provide the type to the `customLibrary` variable as `any` type. The another alternative without using declare keyword is below
```javascript
var customLibrary: any;
```
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392. ### What are the differences between promises and observables
Some of the major difference in a tabular form
| Promises | Observables |
| ------------------------------------------------------------------ | ---------------------------------------------------------------------------------------- |
| Emits only a single value at a time | Emits multiple values over a period of time(stream of values ranging from 0 to multiple) |
| Eager in nature; they are going to be called immediately | Lazy in nature; they require subscription to be invoked |
| Promise is always asynchronous even though it resolved immediately | Observable can be either synchronous or asynchronous |
| Doesn't provide any operators | Provides operators such as map, forEach, filter, reduce, retry, and retryWhen etc |
| Cannot be canceled | Canceled by using unsubscribe() method |
**[⬆ Back to Top](#table-of-contents)**
393. ### What is heap
Heap(Or memory heap) is the memory location where objects are stored when we define variables. i.e, This is the place where all the memory allocations and de-allocation take place. Both heap and call-stack are two containers of JS runtime.
Whenever runtime comes across variables and function declarations in the code it stores them in the Heap.
**[⬆ Back to Top](#table-of-contents)**
394. ### What is an event table
Event Table is a data structure that stores and keeps track of all the events which will be executed asynchronously like after some time interval or after the resolution of some API requests. i.e Whenever you call a setTimeout function or invoke async operation, it is added to the Event Table.
It doesn't not execute functions on it’s own. The main purpose of the event table is to keep track of events and send them to the Event Queue as shown in the below diagram.
**[⬆ Back to Top](#table-of-contents)**
395. ### What is a microTask queue
Microtask Queue is the new queue where all the tasks initiated by promise objects get processed before the callback queue.
The microtasks queue are processed before the next rendering and painting jobs. But if these microtasks are running for a long time then it leads to visual degradation.
**[⬆ Back to Top](#table-of-contents)**
396. ### What is the difference between shim and polyfill
A shim is a library that brings a new API to an older environment, using only the means of that environment. It isn't necessarily restricted to a web application. For example, es5-shim.js is used to emulate ES5 features on older browsers (mainly pre IE9).
Whereas polyfill is a piece of code (or plugin) that provides the technology that you, the developer, expect the browser to provide natively.
In a simple sentence, A polyfill is a shim for a browser API.
**[⬆ Back to Top](#table-of-contents)**
397. ### How do you detect primitive or non primitive value type
In JavaScript, primitive types include boolean, string, number, BigInt, null, Symbol and undefined. Whereas non-primitive types include the Objects. But you can easily identify them with the below function,
```javascript
var myPrimitive = 30;
var myNonPrimitive = {};
function isPrimitive(val) {
return Object(val) !== val;
}
isPrimitive(myPrimitive);
isPrimitive(myNonPrimitive);
```
If the value is a primitive data type, the Object constructor creates a new wrapper object for the value. But If the value is a non-primitive data type (an object), the Object constructor will give the same object.
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398. ### What is babel
Babel is a JavaScript transpiler to convert ECMAScript 2015+ code into a backwards compatible version of JavaScript in current and older browsers or environments. Some of the main features are listed below,
1. Transform syntax
2. Polyfill features that are missing in your target environment (using @babel/polyfill)
3. Source code transformations (or codemods)
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399. ### Is Node.js completely single threaded
Node is a single thread, but some of the functions included in the Node.js standard library(e.g, fs module functions) are not single threaded. i.e, Their logic runs outside of the Node.js single thread to improve the speed and performance of a program.
**[⬆ Back to Top](#table-of-contents)**
400. ### What are the common use cases of observables
Some of the most common use cases of observables are web sockets with push notifications, user input changes, repeating intervals, etc
**[⬆ Back to Top](#table-of-contents)**
401. ### What is RxJS
RxJS (Reactive Extensions for JavaScript) is a library for implementing reactive programming using observables that makes it easier to compose asynchronous or callback-based code. It also provides utility functions for creating and working with observables.
**[⬆ Back to Top](#table-of-contents)**
402. ### What is the difference between Function constructor and function declaration
The functions which are created with `Function constructor` do not create closures to their creation contexts but they are always created in the global scope. i.e, the function can access its own local variables and global scope variables only. Whereas function declarations can access outer function variables(closures) too.
Let's see this difference with an example,
**Function Constructor:**
```javascript
var a = 100;
function createFunction() {
var a = 200;
return new Function("return a;");
}
console.log(createFunction()()); // 100
```
**Function declaration:**
```javascript
var a = 100;
function createFunction() {
var a = 200;
return function func() {
return a;
};
}
console.log(createFunction()()); // 200
```
**[⬆ Back to Top](#table-of-contents)**
403. ### What is a Short circuit condition
Short circuit conditions are meant for condensed way of writing simple if statements. Let's demonstrate the scenario using an example. If you would like to login to a portal with an authentication condition, the expression would be as below,
```javascript
if (authenticate) {
loginToPorta();
}
```
Since the javascript logical operators evaluated from left to right, the above expression can be simplified using && logical operator
```javascript
authenticate && loginToPorta();
```
**[⬆ Back to Top](#table-of-contents)**
404. ### What is the easiest way to resize an array
The length property of an array is useful to resize or empty an array quickly. Let's apply length property on number array to resize the number of elements from 5 to 2,
```javascript
var array = [1, 2, 3, 4, 5];
console.log(array.length); // 5
array.length = 2;
console.log(array.length); // 2
console.log(array); // [1,2]
```
and the array can be emptied too
```javascript
var array = [1, 2, 3, 4, 5];
array.length = 0;
console.log(array.length); // 0
console.log(array); // []
```
**[⬆ Back to Top](#table-of-contents)**
405. ### What is an observable
An Observable is basically a function that can return a stream of values either synchronously or asynchronously to an observer over time. The consumer can get the value by calling `subscribe()` method.
Let's look at a simple example of an Observable
```javascript
import { Observable } from "rxjs";
const observable = new Observable((observer) => {
setTimeout(() => {
observer.next("Message from a Observable!");
}, 3000);
});
observable.subscribe((value) => console.log(value));
```
**Note:** Observables are not part of the JavaScript language yet but they are being proposed to be added to the language
**[⬆ Back to Top](#table-of-contents)**
406. ### What is the difference between function and class declarations
The main difference between function declarations and class declarations is `hoisting`. The function declarations are hoisted but not class declarations.
**Classes:**
```javascript
const user = new User(); // ReferenceError
class User {}
```
**Constructor Function:**
```javascript
const user = new User(); // No error
function User() {}
```
**[⬆ Back to Top](#table-of-contents)**
407. ### What is an async function
An async function is a function declared with the `async` keyword which enables asynchronous, promise-based behavior to be written in a cleaner style by avoiding promise chains. These functions can contain zero or more `await` expressions.
Let's take a below async function example,
```javascript
async function logger() {
let data = await fetch("http://someapi.com/users"); // pause until fetch returns
console.log(data);
}
logger();
```
It is basically syntax sugar over ES2015 promises and generators.
**[⬆ Back to Top](#table-of-contents)**
408. ### How do you prevent promises swallowing errors
While using asynchronous code, JavaScript’s ES6 promises can make your life a lot easier without having callback pyramids and error handling on every second line. But Promises have some pitfalls and the biggest one is swallowing errors by default.
Let's say you expect to print an error to the console for all the below cases,
```javascript
Promise.resolve("promised value").then(function () {
throw new Error("error");
});
Promise.reject("error value").catch(function () {
throw new Error("error");
});
new Promise(function (resolve, reject) {
throw new Error("error");
});
```
But there are many modern JavaScript environments that won't print any errors. You can fix this problem in different ways,
1. **Add catch block at the end of each chain:** You can add catch block to the end of each of your promise chains
```javascript
Promise.resolve("promised value")
.then(function () {
throw new Error("error");
})
.catch(function (error) {
console.error(error.stack);
});
```
But it is quite difficult to type for each promise chain and verbose too.
2. **Add done method:** You can replace first solution's then and catch blocks with done method
```javascript
Promise.resolve("promised value").done(function () {
throw new Error("error");
});
```
Let's say you want to fetch data using HTTP and later perform processing on the resulting data asynchronously. You can write `done` block as below,
```javascript
getDataFromHttp()
.then(function (result) {
return processDataAsync(result);
})
.done(function (processed) {
displayData(processed);
});
```
In future, if the processing library API changed to synchronous then you can remove `done` block as below,
```javascript
getDataFromHttp().then(function (result) {
return displayData(processDataAsync(result));
});
```
and then you forgot to add `done` block to `then` block leads to silent errors.
3. **Extend ES6 Promises by Bluebird:**
Bluebird extends the ES6 Promises API to avoid the issue in the second solution. This library has a “default” onRejection handler which will print all errors from rejected Promises to stderr. After installation, you can process unhandled rejections
```javascript
Promise.onPossiblyUnhandledRejection(function (error) {
throw error;
});
```
and discard a rejection, just handle it with an empty catch
```javascript
Promise.reject("error value").catch(function () {});
```
**[⬆ Back to Top](#table-of-contents)**
409. ### What is deno
Deno is a simple, modern and secure runtime for JavaScript and TypeScript that uses V8 JavaScript engine and the Rust programming language.
**[⬆ Back to Top](#table-of-contents)**
410. ### How do you make an object iterable in javascript
By default, plain objects are not iterable. But you can make the object iterable by defining a `Symbol.iterator` property on it.
Let's demonstrate this with an example,
```javascript
const collection = {
one: 1,
two: 2,
three: 3,
[Symbol.iterator]() {
const values = Object.keys(this);
let i = 0;
return {
next: () => {
return {
value: this[values[i++]],
done: i > values.length,
};
},
};
},
};
const iterator = collection[Symbol.iterator]();
console.log(iterator.next()); // → {value: 1, done: false}
console.log(iterator.next()); // → {value: 2, done: false}
console.log(iterator.next()); // → {value: 3, done: false}
console.log(iterator.next()); // → {value: undefined, done: true}
```
The above process can be simplified using a generator function,
```javascript
const collection = {
one: 1,
two: 2,
three: 3,
[Symbol.iterator]: function* () {
for (let key in this) {
yield this[key];
}
},
};
const iterator = collection[Symbol.iterator]();
console.log(iterator.next()); // {value: 1, done: false}
console.log(iterator.next()); // {value: 2, done: false}
console.log(iterator.next()); // {value: 3, done: false}
console.log(iterator.next()); // {value: undefined, done: true}
```
**[⬆ Back to Top](#table-of-contents)**
411. ### What is a Proper Tail Call
First, we should know about tail call before talking about "Proper Tail Call". A tail call is a subroutine or function call performed as the final action of a calling function. Whereas **Proper tail call(PTC)** is a technique where the program or code will not create additional stack frames for a recursion when the function call is a tail call.
For example, the below classic or head recursion of factorial function relies on stack for each step. Each step need to be processed upto `n * factorial(n - 1)`
```javascript
function factorial(n) {
if (n === 0) {
return 1;
}
return n * factorial(n - 1);
}
console.log(factorial(5)); //120
```
But if you use Tail recursion functions, they keep passing all the necessary data it needs down the recursion without relying on the stack.
```javascript
function factorial(n, acc = 1) {
if (n === 0) {
return acc;
}
return factorial(n - 1, n * acc);
}
console.log(factorial(5)); //120
```
The above pattern returns the same output as the first one. But the accumulator keeps track of total as an argument without using stack memory on recursive calls.
**[⬆ Back to Top](#table-of-contents)**
412. ### How do you check an object is a promise or not
If you don't know if a value is a promise or not, wrapping the value as `Promise.resolve(value)` which returns a promise
```javascript
function isPromise(object) {
if (Promise && Promise.resolve) {
return Promise.resolve(object) == object;
} else {
throw "Promise not supported in your environment";
}
}
var i = 1;
var promise = new Promise(function (resolve, reject) {
resolve();
});
console.log(isPromise(i)); // false
console.log(isPromise(promise)); // true
```
Another way is to check for `.then()` handler type
```javascript
function isPromise(value) {
return Boolean(value && typeof value.then === "function");
}
var i = 1;
var promise = new Promise(function (resolve, reject) {
resolve();
});
console.log(isPromise(i)); // false
console.log(isPromise(promise)); // true
```
**[⬆ Back to Top](#table-of-contents)**
413. ### How to detect if a function is called as constructor
You can use `new.target` pseudo-property to detect whether a function was called as a constructor(using the new operator) or as a regular function call.
1. If a constructor or function invoked using the new operator, new.target returns a reference to the constructor or function.
2. For function calls, new.target is undefined.
```javascript
function Myfunc() {
if (new.target) {
console.log("called with new");
} else {
console.log("not called with new");
}
}
new Myfunc(); // called with new
Myfunc(); // not called with new
Myfunc.call({}); // not called with new
```
**[⬆ Back to Top](#table-of-contents)**
414. ### What are the differences between arguments object and rest parameter
There are three main differences between arguments object and rest parameters
1. The arguments object is an array-like but not an array. Whereas the rest parameters are array instances.
2. The arguments object does not support methods such as sort, map, forEach, or pop. Whereas these methods can be used in rest parameters.
3. The rest parameters are only the ones that haven’t been given a separate name, while the arguments object contains all arguments passed to the function
**[⬆ Back to Top](#table-of-contents)**
415. ### What are the differences between spread operator and rest parameter
Rest parameter collects all remaining elements into an array. Whereas Spread operator allows iterables( arrays / objects / strings ) to be expanded into single arguments/elements. i.e, Rest parameter is opposite to the spread operator.
**[⬆ Back to Top](#table-of-contents)**
416. ### What are the different kinds of generators
There are five kinds of generators,
1. **Generator function declaration:**
```javascript
function* myGenFunc() {
yield 1;
yield 2;
yield 3;
}
const genObj = myGenFunc();
```
2. **Generator function expressions:**
```javascript
const myGenFunc = function* () {
yield 1;
yield 2;
yield 3;
};
const genObj = myGenFunc();
```
3. **Generator method definitions in object literals:**
```javascript
const myObj = {
*myGeneratorMethod() {
yield 1;
yield 2;
yield 3;
},
};
const genObj = myObj.myGeneratorMethod();
```
4. **Generator method definitions in class:**
```javascript
class MyClass {
*myGeneratorMethod() {
yield 1;
yield 2;
yield 3;
}
}
const myObject = new MyClass();
const genObj = myObject.myGeneratorMethod();
```
5. **Generator as a computed property:**
```javascript
const SomeObj = {
*[Symbol.iterator]() {
yield 1;
yield 2;
yield 3;
},
};
console.log(Array.from(SomeObj)); // [ 1, 2, 3 ]
```
**[⬆ Back to Top](#table-of-contents)**
417. ### What are the built-in iterables
Below are the list of built-in iterables in javascript,
1. Arrays and TypedArrays
2. Strings: Iterate over each character or Unicode code-points
3. Maps: iterate over its key-value pairs
4. Sets: iterates over their elements
5. arguments: An array-like special variable in functions
6. DOM collection such as NodeList
**[⬆ Back to Top](#table-of-contents)**
418. ### What are the differences between for...of and for...in statements
Both for...in and for...of statements iterate over js data structures. The only difference is over what they iterate:
1. for..in iterates over all enumerable property keys of an object
2. for..of iterates over the values of an iterable object.
Let's explain this difference with an example,
```javascript
let arr = ["a", "b", "c"];
arr.newProp = "newVlue";
// key are the property keys
for (let key in arr) {
console.log(key); // 0, 1, 2 & newValue
}
// value are the property values
for (let value of arr) {
console.log(value); // a, b, c
}
```
Since for..in loop iterates over the keys of the object, the first loop logs 0, 1, 2 and newProp while iterating over the array object. The for..of loop iterates over the values of a arr data structure and logs a, b, c in the console.
**[⬆ Back to Top](#table-of-contents)**
419. ### How do you define instance and non-instance properties
The Instance properties must be defined inside of class methods. For example, name and age properties defined inside constructor as below,
```javascript
class Person {
constructor(name, age) {
this.name = name;
this.age = age;
}
}
```
But Static(class) and prototype data properties must be defined outside of the ClassBody declaration. Let's assign the age value for Person class as below,
```javascript
Person.staticAge = 30;
Person.prototype.prototypeAge = 40;
```
**[⬆ Back to Top](#table-of-contents)**
420. ### What is the difference between isNaN and Number.isNaN?
1. **isNaN**: The global function `isNaN` converts the argument to a Number and returns true if the resulting value is NaN.
2. **Number.isNaN**: This method does not convert the argument. But it returns true when the type is a Number and value is NaN.
Let's see the difference with an example,
```javascript
isNaN(‘hello’); // true
Number.isNaN('hello'); // false
```
**[⬆ Back to Top](#table-of-contents)**
421. ### How to invoke an IIFE without any extra brackets?
Immediately Invoked Function Expressions(IIFE) requires a pair of parenthesis to wrap the function which contains set of statements.
```js
(function (dt) {
console.log(dt.toLocaleTimeString());
})(new Date());
```
Since both IIFE and void operator discard the result of an expression, you can avoid the extra brackets using `void operator` for IIFE as below,
```js
void (function (dt) {
console.log(dt.toLocaleTimeString());
})(new Date());
```
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422. ### Is that possible to use expressions in switch cases?
You might have seen expressions used in switch condition but it is also possible to use for switch cases by assigning true value for the switch condition. Let's see the weather condition based on temparature as an example,
```js
const weather = (function getWeather(temp) {
switch (true) {
case temp < 0:
return "freezing";
case temp < 10:
return "cold";
case temp < 24:
return "cool";
default:
return "unknown";
}
})(10);
```
**[⬆ Back to Top](#table-of-contents)**
423. ### What is the easiest way to ignore promise errors?
The easiest and safest way to ignore promise errors is void that error. This approach is ESLint friendly too.
```js
await promise.catch((e) => void e);
```
**[⬆ Back to Top](#table-of-contents)**
424. ### How do style the console output using CSS?
You can add CSS styling to the console output using the CSS format content specifier %c. The console string message can be appended after the specifier and CSS style in another argument. Let's print the red the color text using console.log and CSS specifier as below,
```js
console.log("%cThis is a red text", "color:red");
```
It is also possible to add more styles for the content. For example, the font-size can be modified for the above text
```js
console.log(
"%cThis is a red text with bigger font",
"color:red; font-size:20px"
);
```
**[⬆ Back to Top](#table-of-contents)**
425. ### What is nullish coalescing operator (??)?
It is a logical operator that returns its right-hand side operand when its left-hand side operand is null or undefined, and otherwise returns its left-hand side operand. This can be contrasted with the logical OR (||) operator, which returns the right-hand side operand if the left operand is any falsy value, not only null or undefined.
```js
console.log(null ?? true); // true
console.log(false ?? true); // false
console.log(undefined ?? true); // true
```
**[⬆ Back to Top](#table-of-contents)**
426. ### How do you group and nest console output?
The `console.group()` can be used to group related log messages to be able to easily read the logs and use console.groupEnd()to close the group. Along with this, you can also nest groups which allows to output message in hierarchical manner.
For example, if you’re logging a user’s details:
```js
console.group("User Details");
console.log("name: Sudheer Jonna");
console.log("job: Software Developer");
// Nested Group
console.group("Address");
console.log("Street: Commonwealth");
console.log("City: Los Angeles");
console.log("State: California");
// Close nested group
console.groupEnd();
// Close outer group
console.groupEnd();
```
You can also use `console.groupCollapsed()` instead of `console.group()` if you want the groups to be collapsed by default.
**[⬆ Back to Top](#table-of-contents)**
427. ### What is the difference between dense and sparse arrays?
An array contains items at each index starting from first(0) to last(array.length - 1) is called as Dense array. Whereas if at least one item is missing at any index, the array is called as sparse.
Let's see the below two kind of arrays,
```js
const avengers = ["Ironman", "Hulk", "CaptainAmerica"];
console.log(avengers[0]); // 'Ironman'
console.log(avengers[1]); // 'Hulk'
console.log(avengers[2]); // 'CaptainAmerica'
console.log(avengers.length); // 3
const justiceLeague = ["Superman", "Aquaman", , "Batman"];
console.log(justiceLeague[0]); // 'Superman'
console.log(justiceLeague[1]); // 'Aquaman'
console.log(justiceLeague[2]); // undefined
console.log(justiceLeague[3]); // 'Batman'
console.log(justiceLeague.length); // 4
```
**[⬆ Back to Top](#table-of-contents)**
428. ### What are the different ways to create sparse arrays?
There are 4 different ways to create sparse arrays in JavaScript
1. **Array literal:** Omit a value when using the array literal
```js
const justiceLeague = ["Superman", "Aquaman", , "Batman"];
console.log(justiceLeague); // ['Superman', 'Aquaman', empty ,'Batman']
```
2. **Array() constructor:** Invoking Array(length) or new Array(length)
```js
const array = Array(3);
console.log(array); // [empty, empty ,empty]
```
3. **Delete operator:** Using delete array[index] operator on the array
```js
const justiceLeague = ["Superman", "Aquaman", "Batman"];
delete justiceLeague[1];
console.log(justiceLeague); // ['Superman', empty, ,'Batman']
```
4. **Increase length property:** Increasing length property of an array
```js
const justiceLeague = ["Superman", "Aquaman", "Batman"];
justiceLeague.length = 5;
console.log(justiceLeague); // ['Superman', 'Aquaman', 'Batman', empty, empty]
```
**[⬆ Back to Top](#table-of-contents)**
429. ### What is the difference between setTimeout, setImmediate and process.nextTick?
1. **Set Timeout:** setTimeout() is to schedule execution of a one-time callback after delay milliseconds.
2. **Set Immediate:** The setImmediate function is used to execute a function right after the current event loop finishes.
3. **Process NextTick:** If process.nextTick() is called in a given phase, all the callbacks passed to process.nextTick() will be resolved before the event loop continues. This will block the event loop and create I/O Starvation if process.nextTick() is called recursively.
**[⬆ Back to Top](#table-of-contents)**
430. ### How do you reverse an array without modifying original array?
The `reverse()` method reverses the order of the elements in an array but it mutates the original array. Let's take a simple example to demonistrate this case,
```javascript
const originalArray = [1, 2, 3, 4, 5];
const newArray = originalArray.reverse();
console.log(newArray); // [ 5, 4, 3, 2, 1]
console.log(originalArray); // [ 5, 4, 3, 2, 1]
```
There are few solutions that won't mutate the original array. Let's take a look.
1. **Using slice and reverse methods:**
In this case, just invoke the `slice()` method on the array to create a shallow copy followed by `reverse()` method call on the copy.
```javascript
const originalArray = [1, 2, 3, 4, 5];
const newArray = originalArray.slice().reverse(); //Slice an array gives a new copy
console.log(originalArray); // [1, 2, 3, 4, 5]
console.log(newArray); // [ 5, 4, 3, 2, 1]
```
2. **Using spread and reverse methods:**
In this case, let's use the spread syntax (...) to create a copy of the array followed by `reverse()` method call on the copy.
```javascript
const originalArray = [1, 2, 3, 4, 5];
const newArray = [...originalArray].reverse();
console.log(originalArray); // [1, 2, 3, 4, 5]
console.log(newArray); // [ 5, 4, 3, 2, 1]
```
3. **Using reduce and spread methods:**
Here execute a reducer function on an array elements and append the accumulated array on right side using spread syntax
```javascript
const originalArray = [1, 2, 3, 4, 5];
const newArray = originalArray.reduce((accumulator, value) => {
return [value, ...accumulator];
}, []);
console.log(originalArray); // [1, 2, 3, 4, 5]
console.log(newArray); // [ 5, 4, 3, 2, 1]
```
4. **Using reduceRight and spread methods:**
Here execute a right reducer function(i.e. opposite direction of reduce method) on an array elements and append the accumulated array on left side using spread syntax
```javascript
const originalArray = [1, 2, 3, 4, 5];
const newArray = originalArray.reduceRight((accumulator, value) => {
return [...accumulator, value];
}, []);
console.log(originalArray); // [1, 2, 3, 4, 5]
console.log(newArray); // [ 5, 4, 3, 2, 1]
```
5. **Using reduceRight and push methods:**
Here execute a right reducer function(i.e. opposite direction of reduce method) on an array elements and push the iterated value to the accumulator
```javascript
const originalArray = [1, 2, 3, 4, 5];
const newArray = originalArray.reduceRight((accumulator, value) => {
accumulator.push(value);
return accumulator;
}, []);
console.log(originalArray); // [1, 2, 3, 4, 5]
console.log(newArray); // [ 5, 4, 3, 2, 1]
```
**[⬆ Back to Top](#table-of-contents)**
431. ### How do you create custom HTML element?
The creation of custom HTML elements involves two main steps,
1. **Define your custom HTML element:** First you need to define some custom class by extending HTMLElement class.
After that define your component properties (styles,text etc) using `connectedCallback` method.
**Note:** The browser exposes a function called `customElements.define` inorder to reuse the element.
```javascript
class CustomElement extends HTMLElement {
connectedCallback() {
this.innerHTML = "This is a custom element";
}
}
customElements.define("custom-element", CustomElement);
```
2. **Use custome element just like other HTML element:** Declare your custom element as a HTML tag.
```javascript
<body>
<custom-element>
</body>
```
**[⬆ Back to Top](#table-of-contents)**
432. ### What is global execution context?
The global execution context is the default or first execution context that is created by the JavaScript engine before any code is executed(i.e, when the file first loads in the browser). All the global code that is not inside a function or object will be executed inside this global execution context. Since JS engine is single threaded there will be only one global environment and there will be only one global execution context.
For example, the below code other than code inside any function or object is executed inside the global execution context.
```javascript
var x = 10;
function A() {
console.log("Start function A");
function B() {
console.log("In function B");
}
B();
}
A();
console.log("GlobalContext");
```
**[⬆ Back to Top](#table-of-contents)**
433. ### What is function execution context?
Whenever a function is invoked, the JavaScript engine creates a different type of Execution Context known as a Function Execution Context (FEC) within the Global Execution Context (GEC) to evaluate and execute the code within that function.
**[⬆ Back to Top](#table-of-contents)**
434. ### What is debouncing?
Debouncing is a programming pattern that allows delaying execution of some piece of code until a specified time to avoid unnecessary _CPU cycles, API calls and improve performance_. The debounce function make sure that your code is only triggered once per user input. The common usecases are Search box suggestions, text-field auto-saves, and eliminating double-button clicks.
Let's say you want to show suggestions for a search query, but only after a visitor has finished typing it. So here you write a debounce function where the user keeps writing the characters with in 500ms then previous timer cleared out using `clearTimeout` and reschedule API call/DB query for a new time—300 ms in the future.
```js
function debounce(func, timeout = 500) {
let timer;
return (...args) => {
clearTimeout(timer);
timer = setTimeout(() => {
func.apply(this, args);
}, timeout);
};
}
function fetchResults() {
console.log("Fetching input suggestions");
}
const processChange = debounce(() => fetchResults());
```
The _debounce()_ function can be used on input, button and window events
**Input:**
```html
<input type="text" onkeyup="processChange()" />
```
**Button:**
```html
<button onclick="processChange()">Click me</button>
```
**Windows event:**
```html
window.addEventListener("scroll", processChange);
```
**[⬆ Back to Top](#table-of-contents)**
435. ### What is throttling?
Throttling is a technique used to limit the execution of an event handler function, even when this event triggers continuously due to user actions. The common use cases are browser resizing, window scrolling etc.
The below example creates a throttle function to reduce the number of events for each pixel change and trigger scroll event for each 100ms except for the first event.
```js
const throttle = (func, limit) => {
let inThrottle;
return (...args) => {
if (!inThrottle) {
func.apply(this, args);
inThrottle = true;
setTimeout(() => (inThrottle = false), limit);
}
};
};
window.addEventListener("scroll", () => {
throttle(handleScrollAnimation, 100);
});
```
**[⬆ Back to Top](#table-of-contents)**
436. ### What is optional chaining?
According to MDN official docs, the optional chaining operator (?.) permits reading the value of a property located deep within a chain of connected objects without having to expressly validate that each reference in the chain is valid.
The ?. operator is like the . chaining operator, except that instead of causing an error if a reference is nullish (null or undefined), the expression short-circuits with a return value of undefined. When used with function calls, it returns undefined if the given function does not exist.
```js
const adventurer = {
name: "Alice",
cat: {
name: "Dinah",
},
};
const dogName = adventurer.dog?.name;
console.log(dogName);
// expected output: undefined
console.log(adventurer.someNonExistentMethod?.());
// expected output: undefined
```
**[⬆ Back to Top](#table-of-contents)**
437. ### What is an environment record?
According to ECMAScript specification 262 (9.1):
> [Environment Record](https://262.ecma-international.org/12.0/#sec-environment-records) is a specification type used to define the association of Identifiers to specific variables and functions, based upon the lexical nesting structure of ECMAScript code.
Usually an Environment Record is associated with some specific syntactic structure of ECMAScript code such as a FunctionDeclaration, a BlockStatement, or a Catch clause of a TryStatement.
Each time such code is evaluated, a new Environment Record is created to record the identifier bindings that are created by that code.
**[⬆ Back to Top](#table-of-contents)**
438. ### How to verify if a variable is an array?
It is possible to check if a variable is an array instance using 3 different ways,
1. Array.isArray() method:
The `Array.isArray(value)` utility function is used to determine whether value is an array or not. This function returns a true boolean value if the variable is an array and a false value if it is not.
```javascript
const numbers = [1, 2, 3];
const user = { name: "John" };
Array.isArray(numbers); // true
Array.isArray(user); //false
```
2. instanceof operator:
The instanceof operator is used to check the type of an array at run time. It returns true if the type of a variable is an Array other false for other type.
```javascript
const numbers = [1, 2, 3];
const user = { name: "John" };
console.log(numbers instanceof Array); // true
console.log(user instanceof Array); // false
```
3. Checking constructor type:
The constructor property of the variable is used to determine whether the variable Array type or not.
```javascript
const numbers = [1, 2, 3];
const user = { name: "John" };
console.log(numbers.constructor === Array); // true
console.log(user.constructor === Array); // false
```
**[⬆ Back to Top](#table-of-contents)**
439. ### What is pass by value and pass by reference?
Pass-by-value creates a new space in memory and makes a copy of a value. Primitives such as string, number, boolean etc will actually create a new copy. Hence, updating one value doesn't impact the other value. i.e, The values are independent of each other.
```javascript
let a = 5;
let b = a;
b++;
console.log(a, b); //5, 6
```
In the above code snippet, the value of `a` is assigned to `b` and the variable `b` has been incremented. Since there is a new space created for variable `b`, any update on this variable doesn't impact the variable `a`.
Pass by reference doesn't create a new space in memory but the new variable adopts a memory address of an initial variable. Non-primitives such as objects, arrays and functions gets the reference of the initiable variable. i.e, updating one value will impact the other variable.
```javascript
let user1 = {
name: "John",
age: 27,
};
let user2 = user1;
user2.age = 30;
console.log(user1.age, user2.age); // 30, 30
```
In the above code snippet, updating the `age` property of one object will impact the other property due to the same reference.
**[⬆ Back to Top](#table-of-contents)**
440. ### What are the differences between primitives and non-primitives?
JavaScript language has both primitives and non-primitives but there are few differences between them as below,
| Primitives | Non-primitives |
| -------------------------- | -------------------- |
| These types are predefined | Created by developer |
| These are immutable | Mutable |
| Compare by value | Compare by reference |
| Stored in Stack | Stored in heap |
| Contain certain value | Can contain NULL too |
**[⬆ Back to Top](#table-of-contents)**
441. ### How do you create your own bind method using either call or apply method?
The custom bind function needs to be created on Function prototype inorder to use it as other builtin functions. This custom function should return a function similar to original bind method and the implementation of inner function needs to use apply method call.
The function which is going to bind using custom `myOwnBind` method act as the attached function(`boundTargetFunction`) and argument as the object for `apply` method call.
```js
Function.prototype.myOwnBind = function (whoIsCallingMe) {
if (typeof this !== "function") {
throw new Error(this + "cannot be bound as it's not callable");
}
const boundTargetFunction = this;
return function () {
boundTargetFunction.apply(whoIsCallingMe, arguments);
};
};
```
**[⬆ Back to Top](#table-of-contents)**
442. ### What are the differences between pure and impure functions?
Some of the major differences between pure and impure function are as below,
| Pure function | Impure function |
| ----------------------------------- | --------------------------------------------------------------------- |
| It has no side effects | It causes side effects |
| It is always return the same result | It returns different result on each call |
| Easy to read and debug | Difficult to read and debug because they are affected by extenal code |
**[⬆ Back to Top](#table-of-contents)**
445. ### What is referential transparency?
An expression in javascript that can be replaced by its value without affecting the behaviour of the program is called referential transparency. Pure functions are referentially transparent.
```javascript
const add = (x, y) => x + y;
const multiplyBy2 = (x) => x * 2;
//Now add (2, 3) can be replaced by 5.
multiplyBy2(add(2, 3));
```
**[⬆ Back to Top](#table-of-contents)**
446. ### What are the possible side-effects in javascript?
A side effect is the modification of the state through the invocation of a function or expression. These side effects make our function impure by default. Below are some side effects which make function impure,
- Making an HTTP request. Asynchronous functions such as fetch and promise are impure.
- DOM manipulations
- Mutating the input data
- Printing to a screen or console: For example, console.log() and alert()
- Fetching the current time
- Math.random() calls: Modifies the internal state of Math object
**[⬆ Back to Top](#table-of-contents)**
447. ### What are compose and pipe functions?
The "compose" and "pipe" are two techniques commonly used in functional programming to simplify complex operations and make code more readable. They are not native to JavaScript and higher-order functions. the `compose()` applies right to left any number of functions to the output of the previous function.
**[⬆ Back to Top](#table-of-contents)**
448. ### What is module pattern?
Module pattern is a designed pattern used to wrap a set of variables and functions together in a single scope returned as an object. JavaScript doesn't have access specifiers similar to other languages(Java, Python, etc) to provide private scope. It uses IIFE (Immediately invoked function expression) to allow for private scopes. i.e., a closure that protect variables and methods.
The module pattern looks like below,
```javascript
(function () {
// Private variables or functions goes here.
return {
// Return public variables or functions here.
};
})();
```
Let's see an example of a module pattern for an employee with private and public access,
```javascript
const createEmployee = (function () {
// Private
const name = "John";
const department = "Sales";
const getEmployeeName = () => name;
const getDepartmentName = () => department;
// Public
return {
name,
department,
getName: () => getEmployeeName(),
getDepartment: () => getDepartmentName(),
};
})();
console.log(createEmployee.name);
console.log(createEmployee.department);
console.log(createEmployee.getName());
console.log(createEmployee.getDepartment());
```
**Note:** It mimic the concepts of classes with private variables and methods.
**[⬆ Back to Top](#table-of-contents)**
449. ### What is Function Composition?
It is an approach where the result of one function is passed on to the next function, which is passed to another until the final function is executed for the final result.
```javascript
//example
const double = (x) => x * 2;
const square = (x) => x * x;
var output1 = double(2);
var output2 = square(output1);
console.log(output2);
var output_final = square(double(2));
console.log(output_final);
```
**[⬆ Back to Top](#table-of-contents)**
450. ### How to use await outside of async function prior to ES2022?
Prior to ES2022, if you attempted to use an await outside of an async function resulted in a SyntaxError.
```javascript
await Promise.resolve(console.log("Hello await")); // SyntaxError: await is only valid in async function
```
But you can fix this issue with an alternative IIFE (Immediately Invoked Function Expression) to get access to the feature.
```javascript
(async function () {
await Promise.resolve(console.log("Hello await")); // Hello await
})();
```
In ES2022, you can write top-level await without writing any hacks.
```javascript
await Promise.resolve(console.log("Hello await")); //Hello await
```
**[⬆ Back to Top](#table-of-contents)**
451. ### What is the purpose of the this keyword in JavaScript?
* The `this` keyword in JavaScript is a special variable that is used within a function to refer to the object on which the function is invoked. The value of this depends on how the function is called. It allows functions to access and interact with the object they are bound to.
* The this keyword in JavaScript is a reference to the object that owns or invokes the current function. Its value is determined by the calling context.
**Example 1: this in a Global Context**
```javascript
console.log(this);
```
* In a global context, this refers to the global object (e.g., window in a browser).
**Example 2: this in a Function**
```javascript
function displayThis() {
console.log(this);
}
displayThis();
```
* In a regular function, this refers to the global object.
**Example 3: this in a Method**
```javascript
const person = {
name: 'John',
greet: function() {
console.log('Hello, ' + this.name);
}
};
person.greet();
```
* In a method, this refers to the object that owns the method (person in the case).
**Example 4: this in an Event Handler**
```javascript
document.getElementById('myButton').addEventListener('click', function() {
console.log(this);
});
```
* In an event handler, this refers to the element that triggered the event (the button in this case).
**[⬆ Back to Top](#table-of-contents)**
### Coding Exercise
#### 1. What is the output of below code
```javascript
var car = new Vehicle("Honda", "white", "2010", "UK");
console.log(car);
function Vehicle(model, color, year, country) {
this.model = model;
this.color = color;
this.year = year;
this.country = country;
}
```
- 1: Undefined
- 2: ReferenceError
- 3: null
- 4: {model: "Honda", color: "white", year: "2010", country: "UK"}
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 4
The function declarations are hoisted similar to any variables. So the placement for `Vehicle` function declaration doesn't make any difference.
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 2. What is the output of below code
```javascript
function foo() {
let x = (y = 0);
x++;
y++;
return x;
}
console.log(foo(), typeof x, typeof y);
```
- 1: 1, undefined and undefined
- 2: ReferenceError: X is not defined
- 3: 1, undefined and number
- 4: 1, number and number
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 3
Of course the return value of `foo()` is 1 due to the increment operator. But the statement `let x = y = 0` declares a local variable x. Whereas y declared as a global variable accidentally. This statement is equivalent to,
```javascript
let x;
window.y = 0;
x = window.y;
```
Since the block scoped variable x is undefined outside of the function, the type will be undefined too. Whereas the global variable `y` is available outside the function, the value is 0 and type is number.
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 3. What is the output of below code
```javascript
function main() {
console.log("A");
setTimeout(function print() {
console.log("B");
}, 0);
console.log("C");
}
main();
```
- 1: A, B and C
- 2: B, A and C
- 3: A and C
- 4: A, C and B
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 4
The statements order is based on the event loop mechanism. The order of statements follows the below order,
1. At first, the main function is pushed to the stack.
2. Then the browser pushes the first statement of the main function( i.e, A's console.log) to the stack, executing and popping out immediately.
3. But `setTimeout` statement moved to Browser API to apply the delay for callback.
4. In the meantime, C's console.log added to stack, executed and popped out.
5. The callback of `setTimeout` moved from Browser API to message queue.
6. The `main` function popped out from stack because there are no statements to execute
7. The callback moved from message queue to the stack since the stack is empty.
8. The console.log for B is added to the stack and display on the console.
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 4. What is the output of below equality check
```javascript
console.log(0.1 + 0.2 === 0.3);
```
- 1: false
- 2: true
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 1
This is due to the float point math problem. Since the floating point numbers are encoded in binary format, the addition operations on them lead to rounding errors. Hence, the comparison of floating points doesn't give expected results.
You can find more details about the explanation here [0.30000000000000004.com/](https://0.30000000000000004.com/)
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 5. What is the output of below code
```javascript
var y = 1;
if (function f() {}) {
y += typeof f;
}
console.log(y);
```
- 1: 1function
- 2: 1object
- 3: ReferenceError
- 4: 1undefined
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 4
The main points in the above code snippets are,
1. You can see function expression instead function declaration inside if statement. So it always returns true.
2. Since it is not declared(or assigned) anywhere, f is undefined and typeof f is undefined too.
In other words, it is same as
```javascript
var y = 1;
if ("foo") {
y += typeof f;
}
console.log(y);
```
**Note:** It returns 1object for MS Edge browser
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 6. What is the output of below code
```javascript
function foo() {
return;
{
message: "Hello World";
}
}
console.log(foo());
```
- 1: Hello World
- 2: Object {message: "Hello World"}
- 3: Undefined
- 4: SyntaxError
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 3
This is a semicolon issue. Normally semicolons are optional in JavaScript. So if there are any statements(in this case, return) missing semicolon, it is automatically inserted immediately. Hence, the function returned as undefined.
Whereas if the opening curly brace is along with the return keyword then the function is going to be returned as expected.
```javascript
function foo() {
return {
message: "Hello World",
};
}
console.log(foo()); // {message: "Hello World"}
```
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 7. What is the output of below code
```javascript
var myChars = ["a", "b", "c", "d"];
delete myChars[0];
console.log(myChars);
console.log(myChars[0]);
console.log(myChars.length);
```
- 1: [empty, 'b', 'c', 'd'], empty, 3
- 2: [null, 'b', 'c', 'd'], empty, 3
- 3: [empty, 'b', 'c', 'd'], undefined, 4
- 4: [null, 'b', 'c', 'd'], undefined, 4
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 3
The `delete` operator will delete the object property but it will not reindex the array or change its length. So the number or elements or length of the array won't be changed.
If you try to print myChars then you can observe that it doesn't set an undefined value, rather the property is removed from the array. The newer versions of Chrome use `empty` instead of `undefined` to make the difference a bit clearer.
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 8. What is the output of below code in latest Chrome
```javascript
var array1 = new Array(3);
console.log(array1);
var array2 = [];
array2[2] = 100;
console.log(array2);
var array3 = [, , ,];
console.log(array3);
```
- 1: [undefined × 3], [undefined × 2, 100], [undefined × 3]
- 2: [empty × 3], [empty × 2, 100], [empty × 3]
- 3: [null × 3], [null × 2, 100], [null × 3]
- 4: [], [100], []
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 2
The latest chrome versions display `sparse array`(they are filled with holes) using this empty x n notation. Whereas the older versions have undefined x n notation.
**Note:** The latest version of FF displays `n empty slots` notation.
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 9. What is the output of below code
```javascript
const obj = {
prop1: function () {
return 0;
},
prop2() {
return 1;
},
["prop" + 3]() {
return 2;
},
};
console.log(obj.prop1());
console.log(obj.prop2());
console.log(obj.prop3());
```
- 1: 0, 1, 2
- 2: 0, { return 1 }, 2
- 3: 0, { return 1 }, { return 2 }
- 4: 0, 1, undefined
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 1
ES6 provides method definitions and property shorthands for objects. So both prop2 and prop3 are treated as regular function values.
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 10. What is the output of below code
```javascript
console.log(1 < 2 < 3);
console.log(3 > 2 > 1);
```
- 1: true, true
- 2: true, false
- 3: SyntaxError, SyntaxError,
- 4: false, false
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 2
The important point is that if the statement contains the same operators(e.g, < or >) then it can be evaluated from left to right.
The first statement follows the below order,
1. console.log(1 < 2 < 3);
2. console.log(true < 3);
3. console.log(1 < 3); // True converted as `1` during comparison
4. True
Whereas the second statement follows the below order,
1. console.log(3 > 2 > 1);
2. console.log(true > 1);
3. console.log(1 > 1); // False converted as `0` during comparison
4. False
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 11. What is the output of below code in non-strict mode
```javascript
function printNumbers(first, second, first) {
console.log(first, second, first);
}
printNumbers(1, 2, 3);
```
- 1: 1, 2, 3
- 2: 3, 2, 3
- 3: SyntaxError: Duplicate parameter name not allowed in this context
- 4: 1, 2, 1
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 2
In non-strict mode, the regular JavaScript functions allow duplicate named parameters. The above code snippet has duplicate parameters on 1st and 3rd parameters.
The value of the first parameter is mapped to the third argument which is passed to the function. Hence, the 3rd argument overrides the first parameter.
**Note:** In strict mode, duplicate parameters will throw a Syntax Error.
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 12. What is the output of below code
```javascript
const printNumbersArrow = (first, second, first) => {
console.log(first, second, first);
};
printNumbersArrow(1, 2, 3);
```
- 1: 1, 2, 3
- 2: 3, 2, 3
- 3: SyntaxError: Duplicate parameter name not allowed in this context
- 4: 1, 2, 1
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 3
Unlike regular functions, the arrow functions doesn't not allow duplicate parameters in either strict or non-strict mode. So you can see `SyntaxError` in the console.
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 13. What is the output of below code
```javascript
const arrowFunc = () => arguments.length;
console.log(arrowFunc(1, 2, 3));
```
- 1: ReferenceError: arguments is not defined
- 2: 3
- 3: undefined
- 4: null
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 1
Arrow functions do not have an `arguments, super, this, or new.target` bindings. So any reference to `arguments` variable tries to resolve to a binding in a lexically enclosing environment. In this case, the arguments variable is not defined outside of the arrow function. Hence, you will receive a reference error.
Where as the normal function provides the number of arguments passed to the function
```javascript
const func = function () {
return arguments.length;
};
console.log(func(1, 2, 3));
```
But If you still want to use an arrow function then rest operator on arguments provides the expected arguments
```javascript
const arrowFunc = (...args) => args.length;
console.log(arrowFunc(1, 2, 3));
```
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 14. What is the output of below code
```javascript
console.log(String.prototype.trimLeft.name === "trimLeft");
console.log(String.prototype.trimLeft.name === "trimStart");
```
- 1: True, False
- 2: False, True
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 2
In order to be consistent with functions like `String.prototype.padStart`, the standard method name for trimming the whitespaces is considered as `trimStart`. Due to web web compatibility reasons, the old method name 'trimLeft' still acts as an alias for 'trimStart'. Hence, the prototype for 'trimLeft' is always 'trimStart'
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 15. What is the output of below code
```javascript
console.log(Math.max());
```
- 1: undefined
- 2: Infinity
- 3: 0
- 4: -Infinity
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 4
-Infinity is the initial comparant because almost every other value is bigger. So when no arguments are provided, -Infinity is going to be returned.
**Note:** Zero number of arguments is a valid case.
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 16. What is the output of below code
```javascript
console.log(10 == [10]);
console.log(10 == [[[[[[[10]]]]]]]);
```
- 1: True, True
- 2: True, False
- 3: False, False
- 4: False, True
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 1
As per the comparison algorithm in the ECMAScript specification(ECMA-262), the above expression converted into JS as below
```javascript
10 === Number([10].valueOf().toString()); // 10
```
So it doesn't matter about number brackets([]) around the number, it is always converted to a number in the expression.
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 17. What is the output of below code
```javascript
console.log(10 + "10");
console.log(10 - "10");
```
- 1: 20, 0
- 2: 1010, 0
- 3: 1010, 10-10
- 4: NaN, NaN
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 2
The concatenation operator(+) is applicable for both number and string types. So if any operand is string type then both operands concatenated as strings. Whereas subtract(-) operator tries to convert the operands as number type.
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 18. What is the output of below code
```javascript
console.log([0] == false);
if ([0]) {
console.log("I'm True");
} else {
console.log("I'm False");
}
```
- 1: True, I'm True
- 2: True, I'm False
- 3: False, I'm True
- 4: False, I'm False
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 1
In comparison operators, the expression `[0]` converted to Number([0].valueOf().toString()) which is resolved to false. Whereas `[0]` just becomes a truthy value without any conversion because there is no comparison operator.
</p>
</details>
#### 19. What is the output of below code
```javascript
console.log([1, 2] + [3, 4]);
```
- 1: [1,2,3,4]
- 2: [1,2][3,4]
- 3: SyntaxError
- 4: 1,23,4
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 4
The + operator is not meant or defined for arrays. So it converts arrays into strings and concatenates them.
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 20. What is the output of below code
```javascript
const numbers = new Set([1, 1, 2, 3, 4]);
console.log(numbers);
const browser = new Set("Firefox");
console.log(browser);
```
- 1: {1, 2, 3, 4}, {"F", "i", "r", "e", "f", "o", "x"}
- 2: {1, 2, 3, 4}, {"F", "i", "r", "e", "o", "x"}
- 3: [1, 2, 3, 4], ["F", "i", "r", "e", "o", "x"]
- 4: {1, 1, 2, 3, 4}, {"F", "i", "r", "e", "f", "o", "x"}
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 1
Since `Set` object is a collection of unique values, it won't allow duplicate values in the collection. At the same time, it is case sensitive data structure.
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 21. What is the output of below code
```javascript
console.log(NaN === NaN);
```
- 1: True
- 2: False
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 2
JavaScript follows IEEE 754 spec standards. As per this spec, NaNs are never equal for floating-point numbers.
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 22. What is the output of below code
```javascript
let numbers = [1, 2, 3, 4, NaN];
console.log(numbers.indexOf(NaN));
```
- 1: 4
- 2: NaN
- 3: SyntaxError
- 4: -1
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 4
The `indexOf` uses strict equality operator(===) internally and `NaN === NaN` evaluates to false. Since indexOf won't be able to find NaN inside an array, it returns -1 always.
But you can use `Array.prototype.findIndex` method to find out the index of NaN in an array or You can use `Array.prototype.includes` to check if NaN is present in an array or not.
```javascript
let numbers = [1, 2, 3, 4, NaN];
console.log(numbers.findIndex(Number.isNaN)); // 4
console.log(numbers.includes(NaN)); // true
```
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 23. What is the output of below code
```javascript
let [a, ...b,] = [1, 2, 3, 4, 5];
console.log(a, b);
```
- 1: 1, [2, 3, 4, 5]
- 2: 1, {2, 3, 4, 5}
- 3: SyntaxError
- 4: 1, [2, 3, 4]
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 3
When using rest parameters, trailing commas are not allowed and will throw a SyntaxError.
If you remove the trailing comma then it displays 1st answer
```javascript
let [a, ...b] = [1, 2, 3, 4, 5];
console.log(a, b); // 1, [2, 3, 4, 5]
```
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 25. What is the output of below code
```javascript
async function func() {
return 10;
}
console.log(func());
```
- 1: Promise {\<fulfilled\>: 10}
- 2: 10
- 3: SyntaxError
- 4: Promise {\<rejected\>: 10}
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 1
Async functions always return a promise. But even if the return value of an async function is not explicitly a promise, it will be implicitly wrapped in a promise. The above async function is equivalent to below expression,
```javascript
function func() {
return Promise.resolve(10);
}
```
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 26. What is the output of below code
```javascript
async function func() {
await 10;
}
console.log(func());
```
- 1: Promise {\<fulfilled\>: 10}
- 2: 10
- 3: SyntaxError
- 4: Promise {\<resolved\>: undefined}
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 4
The await expression returns value 10 with promise resolution and the code after each await expression can be treated as existing in a `.then` callback. In this case, there is no return expression at the end of the function. Hence, the default return value of `undefined` is returned as the resolution of the promise. The above async function is equivalent to below expression,
```javascript
function func() {
return Promise.resolve(10).then(() => undefined);
}
```
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 27. What is the output of below code
```javascript
function delay() {
return new Promise(resolve => setTimeout(resolve, 2000));
}
async function delayedLog(item) {
await delay();
console.log(item);
}
async function processArray(array) {
array.forEach(item => {
await delayedLog(item);
})
}
processArray([1, 2, 3, 4]);
```
- 1: SyntaxError
- 2: 1, 2, 3, 4
- 3: 4, 4, 4, 4
- 4: 4, 3, 2, 1
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 1
Even though “processArray” is an async function, the anonymous function that we use for `forEach` is synchronous. If you use await inside a synchronous function then it throws a syntax error.
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 28. What is the output of below code
```javascript
function delay() {
return new Promise((resolve) => setTimeout(resolve, 2000));
}
async function delayedLog(item) {
await delay();
console.log(item);
}
async function process(array) {
array.forEach(async (item) => {
await delayedLog(item);
});
console.log("Process completed!");
}
process([1, 2, 3, 5]);
```
- 1: 1 2 3 5 and Process completed!
- 2: 5 5 5 5 and Process completed!
- 3: Process completed! and 5 5 5 5
- 4: Process completed! and 1 2 3 5
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 4
The forEach method will not wait until all items are finished but it just runs the tasks and goes next. Hence, the last statement is displayed first followed by a sequence of promise resolutions.
But you control the array sequence using for..of loop,
```javascript
async function processArray(array) {
for (const item of array) {
await delayedLog(item);
}
console.log("Process completed!");
}
```
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 29. What is the output of below code
```javascript
var set = new Set();
set.add("+0").add("-0").add(NaN).add(undefined).add(NaN);
console.log(set);
```
- 1: Set(4) {"+0", "-0", NaN, undefined}
- 2: Set(3) {"+0", NaN, undefined}
- 3: Set(5) {"+0", "-0", NaN, undefined, NaN}
- 4: Set(4) {"+0", NaN, undefined, NaN}
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 1
Set has few exceptions from equality check,
1. All NaN values are equal
2. Both +0 and -0 considered as different values
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 30. What is the output of below code
```javascript
const sym1 = Symbol("one");
const sym2 = Symbol("one");
const sym3 = Symbol.for("two");
const sym4 = Symbol.for("two");
console.log(sym1 === sym2, sym3 === sym4);
```
- 1: true, true
- 2: true, false
- 3: false, true
- 4: false, false
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 3
Symbol follows below conventions,
1. Every symbol value returned from Symbol() is unique irrespective of the optional string.
2. `Symbol.for()` function creates a symbol in a global symbol registry list. But it doesn't necessarily create a new symbol on every call, it checks first if a symbol with the given key is already present in the registry and returns the symbol if it is found. Otherwise a new symbol created in the registry.
**Note:** The symbol description is just useful for debugging purposes.
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 31. What is the output of below code
```javascript
const sym1 = new Symbol("one");
console.log(sym1);
```
- 1: SyntaxError
- 2: one
- 3: Symbol('one')
- 4: Symbol
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 1
`Symbol` is a just a standard function and not an object constructor(unlike other primitives new Boolean, new String and new Number). So if you try to call it with the new operator will result in a TypeError
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 32. What is the output of below code
```javascript
let myNumber = 100;
let myString = "100";
if (!typeof myNumber === "string") {
console.log("It is not a string!");
} else {
console.log("It is a string!");
}
if (!typeof myString === "number") {
console.log("It is not a number!");
} else {
console.log("It is a number!");
}
```
- 1: SyntaxError
- 2: It is not a string!, It is not a number!
- 3: It is not a string!, It is a number!
- 4: It is a string!, It is a number!
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 4
The return value of `typeof myNumber` or `typeof myString` is always a truthy value (either "number" or "string"). The ! operator operates on either `typeof myNumber` or `typeof myString`, converting them to boolean values. Since the value of both `!typeof myNumber` and `!typeof myString` is false, the if condition fails, and control goes to else block.
To make the ! operator operate on the equality expression, one needs to add parentheses:
```
if (!(typeof myNumber === "string"))
```
Or simply use the inequality operator:
```
if (typeof myNumber !== "string")
```
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 33. What is the output of below code
```javascript
console.log(
JSON.stringify({ myArray: ["one", undefined, function () {}, Symbol("")] })
);
console.log(
JSON.stringify({ [Symbol.for("one")]: "one" }, [Symbol.for("one")])
);
```
- 1: {"myArray":['one', undefined, {}, Symbol]}, {}
- 2: {"myArray":['one', null,null,null]}, {}
- 3: {"myArray":['one', null,null,null]}, "{ [Symbol.for('one')]: 'one' }, [Symbol.for('one')]"
- 4: {"myArray":['one', undefined, function(){}, Symbol('')]}, {}
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 2
The symbols has below constraints,
1. The undefined, Functions, and Symbols are not valid JSON values. So those values are either omitted (in an object) or changed to null (in an array). Hence, it returns null values for the value array.
2. All Symbol-keyed properties will be completely ignored. Hence it returns an empty object({}).
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 34. What is the output of below code
```javascript
class A {
constructor() {
console.log(new.target.name);
}
}
class B extends A {
constructor() {
super();
}
}
new A();
new B();
```
- 1: A, A
- 2: A, B
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 2
Using constructors, `new.target` refers to the constructor (points to the class definition of class which is initialized) that was directly invoked by new. This also applies to the case if the constructor is in a parent class and was delegated from a child constructor.
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 35. What is the output of below code
```javascript
const [x, ...y, z] = [1, 2, 3, 4];
console.log(x, y, z);
```
- 1: 1, [2, 3], 4
- 2: 1, [2, 3, 4], undefined
- 3: 1, [2], 3
- 4: SyntaxError
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 4
It throws a syntax error because the rest element should not have a trailing comma. You should always consider using a rest operator as the last element.
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 36. What is the output of below code
```javascript
const { a: x = 10, b: y = 20 } = { a: 30 };
console.log(x);
console.log(y);
```
- 1: 30, 20
- 2: 10, 20
- 3: 10, undefined
- 4: 30, undefined
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 1
The object property follows below rules,
1. The object properties can be retrieved and assigned to a variable with a different name
2. The property assigned a default value when the retrieved value is `undefined`
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 37. What is the output of below code
```javascript
function area({ length = 10, width = 20 }) {
console.log(length * width);
}
area();
```
- 1: 200
- 2: Error
- 3: undefined
- 4: 0
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 2
If you leave out the right-hand side assignment for the destructuring object, the function will look for at least one argument to be supplied when invoked. Otherwise you will receive an error `Error: Cannot read property 'length' of undefined` as mentioned above.
You can avoid the error with either of the below changes,
1. **Pass at least an empty object:**
```javascript
function area({ length = 10, width = 20 }) {
console.log(length * width);
}
area({});
```
2. **Assign default empty object:**
```javascript
function area({ length = 10, width = 20 } = {}) {
console.log(length * width);
}
area();
```
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 38. What is the output of below code
```javascript
const props = [
{ id: 1, name: "John" },
{ id: 2, name: "Jack" },
{ id: 3, name: "Tom" },
];
const [, , { name }] = props;
console.log(name);
```
- 1: Tom
- 2: Error
- 3: undefined
- 4: John
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 1
It is possible to combine Array and Object destructuring. In this case, the third element in the array props accessed first followed by name property in the object.
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 39. What is the output of below code
```javascript
function checkType(num = 1) {
console.log(typeof num);
}
checkType();
checkType(undefined);
checkType("");
checkType(null);
```
- 1: number, undefined, string, object
- 2: undefined, undefined, string, object
- 3: number, number, string, object
- 4: number, number, number, number
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 3
If the function argument is set implicitly(not passing argument) or explicitly to undefined, the value of the argument is the default parameter. Whereas for other falsy values('' or null), the value of the argument is passed as a parameter.
Hence, the result of function calls categorized as below,
1. The first two function calls logs number type since the type of default value is number
2. The type of '' and null values are string and object type respectively.
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 40. What is the output of below code
```javascript
function add(item, items = []) {
items.push(item);
return items;
}
console.log(add("Orange"));
console.log(add("Apple"));
```
- 1: ['Orange'], ['Orange', 'Apple']
- 2: ['Orange'], ['Apple']
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 2
Since the default argument is evaluated at call time, a new object is created each time the function is called. So in this case, the new array is created and an element pushed to the default empty array.
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 41. What is the output of below code
```javascript
function greet(greeting, name, message = greeting + " " + name) {
console.log([greeting, name, message]);
}
greet("Hello", "John");
greet("Hello", "John", "Good morning!");
```
- 1: SyntaxError
- 2: ['Hello', 'John', 'Hello John'], ['Hello', 'John', 'Good morning!']
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 2
Since parameters defined earlier are available to later default parameters, this code snippet doesn't throw any error.
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 42. What is the output of below code
```javascript
function outer(f = inner()) {
function inner() {
return "Inner";
}
}
outer();
```
- 1: ReferenceError
- 2: Inner
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 1
The functions and variables declared in the function body cannot be referred from default value parameter initializers. If you still try to access, it throws a run-time ReferenceError(i.e, `inner` is not defined).
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 43. What is the output of below code
```javascript
function myFun(x, y, ...manyMoreArgs) {
console.log(manyMoreArgs);
}
myFun(1, 2, 3, 4, 5);
myFun(1, 2);
```
- 1: [3, 4, 5], undefined
- 2: SyntaxError
- 3: [3, 4, 5], []
- 4: [3, 4, 5], [undefined]
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 3
The rest parameter is used to hold the remaining parameters of a function and it becomes an empty array if the argument is not provided.
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 44. What is the output of below code
```javascript
const obj = { key: "value" };
const array = [...obj];
console.log(array);
```
- 1: ['key', 'value']
- 2: TypeError
- 3: []
- 4: ['key']
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 2
Spread syntax can be applied only to iterable objects. By default, Objects are not iterable, but they become iterable when used in an Array, or with iterating functions such as `map(), reduce(), and assign()`. If you still try to do it, it still throws `TypeError: obj is not iterable`.
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 45. What is the output of below code
```javascript
function* myGenFunc() {
yield 1;
yield 2;
yield 3;
}
var myGenObj = new myGenFunc();
console.log(myGenObj.next().value);
```
- 1: 1
- 2: undefined
- 3: SyntaxError
- 4: TypeError
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 4
Generators are not constructible type. But if you still proceed to do, there will be an error saying "TypeError: myGenFunc is not a constructor"
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 46. What is the output of below code
```javascript
function* yieldAndReturn() {
yield 1;
return 2;
yield 3;
}
var myGenObj = yieldAndReturn();
console.log(myGenObj.next());
console.log(myGenObj.next());
console.log(myGenObj.next());
```
- 1: { value: 1, done: false }, { value: 2, done: true }, { value: undefined, done: true }
- 2: { value: 1, done: false }, { value: 2, done: false }, { value: undefined, done: true }
- 3: { value: 1, done: false }, { value: 2, done: true }, { value: 3, done: true }
- 4: { value: 1, done: false }, { value: 2, done: false }, { value: 3, done: true }
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 1
A return statement in a generator function will make the generator finish. If a value is returned, it will be set as the value property of the object and done property to true. When a generator is finished, subsequent next() calls return an object of this form: `{value: undefined, done: true}`.
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 47. What is the output of below code
```javascript
const myGenerator = (function* () {
yield 1;
yield 2;
yield 3;
})();
for (const value of myGenerator) {
console.log(value);
break;
}
for (const value of myGenerator) {
console.log(value);
}
```
- 1: 1,2,3 and 1,2,3
- 2: 1,2,3 and 4,5,6
- 3: 1 and 1
- 4: 1
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 4
The generator should not be re-used once the iterator is closed. i.e, Upon exiting a loop(on completion or using break & return), the generator is closed and trying to iterate over it again does not yield any more results. Hence, the second loop doesn't print any value.
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 48. What is the output of below code
```javascript
const num = 0o38;
console.log(num);
```
- 1: SyntaxError
- 2: 38
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 1
If you use an invalid number(outside of 0-7 range) in the octal literal, JavaScript will throw a SyntaxError. In ES5, it treats the octal literal as a decimal number.
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 49. What is the output of below code
```javascript
const squareObj = new Square(10);
console.log(squareObj.area);
class Square {
constructor(length) {
this.length = length;
}
get area() {
return this.length * this.length;
}
set area(value) {
this.area = value;
}
}
```
- 1: 100
- 2: ReferenceError
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 2
Unlike function declarations, class declarations are not hoisted. i.e, First You need to declare your class and then access it, otherwise it will throw a ReferenceError "Uncaught ReferenceError: Square is not defined".
**Note:** Class expressions also applies to the same hoisting restrictions of class declarations.
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 50. What is the output of below code
```javascript
function Person() {}
Person.prototype.walk = function () {
return this;
};
Person.run = function () {
return this;
};
let user = new Person();
let walk = user.walk;
console.log(walk());
let run = Person.run;
console.log(run());
```
- 1: undefined, undefined
- 2: Person, Person
- 3: SyntaxError
- 4: Window, Window
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 4
When a regular or prototype method is called without a value for **this**, the methods return an initial this value if the value is not undefined. Otherwise global window object will be returned. In our case, the initial `this` value is undefined so both methods return window objects.
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 51. What is the output of below code
```javascript
class Vehicle {
constructor(name) {
this.name = name;
}
start() {
console.log(`${this.name} vehicle started`);
}
}
class Car extends Vehicle {
start() {
console.log(`${this.name} car started`);
super.start();
}
}
const car = new Car("BMW");
console.log(car.start());
```
- 1: SyntaxError
- 2: BMW vehicle started, BMW car started
- 3: BMW car started, BMW vehicle started
- 4: BMW car started, BMW car started
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 3
The super keyword is used to call methods of a superclass. Unlike other languages the super invocation doesn't need to be a first statement. i.e, The statements will be executed in the same order of code.
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 52. What is the output of below code
```javascript
const USER = { age: 30 };
USER.age = 25;
console.log(USER.age);
```
- 1: 30
- 2: 25
- 3: Uncaught TypeError
- 4: SyntaxError
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 2
Even though we used constant variables, the content of it is an object and the object's contents (e.g properties) can be altered. Hence, the change is going to be valid in this case.
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 53. What is the output of below code
```javascript
console.log("🙂" === "🙂");
```
- 1: false
- 2: true
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 2
Emojis are unicodes and the unicode for smile symbol is "U+1F642". The unicode comparision of same emojies is equivalent to string comparison. Hence, the output is always true.
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 54. What is the output of below code?
```javascript
console.log(typeof typeof typeof true);
```
- 1: string
- 2: boolean
- 3: NaN
- 4: number
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 1
The typeof operator on any primitive returns a string value. So even if you apply the chain of typeof operators on the return value, it is always string.
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 55. What is the output of below code?
```javascript
let zero = new Number(0);
if (zero) {
console.log("If");
} else {
console.log("Else");
}
```
- 1: If
- 2: Else
- 3: NaN
- 4: SyntaxError
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 1
1. The type of operator on new Number always returns object. i.e, typeof new Number(0) --> object.
2. Objects are always truthy in if block
Hence the above code block always goes to if section.
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 55. What is the output of below code in non strict mode?
```javascript
let msg = "Good morning!!";
msg.name = "John";
console.log(msg.name);
```
- 1: ""
- 2: Error
- 3: John
- 4: Undefined
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 4
It returns undefined for non-strict mode and returns Error for strict mode. In non-strict mode, the wrapper object is going to be created and get the mentioned property. But the object get disappeared after accessing the property in next line.
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 56. What is the output of below code?
```javascript
let count = 10;
(function innerFunc() {
if (count === 10) {
let count = 11;
console.log(count);
}
console.log(count);
})();
```
- 1: 11, 10
- 2: 11, 11
- 3: 10, 11
- 4: 10, 10
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 1
11 and 10 is logged to the console.
The innerFunc is a closure which captures the count variable from the outerscope. i.e, 10. But the conditional has another local variable `count` which overwrites the ourter `count` variable. So the first console.log displays value 11.
Whereas the second console.log logs 10 by capturing the count variable from outerscope.
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 57. What is the output of below code ?
- 1: console.log(true && 'hi');
- 2: console.log(true && 'hi' && 1);
- 3: console.log(true && '' && 0);
<details><summary><b>Answer</b></summary>
- 1: hi
- 2: 1
- 3: ''
Reason : The operator returns the value of the first falsy operand encountered when evaluating from left to right, or the value of the last operand if they are all truthy.
**Note:** Below these values are consider as falsy value
- 1: 0
- 2: ''
- 3: null
- 4: undefined
- 5: NAN
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 58. What is the output of below code ?
```javascript
let arr = [1, 2, 3];
let str = "1,2,3";
console.log(arr == str);
```
- 1: false
- 2: Error
- 3: true
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 3
Arrays have their own implementation of `toString` method that returns a comma-separated list of elements. So the above code snippet returns true. In order to avoid conversion of array type, we should use === for comparison.
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 59. What is the output of below code?
```javascript
getMessage();
var getMessage = () => {
console.log("Good morning");
};
```
- 1: Good morning
- 2: getMessage is not a function
- 3: getMessage is not defined
- 4: Undefined
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 2
Hoisting will move variables and functions to be the top of scope. Even though getMessage is an arrow function the above function will considered as a varible due to it's variable declaration or assignment. So the variables will have undefined value in memory phase and throws an error '`getMessage` is not a function' at the code execution phase.
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 60. What is the output of below code?
```javascript
let quickPromise = Promise.resolve();
quickPromise.then(() => console.log("promise finished"));
console.log("program finished");
```
- 1: program finished
- 2: Cannot predict the order
- 3: program finished, promise finished
- 4: promise finished, program finished
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 3
Even though a promise is resolved immediately, it won't be executed immediately because its **.then/catch/finally** handlers or callbacks(aka task) are pushed into the queue. Whenever the JavaScript engine becomes free from the current program, it pulls a task from the queue and executes it. This is the reason why last statement is printed first before the log of promise handler.
**Note:** We call the above queue as "MicroTask Queue"
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 61. What is the output of below code?
```javascript
console
.log("First line")
[("a", "b", "c")].forEach((element) => console.log(element));
console.log("Third line");
```
- 1: `First line`, then print `a, b, c` in a new line, and finally print `Third line` as next line
- 2: `First line`, then print `a, b, c` in a first line, and print `Third line` as next line
- 3: Missing semi-colon error
- 4: Cannot read properties of undefined
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 4
When JavaScript encounters a line break without a semicolon, the JavaScript parser will automatically add a semicolon based on a set of rules called `Automatic Semicolon Insertion` which determines whether line break as end of statement or not to insert semicolon. But it does not assume a semicolon before square brackets [...]. So the first two lines considered as a single statement as below.
```javascript
console
.log("First line")
[("a", "b", "c")].forEach((element) => console.log(element));
```
Hence, there will be **cannot read properties of undefined** error while applying the array square bracket on log function.
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 62. Write a function that returns a random HEX color
<details><summary><b>Solution 1 (Iterative generation)</b></summary>
<p>
```javascript
const HEX_ALPHABET = [
"0",
"1",
"2",
"3",
"4",
"5",
"6",
"7",
"8",
"9",
"a",
"b",
"c",
"d",
"e",
"f",
];
const HEX_PREFIX = "#";
const HEX_LENGTH = 6;
function generateRandomHex() {
let randomHex = "";
for (let i = 0; i < HEX_LENGTH; i++) {
const randomIndex = Math.floor(Math.random() * HEX_ALPHABET.length);
randomHex += HEX_ALPHABET[randomIndex];
}
return HEX_PREFIX + randomHex;
}
```
</p>
</details>
<details><summary><b>Solution 2 (One-liner)</b></summary>
<p>
```javascript
const HEX_PREFIX = "#";
const HEX_RADIX = 16;
const HEX_LENGTH = 6;
function generateRandomHex() {
return (
HEX_PREFIX +
Math.floor(Math.random() * 0xffffff)
.toString(HEX_RADIX)
.padStart(HEX_LENGTH, "0")
);
}
```
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 63. What is the output of below code?
```javascript
var of = ["of"];
for (var of of of) {
console.log(of);
}
```
- 1: of
- 2: SyntaxError: Unexpected token of
- 3: SyntaxError: Identifier 'of' has already been declared
- 4: ReferenceError: of is not defined
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 1
In JavaScript, `of` is not considered as a reserved keyword. So the variable declaration with `of` is accepted and prints the array value `of` using for..of loop.
But if you use reserved keyword such as `in` then there will be a syntax error saying `SyntaxError: Unexpected token in`,
```javascript
var in = ['in'];
for(var in in in) {
console.log(in[in]);
}
```
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 64. What is the output of below code?
```javascript
const numbers = [11, 25, 31, 23, 33, 18, 200];
numbers.sort();
console.log(numbers);
```
- 1: [11, 18, 23, 25, 31, 33, 200]
- 2: [11, 18, 200, 23, 25, 31, 33]
- 3: [11, 25, 31, 23, 33, 18, 200]
- 4: Cannot sort numbers
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 2
By default, the sort method sorts elements alphabetically. This is because elemented converted to strings and strings compared in UTF-16 code units order. Hence, you will see the above numbers not sorted as expected. In order to sort numerically just supply a comparator function which handles numeric sorts.
```javascript
const numbers = [11, 25, 31, 23, 33, 18, 200];
numbers.sort((a, b) => a - b);
console.log(numbers);
```
**Note:** Sort() method changes the original array.
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 65. What is the output order of below code?
```javascript
setTimeout(() => {
console.log("1");
}, 0);
Promise.resolve("hello").then(() => console.log("2"));
console.log("3");
```
- 1: 1, 2, 3
- 2: 1, 3, 2
- 3: 3, 1, 2
- 4: 3, 2, 1
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 4
When the JavaScript engine parses the above code, the first two statements are asynchronous which will be executed later and third statement is synchronous statement which will be moved to callstack, executed and prints the number 3 in the console. Next, Promise is native in ES6 and it will be moved to Job queue which has high priority than callback queue in the execution order. At last, since setTimeout is part of WebAPI the callback function moved to callback queue and executed. Hence, you will see number 2 printed first followed by 1.
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 66. What is the output of below code?
```javascript
console.log(name);
console.log(message());
var name = "John";
(function message() {
console.log("Hello John: Welcome");
});
```
- 1: John, Hello John: Welcome
- 2: undefined, Hello John, Welcome
- 3: Reference error: name is not defined, Reference error: message is not defined
- 4: undefined, Reference error: message is not defined
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 4
IIFE(Immediately Invoked Function Expression) is just like any other function expression which won't be hoisted. Hence, there will be a reference error for message call.
The behavior would be the same with below function expression of message1,
```javascript
console.log(name);
console.log(message());
var name = 'John';
var message = function () {
console.log('Hello John: Welcome');
});
```
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 67. What is the output of below code?
```javascript
message();
function message() {
console.log("Hello");
}
function message() {
console.log("Bye");
}
```
- 1: Reference error: message is not defined
- 2: Hello
- 3: Bye
- 4: Compile time error
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 3
As part of hoisting, initially JavaScript Engine or compiler will store first function in heap memory but later rewrite or replaces with redefined function content.
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 68. What is the output of below code?
```javascript
var currentCity = "NewYork";
var changeCurrentCity = function () {
console.log("Current City:", currentCity);
var currentCity = "Singapore";
console.log("Current City:", currentCity);
};
changeCurrentCity();
```
- 1: NewYork, Singapore
- 2: NewYork, NewYork
- 3: undefined, Singapore
- 4: Singapore, Singapore
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 3
Due to hositing feature, the variables declared with `var` will have `undefined` value in the creation phase so the outer variable `currentCity` will get same `undefined` value. But after few lines of code JavaScript engine found a new function call(`changeCurrentCity()`) to update the current city with `var` re-declaration. Since each function call will create a new execution context, the same variable will have `undefined` value before the declaration and new value(`Singapore`) after the declarion. Hence, the value `undefined` print first followed by new value `Singapore` in the execution phase.
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 69. What is the output of below code in an order?
```javascript
function second() {
var message;
console.log(message);
}
function first() {
var message = "first";
second();
console.log(message);
}
var message = "default";
first();
console.log(message);
```
- 1: undefined, first, default
- 2: default, default, default
- 3: first, first, default
- 4: undefined, undefined, undefined
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 1
Each context(global or functional) has it's own variable environment and the callstack of variables in a LIFO order. So you can see the message variable value from second, first functions in an order followed by global context message variable value at the end.
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 70. What is the output of below code?
```javascript
var expressionOne = function functionOne() {
console.log("functionOne");
};
functionOne();
```
- 1: functionOne is not defined
- 2: functionOne
- 3: console.log("functionOne")
- 4: undefined
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 1
The function call `functionOne` is not going to be part of scope chain and it has it's own execution context with the enclosed variable environment. i.e, It won't be accessed from global context. Hence, there will be an error while invoking the function as `functionOne is not defined`.
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 71. What is the output of below code?
```javascript
const user = {
name: "John",
eat() {
console.log(this);
var eatFruit = function () {
console.log(this);
};
eatFruit();
},
};
user.eat();
```
- 1: {name: "John", eat: f}, {name: "John", eat: f}
- 2: Window {...}, Window {...}
- 3: {name: "John", eat: f}, undefined
- 4: {name: "John", eat: f}, Window {...}
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 4
`this` keyword is dynamic scoped but not lexically scoped . In other words, it doesn't matter where `this` has been written but how it has been invoked really matter. In the above code snippet, the `user` object invokes `eat` function so `this` keyword refers to `user` object but `eatFruit` has been invoked by `eat` function and `this` will have default `Window` object.
The above pit fall fixed by three ways,
1. In ES6, the arrow function will make `this` keyword as lexically scoped. Since the surrounding object of `this` object is `user` object, the `eatFruit` function will contain `user` object for `this` object.
```javascript
const user = {
name: "John",
eat() {
console.log(this);
var eatFruit = () => {
console.log(this);
};
eatFruit();
},
};
user.eat();
```
The next two solutions have been used before ES6 introduced.
2. It is possible create a reference of `this` into a separate variable and use that new variable inplace of `this` keyword inside `eatFruit` function. This is a common practice in jQuery and AngularJS before ES6 introduced.
```javascript
const user = {
name: "John",
eat() {
console.log(this);
var self = this;
var eatFruit = () => {
console.log(self);
};
eatFruit();
},
};
user.eat();
```
3. The `eatFruit` function can bind explicitly with `this` keyword where it refers `Window` object.
```javascript
const user = {
name: "John",
eat() {
console.log(this);
var eatFruit = function () {
console.log(this);
};
return eatFruit.bind(this);
},
};
user.eat()();
```
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 72. What is the output of below code?
```javascript
let message = "Hello World!";
message[0] = "J";
console.log(message);
let name = "John";
name = name + " Smith";
console.log(name);
```
- 1: Jello World!, John Smith
- 2: Jello World!, John
- 3: Hello World!, John Smith
- 4: Hello World!, John
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 3
In JavaScript, primitives are immutable i.e. there is no way to change a primitive value once it gets created. So when you try to update the string's first character, there is no change in the string value and prints the same initial value `Hello World!`. Whereas in the later example, the concatenated value is re-assigned to the same variable which will result into creation of new memory block with the reference pointing to `John Smith` value and the old memory block value(`John`) will be garbage collected.
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 73. What is the output of below code?
```javascript
let user1 = {
name: "Jacob",
age: 28,
};
let user2 = {
name: "Jacob",
age: 28,
};
console.log(user1 === user2);
```
- 1: True
- 2: False
- 3: Compile time error
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 2
In JavaScript, the variables such as objects, arrays and functions comes under pass by reference. When you try to compare two objects with same content, it is going to compare memory address or reference of those variables. These variables always create separate memory blocks hence the comparison is always going to return false value.
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 74. What is the output of below code?
```javascript
function greeting() {
setTimeout(function () {
console.log(message);
}, 5000);
const message = "Hello, Good morning";
}
greeting();
```
- 1: Undefined
- 2: Reference error:
- 3: Hello, Good morning
- 4: null
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 3
The variable `message` is still treated as closure(since it has been used in inner function) eventhough it has been declared after setTimeout function. The function with in setTimeout function will be sent to WebAPI and the variable declaration executed with in 5 seconds with the assigned value. Hence, the text declared for the variable will be displayed.
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 75. What is the output of below code?
```javascript
const a = new Number(10);
const b = 10;
console.log(a === b);
```
- 1: False
- 2: True
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 1
Eventhough both variables `a` and `b` refer a number value, the first declaration is based on constructor function and the type of the variable is going to be `object` type. Whereas the second declaration is primitive assignment with a number and the type is `number` type. Hence, the equality operator `===` will output `false` value.
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 76. What is the type of below function?
```javascript
function add(a, b) {
console.log("The input arguments are: ", a, b);
return a + b;
}
```
- 1: Pure function
- 2: Impure function
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 2
Eventhough the above function returns the same result for the same arguments(input) that are passed in the function, the `console.log()` statement causes a function to have side effects because it affects the state of an external code. i.e, the `console` object's state and depends on it to perform the job. Hence, the above function considered as impure function.
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 77. What is the output of below code?
```javascript
const promiseOne = new Promise((resolve, reject) => setTimeout(resolve, 4000));
const promiseTwo = new Promise((resolve, reject) => setTimeout(reject, 4000));
Promise.all([promiseOne, promiseTwo]).then((data) => console.log(data));
```
- 1: [{status: "fullfilled", value: undefined}, {status: "rejected", reason: undefined}]
- 2: [{status: "fullfilled", value: undefined}, Uncaught(in promise)]
- 3: Uncaught (in promise)
- 4: [Uncaught(in promise), Uncaught(in promise)]
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 3
The above promises settled at the same time but one of them resolved and other one rejected. When you use `.all` method on these promises, the result will be short circuted by throwing an error due to rejection in second promise. But If you use `.allSettled` method then result of both the promises will be returned irrespective of resolved or rejected promise status without throwing any error.
```javascript
Promise.allSettled([promiseOne, promiseTwo]).then((data) => console.log(data));
```
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 78. What is the output of below code?
```javascript
try {
setTimeout(() => {
console.log("try block");
throw new Error(`An exception is thrown`);
}, 1000);
} catch (err) {
console.log("Error: ", err);
}
```
- 1: try block, Error: An exception is thrown
- 2: Error: An exception is thrown
- 3: try block, Uncaught Error: Exception is thrown
- 4: Uncaught Error: Exception is thrown
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 3
If you put `setTimeout` and `setInterval` methods inside the try clause and an exception is thrown, the catch clause will not catch any of them. This is because the try...catch statement works synchronously, and the function in the above code is executed asynchronously after a certain period of time. Hence, you will see runtime exception without catching the error. To resolve this issue, you have to put the try...catch block inside the function as below,
```javascript
setTimeout(() => {
try {
console.log("try block");
throw new Error(`An exception is thrown`);
} catch (err) {
console.log("Error: ", err);
}
}, 1000);
```
You can use `.catch()` function in promises to avoid these issues with asynchronous code.
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 79. What is the output of below code?
```javascript
let a = 10;
if (true) {
let a = 20;
console.log(a, "inside");
}
console.log(a, "outside");
```
- 1: 20, "inside" and 20, "outside"
- 2: 20, "inside" and 10, "outside"
- 3: 10, "inside" and 10, "outside"
- 4: 10, "inside" and 20, "outside"
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 2
The variable "a" declared inside "if" has block scope and does not affect the value of the outer "a" variable.
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 80. What is the output of below code?
```javascript
let arr = [1, 2, 3, 4, 5, -6, 7];
arr.length = 0;
console.log(arr);
```
- 1: 0
- 2: Undefined
- 3: null
- 4: [ ]
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 4
The length of the array 'arr' has been set to 0, so the array becomes empty.
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
#### 81. How do you verify two strings are anagrams?
An anagram is a word or phrase formed by rearranging all the letters of a different word or phrase exactly once. For example, the anagrams of "eat" word are "tea" and "ate".
You can split each word into characters, followed by sort action and later join them back. After that you can compare those two words to verify whether those two words are anagrams or not.
```javascript
function verifyAnagrams(word1, word2) {
return word1.split("").sort().join("") === word2.split("").sort().join("")
}
console.log(verifyAnagrams("eat", "ate"));
```
**[⬆ Back to Top](#table-of-contents)**
#### 82. What is the output of below code?
```javascript
printHello();
printMessage();
function printHello() {
console.log('Hello')
function printMessage() {
console.log("Good day")
}
}
```
- 1: Hello, Good day
- 2: Reference Error: printHello is not defined, Reference Error: printMessage is not defined
- 3: Reference Error: printHello is not defined, Good day
- 4: Hello, Reference Error: printMessage is not defined
<details><summary><b>Answer</b></summary>
<p>
##### Answer: 4
The function `printHello` is hoisted to the top of the global scope and prints "Hello" to the console. Even `printMessage` function is hoisted, but it is lifted to the local scope(in "printHello") it was declared in. That is the reason you will endup with reference error for second function call.
But if the second function is invoked in the first function itself, there won't be any reference error.
```javascript
printHello();
function printHello() {
printMessage();
console.log('Hello')
function printMessage() {
console.log("Good day")
}
}
```
</p>
</details>
---
**[⬆ Back to Top](#table-of-contents)**
## Disclaimer
The questions provided in this repository are the summary of frequently asked questions across numerous companies. We cannot guarantee that these questions will actually be asked during your interview process, nor should you focus on memorizing all of them. The primary purpose is for you to get a sense of what some companies might ask — do not get discouraged if you don't know the answer to all of them — that is ok!
Good luck with your interview 😊
---
| 📘 Anki/flashcards version of the questions and answers. Based on sudheerj/javascript-interview-questions | angular,core-javascript,javascript,javascript-applications,javascript-interview-questions,react,vanilla-javascript,vuejs | 2023-08-29T19:50:46Z | 2024-03-04T23:36:55Z | 2024-03-04T23:24:03Z | 86 | 0 | 589 | 0 | 0 | 7 | null | null | JavaScript |
Alireza-WebDeveloper/Tailwindcss-Parcel | main | null | null | javascript,modelviewcontroller,mvc,parcel,parcel-bundler,tailwindcss | 2023-08-10T15:48:41Z | 2023-08-11T07:45:19Z | null | 1 | 0 | 2 | 0 | 2 | 7 | null | null | HTML |
kanugurajesh/Udaan-Home-Page | main | # Udaan-home-page
Developed home page for the udaan translation tool which aims to resolve the translation problems of the modern India. It is currently used as the home page for the project and serving thousands of people and organisations to help them navigate through the tool
| Home page for udaan project | base,css3,home-page,html5,javascript,open-source,udaan,responsive,ui-ux-design,currently-in-production | 2023-08-14T14:17:24Z | 2023-11-23T17:15:10Z | null | 2 | 0 | 184 | 0 | 0 | 7 | null | null | HTML |
arthur-fontaine/agrume | main | <p align="center">
<img src="./.github/assets/logo.png" width="200px" align="center" alt="Agrume logo" />
<h1 align="center">Agrume</h1>
<p align="center">
<a href="https://agrume.js.org">https://agrume.js.org</a>
<br/>
API development made for front-end developers!
<br/>
Easy, customizable and type-safe.
</p>
</p>
## Getting started
Front-end developers are often afraid of the backend. They don't know how to start, what to do, and how to do it. Agrume is a tool that makes developing API endpoints as easy as writing a function. Best of all, it's type-safe!
Let's see an example:
```tsx
import { createRoute } from 'agrume'
const getDogImage = createRoute(
async () => {
// `database` is a fake database that should not be accessible from the client
const dog = database.dogs.findFirst({
select: ['imageBase64'],
where: { isGoodBoy: true }
})
return dog.imageBase64
}
)
export const Dog = function () {
const [dogImage, setDogImage] = useState('')
useEffect(() => {
getDogImage().then(setDogImage)
}, [])
return <img src={dogImage} />
}
```
### Motivation
As a student, I frequently have to build projects in teams and in a short amount of time. These projects require a backend, but many of my teammates prefer to work on the frontend because they are not comfortable with the backend. I wanted to create a tool that would make backend development as easy as frontend development, so that it would be easier to organise the work in teams.
I think that Agrume is great to build prototypes and small projects. However, I don't know if it's a good idea to use it in production. I would love to hear your feedback on this!
### Installation
```bash
pnpm add agrume vite-plugin-agrume
```
> [!NOTE]
> Agrume is agnostic. This means that you can use it with the stack of your choice. However, for now we only provide a [Vite](https://vitejs.dev) plugin.
Now, you can add the plugin to your `vite.config.ts`:
```ts
import { defineConfig } from 'vite'
import { agrume } from 'vite-plugin-agrume'
export default defineConfig({
plugins: [
agrume()
// ...
]
})
```
> [!WARNING]
> In some cases, you need to add the plugin to the top of the list of plugins. For example, if you use [Vite React](https://www.npmjs.com/package/@vitejs/plugin-react), the Vite React plugin will add side-effect statements to your code, which will break Agrume. To work around this problem, you can also use the `createRoute` function in separate files.
> [!NOTE]
> If you want to make Agrume work with another stack, you may want to use the [babel plugin](https://github.com/arthur-fontaine/agrume/tree/main/packages/babel-plugin-agrume). Feel free to open a PR to add support for your stack!
## Configuration
Agrume is designed to be as simple as possible. It doesn't need any configuration to work. However, you can configure it to suit your needs.
#### `prefix`
By default, Agrume will prefix all your routes with `/api`. You can change this prefix by passing the `prefix` option to the plugin:
```ts
// ...
export default defineConfig({
plugins: [
agrume({
prefix: '/my-api'
})
// ...
]
})
```
#### `useMiddleware`
By default, Agrume will use the [Vite dev server](https://vitejs.dev/guide/api-javascript.html#devserver) to serve your API. However, you can use your own server by passing the `useMiddleware` option to the plugin:
```ts
// ...
import { server } from './server'
export default defineConfig({
plugins: [
agrume({
useMiddleware: server.use.bind(server),
})
// ...
]
})
```
The `useMiddleware` option takes a function that takes a Connect-like middleware as an argument. Here is an example of a Connect-like server:
```ts
import { createServer } from "node:http"
import connect from "connect"
const app = connect()
const server = createServer(app)
server.listen(3000)
export { app as server }
```
Many backend frameworks can use Connect-like middleware. For example, [Express](https://expressjs.com) can use Connect-like middleware. You can use it as a server:
```ts
import express from 'express'
const app = express()
const server = app.listen(3000)
export { app as server }
```
*But please, don't use Express. See ["Why you should drop ExpressJS" by Romain Lanz](https://web.archive.org/web/20220206190522/https://dev.to/romainlanz/why-you-should-drop-expressjs-in-2021-711)*.
#### `logger`
By default, Agrume does not log anything. However, you can pass a logger to the plugin to log the requests:
```ts
// ...
export default defineConfig({
plugins: [
agrume({
logger: {
info: console.info,
error: console.error,
}
})
// ...
]
})
```
You can use `fs.writeFileSync` instead of `console.log` to log the requests to a file.
```ts
// ...
export default defineConfig({
plugins: [
agrume({
logger: {
info: (...args) => fs.writeFileSync('info.log', args.join(' ') + '\n', { flag: 'a' }),
error: (...args) => fs.writeFileSync('error.log', args.join(' ') + '\n', { flag: 'a' }),
}
})
// ...
]
})
```
## Creating routes
The only thing you need to create a route is the `createRoute` function. It takes a function as an argument and returns a function that can be called to do a request to the route.
```ts
import { createRoute } from 'agrume'
const sayHello = createRoute(
async () => {
return 'Hello world!'
},
)
```
> [!NOTE]
> `sayHello` will be typed as `() => Promise<string>`.
You can then use the `sayHello` function to do a request to the route:
```ts
sayHello().then(console.log) // Hello world!
```
> [!WARNING]
> At the moment you can only use the `createRoute` function in `.js`, `.jsx`, `.ts` and `.tsx` files. To use Agrume in other files, you need to export the `createRoute` function from one of the valid files and import it into the other files. (See [Vue example](./examples/vue-example))
### Parameters
You can request parameters from the client just like you would do with a normal function:
```ts
import { createRoute } from 'agrume'
const sayHello = createRoute(
async (name: string) => {
return `Hello ${name}!`
},
)
```
You can then use the `sayHello` function to do a request to the route:
```ts
sayHello('Arthur').then(console.log) // Hello Arthur!
```
> [!NOTE]
> Agrume is type-safe so if you don't pass the correct parameters to the function, your IDE will warn you!
> [!NOTE]
> Agrume will pass the parameters to the server as body parameters so every request will be a `POST` request.
### Options
You can configure each route individually by passing an object to the `createRoute` function.
#### `path`
You can specify the path of the route by passing a string starting with `/` to the `path` option:
```ts
import { createRoute } from 'agrume'
const getDogImage = createRoute(
async () => {}, {
path: '/dog'
},
)
```
#### `getClient`
By default, Agrume will transform the `createRoute` function into a function that can be called to do a request to the route. The default client will use the `fetch` API to do the request. However, you can specify your own client by passing a function to the `getClient` option.
For example, if you want use a custom server that listen on port `3000`, you can do:
```ts
import { createRoute } from 'agrume'
const getDogImage = createRoute(
async () => {},
{
getClient(requestOptions) {
return async (parameters) => {
const response = await fetch(
`http://localhost:3000${requestOptions.url}`,
{
...requestOptions,
body: JSON.stringify(parameters)
}
)
return response.json()
}
}
},
)
```
> [!NOTE]
> The `parameters` argument cannot be inferred by TypeScript, so it will be typed as `any`. You can type it yourself, but it must be the same type as the parameters of the route.
> [!IMPORTANT]
> `getClient` will affect the type of the route. For example, if your `getClient` function returns the `requestOptions`, the type of the route will be `() => Promise<RequestOptions>`.
Have a look at the [Recipes](#recipes) section to see what you can do with the `getClient` option.
## Recipes
### Authentication
You can use the `getClient` option to add authentication to your routes. For example, if you want to add a JWT authentication to your routes, you can do:
```ts
import { createRoute } from 'agrume'
const getUser = ({ token }) => {
// ...
}
const getAgrumeClient = (requestOptions) => {
return async (parameters) => {
const token = localStorage.getItem('token')
const response = await fetch(
`http://localhost:3000${requestOptions.url}`,
{
...requestOptions,
body: JSON.stringify({
...parameters,
token
})
}
)
return response.json()
}
}
const authenticatedRoute = createRoute(
async (parameters) => {
const user = await getUser(parameters)
return user
},
{
getClient: getAgrumeClient
},
)
```
### Other examples
You can find examples in the [examples](./examples) directory.
- [Vue example](./examples/vue-example)
- [React example](./examples/react-example)
- [Prisma (with React) example](./examples/react-prisma-example)
## License
[MIT © Arthur Fontaine](./LICENSE)
| API development made for front-end developers! Easy, customizable and type-safe. | api,backend,frontend,typescript,vite,javascript | 2023-08-18T15:52:31Z | 2024-04-22T21:28:21Z | 2023-08-28T15:57:11Z | 1 | 42 | 130 | 0 | 0 | 7 | null | MIT | TypeScript |
RightCapitalHQ/frontend-style-guide | main | # RightCapital Frontend Style Guide
<!-- Badges area start -->
[](https://rightcapital.com)
[](https://conventionalcommits.org)
[](https://github.com/RightCapitalHQ/frontend-style-guide)
<!-- Badges area end -->
RightCapital's frontend style guide.
## Introduction
This repo contains configs for common linting and styling tools widely used in RightCapital.
Following tools are covered:
- [ESLint](#eslint)
- [Prettier](#prettier)
## ESLint
This repo provides the following ESLint config packages:
- `@rightcapital/eslint-config-javascript`: for JavaScript files
- `@rightcapital/eslint-config-typescript`: for TypeScript files
- `@rightcapital/eslint-config-typescript-react`: for TypeScript + React files
- `@rightcapital/eslint-plugin`
They can be used independently or combined together according to your project's needs.
### Usage
> [!NOTE]
> make sure `eslint` is installed in your project.
>
> And install `typescript` to your project if you want to use the config supporting TypeScript(`@rightcapital/eslint-config-typescript*`).
Install the config package(s) you need:
```sh
# e.g. for a project only using JavaScript
pnpm add -D @rightcapital/eslint-config-javascript
```
In your `.eslintrc.cjs`([or equivalent](https://eslint.org/docs/latest/use/configure/configuration-files#configuration-file-formats)):
1. [using `overrides` to group different types of files](https://eslint.org/docs/latest/use/configure/configuration-files#configuration-based-on-glob-patterns), and extends the corresponding config.
2. Add proper `env` and other configs if needed.
```js .eslintrc.cjs
/** @type {import("eslint").Linter.Config} */
module.exports = {
// use overrides to group different types of files
// see https://eslint.org/docs/latest/use/configure/configuration-files#configuration-based-on-glob-patterns
overrides: [
{
// typical TypeScript React code, running in browser
files: ['src/**/*.{ts,tsx}'],
excludedFiles: ['src/**/*.test.{ts,tsx}'], // exclude test files
extends: ['@rightcapital/typescript-react'],
env: { browser: true },
},
],
};
```
> [!NOTE]
> Applying same config to all files in the project could be error-prone. Not recommended.
#### Complete Showcase
<details>
<summary>
For example, we have a project with the following structure:
</summary>
```
.
├── .eslintrc.cjs
├── jest.config.cjs
├── prettier.config.cjs
├── scripts <---------------- Various scripts running in Node.js
│ ├── brew-coffee.ts
│ ├── make-latte.mjs
│ └── print-project-stats.tsx
└── src
├── App.test.ts <------------ Jest test file
└── App.tsx <------------ TypeScript React component
```
The `.eslintrc.cjs` could look like this:
```js
/** @type {import("eslint").Linter.Config} */
module.exports = {
// usually `true` for project root config
// see https://eslint.org/docs/latest/use/configure/configuration-files#cascading-and-hierarchy
root: true,
// use overrides to group different types of files
// see https://eslint.org/docs/latest/use/configure/configuration-files#configuration-based-on-glob-patterns
overrides: [
{
// typical TypeScript React code, running in browser
files: ['src/**/*.{ts,tsx}'],
excludedFiles: ['src/**/*.test.{ts,tsx}'], // exclude test files
extends: ['@rightcapital/typescript-react'],
env: { browser: true },
},
{
// test files
files: ['src/**/*.test.{ts,tsx}'],
extends: ['@rightcapital/typescript-react'],
env: { jest: true, node: true },
},
{
// JavaScript config and scripts
files: ['./*.{js,cjs,mjs,jsx}', 'scripts/**/*.{js,cjs,mjs,jsx}'],
excludedFiles: ['src/**'],
extends: ['@rightcapital/javascript'],
env: { node: true },
},
{
// TypeScript config and scripts
files: ['./*.{ts,cts,mts,tsx}', 'scripts/**/*.{ts,cts,mts,tsx}'],
excludedFiles: ['src/**'],
env: { node: true },
},
],
};
```
</details>
## Prettier
### Usage
> Note: Prettier is a peer dependency of the config package. You need to install it in the root of your project.
>
> See: https://prettier.io/docs/en/install.html
Install config package to your project:
```bash
pnpm add -D @rightcapital/prettier-config
```
In your project's `prettier.config.cjs`:
```js
module.exports = require('@rightcapital/prettier-config');
```
## License
[MIT License](LICENSE) © 2023-Present
| RightCapital's frontend style guide. | eslint,eslint-config,eslint-rules,javascript,prettier,styleguide,typescript,rightcapital | 2023-08-22T01:54:26Z | 2024-05-23T05:05:37Z | 2024-04-25T05:29:31Z | 13 | 119 | 333 | 9 | 0 | 7 | null | MIT | JavaScript |
GhostEsso/bookstore-react | dev | <a name="readme-top"></a>
<h3><b>Bookstore README Template</b></h3>
<!-- TABLE OF CONTENTS -->
# 📗 Table of Contents
- [📗 Table of Contents](#-table-of-contents)
- [📖 \[Bookstore\] ](#-bookstore-)
- [🛠 Built With ](#-built-with-)
- [Tech Stack ](#tech-stack-)
- [Key Features ](#key-features-)
- [🚀 Live Demo ](#-live-demo-)
- [💻 Getting Started ](#-getting-started-)
- [Prerequisites](#prerequisites)
- [Setup](#setup)
- [Install](#install)
- [Run test](#run-test)
- [Run App](#run-app)
- [👥 Authors ](#-authors-)
- [🔭 Future Features ](#-future-features-)
- [🤝 Contributing ](#-contributing-)
- [⭐️ Show your support ](#️-show-your-support-)
- [🙏 Acknowledgments ](#-acknowledgments-)
- [📝 License ](#-license-)
<!-- PROJECT DESCRIPTION -->
# 📖 [Bookstore] <a name="about-project"></a>
The **Bookstore React App** presents an immersive single-page experience, designed for book enthusiasts seeking an interactive platform to explore and purchase their favorite reads. This application harnesses the power of the React JavaScript library, offering an intuitive and seamless browsing journey.
Key components of the app include a dynamic navbar and footer, meticulously designed for easy navigation across the app's various sections. User engagement is enhanced through registration and login features, allowing users to seamlessly manage their accounts. The app also empowers users to curate their personal reading lists by adding or removing books from their shopping cart.
A robust search functionality empowers users to find books by title, author, or genre. The app showcases an up-to-date inventory of available books, complemented by individual book pages that provide comprehensive information such as book descriptions, reviews, and pricing details.
Notably, the app ensures a holistic experience by featuring an order history page, enabling users to review their past purchases. Built with a combination of React, JSX, CSS, and JavaScript, the app stands as a testament to the capabilities of these technologies in crafting engaging web applications.
Currently hosted on Render, the live demo offers a firsthand experience of the app's features and functionalities. While the app continues to evolve, it serves as a prime example of how React can be harnessed to create dynamic and interactive web interfaces.
Future enhancements for the app may include advanced filtering options based on genre, price, and other criteria, the introduction of a wishlist feature, the ability for users to provide ratings and reviews for books, email subscription notifications for new book releases, multi-currency support for purchasing, and even multilingual support for broader accessibility and reach. The Bookstore React App showcases the possibilities of a well-executed React project, promising a seamless journey for all book enthusiasts.
## 🛠 Built With <a name="built-with"></a>
### Tech Stack <a name="tech-stack"></a>
<details>
<summary>React</summary>
</details>
<details>
<summary>JSX</summary>
</details>
<details>
<summary>CSS</summary>
</details>
<details>
<summary>ES6</summary>
</details>
<details>
<summary>VS Code</summary>
</details>
<details>
<summary>API</summary>
</details>
<details>
<summary>Eslint</summary>
</details>
<details>
<summary>Stylelint</summary>
</details>
<!-- Features -->
### Key Features <a name="key-features"></a>
- **A navbar and footer that provide navigation throughout the app.**
- **A register and login form for users to create and manage their accounts.**
- **A shopping cart where users can add and remove books.**
- **A search bar that allows users to find books by title, author, or genre.**
- **A list of books that are currently in stock.**
- **A page for each book where users can view more information, such as the book's description, reviews, and price.**
- **An order history page where users can view their past orders.**
<p align="right">(<a href="#readme-top">back to top</a>)</p>
To get a local copy up and running, follow these steps.
## 🚀 Live Demo <a name="live-demo"></a>
[https://book-jjbt.onrender.com/]
<p align="right">(<a href="#readme-top">back to top</a>)</p>
<!-- GETTING STARTED -->
## 💻 Getting Started <a name="getting-started"></a>
To get a local copy up and running, follow these steps.
### Prerequisites
In order to run this project you need:
-Commands: npm install
### Setup
* git clone git@github.com:GhostEsso/bookstore-react.git
* cd bookstore-react
* git checkout components
### Install
-Command: npm install
### Run test
-Command: npm test
### Run App
-Command: npm start
<p align="right">(<a href="#readme-top">back to top</a>)</p>
<!-- AUTHORS -->
## 👥 Authors <a name="authors"></a>
👤 **Essohanam TAMBANA**
- GitHub: [@GhostEsso](https://github.com/GhostEsso)
- Twitter: [@TambanaEssohanam](https://twitter.com/TambanaEssohana)
- LinkedIn: [@TambanaEssohanam](https://www.linkedin.com/in/essohanam-tambana-62aa081a1/)
-
<!-- FUTURE FEATURES -->
## 🔭 Future Features <a name="future-features"></a>
- **User Authentication and Authorization: Enabling user account creation, sign-in, and sign-out functionalities ensures personalized experiences, granting users exclusive access to their own book collections and settings.**
- **Efficient Shopping Cart: The integration of a user-friendly shopping cart mechanism empowers users to effortlessly add their desired books, subsequently proceeding to a seamless checkout process.**
- **Secure Payment Processing: Incorporating robust payment processing capabilities assures users a safe and convenient way to finalize their purchases, utilizing credit cards or various payment methods.**
- **Streamlined Shipping and Delivery: Enabling tracking features for order status and facilitating smooth shipping and delivery procedures ensures customers receive their ordered books in a timely and transparent manner.**
- **Engaging Reviews and Ratings: Allowing users to express their opinions through reviews and ratings enriches the app's content and aids fellow readers in making informed selections.**
- **Wishlist Functionality: Providing users with the option to assemble a wishlist enables them to earmark books they intend to purchase in the future, fostering a personalized and organized reading experience.**
- **Tailored Personalization: Customizing the app to each user's preferences, such as favorite genres or authors, enhances user satisfaction by tailoring content to their unique tastes.**
- **Vibrant Social Features: Implementing social interactions permits users to forge connections, share book recommendations, and engage in insightful discussions, thereby fostering a vibrant reading community.**
These visionary concepts are merely a glimpse into the future of the Bookstore React app. The inclusion of these enhancements is guided by user needs and desires, ensuring that the app evolves into a dynamic and user-centric platform that caters to the diverse preferences of its audience.
<p align="right">(<a href="#readme-top">back to top</a>)</p>
<!-- CONTRIBUTING -->
## 🤝 Contributing <a name="contributing"></a>
Contributions, issues, and feature requests are welcome!
<p align="right">(<a href="#readme-top">back to top</a>)</p>
<!-- SUPPORT -->
## ⭐️ Show your support <a name="support"></a>
If you like my Todo statup project kindly comment or Follow me on LinkedIn, Twitter & twitter and always Your feedback will be really appreciated I have created issue if you want to share.
Thanks.
<p align="right">(<a href="#readme-top">back to top</a>)</p>
<!-- ACKNOWLEDGEMENTS -->
## 🙏 Acknowledgments <a name="acknowledgements"></a>
I would like to thank you All Microverse community.
<p align="right">(<a href="#readme-top">back to top</a>)</p>
<!-- LICENSE -->
## 📝 License <a name="license"></a>
This project is [MIT](/MIT.md) licensed.
<p align="right">(<a href="#readme-top">back to top</a>)</p> | The Single-Page React App for the Bookstore enables users to explore and buy books. Constructed using the React JavaScript library, the application boasts a navigation bar and a footer that facilitate seamless navigation across the entire app. | javascript,react,api | 2023-08-17T10:47:03Z | 2023-08-26T13:30:46Z | null | 1 | 5 | 41 | 0 | 0 | 7 | null | null | JavaScript |
teamkooestscholar/003JS-reverse-a-string | main | # EASY: 003 JS - Reverse A String
## Description
Write a JavaScript function that takes a string as an input and returns the reverse of that string.
## Sample solution
```javascript
function reverseString(inputString) {
return inputString.split('').reverse().join('');
}
```
## Bonus Challenges
* Modify the function to handle special characters or whitespace gracefully. (Hint: You may need to look into regular expressions.) **[+5 extra credit points]**
* Write a version of the function that doesn't use the split, reverse, or join methods. (Hint: You'll need to use a loop.) **[+5 extra credit points]**
* Create a web page that allows users to input a string and see the reversed result interactively. (Hint: You'll need to use HTML and JavaScript.) **[+5 extra credit points]**
## How to answer?
* Kindly go to `src` directory and edit `solution.js` file.
* Replace the `commented code` with your solution.
| Write a JavaScript function that takes a string as an input and returns the reverse of that string. | easy,javascript,assessment | 2023-09-07T13:38:58Z | 2023-09-09T21:30:42Z | null | 1 | 3 | 5 | 0 | 2 | 6 | null | Unlicense | HTML |
DARK-DEVIL-BOTZ/DDev-BOT-OLD | main | <p align="center">
<a href="https://github.com/DARK-DEVIL-BOTZ/DDev-BOT">
<img src="https://graph.org/file/86a4ac302b0d571057a40.jpg" width="800">
</p>
<h1 align="center">🤖 DDEV BOT 🤖</h1>
<p align="center">
👋 𝘐 𝘈𝘔 𝘋𝘋𝘌𝘝 𝘉𝘖𝘛. 𝘈 𝘞𝘏𝘈𝘛𝘚𝘈𝘗𝘗 𝘉𝘖𝘛 𝘊𝘙𝘌𝘈𝘛𝘌𝘋 𝘉𝘠 𝘋𝘈𝘙𝘒 𝘋𝘌𝘝𝘐𝘓 𝘉𝘖𝘛𝘡 𝘛𝘖 𝘋𝘖 𝘌𝘝𝘌𝘙𝘠𝘛𝘏𝘐𝘕𝘎 𝘛𝘏𝘈𝘛 𝘐𝘚 𝘗𝘖𝘚𝘚𝘐𝘉𝘓𝘌 𝘖𝘕 𝘞𝘏𝘈𝘛𝘚𝘈𝘗𝘗 𝘉𝘈𝘚𝘌𝘋 𝘖𝘕 𝘞𝘏𝘈𝘛𝘚𝘈𝘗𝘗 𝘔𝘜𝘓𝘛𝘐 𝘋𝘌𝘝𝘐𝘊𝘌(𝘔𝘋) 𝘚𝘜𝘗𝘗𝘖𝘙𝘛.✌️
<p align="center">
<a href="https://github.com/DARK-DEVIL-BOTZ/DDev-BOT/stargazers">
<img src="https://img.shields.io/github/stars/DARK-DEVIL-BOTZ/DDev-BOT?style=social">
<p align="center">
<a href="https://github.com/DARK-DEVIL-BOTZ/DDev-BOT/fork">
<img src="https://img.shields.io/github/forks/DARK-DEVIL-BOTZ/DDev-BOT?label=Fork&style=social">
<p align="center">
<a href="https://github.com/DARK-DEVIL-BOTZ/DDev-BOT">
<img src="https://api.visitorbadge.io/api/visitors?path=DARK-DEVIL-BOTZ%2FDDev-BOT&label=Repo%20Visitors&labelColor=%23697689&countColor=%23ba68c8&style=plastic&labelStyle=upper">
<p align="CENTER">
<a href="https://github.com/DARK-DEVIL-BOTZ"><img title="Support" src="https://img.shields.io/badge/Maintain-NO!-cyan.svg?style=for-the-badge&logo=xcode" /></a>
</p>
<p align="CENTER">
<a href="https://github.com/DARK-DEVIL-BOTZ"><img title="Support" src="https://img.shields.io/badge/next%20Update-NOT_YET!-green.svg?style=for-the-badge&logo=xcode" /></a>
</p>
<br>
<br>
<h2 align="center"> 🍴 TAP HERE TO FORK 🍴
</h2>
<h2 align="center"> <a href="https://github.com/DARK-DEVIL-BOTZ/DDev-BOT/fork"><img src="https://img.shields.io/badge/FORK DDEV BOT-h?color=white&style=for-the-badge&logo=stackshare" />
</a>
</h2>
<br>
<br>
<h2 align="center"> 🔥 RUN REPL FOR GET MULTI SESSION QR 🔥 </h2>
<h2 align="center"> <a href="https://replit.com/@DARK-DEVIL-BOTZ/DDEV-SESSION?v=1"><img src="https://repl.it/badge/github/quiec/whatsasena" />
</a>
</h2>
##
- After you getting the `creds.json ` then upload the `creds.json` in the `DDev-BOT` folder. then you can deploy on your favourite platform.
<h2 align="center"> 💲 DEPLOY ON HEROKU 💲
</h2>
<p align="center" >
<a href="https://heroku.com/deploy?template=https://github.com/DARK-DEVIL-BOTZ/DDev-BOT">
<img title="DDEV ON HEROKU" src="https://www.herokucdn.com/deploy/button.png" width="189px" alt="Deploy on Heroku" >
</a>
</p>
</br>
<h2 align="center"> Add This 2 BuildPacks On Heroku If Heroku Show Some Error In Deploy.
</h2>
```
https://github.com/jonathanong/heroku-buildpack-ffmpeg-latest
```
```
https://github.com/clhuang/heroku-buildpack-webp-binaries.git
```
<br>
</br>
<h2 align="center"> 🕑 DEPLOY ON CODESPACE 🕑
</h2>
<h2 align="center"> <a href="https://github.com/codespaces/new"><img title="DDEV on Gitub Codespace" src="https://img.shields.io/badge/DEPLOY CODESPACE-h?color=black&style=for-the-badge&logo=visualstudiocode" />
</a>
</h2>
<br>
</br>
<h2 align="center"> 😣 DEPLOY ON MOGENIUS 😒
</h2>
<h2 align="center"> <a href="https://studio.mogenius.com/studio/cloud-space/cloud-space-overview"><img title="DDEV on Mogenius" src="https://img.shields.io/badge/DEPLOY MOGENIUS-h?color=blue&style=for-the-badge&logo=genius"></a>
</a>
</h2>
<br>
</br>
<h2 align="center"> 💰 DEPLOY ON RAILWAY 💰
</h2>
<h2 align="center"> <a href="https://railway.app/new"><img title="DDEV on Railway"src="https://railway.app/button.svg" />
</a>
</h2>
<br>
</br>
<br>
<br>
<br>
<br>
- Termux
```js
termux-setup-storage
```
```
apt update
```
```
apt upgrade
```
```
pkg update && pkg upgrade
```
```
pkg install bash
```
```
pkg install libwebp
```
```
pkg install git -y
```
```
pkg install nodejs -y
```
```
pkg install ffmpeg -y
```
```
pkg install wget
```
```
pkg install imagemagick -y
```
```
git clone https://github.com/DARK-DEVIL-BOTZ/DDev-BOT.git
```
```
cd DDev-BOT
```
```
npm i
```
```
npm start
```
- Command For 24/7
```js
npm i -g forever && forever index.js && forever save && forever logs
```
</br> <br>
<h2 align="center"> 🛡️ WINDOWS AND VS CODE CMDS 🛡️
</h2>
* [`Download ffmpeg`](https://ffmpeg.org/download.html#build-windows) and set path
* [`Download wget`](https://eternallybored.org/misc/wget/releases/) and set path
* [`Download Node JS`](https://nodejs.org/en/download/)
* [`Download Git`](https://git-scm.com/downloads)
* [`Download Libwebp`](https://developers.google.com/speed/webp/download)
```cmd
> git clone https://github.com/DARK-DEVIL-BOTZ/DDev-BOT.git
```
```
> cd DDev-BOT
```
```
> npm i
```
```
> npm start
```
- Command For 24/7
```js
npm i -g forever && forever index.js && forever save && forever logs
```
| ɪ ᴀᴍ ᴅᴅᴇᴠ ʙᴏᴛ. ᴀ ᴡʜᴀᴛsᴀᴘᴘ ʙᴏᴛ ᴄʀᴇᴀᴛᴇᴅ ʙʏ ᴅᴀʀᴋ ᴅᴇᴠɪʟ ʙᴏᴛᴢ ᴛᴏ ᴅᴏ ᴇᴠᴇʀʏᴛʜɪɴɢ ᴛʜᴀᴛ ɪs ᴘᴏssɪʙʟᴇ ᴏɴ ᴡʜᴀᴛsᴀᴘᴘ ʙᴀsᴇᴅ ᴏɴ ᴡʜᴀᴛsᴀᴘᴘ ᴍᴜʟᴛɪ ᴅᴇᴠɪᴄᴇ(ᴍᴅ) sᴜᴘᴘᴏʀᴛ | dark-devil,javascript,whatsapp-bot,ddev-bot,private-edition | 2023-08-28T10:18:41Z | 2023-11-13T16:56:20Z | null | 1 | 2 | 217 | 0 | 13 | 6 | null | GPL-3.0 | JavaScript |
ReqEase/ReqEase | main | # ReqEase: Simplify Front-End Development
ReqEase is a versatile front-end library designed to streamline web development tasks. It empowers developers to create interactive and dynamic web forms effortlessly while offering customization options to tailor the user experience.
## Key Features
**Form Handling:** ReqEase simplifies the creation and validation of HTML forms. With minimal setup, you can build forms that adapt to your needs.
**Validation:** Implement robust form validation with ease. ReqEase provides a range of built-in validators and allows you to define custom validation logic.
**AJAX Requests:** Seamlessly handle AJAX requests and responses. ReqEase helps you manage data submission and retrieval, making your web applications more responsive.
**Customization:** Customize the look and behavior of your forms and messages. ReqEase's flexibility allows you to design forms that match your application's style.
**Integrations:** ReqEase is not just a standalone library; it can be used alongside backend libraries that share the same principles. This enables you to create end-to-end solutions efficiently.
## Quick Start
Getting started with ReqEase is easy:
1. **Installation:** Include the ReqEase library in your project. You can use package managers like npm or simply include it via a CDN.
2. **Configuration:** Define your forms and their validation rules using ReqEase's intuitive API.
3. **Enhance Forms:** Apply ReqEase to your HTML forms and buttons to enable interactive features and validation.
4. **Customize:** Tailor the user experience by customizing validation messages, input rendering, and more.
Explore the [Documentation](https://hichemtech.gitbook.io/reqease-docs/quick-start) for in-depth guides and examples.
## Demo
Here's a demo of ReqEase in action:
- [Demo](https://reqease.github.io/ReqEase/)
## Contribution
ReqEase is an open-source project, and we welcome contributions from the community. Whether you're interested in fixing bugs, adding features, or improving documentation, your input is valuable.
- View the [Contribution Guidelines](https://hichemtech.gitbook.io/reqease-docs/community/contributing-to-reqease).
- Check out the [Issues](https://github.com/ReqEase/ReqEase/issues/new/choose) to find tasks you can help with.
## Support and Feedback
If you have questions, encounter issues, or want to share your feedback, please open an issue. We're here to assist you in making the most of ReqEase.
ReqEase is designed to make your front-end development experience smoother and more efficient. Give it a try and see how it can simplify your web development workflow.
| ReqEase redefines web development. Our JavaScript library simplifies HTTP requests with validation, loading indicators, and response handling. Customize effortlessly, integrate seamlessly, and elevate your experience. Compatible with Laravel, PHP, and more. ReqEase: Unleash your web potential. | form,form-validation,forms,handlers,http-requests,javascript,javascript-library,jquery,jquery-library,jquery-plugin | 2023-09-01T19:42:33Z | 2023-09-11T15:14:08Z | 2023-09-11T15:14:08Z | 1 | 2 | 57 | 0 | 0 | 6 | null | MIT | TypeScript |
qaidjoharj53/Blood-Bridge | main | # Blood Bridge: Bridging the Gap for Blood Donation
### 📺 [Check out our Video Demo](https://www.youtube.com/watch?v=3VZnSMy5QFg)
### About Blood Bridge
Blood Bridge is not just a website; it's a lifeline for those in need. Our full-stack website project simplifies the process of blood donation, making it accessible to everyone. With its responsive design and user-friendly interface, Blood Bridge empowers donors and recipients alike.
# Blood Bridge Setup Guide
Ready to set up Blood Bridge on your computer? Follow these steps to get it up and running smoothly.
You can set it up using locally, or using Docker.
## XAMPP
### Prerequisites
Before you begin, make sure you have the following prerequisites:
1. Head over to the [Blood Bridge GitHub repository](https://github.com/qaidjoharj53/Blood-Bridge).
2. Click on the "Code" button and select "Download ZIP" to get the source code as a ZIP archive.
### Step 1: Download and Install XAMPP
1. Download XAMPP for your operating system (Windows, macOS, or Linux) from the [official website](https://www.apachefriends.org/index.html).
2. Run the installer and follow the on-screen instructions. The default settings should suffice, but feel free to customize as needed.
### Step 2: Start XAMPP Control Panel
1. After installation, launch the XAMPP Control Panel.
- On Windows, find it in the Start menu.
- On macOS, locate it in the Applications folder.
- On Linux, use the `sudo /opt/lampp/manager-linux-x64.run` command in your terminal.
2. In the XAMPP Control Panel, initiate the Apache and MySQL services by clicking "Start" for each.
### Step 3: Configure Your Website
1. Place your files from the `code`-folder in the appropriate directory. On Windows, it's `C:\xampp\htdocs` by default. On macOS and Linux, you'll find it at `/opt/lampp/htdocs`.
2. Ensure that your main webpage is named either `index.php` or `index.html` and is inside the `htdocs` folder. This will be the page displayed when you visit `http://localhost` in your web browser.
### Step 4: Access Your Website
1. Open your preferred web browser (e.g., Chrome, Firefox, or Edge).
2. Type `http://localhost` into the address bar and hit Enter. This will load your Blood Bridge website, the default webpage.
Congratulations! You've successfully set up and opened Blood Bridge on your computer or PC using XAMPP.
## Docker
The modern alternative is using Docker. You'll only need [docker](https://docs.docker.com/engine/install/) and docker-compose.
You'll only need to run the `docker compose up -d` command from your terminal to run the website.
It will be accessible under http://localhost afterwards.
You can stop the containers again using `docker compose down --remove-orphans`
## Badges of Honor
[](https://codeclimate.com/github/qaidjoharj53/Blood-Bridge)
## Additional Notes
- Don't forget to stop the Apache and MySQL services. Simply return to the XAMPP Control Panel and click "Stop" for each service.
- Ensure the security of your XAMPP installation and website before deploying them to a live server.
- If you encounter any issues, consult the XAMPP documentation or seek assistance from online forums and communities.
## Thanks to the contributors!
<a href="https://github.com/qaidjoharj53/Blood-Bridge/graphs/contributors">
<img src="https://contrib.rocks/image?repo=qaidjoharj53/Blood-Bridge" />
</a>
---
<p align="right">(<a href="#top">Back to top</a>)</p>
| Blood Donations Website | html-css-javascript,php,hacktoberfest,javascript | 2023-09-01T16:38:43Z | 2023-10-30T13:53:56Z | null | 10 | 11 | 33 | 0 | 6 | 6 | null | MIT | HTML |
AtharvaKulkarniIT/Rock-Paper-Scissor | main | # Rock, Paper, Scissors Game
This is a Rock, Paper, Scissors game built with HTML, CSS, and JavaScript. You can play this classic hand game against the computer. The game is fully responsive and can be played on both desktop and mobile devices.
## Features
- Play Rock, Paper, Scissors against the computer.
- Simple and intuitive user interface.
- Responsive design for both desktop and mobile devices.
- Tracks your wins, losses, and ties.
## How to Play
1. Choose your move: Rock, Paper, or Scissors by clicking on the respective button.
2. The computer will randomly select its move.
3. The winner of the round will be displayed on the screen.
4. Keep playing and try to beat the computer!
## Installation
To run the game locally, follow these steps:
1. Clone this repository to your local machine using Git:
```bash
git clone https://github.com/AtharvaKulkarniIT/Rock-Paper-Scissor.git
That's it! You don't need to install any additional dependencies.
## Usage
Simply open the `index.html` file in your web browser. You can start playing the game immediately.
## Contributing
Contributions are welcome! If you want to contribute to this project, follow these steps:
1. Fork the repository.
2. Create a new branch for your feature or bug fix: `git checkout -b feature/your-feature`.
3. Make your changes and commit them: `git commit -m 'Add a new feature'`.
4. Push to the branch: `git push origin feature/your-feature`.
5. Create a pull request.
Please ensure your pull request is in line with the project's coding style and standards.
## License
This project is licensed under the MIT License - see the [LICENSE](LICENSE) file for details.
| This repository hosts a dynamic Rock, Paper, Scissors game crafted using HTML, CSS and JavaScript. Engage in an exhilarating match against a computer adversary for an electrifying gaming experience! | game-development,javascript,rock-paper-scissors,webgame,rock-paper-scissor,rock-paper-scissors-game,responsive,rock-paper-scissors-responsive | 2023-08-27T11:16:34Z | 2023-11-25T18:46:45Z | null | 1 | 0 | 17 | 0 | 0 | 6 | null | MIT | JavaScript |
isaac545454/react-utils | main | >## <font color="red">[GET] </font> listagens de temas e tipos (select)
response
```json
{
"owner": {
"name": "string",
"id": "string"
},
"farm": {
"name": "string",
"id": "string"
}
}
```
> ## 📁 arquitetura do projeto
```shell
src/
|-- domain/
| |-- user/
| |-- task/
|-- infra/
| |-- api/
|-- data/
| |--
|-- presentation/
| |-- pages/
| |-- templates/
| |-- components/
| | |-- atoms/
| | |-- molecules/
| | |-- organisms/
```
>## 📚 Documentação
| Categoria | Ferramenta de Documentação |
|---------------------|-----------------------------|
| Componentes | Storybook |
| Hooks e Classes | jsDocs |
| Utilitários | Markdown |
> ## 📄 Sumário
- [`createHttp()`](https://www.linkedin.com/feed/update/urn:li:activity:7107698003984941059/)
- [`useHttpQuery()`](https://www.linkedin.com/posts/isaac545454_useget-activity-7099364195527196672-21oh?utm_source=share&utm_medium=member_desktop)
- [`useHttpMutation()`](https://www.linkedin.com/posts/isaac545454_useget-activity-7099364195527196672-21oh?utm_source=share&utm_medium=member_desktop)
- [`Composition`](https://www.linkedin.com/posts/isaac545454_pare-de-criar-componentes-que-dependem-de-activity-7104436766790549504-zzLp?utm_source=share&utm_medium=member_desktop)
- [`patterns Adapter`](https://www.linkedin.com/feed/update/urn:li:activity:7114582559736410112/)
- [`uncontrolled vs controlled`](https://www.linkedin.com/posts/isaac545454_uncontrolled-components-vs-controlled-components-activity-7115671105025028096-ke60?utm_source=share&utm_medium=member_desktop)
- [`DOM vs virtual DOM`](https://www.linkedin.com/feed/update/urn:li:activity:7119657569488412672/)
- [`git-flow`](https://www.linkedin.com/feed/update/urn:li:activity:7120022552499879937/)
- [`IndexedDB`](https://www.linkedin.com/feed/update/urn:li:activity:7121106732507893760/)
- [`methods array`](https://www.linkedin.com/feed/update/urn:li:activity:7122193771517112320/)
- [`key do react`](https://www.linkedin.com/posts/isaac545454_para-que-serve-a-key-em-react-pq-n%C3%A3o-devemos-activity-7120744467338342400-gs9V?utm_source=share&utm_medium=member_desktop)
- [`memorizar componente`](https://www.linkedin.com/feed/update/urn:li:activity:7122918453321117697/)
>## 🌐 createHttp()
```js
//uso do createHttp
import { apiClient } from "@/infra/api";
import { createHttp } from "@/infra/http-client"; // Importe a classe e a função
// Crie uma instância de HttpService configurada para um tipo específico de resposta
const { http } = createHttp<MyResponseType>();
// Faça uma solicitação GET para um endpoint
const response = await http.exec({
endpoint: "/exemplo",
method: "GET",
params: { id: "1" },
});
```
>## 📡 useHttpQuery ()
```js
//uso do useHttpQuery
import { useHttpQuery } from '@/hooks/index';
import { endpoint } from '@/endpoint';
//parametros
-`queryKey` (QueryKey): Uma chave única que identifica a consulta ou recurso a ser buscado. Isso pode ser útil para cache ou invalidação de cache.
-`options` (UseQueryOptions): Opções adicionais para personalizar o comportamento do `useQuery` da biblioteca `react-query`.
-`HttpService` (HttpProps): Um objeto de configuração que define os detalhes da requisição HTTP GET.
-`endpoint` (string): O endpoint da API ou URL de onde os dados devem ser buscados.
-`headers` (object): Um objeto contendo cabeçalhos HTTP opcionais a serem enviados com a requisição.
-Outras opções relevantes para uma requisição HTTP GET, como `params`, `auth`, etc.
//exemplo de uso(obs: evitar usar string diretamente no endpoint)
const { data, isLoading, isError } = useHttpQuery <IResponsePost[]>({
queryKey: ['getPosts'],
HttpService: { endpoint: endpoint.getPosts },
options: {enabled: true}
});
```
>## 🔄 useHttpMutation()
```js
//uso do useHttpMutation
import { useHttpMutation } from '@/hooks/index';
import { endpoint } from '@/endpoint';
//parametros
- `options` (MutationOptions<TData, TError, TRequest>): Um objeto opcional contendo opções de configuração para a mutação. Essas opções são as mesmas que as fornecidas pelo `useMutation` do `react-query`. Elas permitem personalizar o comportamento da mutação, como manipulação de erros, atualização de cache, etc.
- `HttpService` (HttpProps): Um objeto que representa os dados da solicitação POST. Isso geralmente inclui o corpo da solicitação, cabeçalhos e outras informações relevantes para a solicitação.
//exemplo de uso(obs: evitar usar string diretamente no endpoint)
const { isLoading, isError, isSuccess, mutate } = useHttpMutation<TData, TError, TRequest>({
options: {
// Opções de configuração da mutação (opcional),
},
HttpService: {
endpoint: endpoint.createPost
},
});
const handleSubmit = () => {
mutate();
};
```
>## 🧩 Composition
```js
import { Input } from './Input';
function App() {
return (
<div>
<Input.Text />
<Input.Title>Título</Input.Title>
<Input.Mask mask="99/99/9999" />
<Input.Error>Error</Input.Error>
</div>
);
}
```
>## 🔌patterns Adapter
```js
const CookiesStorage = {
setItem: Cookies.set,
getItem: Cookies.get,
removeItem: Cookies.remove,
}
export const cookiesStorageFactory = () => useStorage(CookiesStorage)
```
>## 🎮 unControlled vs controlled
```js
const uncontrolled = useRef<HTMLInputElement>(null)
const [controlled, setControlled] = useState('')
<Input
name="uncontrolled"
ref={uncontrolled}
/>
<Input
name="controlled"
value={controlled}
onChange={e => setControlled(e.target.value)}
/>
```
| null | composition,factory,javascript,jest,poo,react,react-hooks,react-native,react-router,reactjs | 2023-08-19T13:26:51Z | 2024-04-05T20:30:50Z | null | 1 | 0 | 245 | 0 | 0 | 6 | null | null | TypeScript |
cijiugechu/nodejs-semver | main | # `nodejs-semver`
[](https://crates.io/crates/nodejs-semver)
[](https://docs.rs/nodejs-semver)
This crate is a pure Rust-based implementation of JavaScript's
[`node-semver`](https://npm.im/semver). That is, it's designed to be
compatible with Node/NPM's particular flavor of semver (which the [`semver`
crate](https://crates.io/crates/semver) is not).
It is designed for Rust programs and libraries meant for JavaScript tooling,
and does its best to stay compatible with `node-semver`.
> This project has been forked from [node-semver](https://github.com/felipesere/node-semver-rs) since September of 2023, but a lot has changed; For more details, see [Changelog](https://github.com/cijiugechu/nodejs-semver/blob/main/CHANGELOG.md).
## Usage
`nodejs-semver` includes two main types: [Version] and [Range]. See [the
documentation](https://docs.rs/nodejs-semver) for more details.:
```rust
use nodejs_semver::{Range, Version};
let version: Version = "1.2.3".parse().unwrap();
let range: Range = "^1.2".parse().unwrap();
assert!(version.satisfies(&range));
```
## Optional Features
The following are a list of [Cargo features](https://doc.rust-lang.org/stable/cargo/reference/features.html#the-features-section) that can be enabled:
- **serde**: Provides serialization and deserialization for [Version] and [Range].
| A node-semver compliant semver implementation in Rust. | nodejs,npm,parser,rust,semver,semantic-versioning,javascript | 2023-09-05T12:40:52Z | 2024-05-17T02:21:22Z | null | 2 | 6 | 94 | 0 | 0 | 6 | null | NOASSERTION | Rust |
amankushwaha577/MusicON | main |
# ``` MusicOn ```
In my music app project, I've created a fantastic music experience for everyone. Think of it like a magical music world on your computer or phone. You can easily explore different parts of this world, like your favorite playlists, artists, and albums, thanks to the smooth navigation I've set up.
-  `React-redux: For managing the app's state and ensuring that all components play together harmoniously, you've employed react-redux. This library acts as the conductor, orchestrating data flow and updates across your app. It helps keep track of the user's selected songs, playlists, and preferences, providing a cohesive user experience.`
-  `React.js: At the heart of this project is React.js, a powerful JavaScript library for building user interfaces. With React, you're creating the foundation of your music app, allowing you to compose interactive and dynamic components.`
-  `React-router: To provide seamless navigation within your music app, you've incorporated react-router. It acts as the guide, ensuring users can effortlessly switch between different sections, such as playlists, artists, and albums, just like moving between pages in a music catalog..`
-  `Material-ui/core: To enhance the visual appeal of your music app, you've chosen material-ui/core. This library offers a rich collection of pre-designed UI components and styles, like a set of finely tuned musical instruments ready to be played. It ensures your app looks polished and professional while maintaining a consistent design language.`
-  `Context API: You've harnessed the power of the Context API to create a seamless and interconnected experience. Like the invisible threads of a musical composition, the Context API allows you to share data and settings efficiently across various components of your app. This ensures that users' preferences and settings are maintained consistently.`
-  `SCSS: For fine-tuning the visual aesthetics of your music app, you've utilized SCSS. This dynamic stylesheet language is akin to composing a unique visual score, allowing you to customize the app's colors, fonts, and styles precisely according to your creative vision. It ensures your music app stands out with a distinct and captivating design.`
<br>
# LANGUAGES, FRAMEWORKS, LIBRARY AND DATABASE
-  `REACT.js`
-  `Redux.js`
-  `material-ui/core`
-  `material-ui/icons`
-  `Context API`
-  `SCSS`
<br>
## Attribution
[Icons](www.flaticon.com) made by Freepikfrom
[Music](https://ncs.io/music) by NCS
Please make sure you fork the repository
<br>
<br>
License
----
@Copyright MUSICON 2022
| REACT + REDUX + CONTEXT API + SCSS + MATERIAL-UI + JAVASCRIPT + HTML AND CSS | context-api,html-css-javascript,material-ui,react,redux,scss,javascript | 2023-08-31T17:49:43Z | 2023-10-14T16:48:02Z | null | 1 | 0 | 18 | 1 | 0 | 6 | null | null | JavaScript |
SerhiiRepinskyi/project-future777-frontend | main | # React homework template
Этот проект был создан при помощи
[Create React App](https://github.com/facebook/create-react-app). Для знакомства
и настройки дополнительных возможностей
[обратись к документации](https://facebook.github.io/create-react-app/docs/getting-started).
## Создание репозитория по шаблону
Используй этот репозиторий организации GoIT как шаблон для создания репозитория
своего проекта. Для этого нажми на кнопку `«Use this template»` и выбери опцию
`«Create a new repository»`, как показано на изображении.
На следующем шаге откроется страница создания нового репозитория. Заполни поле
его имени, убедись что репозиторий публичный, после чего нажми кнопку
`«Create repository from template»`.
После того как репозиторий будет создан, необходимо перейти в настройки
созданного репозитория на вкладку `Settings` > `Actions` > `General` как
показано на изображении.
Проскролив страницу до самого конца, в секции `«Workflow permissions»` выбери
опцию `«Read and write permissions»` и поставь галочку в чекбоксе. Это
необходимо для автоматизации процесса деплоя проекта.
Теперь у тебя есть личный репозиторий проекта, со структурой файлов и папок
репозитория-шаблона. Далее работай с ним как с любым другим личным репозиторием,
клонируй его себе на компьютер, пиши код, делай коммиты и отправляй их на
GitHub.
## Подготовка к работе
1. Убедись что на компьютере установлена LTS-версия Node.js.
[Скачай и установи](https://nodejs.org/en/) её если необходимо.
2. Установи базовые зависимости проекта командой `npm install`.
3. Запусти режим разработки, выполнив команду `npm start`.
4. Перейди в браузере по адресу [http://localhost:3000](http://localhost:3000).
Эта страница будет автоматически перезагружаться после сохранения изменений в
файлах проекта.
## Деплой
Продакшн версия проекта будет автоматически проходить линтинг, собираться и
деплоиться на GitHub Pages, в ветку `gh-pages`, каждый раз когда обновляется
ветка `main`. Например, после прямого пуша или принятого пул-реквеста. Для этого
необходимо в файле `package.json` отредактировать поле `homepage`, заменив
`your_username` и `your_repo_name` на свои, и отправить изменения на GitHub.
```json
"homepage": "https://your_username.github.io/your_repo_name/"
```
Далее необходимо зайти в настройки GitHub-репозитория (`Settings` > `Pages`) и
выставить раздачу продакшн версии файлов из папки `/root` ветки `gh-pages`, если
это небыло сделано автоматически.
### Статус деплоя
Статус деплоя крайнего коммита отображается иконкой возле его идентификатора.
- **Желтый цвет** - выполняется сборка и деплой проекта.
- **Зеленый цвет** - деплой завершился успешно.
- **Красный цвет** - во время линтинга, сборки или деплоя произошла ошибка.
Более детальную информацию о статусе можно посмотреть кликнув по иконке, и в
выпадающем окне перейти по ссылке `Details`.
### Живая страница
Через какое-то время, обычно пару минут, живую страницу можно будет посмотреть
по адресу указанному в отредактированном свойстве `homepage`. Например, вот
ссылка на живую версию для этого репозитория
[https://goitacademy.github.io/react-homework-template](https://goitacademy.github.io/react-homework-template).
Если открывается пустая страница, убедись что во вкладке `Console` нет ошибок
связанных с неправильными путями к CSS и JS файлам проекта (**404**). Скорее
всего у тебя неправильное значение свойства `homepage` в файле `package.json`.
### Маршрутизация
Если приложение использует библиотеку `react-router-dom` для маршрутизации,
необходимо дополнительно настроить компонент `<BrowserRouter>`, передав в пропе
`basename` точное название твоего репозитория. Слеш в начале строки обязателен.
```jsx
<BrowserRouter basename="/your_repo_name">
<App />
</BrowserRouter>
```
## Как это работает
1. После каждого пуша в ветку `main` GitHub-репозитория, запускается специальный
скрипт (GitHub Action) из файла `.github/workflows/deploy.yml`.
2. Все файлы репозитория копируются на сервер, где проект инициализируется и
проходит линтинг и сборку перед деплоем.
3. Если все шаги прошли успешно, собранная продакшн версия файлов проекта
отправляется в ветку `gh-pages`. В противном случае, в логе выполнения
скрипта будет указано в чем проблема.
| project-future777-frontend | css3,html5,javascript,nodejs,react,styled-components | 2023-08-23T21:17:31Z | 2023-09-07T12:07:29Z | null | 14 | 180 | 494 | 0 | 2 | 6 | null | null | JavaScript |
ao-space/space-web | dev | # space-web
English | [简体中文](./README_cn.md)
- [space-web](#space-web)
- [Introduction](#introduction)
- [Architecture Design](#architecture-design)
- [Development Instructions](#development-instructions)
- [Deployment Instructions](#deployment-instructions)
- [Contribution Guidelines](#contribution-guidelines)
- [Contact us](#contact-us)
- [Thanks for your contribution](#thanks-for-your-contribution)
## Introduction
The client functions as the system's frontend, granting us with access to all functionalities of the AO.space. It encompasses Web, iOS, Android platforms, providing the following key modules:
- End-to-End Encryption Channel
- Files
- Devices
- Space Application
- Developer Options
- Security
### Architecture Design
space-web is developed using JavaScript and utilizes technologies such as Vue3, Element-plus, Axios, Jsencrypt, and service-worker. The business layer includes pages such as login, quick login, mine, and homepage, and uses web localization technology to ensure smooth file operations.
### Development Instructions
1. Enter your working directory and run the command `git clone https://github.com/ao-space/space-web.git`.
2. Enter the space-web directory `cd ./space-web`.
3. Install dependencies by running `npm install`.
4. Run `npm run dev` for development.
5. This project is the web component of AO.space, and the server-side interface uses the [space-gateway](https://github.com/ao-space/space-gateway) interface. When developing, please modify the target property in the vite-dev file in the root directory to point to the space-gateway interface address.
See the following image for details.
### Deployment Instructions
1. Determine the domain name exposed to the outside world for this project and the space-gateway interface domain name.
2. If the domain name exposed to the outside world for this project and the space-gateway interface domain name are inconsistent, modify the baseurl of urlConfig in src/config/networkConfig.ts to the space-gateway interface domain name.
See the following image for details.
3. Run `docker build -t space-web .` in the project root directory.
4. Run the packaged nginx image by executing the command `docker run -d --name space-web -p 80:80 space-web` (Refer to the Docker documentation for specific Docker commands).
## Contribution Guidelines
Contributions to this project are very welcome. Here are some guidelines and suggestions to help you get involved in the project.
[Contribution Guidelines](https://github.com/ao-space/ao.space/blob/dev/docs/en/contribution-guidelines.md)
## Contact us
- Email: <developer@ao.space>
- [Official Website](https://ao.space)
- [Discussion group](https://slack.ao.space)
## Thanks for your contribution
Finally, thank you for your contribution to this project. We welcome contributions in all forms, including but not limited to code contributions, issue reports, feature requests, documentation writing, etc. We believe that with your help, this project will become more perfect and stronger.
| The client functions as the system's frontend, granting us with access to all functionalities of the AO.space. | css,html5,javascript,typescript,vue | 2023-09-05T04:41:04Z | 2023-12-13T14:05:35Z | 2023-09-21T06:19:01Z | 10 | 7 | 9 | 0 | 2 | 6 | null | Apache-2.0 | JavaScript |
adi-ray/Web-Development-Projects | main | # Web-Development-Projects | This repository contains a compilation of projects related to web development. | hacktoberfest,hacktoberfest2023,css,html,javascript,hacktoberfest-accepted | 2023-08-17T18:46:05Z | 2023-10-30T17:53:34Z | null | 11 | 12 | 45 | 3 | 10 | 6 | null | null | CSS |
xct007/meme-gen | main | # MEME Gen Maker
Create meme top/bottom text.
You need install [graphicsmagick](http://www.graphicsmagick.org/index.html) in your system before using this package.
## Installation
- use `npm`
```bash
npm install github:xct007/meme-gen
```
- use `yarn`
```bash
yarn add github:xct007/meme-gen
```
- npm package `soon`
## Usage
- *Basic*
```js
import { memeG } from "meme-gen";
const meme = new memeG();
// use image
const input_image = "./danil.jpg";
meme.image(input_image);
// top text
meme.top("Anjay");
// bottom text
meme.bottom("mabar");
// make text upper case
meme.upper_case();
// create meme and save to disk
const output = "./result.png";
meme.writeAsync(output);
// or get a image buffer
meme.bufferAsync()
```
- *image options*
```js
import { memeG } from "meme-gen";
import { readFileSync } from "fs";
const meme = new memeG();
// local path
meme.image("./danil_strok.jpg");
// using url
meme.image("https://example.com/image.jpg");
// buffer
const image_buffer = readFileSync("./danil.jpg")
meme.image(image_buffer)
// by default it will use white blank image
meme.image()
```
- *text options*
```js
import { memeG } from "meme-gen";
const meme = new memeG();
// fill text color
meme.fill("#FFF") // white #FFF
// stroke/outline
meme.stroke("#000") // black #000
meme.stroke("#000", 2) // stroke width 2
// make text upper case
meme.uppe_case()
// text padding width
meme.padding_width(40) // default 40
```
- *load custom font*
```js
import { memeG } from "meme-gen";
const meme = new memeG();
const font_path = "./myfont.ttf";
meme.load_font(font_path)
```
- *advance*
```js
import { memeG } from "meme-gen";
const image_buffer = await meme
.image("https://itsrose.life/rose.jpeg")
.load_font("./my_font.ttf")
.fill("#FFF")
.stroke("#000", 2)
.padding_width(40)
.top("OMG")
.bottom("I love you")
.upper_case()
.getBufferAsync()
console.log(image_buffer);
```
## options
- top: top text input
- bottom: bottom text input
- stroke: stroke color and width ``` hex_color: string, stroke_width: number```
- upper_case: text to upper case
- padding_width: text top/bottom padding
- load_font: use custom font
## Note
This repository project is a learning exercise, and as such it utilizes references from other open source repositories. No commercial use is intended, and all efforts have been made to ensure proper attribution has been given to any referenced libraries and code.
| Create meme using graphics magick | graphicsmagick,javascript,meme-generator,meme-maker | 2023-08-29T22:17:26Z | 2023-09-07T22:04:44Z | null | 1 | 0 | 20 | 1 | 1 | 6 | null | MIT | TypeScript |
corbado/example-passkeys-nuxtjs | main | # Passkey-First Authentication with Nuxt.js and Corbado
This is a sample implementation of the Corbado UI component being integrated into a web application built with Nuxt.js.
Please see the [full blog post](https://www.corbado.com/blog/passkeys-nuxtjs) to understand the detailed steps needed to integrate passkeys into Nuxt.js apps.
## File structure
- `layouts/default.vue`: Encapsulating layout handling Corbado project initialization
- `pages/index.vue`: component for the sign up / login screen
- `pages/profile.vue`: component for the user profile information that is shown after successful authentication
## Setup
### Prerequisites
Please follow the steps in [Getting started](https://docs.corbado.com/overview/getting-started) to create and configure
a project in the [Corbado developer panel](https://app.corbado.com/signin#register).
You need to have [Node](https://nodejs.org/en/download) and `npm` installed to run it.
## Usage
Run
```bash
npm i
```
to install all dependencies.
Finally, you can run the project locally with
```bash
npm run dev
``` | This is a sample repository of a Nuxt.js app that offers passkey authentication. | faceid,fido2,javascript,nuxt,nuxtjs,passkey,passkeys,touchid,typescript,vue | 2023-09-06T08:08:11Z | 2024-05-08T13:27:57Z | null | 6 | 1 | 16 | 1 | 0 | 6 | null | null | Vue |
The-Alice-In-Wonderland-Project/alicegame-2023 | main | # alicegame-2023
Hacktoberfest 2023 version of The Alice in Wonderland Project
## Update by Founder/Maintainer: October 11, 2023
**Unfortunately, on October 1st, I woke up sick for the first time in almost two years.**
- I ended up being _very_ sick.
- I'm back functioning as of today.
- The Alice in Wonderland Project is still on for this Hacktoberfest.
- I'm starting by doing a bit of reorganizing with the team leads today and tomorrow. (Refactoring but with people and timelines.)
August 22, 2023:
Please do not fork, or add to this repo until you've been accepted to The Alice in Wonderland Project until October 1st, 2023. This is a "placeholder" repo.
Thank you!
Applications for and an overview of 2023 are at [https://aliceproject.dev](https://aliceproject.dev)
Applications/registration for The Alice in Wonderland Project - Hacktoberfest 2023 edition open Monday, September 18, 2023.
Please read CONTRIBUTING.md for information on how to get involved and what to expect.
| Hacktoberfest 2023 version of The Alice in Wonderland Project | alice-in-wonderland,community,css,fun,game,game-development,hacktoberfest,hacktoberfest-2023,html,javascript | 2023-08-22T17:56:15Z | 2023-10-28T20:10:32Z | null | 9 | 12 | 34 | 5 | 7 | 6 | null | MPL-2.0 | null |
Tajmirul/npx-tajmirul | main | # NPX CARD
This my NPX card unique style to connect with me directly via console or terminal
👇 just hit
```bash
npx tajmirul # get to know me in unique style
```
#### I spent a non-trivial amount of effort building and designing this iteration of npx card, and I am proud of it! All I ask of you all is to put a star ⭐ on this project and not claim this effort as your own ♥.
### SCREENSHOT
#### STEPS TO CREATE YOUR OWN
The article written by our friend @jackboberg. I used the same for the reference to deploy the package. Write a [Simple npx Business Card](https://studioelsa.se/blog/open-source-oss-npx-business-card/).
| A terminal portfolio with custom commands. | javascript,portfolio,terminal-portfolio,typescript,tajmirul | 2023-09-04T09:25:29Z | 2023-09-24T04:30:50Z | null | 2 | 1 | 55 | 0 | 1 | 6 | null | null | TypeScript |
rifqanzalbina/Src-Proj | main | # SourcProject 🌟
---
## 🌟 Introduction 🌟
Welcome to **SourcProject**, a central hub where creators, developers, and tech enthusiasts come together to document and share insights on a myriad of projects, spanning web applications, desktop software, and more. Our platform is designed to be a rich repository of knowledge, fostering innovation and collaboration by providing detailed insights into various system operations, tools used, and programming languages implemented in different projects. And it's fun
## 🛠 Key Features
- **Comprehensive Documentation**: Gain access to extensive documentation on various projects that outlines tools, languages, and systems in use, helping you to glean insights and foster learning.
- **Cross-Platform Showcase**: Showcase your projects, be it web applications, desktop software, or mobile apps, and share your journey, the challenges faced, and the solutions crafted.
- **Community Collaboration**: Connect with a network of professionals and enthusiasts, fostering collaboration, and innovation through the sharing of knowledge and expertise.
- **User-Centric Interface**: Experience seamless navigation and user-friendly interface that caters to both tech-savvy individuals and beginners, making the exploration and documentation process smooth and enjoyable.
## 🌎 Vision
To build a collaborative and dynamic repository where knowledge meets innovation, fueling the growth of the tech community by providing a platform for learning, sharing, and collaboration.
## 🚀 Mission
- **Knowledge Sharing**: To create a space where individuals can share in-depth knowledge and insights about different project dynamics, fostering a culture of continuous learning and growth.
- **Innovation & Collaboration**: To facilitate innovation through collaboration, providing a platform where users can learn, share and build together.
- **Community Building**: To cultivate a thriving community of users and developers, united in their passion for technology and innovation.
## 💡 Getting Started
Begin your journey with SourcProject by exploring our rich collection of project documentations or by starting to document your project. Follow our detailed setup guide to understand how to navigate and utilize the platform effectively.
## 💬 Feedback and Contributions
Your insights are our stepping stones to improvement. We highly appreciate your feedback, suggestions, or bug reports. Feel free to open an issue or contribute to enhancing the platform further by referring to our [CONTRIBUTING.md](link-to-contributing.md-file) guide.
Join us in this exhilarating journey of reshaping the digital narrative, one project documentation at a time.
## 🤝 Contributors
A big shout-out to our contributors who have been instrumental in building this platform. Your dedication is the cornerstone of SourcProject's growth and success.
- [Toru0706](https://github.com/Toru0706)
- [ExNameless](https://github.com/Sasudar)
- [suandre35](https://github.com/suandre35)
- [williamtanuwijaya](https://github.com/williamtanuwijaya)
## Programming Language We Use
- Julia
- Python
- JavaScript
- Golang
Thank you for being a part of SourcProject. Together, we are fostering a culture of collaboration and innovation in the tech community. 🌟
| A build to make more indicated to our system | flow,microsystem,programming-language,project,system,python,pythonlibrarires,javascript,js,jslibr | 2023-09-01T03:29:08Z | 2024-02-21T14:31:26Z | null | 5 | 40 | 158 | 0 | 1 | 6 | null | null | Jupyter Notebook |
yashnaravade/GAVS-Training | master | # GAVS-Training
Gavs company training Java Fullstack
[](https://holopin.io/@yashnaravade) | Gavs company training. | java,java-fullstack,mean-stack,mern-stack,hacktoberfest,javascript | 2023-08-21T11:59:10Z | 2023-10-31T11:31:37Z | null | 3 | 1 | 202 | 0 | 5 | 6 | null | null | Java |
Yesarib/Blockchain | main | # Blockchain - A Blockchain and Miner Application
This project is a blockchain and miner application developed using Node.js. This application provides a fundamental example to understand the concepts of blockchain and miners.
## Features
- Simple blockchain structure.
- Mining process with miners.
- Real-time data communication using Socket.io.
## Getting Started
You can follow the steps below to run the project on your local machine:
1. **Clone the Repository:**
Open your terminal and clone the repository to your local machine:
```sh
git clone https://github.com/Yesarib/Blockchainn.git
2. **Install Required Packages:**
After cloning the project, open 2 console and navigate to the project directory and install the required packages:
```sh
cd Blockchain
npm install
```
```sh
cd Miner
npm install
3. **Run the Application:**
Once you have installed the required packages, start the application using the following command on both console:
```sh
nodemon start
```
or
```sh
npm start
```
The application will run by default on http://localhost:3000 (for MongoDB connection).
For socket connection, you can use http://localhost:8000.
## Blockchain Section
In the blockchain section, you can share fundamental information about the blockchain. You can explain how the blockchain works, how it's created, and how data is stored.
## Miner Section
In the miner section, you can provide details about miners. Explain how miners attempt to mine blocks, how newly mined blocks are sent to the blockchain section using sockets, and how validation and broadcasting are performed.
| 🌱 This project is a Node.js application developed to showcase the basic concepts of blockchain and mining. With this project, aim to provide a clear understanding of how blockchain technology operates and how miners contribute to the security and validity of the blockchain. | api,blockchain-technology,cryptocurrency,decentralization,distributed,javascript,miner,nodejs,socket,socket-io | 2023-08-28T12:16:58Z | 2023-09-15T19:39:46Z | null | 1 | 0 | 6 | 0 | 0 | 6 | null | null | JavaScript |
willybrauner/low-router | main | <h1 align="center" style="text-align:center">low-router 🚌</h1>
<p align="center">
<img alt="npm" src="https://img.shields.io/npm/v/@wbe/low-router">
<img alt="npm bundle size" src="https://img.shields.io/bundlephobia/minzip/%40wbe%2Flow-router">
<img alt="build" src="https://github.com/willybrauner/low-router/workflows/tests/badge.svg">
</p>
<p align="center">
`LowRouter` is a lightweight _(~=1.8Kb)_, low-level router implementation designed for use in nodejs, javascript or typescript applications. By default, `LowRouter` has no link with the browser history, but this repository provide a `createBrowserHistory` util ready to use. It also includes a `createMatcher` function to convert a route path to a regular expression, but still open to use a custom one.
## Table of Contents
- [Playground](#playground)
- [Installation](#installation)
- [Usage](#usage)
- [instance](#instance)
- [resolve](#resolve)
- [resolveSync](#resolvesync)
- [createUrl](#createurl)
- [dispose](#dispose)
- [Handle history](#handle-history)
- [Matcher](#matcher)
- [Custom matcher](#custom-matcher)
- [debug](#debug)
- [API](#api)
- [LowRouter](#lowrouter)
- [options](#options)
- [Route](#route)
- [RouteContext](#routecontext)
- [createBrowserHistory](#createbrowserhistory)
- [workflow](#workflow)
- [Acknowledgement](#acknowledgement)
- [Credits](#credits)
## Playground
The examples of this repo are available on codesandbox:
- [basic](https://codesandbox.io/s/github/willybrauner/low-router/tree/main/examples/basic)
- [basic-resolve-sync](https://codesandbox.io/s/github/willybrauner/low-router/tree/main/examples/basic-resolve-sync)
- [compose](https://codesandbox.io/s/github/willybrauner/low-router/tree/main/examples/compose)
- [custom-matcher](https://codesandbox.io/s/github/willybrauner/low-router/tree/main/examples/custom-path-to-regexp)
- [react-nested-routes](https://codesandbox.io/s/github/willybrauner/low-router/tree/main/examples/react-nested-routes)
## Installation
```shell
npm i @wbe/low-router
```
## Usage
### Instance
```javascript
import { LowRouter } from "@wbe/low-router"
const routes = [
{
path: "/",
name: "home",
action: () => "Hello home!",
},
{
path: "/admin",
name: "admin",
action: () => "Hello admin!",
children: [
{
path: "/config",
name: "config",
action: (context) => `Hello ${context.route.name}!`,
},
{
path: "/user/:id",
name: "user",
action: (context) => `Hello user! with id ${context.params.id}`,
},
],
},
]
const router = new LowRouter(routes)
```
### resolve
The `resolve` method allows you to match a given pathname or route object to a defined route and execute its associated action. It returns a Promise that resolves with the action result and route context.
```js
router.resolve("/").then(({ response, context }) => {
// response: "Hello home!"
})
```
Or, with an object param:
```js
router.resolve({ name: "user", params: { id: 123 } }).then(({ response, context }) => {
// response: "Hello user! with id 123"
})
```
### resolveSync
The `resolveSync` method is the same than resolve, but synchronously. It returns the action result and route context directly.
```js
const { response, context } = router.resolveSync("/admin/config")
// response: "Hello home!"
```
Or, with an object param:
```js
const { response, context } = router.resolveSync({ name: "user", params: { id: 123 } })
// response: "Hello user! with id 123"
```
### createUrl
The `createUrl` method generates a URL based on a route name and optional parameters.
```js
router.createUrl({ name: "config" })
// "/admin/config"
```
### dispose
The `dispose` method is used to clean up the router instance.
```js
router.dispose()
```
## Handle history
Internal `createBrowserHistory` provide a way to interact with the browser's history and listen to changes in the URL. You can integrate this functionality with the `LowRouter` class to enable client-side routing with browser history support.
```javascript
import { LowRouter, createBrowserHistory } from "@wbe/low-router"
const router = new LowRouter(routes, options)
const history = createBrowserHistory()
const unlisten = history.listen(async (location, action) => {
const response = await router.resolve(location.pathname)
// Do something with the response...
})
// Push to the browser history will trigger the router resolve method
history.push("/foo")
history.push(router.createUrl({ name: "bar", params: { id: 123 } }))
// Stop listening to history changes
unlisten()
```
On the same way, you can use every history lib you want to handle history changes, and resolve
the new pathname with the router, like [remix-run/history](https://github.com/remix-run/history).
## Matcher
The `matcher` is the function used to convert a route path to a regular expression. By default, `LowRouter` use an [internal matcher function](packages/low-router/src/createMatcher.ts). this matcher is called when the resolve method is called. You shouldn't have to use this function directly, but it's interesting to understand how it works, specially if you need to use a custom one.
```ts
import { createMatcher } from "@wbe/low-router"
const matcher = createMatcher()
const [isMatch, routeParams, queryParams, hash] = matcher(
"/user/1?lang=fr&cat=foo#section-2",
"/user/:id"
)
// isMatch: true
// routeParams: { id: "1" }
// queryParams: { lang: "fr", cat: "foo" }
// hash: "section-2"
```
This returns values are returned by `RouteContext` when the route match. For more information about the matcher full matcher API, read the [createMatcher unit tests](packages/low-router/tests/createMatcher.test.ts).
## Custom matcher
If the internal matcher doesn't respond as needed, it's possible to use a custom matcher function:
like the original [path-to-regexp package](https://github.com/pillarjs/path-to-regexp).
```ts
import { LowRouter, createMatcher } from "@wbe/low-router"
import { pathToRegexp } from "path-to-regexp"
const customPathToRegexpFn = (path: string): { keys: Record<string, string>[]; regexp: RegExp } => {
let keys = []
const regexp = pathToRegexp(path, keys)
return { keys, regexp }
}
const customMatcher = createMatcher(customPathToRegexpFn)
// ex: customMatcher("/about/:id", "/about/1")
// return: [true, { id: "1" }, {}, null]
// then, pass this customMatcher to the router options
// Now, the router will use this custom matcher with path-to-regexp to match routes
const router = new LowRouter(routes, { matcher: customMatcher })
```
This flexible custom matcher pattern as been created by [molefrog](https://github.com/molefrog) on [wouter](https://github.com/molefrog/wouter) 🙏
### debug
[@wbe/debug](https://github.com/willybrauner/debug) tool is used as dependency in this project. To enable debug logs, you can use the following commands:
- Browser debug:
```shell
localStorage.debug = "low-router:*"
```
- Node debug:
```shell
DEBUG=low-router:*
```
## API
### LowRouter
```ts
// LowRouter(routes: Route[], options?: Options)
const router = new LowRouter(routes, options)
// Resolve a pathname or a route object
// resolve(pathnameOrObject: string | { name: string; params?: RouteParams })
router.resolve(path)
router.resolve({ name: "", params: {} })
// Resolve synchronously
// resolveSync(pathnameOrObject: string | { name: string; params?: RouteParams })
router.resolveSync(path)
router.resolveSync({ name: "", params: {} })
// Create a URL based on a route name and optional parameters
// createUrl({ name: string; params?: RouteParams }): string
router.createUrl({ name: "", params: {} })
// Clean up the router instance
// dispose(): void
router.dispose()
```
### Options
```ts
const options: Options = {
// The base URL path for all routes.
// default: `/`.
base: "/",
// called when the router is initialized
// onInit: () => void
onInit: () => {},
// called when no matching route is found during resolution
// onError: () => void
onError: (context, error) => {},
// called after a route's action has been executed successfully
// onResolve: ({response: ActionResponse<A>, context: RouteContext<A, P>}) => void
onResolve: ({ response, context }) => {},
// called when the router is disposed of using the `dispose` method
// onDispose: () => void
onDispose: () => {},
// Custom function to convert a route path to a regular expression.
// Default: the internal `createMatcher()` fn
// matcher: Matcher
matcher: createMatcher(),
// give an id to the router instance, useful when you have multiple router instances
// and you want to identify them from debug logs
// id?: number | string
id: 1,
}
```
### RouteContext
`RouteContext` is the 1st level route object, passed to the route action function.
It contains all the information about the current context, plus the route object itself.
```ts
interface RouteContext {
// The current pathname
pathname: string
// The current path params
// (ex: /:foo/:bar)
params: RouteParams
// The current query params
// (ex: ?foo=bar&baz=qux)
query: QueryParams
// The current hash
// (ex: #foo)
hash: Hash
// the route base URL
base: string
// → the route object associated to this context
route: Route
// parent route context, useful when the current is a child route
parent: RouteContext | null
}
```
### Route
`Route` is the route object definition passed to the `LowRouter` constructor, define by the developer.
```ts
interface Route {
// The route path
// (ex: /foo/:bar)
path: string
// The route name, useful to get a route by name
name?: string
// The route action function is the main function of the route
// this function is called when the route is resolved
action?: (context: RouteContext) => Promise<any> | any
// The route children
children?: Route[]
// The route props can be any data you want to pass/associate to the route
props?: Record<string, any>
}
```
### createBrowserHistory
`createBrowserHistory()` will return an object:
```ts
export interface HistoryAPI {
// associate a callback to the history change event
// return a function to stop listening
listen: (callback: (location: Location, action: Action) => void) => () => void
// Push a new patname to the history
push: (pathname: string) => void
}
```
## Workflow
```shell
# clone repo
git clone {repo}
# install all dependencies
pnpm i
# run build watch
pnpm run build:watch
# run test watch
pnpm run test:watch
# run examples dev server
pnpm run dev
```
## Acknowledgement
This project is inspired by the following projects:
- [universal-router](https://github.com/kriasoft/universal-router/)
- [wouter](https://github.com/molefrog/wouter)
- [history](https://github.com/remix-run/history)
## Credits
© [Willy Brauner](https://willybrauner.com)
| low level base routing for nodejs, javascript and typescript | browserhistory,javascript,low-level,nodejs,router,typescript | 2023-09-06T20:22:44Z | 2024-04-29T12:07:07Z | 2024-04-29T12:07:55Z | 1 | 17 | 18 | 3 | 0 | 6 | null | null | TypeScript |
Awayume/github-pr-tasklist-checker | main | docs/README.md | An Action to check if the PR task list is complete | github,github-actions,project-management,pull-requests,task,task-manager,cjs,javascript,js,node | 2023-08-19T08:48:39Z | 2024-04-20T01:58:55Z | 2024-04-20T02:02:34Z | 4 | 4 | 46 | 2 | 1 | 6 | null | MIT | JavaScript |
xambassador/chrona | main | # chrona
Simple HTTP request logger middleware for express.js inspired by [koa-logger](https://github.com/koajs/logger), written in typescript.
## Installation
This is a [Node.js](https://nodejs.org/en/) module available through the [npm registry](https://www.npmjs.com/). Installation is done using the
[`npm install` command](https://docs.npmjs.com/getting-started/installing-npm-packages-locally):
```sh
$ npm install chrona
```
## API
```js
var chrona = require('chrona')
app.use(chrona())
```
> Make sure to add chrona to first in middleware chain.
### chrona(format, options)
Create a new chrona middleware function using the given `format` and `options`. By default, it creates with default `format` and default `options` value.
The `format` argument is a string of predefined token names(see below for token names).
#### Predefined token names.
- :incoming
- :[incoming]
- :remote-address
- :[remote-address]
- :date
- :[date]
- :method
- :[method]
- :url
- :[url]
- :http-version
- :[http-version]
- :status
- :[status]
- :content-length
- :[content-length]
- :response-time
- :[response-time]
- :referrer
- :[referrer]
- :user-agent
- :[user-agent]
> :incoming is special one, If format string contains it, it add directional arrows(`-->`) for incoming request and outgoing response in log string.
### Using a predefined format string
```js
app.use(chrona(":incoming :method :url :status :response-time :content-length :user-agent :http-version"))
```
### options
chroma accepts options argument as a function or an object. Right now chroma has only one option call transporter which can be provided
either by passing function or an object with transporter key. Transporter is for change chrona's default transporter(where to show log messages)
which is `console.log`.
### Use Custom Transporter
```js
// If you want to go with default format string, then just pass
// empty string or null
app.use(chrona(null, function(str, args) => {
// pass str and args to your own transporter like winston etc.
}))
```
| Simple HTTP request logger middleware for express.js inspired from koa-logger, written in typescript. | express,http-logger,logger,logger-middleware,middleware,nodejs,chalk,javascript,typescript,minimal | 2023-08-12T19:49:09Z | 2024-01-26T12:18:51Z | 2024-01-26T12:18:51Z | 1 | 0 | 19 | 0 | 0 | 6 | null | MIT | TypeScript |
antonyanwm/Chess | master | # Custom Chess Gaming
[My Website](https://chess-bay-nine.vercel.app/).
| chess, game, JS, ReactJS, OOP, Folder Structure, Data Structure ... | chess-engine,data-structures,folder-structure,oop,javascript,react,chess,game | 2023-08-14T21:24:39Z | 2023-12-05T20:39:10Z | null | 2 | 2 | 16 | 0 | 1 | 6 | null | null | JavaScript |
Thzzao/OrdenaCSS | main | # Ferramenta de ordenação de propriedades CSS 📋
Projeto individual do curso de Desenvolvedor Full Stack Resilia. Criação de uma ferramenta que recebe as propriedades do CSS e as ordena em ordem alfabética.
## Apresentação 🚀
Sistema desenvolvido para organizar em ordem alfabética as propriedades do CSS. Para esse projeto foi utilizado o [NodeJS](https://nodejs.org/en) (versão 18.17.1) juntamente com o [VSCode](https://code.visualstudio.com/) para criar a lógica e a biblioteca [Readline-Sync](https://www.npmjs.com/package/readline-sync) que permite que sejam informados dados ao sistema atráves da linha de comando.
## Requisitos ⚠️
Para que o sistema funcione perfeitamente tenha o **[NodeJS](https://nodejs.org/en)** instalado em seu computador.
## Funcionalidades 📚
- Ordena as propriedades CSS em ordem alfabética.
**_ENTRADA_**
```bash
Digite pelo menos 2 propriedades do CSS.
Para ordenar digite 'sair'
Digite a propriedade: font-size
Digite a propriedade: color
Digite a propriedade: padding
Digite a propriedade: border-block
Digite a propriedade: animation-name
Digite a propriedade: sair
```
**_SAÍDA_**
```bash
LISTA DOS ELEMENTOS ORDENADOS:
animation-name
border-block
color
font-size
padding
```
***OBS.:*** *Não esquecer de digitar o 'sair' para o sistema retornar a lista ordenada.*
- Tratamento de erros
Caso o usuário não digite nada ou digite um número na entrada de dados, o sistema acusa a mensagem de erro `Entrada inválida` e não insere a respectiva entrada na lista como mostra o exemplo:
**_ENTRADA_**
```bash
Digite pelo menos 2 propriedades do CSS.
Para ordenar digite 'sair'
Digite a propriedade: font-size
Digite a propriedade:
Entrada inválida
Digite a propriedade: padding
Digite a propriedade: 123456
Entrada inválida
Digite a propriedade: animation-name
Digite a propriedade: sair
```
**_SAÍDA_**
```bash
LISTA DOS ELEMENTOS ORDENADOS:
animation-name
font-size
padding
```
## Instalação 🔧
Depois de instalado o NodeJS em sua máquina:
1. Clone o repositório usando a `URL` do projeto **OU** a chave `SSH` no terminal:
```bash
URL: git clone https://github.com/Thzzao/OrdenaCSSResilia.git
SSH: git clone git@github.com:Thzzao/OrdenaCSSResilia.git
```
2. Depois entre na pasta `OrdenaCSSResilia` usando o comando:
```bash
cd OrdenaCSSResilia
```
3. Depois de chegar com o terminal na pasta correspondente, use o comando para instalar as dependências necessárias da ferramenta (no caso o `Readline-sync`):
```bash
npm install
```
**OU**
```bash
npm install readline-sync
```
4. Depois de feita a instalação, para `iniciar o sistema` digite no terminal:
```bash
npm start
```
#### GIF da instalação
## Contribuição 💡
Contribuições são bem-vindas! Sinta-se à vontade para abrir issues ou enviar pull requests.
## Referências 🔍
[Documentação do NodeJS](https://nodejs.org/en/docs) - Sistema desenvolvido usando a versão 18.17.1 LTS do NodeJS.
[Documentação do Readline-sync](https://www.npmjs.com/package/readline-sync)
## Autor 🖌
<p align="center">Projeto desenvolvido por Thiago Souza 🤙
Para mais informações sobre o projeto, entre em contato comigo através do email: thiago.santos1160@gmail.com
</p>
| Projeto individual do curso de Desenvolvedor Full Stack Resilia. Criação de uma ferramenta de ordenação de propriedades do CSS em ordem alfabética utilizando NodeJS. | css,javascript,nodejs | 2023-08-28T20:03:47Z | 2023-09-01T02:47:46Z | null | 1 | 0 | 23 | 0 | 0 | 6 | null | null | JavaScript |
kaykeeb3/biblioteca-SIBI | main | <h1 align="center">SIBI - Gerardo José</h1>
<p align="center">SIBI - Gerardo José: é um sistema de uso administrativo para bibliotecas</p>
## 🚀 Tecnologias
Esse projeto foi desenvolvido com as seguintes tecnologias:
- Php
- MYSQL
- HTML
- CSS
- Javascript
- Git e Github
## 💻 Projeto
SIBI - Gerardo José = Sistema de Biblioteca Gerardo José, é um sistema de uso administrativo, ele tem como principal objetivo ter total controle sobre o gerenciamento de uma Biblioteca por meio virtual, atualmente ele encontra-se na sua V1 inicial. Ele foi desenvolvido aparti de uma necessidade vista que ocasionava sérios problemas, vale ressaltar que foi desenvolvido como um trabalho voluntário, que foi retribuído a Escola. obs: objetivo principal do projeto é facilidade, segurança e praticidade.
- [Visite o projeto](https://sibi.vercel.app/)
<br>
## 😎 Créditos
- [Kayke Barbosa](https://kaykedev.vercel.app/)
- [João Alison](https://joaoalison-web.vercel.app/)
- [Romário Henrique](https://github.com/RomarioHenrique)
- [Bruno Rodrigues](https://github.com/Brunno-Rodrigues-Lira)
- [EEEP Gerardo José Dias de Loiola](https://github.com/EEEP-Gerardo)
| SIBI - Gerardo José: um sistema administrativo robusto e eficiente projetado para otimizar todas as operações relacionadas a bibliotecas. Com recursos avançados e uma interface amigável. | chatgpt,css,html,javascript,mysql,php | 2023-09-11T18:00:39Z | 2023-11-11T11:38:02Z | null | 2 | 0 | 6 | 0 | 1 | 6 | null | null | PHP |
M-YasirGhaffar/real-estate-static-website-html-css-javascript | main | # Real Estate Website Showcase
This is a responsive real estate website showcasing my skills in HTML, CSS, and JavaScript. The website aims to demonstrate a visually appealing and functional design for a real estate agency. The website features various sections such as home, popular properties, values, contact, and footer.
## Features
- Responsive design to ensure optimal user experience across different devices and screen sizes.
- Interactive navigation menu with smooth scrolling to different sections of the page.
- Popular properties section using a swiper carousel for showcasing featured properties.
- Values section with accordion-style content for presenting key values and information.
- Contact section with contact information and a contact card layout.
- Dark mode feature for better readability in low-light environments.
- Scroll-to-top button for easy navigation back to the top of the page.
- Theme toggling to switch between light and dark modes.
## Technologies Used
- HTML: Structured the website content and layout.
- CSS: Styled the website components, sections, and responsive design.
- JavaScript: Implemented interactive features such as smooth scrolling, theme toggling, accordion behavior, and swiper carousel.
## Getting Started
1. Clone this repository to your local machine using:
```
git clone https://github.com/your-username/real-estate-website.git
```
2. Open the `index.html` file in your web browser to view the website.
## Usage
- Navigate through the website using the interactive menu and smooth scrolling.
- Explore the popular properties section to view featured properties.
- Expand and collapse the values accordion to learn more about the company's values.
- Contact the agency using the provided contact information.
## Contributing
Contributions are welcome! If you find any issues or have suggestions for improvements, please open an issue or create a pull request. | Complete responsive real estate website | css,html,javascript,night-mode,real-estate,responsive,responsive-web-design,static | 2023-08-15T01:05:00Z | 2023-08-28T20:33:12Z | null | 1 | 0 | 9 | 0 | 0 | 6 | null | null | HTML |
ZenekeZene/sleepy-spider | main | [](https://app.netlify.com/sites/sleepy-spider/deploys)
[](https://github.com/sleepy-spider/sleepy-spider/actions/workflows/test-unit.yml)
[](https://github.com/sleepy-spider/sleepy-spider/actions/workflows/playwright.yml)
# SLEEPY SPIDER
### Oh, no! Sleepy has fallen into a deep sleep!
It's a game half clicker, half quiz. You have to achieve the highest possible score within a one-minute time limit.
<img src="./front/public/readme_images/coffee.gif" width="200">
<br />
<br />
# 🎮 How to play
Visit: https://bilbostack.zenekezene.com.
### Instructions to play
- Tap as many times in a minute to help Sleepy wake up.
- Answer questions correctly to get bonus points.
- Challenge your friends and try to be the best. You can login with your Twitter account.
<br />
<br />
---
# 💻 Only for developers
## 🌱 Installation
### Prerequisites
- ***Node v18 or higher***.
### How install
The ***all-in-one*** script to install and launch in development mode is defined <a href="#all-in-one-script-included-installation">below</a>. But you can install front and back separately:
```
$ cd front
$ npm install
$ cd ../back
$ npm install
```
## 🚀 Getting started
### Development mode
#### All-in-one script (included installation)
To launch the dev mode, you can launch the all-in-one script called 'wakeup.sh'.
This script launches the front and back projects together.
```
$ ./wakeup.sh
```
#### Separately
You can launch back and front separately.
```
$ cd front
$ npm run dev
$ cd ../back
$ npm run start
```
#### View the project
Finally, you can open the frontend with your browser: `localhost:8000`.
The backend will be listening in `localhost:3000`.
---
## Production mode
### Front:
```
$ cd front
$ npm run build
```
### Library:
```
$ cd lib
$ npm run build
```
Note: You may want to publish a new version of the package (in <a href="https://docs.npmjs.com/cli/v8/using-npm/registry">npm public registry</a>) and then install it in the front dependencies.
```
$ npm version X.X.X
$ npm publish
```
### Back:
Build process is not necessary. Only deploy the last version of back on your favorite server.
We uses <a href="https://railway.app/">Railway</a> but you can use whatever.
#### Different environments
There are more instructions to generate differente API environment inside the subfolder [/back/README.md](./back/README.md).
#### API URL
https://css-api.up.railway.app/api/v1/questions
# 🛣️ Roadmap
Some next steps to include:
- Weekly challenges and gifts.
- Landing page.
- Replay game without reload.
- Legal notes.
- Night mode.
You can view the roadmap visiting this link: [Sleepy Spider, the pet project](https://zeneke.notion.site/Ara-a-b00b9e23adc445108bbe3744acfdf275).
# 💡 Idea
This project is an experiment to test the capabilities of canvas. It also serves as a challenge to practice using vanilla JS without the need for frameworks like React or Vue.
This project started like almost all of them: with pencil and paper.
<section style="display: flex; gap: 1rem; flex-wrap: wrap;">
<img src="./front/public/readme_images/sketch.jpeg" min-width="100" height="auto" max-height="100" alt="Sketch one" />
<img src="./front/public/readme_images/sketch2.png" min-width="200" height="auto" max-height="200" alt="Sketch two" />
</section>
---
# 🗣️ Stay in touch
- [Twitter](https://twitter.com/zenekezene)
- [Instagram](https://instagram.com/zenekezene)
- [Linkedin](https://www.linkedin.com/in/hectorvillarm/)
# Contribution
The main purpose of this repository is to continue learning JS and canvas posibilities. Development of Sleepy Spider happens in the open on GitHub, and we are grateful to the community for contributing bugfixes and improvements.
And you can help donating:
<a href="https://www.buymeacoffee.com/zeneke" target="_blank"><img src="https://cdn.buymeacoffee.com/buttons/v2/default-yellow.png" alt="Buy Me A Coffee" style="height: 60px !important;width: 217px !important;" ></a>
<br />
<br />
## Contributors
<div style="display: flex; gap: 1rem;">
<a href="https://github.com/zenekezene" style="display: inline-flex; flex-direction: column; align-items: center;">
<img style="display: inline; border-radius: 50%; margin-right: 0.5rem;" src="https://github.com/zenekezene.png" width="60px;" alt="Zeneke"/></a>
<a href="https://github.com/arturobarbaro" style="display: inline-flex; flex-direction: column; align-items: center;">
<img style="display: inline; border-radius: 50%; margin-right: 0.5rem;" src="https://github.com/arturobarbaro.png" width="60px;" alt="Arturo Barba" /></a>
</div>
---
# License
MIT License
Copyright (c) [2023] [@zenekezene, @arturobarbaro].
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
<img src="https://sleepy.zenekezene.com/sleepy.jpg" alt="Sleepy Spider" width="200" style="border-radius: 10px"/>
| It's a game half clicker, half quiz. You have to achieve the highest possible score within a one-minute time limit. A creative experiment to test the capabilities of canvas and JS. | canvas,javascript,quizgame | 2023-08-11T15:55:13Z | 2024-01-26T11:46:59Z | null | 5 | 2 | 527 | 1 | 1 | 6 | null | null | JavaScript |
Mehdi0x90/Red-Team | main | # Red Teaming
Red teaming can be defined as the process of testing your cybersecurity effectiveness through the removal of defender bias by applying an adversarial lens to your organization.
Red teaming occurs when ethical hackers are authorized by your organization to emulate real attackers’ tactics, techniques and procedures (TTPs) against your own systems.
## Table of Contents
* [Data Transfer Techniques](https://github.com/Mehdi0x90/Red-Team/blob/main/Data%20Transfer%20Techniques.md)
* [Powershell Without Powershell.exe](https://github.com/Mehdi0x90/Red-Team/blob/main/Powershell%20Without%20Powershell.md)
* [Tips and Tricks](https://github.com/Mehdi0x90/Red-Team/blob/main/Tips%20and%20Tricks.md)
## Red Team Scenarios
* [Bypass Application Whitelisting](https://github.com/Mehdi0x90/Red-Team/blob/main/Bypass%20application%20whitelisting.md)
* [FTP > Path Traversal > CVE](https://github.com/Mehdi0x90/Red-Team/blob/main/FTP%20%3E%20Path%20Traversal%20%3E%20CVE.md)
* [Inject Macros from a Remote](https://github.com/Mehdi0x90/Red-Team/blob/main/Inject%20Macros%20from%20a%20Remote.md)
* [Password Spraying OWA > Remote Shell](https://github.com/Mehdi0x90/Red-Team/blob/main/Password%20Spraying%20OWA%20%3E%20RCE.md)
* [Redis Exploitation](https://github.com/Mehdi0x90/Red-Team/blob/main/Redis%20Exploitation.md)
## Coding & Scripting
* [Bash](https://github.com/Mehdi0x90/Scripts/tree/main/Bash)
* [C/C++](https://github.com/Mehdi0x90/Scripts/tree/main/CPP)
* [Python](https://github.com/Mehdi0x90/Scripts/tree/main/Python)
* [JavaScript](https://github.com/Mehdi0x90/Scripts/tree/main/JavaScript)
* [Powershell](https://github.com/Mehdi0x90/Coding/tree/main/Powershell)
-----
All content of this repository will always be updated...
| Red teaming is an attack technique used in cyber security to test how an organisation would respond to a genuine cyber attack. It is done through an Ethical Hacking team or similar offensive security team. | bash,exploit,hacking-tools,javascript,js,pentesting,python,script,bugbounty,bughunter | 2023-08-28T03:57:31Z | 2024-02-09T15:09:10Z | null | 1 | 0 | 90 | 0 | 0 | 6 | null | null | Python |
sayan404/TaskPulse | main | # TaskPulse
TaskPulse is an intuitive application designed to help users register personalized tasks and efficiently track them based on their status. Whether you're managing personal projects, work tasks, or daily chores, TaskPulse provides a streamlined solution for keeping your tasks organized and ensuring nothing slips through the cracks.
**<p align="center">Participating in</p>**
<br><br>
<div align="center"><a href="#"><img src="https://www.jwoc.tech/_next/static/media/jwoc-2024.652c49b8.svg" alt="Banner" width="30%"/></a></div>
## Features
- **Task Registration**: Easily register new tasks with detailed information, including task name, description, due date, and priority.
- **Status Tracking**: Categorize tasks based on their status (e.g., To-Do, In Progress, Completed) to monitor progress at a glance.
- **Priority Sorting**: Prioritize tasks by assigning different priority levels, ensuring that important tasks are given the attention they deserve.
- **User-Friendly Interface**: The application boasts an intuitive and user-friendly interface, making task management a seamless and enjoyable experience.
- **Notification System**: Receive timely reminders and notifications for approaching due dates, helping you stay on top of your tasks.
## Installation
To get started with TaskPulse, follow these steps:
1. **Clone the Repository**:
```bash
git clone https://github.com/your-username/TaskPulse.git
cd TaskPulse
```
2. **Backend Setup**:
- Create a `.env` file in the `backend` folder.
- Add the following variables to the `.env` file:
```env
PORT=8080
MONGODB_URL=<Your MongoDB Connection URL>
ENCRYPTION_REF=<Your Encryption Reference>
```
- Open a terminal and navigate to the `backend` folder:
`bash
cd backend
`
Run the frontend development server using the following command:
`bash
npm run dev
`
Ensure that you have a MongoDB instance running and replace `<Your MongoDB Connection URL>` with the appropriate connection URL. The `ENCRYPTION_REF` is a reference used for encryption; replace it with a secret key for your application.
3. **Frontend Setup**:
- Open a new terminal and navigate to the `frontend` folder:
```bash
cd frontend
```
- Install the required dependencies:
```bash
npm install
```
- Run the frontend development server with the following command:
```bash
npm run dev
```
The frontend development server will start, and you can access the application at `localhost server` by default. Make sure to complete the backend setup (as mentioned in step 2) before running the frontend to ensure proper communication between the frontend and backend.
4. **Pushing Changes to GitHub**:
Once you have made your changes and finalized your code in the local files, follow these steps to push the changes to GitHub:
- Create a new branch for your changes:
```bash
git branch <your_branch_name>
```
- Switch to the new branch:
```bash
git checkout <your_branch_name>
```
- Add all changes to the staging area:
```bash
git add .
```
- Commit the changes with a meaningful commit message:
```bash
git commit -m "Your commit message here"
```
- Push the changes to the remote repository (GitHub):
```bash
git push origin <your_branch_name>
```
After pushing the changes, you can create a pull request on GitHub to merge your changes into the main branch or any desired target branch.
Note: Make sure you replace `<your_branch_name>` with the actual name you chose for your new branch.
| an application that helps people to register and track there work | expressjs,mern-stack,mongodb,nodejs,reactjs,beginner-friendly,css,full-stack,javascript | 2023-08-28T09:12:03Z | 2024-02-26T14:11:53Z | null | 10 | 23 | 77 | 4 | 10 | 6 | null | MIT | JavaScript |
realapire/geoguessr-cheat | master | # ApvGuesser - GeoGuessr Extractor Chrome Extension
**TESTED IN EVERY GAMEMODE**
## How to Use
1. **Installation**
- Clone or download the repository to your local machine.
- Open Google Chrome and navigate to `chrome://extensions/`.
- Enable the "Developer mode" toggle switch in the top right corner.
- Click on the "Load unpacked" button and select the directory where you saved the extension files.
2. **Usage**
- After installing the extension, navigate to a GeoGuessr game session.
- The extension will automatically detect and extract the coordinates of the current location.
- Press `Ctrl + Shift` (ICON WITH EYE) to display a popup alert with the human-readable location information.
- Press `Ctrl + Space` (ICON WITH PIN) to open a new tab with the location plotted on Google Maps.
<br><br>
User-Interface With ApvGuessr:<br>
User-Interface Without ApvGuessr:<br>
| Geoguessr cheat that actually works | geoguessr,javascript,script,geoguessr-cheat,extension | 2023-08-25T04:07:49Z | 2024-04-27T19:34:31Z | 2024-04-15T17:37:35Z | 1 | 2 | 25 | 0 | 1 | 6 | null | null | JavaScript |
DevCodeMathias/BOOK-SERVER.JS | main | # Book and Author Management Application📚
This is a sample project for a book and author management application using Node.js, Express.js, and MongoDB. It implements a basic CRUD (Create, Read, Update, Delete) API for managing books and authors
## Installation
To run this project, you'll need to have Node.js and MongoDB installed on your system. Follow these steps:
1. Clone this repository.
2. Navigate to the project directory in your terminal.
3. Install dependencies by running the command: `npm install`
4. Start the server with: `node server.js`
## Features
| Action | Endpoint | Description |
|----------------------------|----------------------------------------------------|-------------------------------------------------------|
| List Books | [http://localhost:3000/books](http://localhost:3000/books) | Endpoint to list all books |
| List Authors | [http://localhost:3000/authors](http://localhost:3000/authors) | Endpoint to list all authors |
| Add Book | [http://localhost:3000/books](http://localhost:3000/books) | Send a POST request with book details in JSON |
| Add Author | [http://localhost:3000/authors](http://localhost:3000/authors) | Send a POST request with author details in JSON |
| Update Book | [http://localhost:3000/books/:id](http://localhost:3000/books/:id) | Send a PUT request with updated book details |
| Update Author | [http://localhost:3000/authors/:id](http://localhost:3000/authors/:id) | Send a PUT request with updated author details |
| Delete Book | [http://localhost:3000/books/:id](http://localhost:3000/books/:id) | Send a DELETE request to delete a book |
| Delete Author | [http://localhost:3000/authors/:id](http://localhost:3000/authors/:id) | Send a DELETE request to delete an author |
| Search and Filtering Books | [http://localhost:3000/books/search](http://localhost:3000/books/search? (the req )) | Send a GET request to search and filter books |
| Add book to favorite List | [http://localhost:3000/books/AddFavoriteList](http://localhost:3000/books/AddFavoriteList) | Send a PUSH to favorit List
| Get Favorite | [http://localhost:3000//books/AddFavoriteList](http://localhost:3000/books/AddFavoriteList) | Endpoint to list favotire List |
## Project Structure
This project follows the MVC (Model-View-Controller), which helps in organizing the codebase into separate components. Here's a brief overview of the project's structure:
```bash
project-root-directory
├── src
│ ├── app.js
│ ├── config
│ │ └── dbConfig.js
│ ├── Err
│ │ ├──badRequest.js
│ │ ├──baseErr.js
│ │ ├── notfound.js
│ │ └──validationerr.js
│ ├── controllers
│ │ ├── AuthoresController.js
│ │ └── booksController.js
│ ├── middleware
│ │ ├── errorHandling.js
│ │ ├── Handler404.js
│ └── pagination.js
│ ├── models
│ │ ├── Author.js
│ │ ├── Books.js
│ │ ├──globalValidation.js
│ │ └──index.js
│ └── routes
│ ├── index.js
│ ├── booksRoutes.js
│ └──authorsRoutes.js
├── package.json
├── .eslintrc.json
├── Server.js
└── README.md
```
## JSON Format
This API uses JSON (JavaScript Object Notation) for data exchange. When interacting with the API, ensure that your requests and responses are formatted in JSON. Below are examples of the JSON structures for books and authors:
### Book JSON Structure:
```json
[
{
"_id": "64fa88ef1c468255e84dce64",
"title": "To Kill a Mockingbird",
"author": {
"_id": "64fa88a81c468255e84dce61",
"name": "Harper Lee"
},
"publisher": "J.B. Lippincott & Co.",
"pageCount": 281,
}
]
```
## Testing with Postman
You can use [Postman](https://www.postman.com/) to test the API endpoints. Import the provided Postman collection for easy testing.
## .env File Configuration
⚠️ Important: This project requires the setup of a .env file to manage sensitive environment variables, such as the MongoDB database connection string. We recommend users to configure this file with their own data.
## Contribution
Feel free to open issues or send pull requests for improvements.
## License
This project is licensed under the MIT License.
| This repository showcases a sample book and author management application, featuring a CRUD API REST built with Node.js, Express.js, and MongoDB | api,backend,crud-api,javascript,nodejs,postman-test,mvc | 2023-09-04T13:15:52Z | 2024-03-20T19:22:50Z | null | 2 | 0 | 40 | 0 | 0 | 6 | null | null | JavaScript |
Oskar0112/CRUD_Django-Tailwind | main | # CRUD_Django-Tailwind
It is still in progress
It would be release soon. | crud sample using Django, Tailwind CSS and PostgreSQL. | django-framework,postgresql,python3,tailwindcss,javascript | 2023-08-10T09:45:25Z | 2023-08-23T08:35:58Z | null | 2 | 12 | 26 | 4 | 0 | 6 | null | null | HTML |
express-rate-limit/ratelimit-header-parser | main | # ratelimit-header-parser
[](https://github.com/express-rate-limit/ratelimit-header-parser/actions/workflows/ci.yml)
[](https://npmjs.org/package/ratelimit-header-parser 'View this project on NPM')
Parse RateLimit headers of various forms into a normalized format. Supports the
combined form from
[draft 7](https://datatracker.ietf.org/doc/html/draft-ietf-httpapi-ratelimit-headers-07)
of the
[IETF Rate Limit Headers standard](https://github.com/ietf-wg-httpapi/ratelimit-headers),
the uncombined `RateLimit-*` format of earlier drafts, traditional
`X-RateLimit-*` headers, and a few other formats.
## Usage:
```js
import { parseRateLimit } from 'ratelimit-header-parser'
const response = await fetch(
'https://api.github.com/repos/express-rate-limit/express-rate-limit/contributors?anon=1',
)
console.log('github ratelimit:', parseRateLimit(response))
// > github ratelimit: { limit: 60, used: 1, remaining: 59, reset: 2023-08-25T04:16:48.000Z }
```
## API
### parseRateLimit(responseOrHeadersObject, [options]) => Object | undefined
Scans the input for ratelimit headers in a variety of formats and returns the
result in a consistent format, or undefined if it fails to find any ratelimit
headers.
- `responseOrHeadersObject`: May be either a fetch-style Response or Headers
object or a node.js-style response or headers object
- `options`: Optional object with the following optional fields:
- `reset`: How to parse the reset field. If unset, the parser will guess based
on the content. Accepts the following strings:
- `'date'`: past the value to `new Date(...)` to let the JavaScript engine
parse it
- `'unix'`: treat the value as the number of seconds since January 1, 1970
(A.K.A a unix timestamp)
- `'seconds'`: treat the value as the number of seconds from the current
time
- `'milliseconds'`: treat the value as the number of milliseconds from the
current time
Returns a object with the following fields, or undefined if it does not find any
rate-limit headers.
```
{
limit: number
used: number
remaining: number
reset: Date or undefined
}
```
| Parse RateLimit headers of various forms into a normalized format | api,header,headers,parser,rate-limit,rate-limiting,rest-api,deno,javascript,nodejs | 2023-08-21T12:56:41Z | 2023-08-25T04:53:10Z | null | 3 | 1 | 25 | 1 | 0 | 6 | null | MIT | TypeScript |
OreCart/OreCart-App | main | # Ore Cart App [](https://opensource.org/licenses/Apache-2.0)
The master monorepo for all OreCart app software! The OreCart app includes a backend made with [FastAPI](https://fastapi.tiangolo.com), an admin dashboard built with [React](https://react.dev/)/[Vite](https://v3.vitejs.dev/guide/), and a crossplatform mobile app made with [React-Native](https://reactnative.dev).
For full documentation and project details, please see the Google Drive (ask leads for access) and [orecart.github.io](https://orecart.github.io). The frontend, frontend-admin, and backend folders have READMEs with more information about developing in each as well.
## General Environment Setup
For this project you will need [Docker](https://www.docker.com), [Node.js](https://nodejs.org/en), and [Python 3](https://www.python.org).
We use docker compose to make running the application consistent and simple.
To start the application run: `docker compose up`.
If you want to run it in the background run: `docker compose up -d`.
If you want to rebuild the docker containers run: `docker compose build`.
To start the application in a development mode (it will restart when files are saved) run: `docker compose watch`.
*These commands should be ran at the root level of the project.*
## Contribution Guidelines
Contributors (aka "The OreCart Team") must be approved by the current [OreCart/leads](https://github.com/orgs/OreCart/teams/leads) team.
Outside contributors are not allowed unless explicit approval is granted by leads.
Do not push code directly to main -- the branch is locked for this anyways! Please use branches for each new feature and submit a pull request when ready.
Branch names should be short but descriptive, and all lowercase.
Each pull request requires a **minimum of two relevant reviewers** (leads or team members) for approval and merging.
## Legal Notices
Any references to Colorado School of Mines (aka "Mines", "CSM"), Innov8x, or official OreCart brand identity are used with
permission for this project, however, this project is not owned by Mines or Mines ACM itself. See the [LICENSE](https://github.com/OreCart/OreCart-App/blob/main/LICENSE) for more details.
| The main repository for OreCart's frontend and backend | javascript,react-native,python | 2023-09-06T00:50:01Z | 2024-05-13T15:59:22Z | null | 7 | 112 | 190 | 5 | 1 | 6 | null | Apache-2.0 | TypeScript |
bluecraank/open-signage | master | <h1 align="center" id="title">open-signage</h1>
<p id="description">Create signage for digital content based on web browser built with Laravel</p>
[](https://github.com/bluecraank/open-signage/actions/workflows/docker-publish.yml)
# Requirements
- Your monitor only needs a webbrowser with javascript
- Use a Raspberry Pi 3B or higher or any other device with browser
- Not supported: Raspberry Zero 2W, Raspberry Pi 2B
- Memory amount depends on amount of slides, recommend at least 1GB
- Recommendation: <a href="https://github.com/guysoft/FullPageOS">FullPageOS</a>
# Usage
- Export Presentation as PDF and upload document
- Background processing starts and generates images from each page
- Create and register monitor
- Assign presentation to monitor, group or schedule
- Automatically display presentation on monitor
- Create schedules or groups to easily assign presentations to multiple devices
# Functions
- LDAP-Login only
- Create, manage, delete devices
- Create, manage, delete groups
- Create, manage, delete presentations
- Create, manage, delete schedules
- Manage monitor settings (e.g Slide-duration)
- Discover url for easy mass deployment (IP recognition)
- Logging of actions in UI
- Rightmanagement
# Clientside browser functions
- Hides the cursor
- Force monitor reload on request
- Force monitor reload after x hours to prevent memory leak
# Configuration
## Docker
- Edit docker-compose.yml to your needs
## Native
- Move env.example to .env
- Setup LDAP Connection
```
LDAP_LOGGING=true
LDAP_CONNECTION=default
LDAP_HOST=some.ldap.server
LDAP_USERNAME="CN=ro_mis,CN=Users,DC=ldap,DC=server"
LDAP_PASSWORD=
LDAP_PORT=636
LDAP_BASE_DN="dc=ldap,dc=server"
LDAP_TIMEOUT=15
LDAP_SSL=true
LDAP_TLS=false
LDAP_SASL=false
LDAP_ALLOWED_GROUP="CN=MIS,OU=Groups,DC=ldap,DC=server"
```
- Setup Database connection (Default: sqlite)
# Installation
## Docker-compose installation
- Build image with ```docker build -t open-signage/open-signage:latest```
- Edit "image" in docker-compose to your tagged image name
- Edit "environment" in docker-compose to your need
- ```sudo docker compose up```
- ```sudo docker ps``` and grab container id for open-signage-app
- ```sudo docker exec ID php artisan migrate```
- ```sudo docker exec ID php artisan db:seed```
## Updating
- sudo docker builder prune
- sudo docker compose up --force-recreate --build
## Install native
### Requirements
```
apt install php8.2 php8.2-imagick php8.2-mbstring php8.2-curl php8.2-ldap php8.2-bcmath
```
- php8.2
- npm
- composer
- php ldap extension
- php imagick extension
- ghostscript
- Replace imagick policy
```sed -ri -e 's/<policy domain="coder" rights="none" pattern="PDF" \/>/<policy domain="coder" rights="read|write" pattern="PDF" \/>/g' /etc/ImageMagick-6/policy.xml```
### Installation
- ```git clone https://github.com/bluecraank/open-signage```
- ```cd open-signage```
- ```composer install```
- ```npm install```
- ```npm run build```
- ```php artisan migrate --force```
- ```php artisan db:seed```
- ```php artisan serve``` (Not recommended)
- Use apache/nginx/caddy and configure root directory to ./public
## Words about reverse proxy
- If you use a reverse proxy to serve this app, set PROXY_URL in env file
```PROXY_URL="https://open-signage.company.com```
- Make sure your proxy expose real ip-address of client, so open-signage can recognize monitors and redirect them to correct presentation
## SSO
- Set enviroment variables
```
SSO_ENABLED=false
SSO_HTTP_HEADER_USER_KEY=HTTP_AUTH_USER
SSO_BYPASS_DOMAIN_VERIFICATION=false
```
## Deploy
- use FullPageOS <a href="https://github.com/guysoft/FullPageOS">https://github.com/guysoft/FullPageOS</a>
- or chromium parameters
```chromium --enable-logging --log-level=2 --v=0 --kiosk --touch-events=enabled --disable-pinch --noerrdialogs --simulate-outdated-no-au='Tue, 31 Dec 2099 23:59:59 GMT' --disable-session-crashed-bubble --disable-component-update --overscroll-history-navigation=0 --disable-features=Translate --autoplay-policy=no-user-gesture-required --app=https://mis.dc.local/discover```
### SSL Errors
- Add --ignore-certificate-errors to chromium flags (Not recommended)
- Add root-ca of your organization or domain
# License
The MIT License (MIT). Please see License File for more information.
| Digital signage - Server/Client, Schedules, Presentations (pdf) - built with Laravel and Bootstrap | javascript,laravel,php,signage,sqlite,browser,html5,web,digital,docker | 2023-09-11T20:46:46Z | 2024-04-24T07:19:39Z | 2024-04-19T08:16:40Z | 1 | 3 | 246 | 0 | 0 | 6 | null | MIT | PHP |
theshivam7/dot-batch-web-development | main | # dot-batch-web-development
<h2>MERN Stack Development Course (@Dot Batch) By Love Babbar Bhaiya</h2>
🌐 In this course, we are going to cover: -
- 🎨 HTML, CSS, JS basics
- 🌀 Styling with Tailwind CSS
- 🎬 Cool CSS Animations
- ⚙️ Advanced JS skills
- ⚛️ Full React apps
- 🏗️ Real projects x15
- 🚀 Backend with Node.js
- 🛠️ Build from scratch
Let's learn together 🚀🌟
| In this course, we are going to cover: - HTML, CSS, JS basics 🌀 Styling with Tailwind CSS, Cool CSS Animations, Advanced JS skills ⚛️, Full React apps , Real projects x15 🚀 Backend with Node.js 🛠️, Build from scratch Let's learn together 🚀🌟 | css,html,javascript,nodejs,react,tailwind-css,html5 | 2023-08-10T08:53:13Z | 2024-01-04T06:32:54Z | null | 1 | 0 | 110 | 0 | 1 | 6 | null | null | HTML |
yaohaixiao/dom.js | main | # dom.js
[](https://www.npmjs.com/package/@yaohaixiao/dom.js)
[](https://prettier.io)
[](https://codecov.io/gh/yaohaixiao/dom.js)
[](https://npmcharts.com/compare/@yaohaixiao/dom.js?minimal=true)
[](https://github.com/yaohaixiao/dom.js/blob/main/LICENSE)
dom.js - 专门处理 DOM 操作的 JavaScript 工具库。
## 项目初衷
dom.js 开发的目的是为初学 JavaScript 的朋友了解原生 JavaScript 中的 DOM 操作方法而写。源代码中 @see 属性给出了 MDN 中的 DOM API 接口的文档 URL 地址，希望初学的朋友们可以仔细阅读文档，了解其原理。从而能够摆脱对第三方框架的依赖，即使没有了框架，也能自如的通过 JavaScript 操作 DOM。
当然，dom.js 中提供的工具方法也是可以应用到实际的日常开发中的。
## Features
* 原生 JavaScript 纯手动打造，无任何依赖；
* 支持 UMD 和 ES6 模块规范，适应各种运行环境；
* 支持调用 DOM 整体模块和独立调用方法；
* 提供 100+ 实用的 DOM 操作方法，让你轻松应对日常开发的各种 DOM 应用场景；
## Browsers Support
| [<img src="https://raw.githubusercontent.com/alrra/browser-logos/master/src/edge/edge_48x48.png" alt="Edge" width="24px" height="24px" />](https://github.com/yaohaixiao/dom.js/)</br>Edge | [<img src="https://raw.githubusercontent.com/alrra/browser-logos/master/src/firefox/firefox_48x48.png" alt="Firefox" width="24px" height="24px" />](https://github.com/yaohaixiao/dom.js/)</br>Firefox | [<img src="https://raw.githubusercontent.com/alrra/browser-logos/master/src/chrome/chrome_48x48.png" alt="Chrome" width="24px" height="24px" />](https://github.com/yaohaixiao/dom.js/)</br>Chrome | [<img src="https://raw.githubusercontent.com/alrra/browser-logos/master/src/safari/safari_48x48.png" alt="Safari" width="24px" height="24px" />](https://github.com/yaohaixiao/dom.js/)</br>Safari | [<img src="https://raw.githubusercontent.com/alrra/browser-logos/master/src/opera/opera_48x48.png" alt="Opera" width="24px" height="24px" />](https://github.com/yaohaixiao/dom.js/)</br>Opera |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| Edge | last 10 versions | last 10 versions | last 10 versions | last 10 versions |
## Install
dom.js 支持 UMD 规范和 ES6 的模块调用方式，既可以在 Node.js 环境中使用 npm 安装，也可以在浏览器中使用 script 标签引入到页面。
### npm install
```sh
# install from npmjs.com
npm i -S @yaohaixiao/dom.js
# install from github.com
npm i -S @yaohaixiao/dom.js --registry=https://npm.pkg.github.com
```
### script tag
在浏览器中调用 dom.js，可以选择调用 jsdelivr 提供的 CDN 服务中的文件，也可以使用本地的 dom.js 文件。
#### CDN
```html
<script src="https://cdn.jsdelivr.net/gh/yaohaixiao/dom.js/dom.min.js"></script>
```
#### Local
```html
<script src="/path/to/dom.min.js"></script>
```
### UMD Module
```js
const DOM = require('@yaohaixiao/dom.js')
const $list = DOM.byId('#list')
```
### ES6 Module
```js
// Node.js 16 开始也支持 ES6 模块了，可以直接在 Node 环境中使用
import DOM from '@yaohaixiao/dom.js/dom'
// 调用单独的子模块, 模块中包含的具体方法请参考 API 文档中的导航分类
import DOM from '@yaohaixiao/dom.js/attributes'
import DOM from '@yaohaixiao/dom.js/base'
import DOM from '@yaohaixiao/dom.js/color'
import DOM from '@yaohaixiao/dom.js/insertion'
import DOM from '@yaohaixiao/dom.js/position'
import DOM from '@yaohaixiao/dom.js/sibling'
import DOM from '@yaohaixiao/dom.js/size'
import DOM from '@yaohaixiao/dom.js/style'
import DOM from '@yaohaixiao/dom.js/types'
// 单独调用某个方法
import getEl from '@yaohaixiao/dom.js/getEl'
const $list = DOM.byId('#list')
getEl('#list')
```
## Usage
dom.js 提供完整功能函数的 dom 模块，也支持单独调用某个功能方法：
```js
import DOM from '@yaohaixiao/dom.js/dom'
import next from '@yaohaixiao/dom.js/next'
import index from '@yaohaixiao/dom.js/index'
import createElement from '@yaohaixiao/dom.js/createElement'
// 获取 id = ‘list’ 的列表
const $list = DOM.byId('#list')
// 获取 $list 列表的下一个邻居（元素）节点
const $nextSibling = next($list)
// 给 $nextSibling 设置属性
DOM.setAttributes($nextSibling, {
id: 'list-next-sibling',
className: 'siblings',
'data-index': index($nextSibling)
})
const $anchor = createElement('a', {
className: 'anchor',
href: 'https://github.com/yaohaixiao/dom.js',
target: '_blank'
}, 'Fork on Github')
```
## API Documentation
API 文档地址：[https://yaohaixiao.github.io/dom.js/](https://yaohaixiao.github.io/dom.js/)
## License
JavaScript Code Licensed under [MIT License](http://opensource.org/licenses/mit-license.html).
API Documentation Licensed under [CC BY 3.0](http://creativecommons.org/licenses/by/3.0/)
| dom.js - 一个专门处理 DOM 相关操作的 JavaScript 工具方法库。 | dom,javascript,utils | 2023-09-04T08:41:00Z | 2024-05-15T01:29:52Z | 2024-04-30T05:25:07Z | 1 | 1 | 153 | 0 | 0 | 6 | null | MIT | JavaScript |
shillehbean/youtube-p2 | main | # Welcome to [MMShilleh's YouTube Channel](https://www.youtube.com/@mmshilleh/videos) README!
🌟 **Support My Work** 🌟
If you've found the code and tutorials on my channel helpful, consider supporting my work through these channels:
- ☕ [Donate on Buy Me A Coffee](https://www.buymeacoffee.com/app/dashboard) if my content saved you time or helped you in any way.
- 📆 For personalized assistance or consulting, [book a session with me](https://www.buymeacoffee.com/mmshilleh/e/194358). Let's dive deeper into your projects or challenges!
🔗 **Useful Links** 🔗
- 📺 [Subscribe to my YouTube channel](https://www.youtube.com/@mmshilleh/videos) for more helpful code tutorials and tech insights. Please like and subscribe if you find any of the content helpful!
- 📚 **Other Public Code Repository**: Access the code featured in earlier videos at [GitHub - shillehbean/youtube-p2](https://github.com/shillehbean/youtube-channel). This is another public repository where I share the code from my earlier tutorials.
🔒 **Exclusive Content** 🔒
- **Private Repository Access**: Starting from February 16, 2024, the code from my new videos will be shared exclusively through a private repository. Gain access by [subscribing to Perks Level One on my channel](https://www.youtube.com/channel/UCD13UWk3lJtjka7BoA0KZ5w/join).
- **Channel Membership Perks**: By joining my channel, not only do you get access to exclusive content, but you also enjoy several other phenomenal perks, including career support and in-depth responses. Check out the various tiers and benefits of becoming a channel member!
🌐 **Stay Connected** 🌐
Join our community of tech enthusiasts, developers, and learners. Together, we explore, create, and share knowledge to make technology accessible and fun for everyone.
Remember, your support fuels this journey and enables me to produce more content, code, and tutorials that help you and many others. Let's continue to learn and grow together!
Thank you for being part of our channel! 🙏
| Public code for my youtube channel (P2) | javascript,micropython,node,python,react | 2023-08-19T17:07:15Z | 2024-05-22T15:49:36Z | null | 1 | 0 | 26 | 0 | 2 | 6 | null | null | Python |
PRich57/weather-dash | main | # Weather Dash
## Description
Weather Dash aims to provide users with a free and easy-to-use weather application. The app will display the current weather and a 5-day forecast of any city the user would like to view. This web application was designed to maximize viewing comfort on mobile and desktop browsers.
View the 5-day forecast in any city, complete with average daily temperatures, high temperatures, wind speeds, and humidity.
The easily accessible search history list allows users to get updates on the weather in cities they've recently viewed without the need to search again.
To visit the Weather Dash application click [here!](https://prich57.github.io/weather-dashboard/)
## Installation
N/A
## Usage
To use Weather Dash, enter the name of a city to view the current weather and 5-day forecast for that city. The input field is not case-sensitive but requires the city's name to be spelled correctly to display the weather.
For each city searched, the Search History field will update with the most recent ten searches, beginning with the most recent at the top of the list. The user may click on any of the buttons in the search history list to display that city's weather again. When the user has searched more than ten times, the oldest search will be removed from the bottom of the list to maintain a maximum of 8 items in the search history at a time.
## Mock-Up
The following image shows Weather Dash's appearance and functionality.
## Credits
All weather data displayed is dynamically updated via the OpenWeatherMap API.
## License
TBD
| (Full-Stack) This weather application will display current weather data and the five-day forecast for the user designated city. This is a demonstration of API communication and manipulation of the data in a way that presents accurate information in an appealing, user-friendly design. | api,css,html,javascript | 2023-09-01T20:41:41Z | 2023-11-18T19:49:47Z | null | 1 | 0 | 34 | 0 | 0 | 6 | null | null | JavaScript |
sondosaabed/Tasks-list-Managment-System | main | # Tasks List:
In this project, a tasks management system is developed using Laravel framework. This project is part of Laravel 10 course work and E Microlearn Summer Internship.
# Demo
## About Laravel
Laravel is a web application framework with expressive, elegant syntax. We believe development must be an enjoyable and creative experience to be truly fulfilling. Laravel takes the pain out of development by easing common tasks used in many web project.
<p align="center"><a href="https://laravel.com" target="_blank"><img src="https://raw.githubusercontent.com/laravel/art/master/logo-lockup/5%20SVG/2%20CMYK/1%20Full%20Color/laravel-logolockup-cmyk-red.svg" width="400" alt="Laravel Logo"></a></p>
| A Tasks Managment System using Laravel. E Micro Learn Summer Internship | blade-template,html,javascript,laravel-framework,php,database-seeding,migrations,mvc-architecture,routing | 2023-08-20T15:27:29Z | 2023-09-20T22:18:33Z | null | 1 | 0 | 46 | 0 | 0 | 6 | null | null | PHP |
Shahriyar-Hosen/React-Accordions | main | <h1 align="center">React-Accordions</h1>
**A Next-Level Accordion Component Using Pure React**
https://github.com/Shahriyar-Hosen/React-Accordions/assets/96829173/0d8622ea-2a75-49b9-8885-1cd1cde84023
| A Next-Level Accordion Component Using Pure React | css,css3,javascript,js,react,reactts,ts,typescript | 2023-08-13T05:57:46Z | 2023-08-13T08:01:46Z | null | 1 | 3 | 25 | 0 | 1 | 6 | null | null | TypeScript |
amankushwaha577/GoogleSearch | main | # ``` GOOGLE SEARCH ```
I'm thrilled to present my latest project GoogleSearch, A Fully responsive Google clone single-page application using React.js, Tailwind CSS, and the Google Custom Search API. Leveraging advanced technologies, I utilized React.js for building the frontend, Tailwind CSS for elegant styling, and integrated the Google Custom Search API for real-time search results. This project showcased my proficiency in fundamental React.js concepts, including JSX, components, props, state management, lifecycle methods, conditional rendering, lists with keys, and the Context API.
-  `1. Fetching Data from Google Custom Search API: To implement clone functional, I have Implemented logic to fetch search results from the Google Custom Search API. We need an API key and the API endpoint. Use fetch or a library like Axios to make HTTP requests.`
-  `2.Created the User Interface: Designed a visually appealing and responsive user interface using Tailwind CSS. Tailwind's utility classes make it easy to create a modern and clean look. `
-  `3. Context API: If your application becomes more complex and you need to share state between components that are not directly connected, you can use React's Context API for state management.`
-  `4. Demonstrated proficiency in core React.js concepts, including components, props, and state management.`
-  `5. Utilized React's lifecycle methods to optimize application performance.`
-  `6. Employed conditional rendering for a seamless user experience.`
-  `7. Effectively managed lists and keys to render dynamic content.`
<br><br>
# LANGUAGES, FRAMEWORKS, LIBRARY AND DATABASE
-  `REACT.js`
-  `Tailwind CSS`
-  `Google Custom Search API`
-  `HTML5, CSS3 and Bootstrap4`
-  `VIT`
-  `JavaScript`
<br>
# ONLINE REACHABILITY:
TECHNICAL SIDES OF FRIEND'S SPY
```sh
1. Utilized React.js to create a responsive and dynamic single-page application.
2. Implemented JSX for rendering components and user interface elements.
3. Designed an elegant and modern user interface using Tailwind CSS.
4. Successfully integrated the Google Custom Search API to fetch real-time search results.
```
<br>
<br>
License
----
@Copyright Google Search 2022
| REACT + TAILWIND + VITE + GOOGLE CUSTOM SEARCH API + JAVASCRIPT + HTML AND CSS | api,custom,google,javascript,tailwindcss | 2023-09-01T19:01:43Z | 2023-10-16T17:44:51Z | null | 1 | 0 | 8 | 1 | 0 | 6 | null | null | JavaScript |
Hashuudev/United-Elite-Group | main | # United-Elite-Group
Welcome to the United Elite Group GitHub repository! Your ultimate destination for all things related to solar energy, engineering, construction, and visionary real estate services. At United Elite Group, we harness the boundless energy of the sun, sculpt innovation with precision, and craft inspiring spaces that define the very essence of the future. Join us on this transformative journey as we turn possibilities into tangible realities.
# About
United Elite Group has been a prominent player in the field of engineering since 2015. We are more than just an organization; we are a specialized collective of professionals who channel their boundless creativity, unwavering innovation, and technical expertise to conquer engineering challenges and forge unparalleled solutions. Going beyond the boundaries of traditional engineering practices, we seamlessly integrate artistic flair, timeless design principles, and pioneering approaches to conquer problems and create marvels. Our mission goes beyond mere tasks; we infuse every project with Energy, Vitality, and Spirit, instilling life and purpose into every endeavor. Our actions speak louder than words as we relentlessly pursue excellence to deliver remarkable results for our esteemed clients. (Updated)
# Technology-Used
* HTML
* CSS
* JavaScript
* Bootstrap
* SCSS
* PHP
* VenoBox ( Library )
* Wow & Way Point ( Library )
* Parallax ( Library )
* Slick ( Library )
* Animate CSS ( Library )
* Images Loaded ( Library )
# Screenshot
| United Elite Group ✨: Empowering through innovation since 2015. Energizing solar, engineering, construction, and real estate solutions with creativity and technical expertise. | bootstrap,company-profile,company-site,css,engineer-enterprises,engineering-services,front-end-development,html,javascript,jquery | 2023-08-23T19:10:55Z | 2023-10-05T17:45:28Z | null | 1 | 0 | 17 | 0 | 0 | 6 | null | null | HTML |
amankushwaha577/Youtube-Clone | main | # ``` Y0UTube ```
The project involves the development of a web application that emulates the core features of YouTube, one of the most popular video-sharing platforms. This YouTube clone will allow users to search, view, and interact with videos through a user-friendly interface built with React, styled with Tailwind CSS, and powered by the YouTube Data API obtained from Rapid API.
-  `Developed a functional YouTube clone with core features such as video search, video playback, Annotation, Playback speed, CC, Quality size`
-  `Created a visually appealing and responsive user interface using Tailwind CSS.`
-  `Integrated the Rapid API's YouTube Data API for fetching video data.`
-  `To allow users to interact with videos through likes, dislikes, and comments.`
<br><br>
# LANGUAGES, FRAMEWORKS, LIBRARY AND DATABASE
-  `REACT.js`
-  `Tailwind`
-  `Rapid API`
-  `Java Script`
-  `HTML5, CSS3 and Bootstrap4`
<br>
# ONLINE REACHABILITY:
TECHNICAL SIDES
```sh
1. React: JavaScript library for building user interfaces.
2. Tailwind CSS: A utility-first CSS framework for creating stylish and responsive designs.
3. Rapid API: A platform for accessing various APIs, including the YouTube Data API.
```
<br>
<br>
License
----
@Copyright YOUTube Clone By Aman Kushwaha 2022
| REACT + TAILWIND + RAPID API + JAVASCRIPT + HTML AND CSS | html-css-javascript,javascript,rapidapi,react,tailwindcss | 2023-08-31T18:11:29Z | 2023-10-17T16:48:07Z | null | 1 | 0 | 19 | 3 | 0 | 6 | null | null | JavaScript |
Gwyd0/Sparx-bwk-extention | main | # Sparx Bwk
**Note: This project is not being maintained anymore**
**Sparx-Bookwork-Code (Sparx-BWK)** is a project I've been working on for about a year (mostly as a hobby and because I'm lazy).
It's a Firefox extension to log Bookwork codes for Sparx and auto completes Bookwork checks (explained [here](https://support.sparx.co.uk/docs/what-are-bookwork-checks)). Its original design was a web scraper using Chrome driver to log bookwork codes and auto complete bookwork checks. The original code is [here](https://github.com/Gwyd0/Sparx-bwk). This newer version is not only more efficient but easier to install as it is a web browser extension rather than a web scraper.
Having it here may help anybody who wants to somewhat automate their Sparx maths homework. (or just hates writing bookwork codes)
| I got tired of doing maths homework. | cheats,chrome-extension,homework,homework-helper,javascript,sparx-maths,sparxmaths,sparxmaths-solver | 2023-08-25T14:18:10Z | 2024-04-19T15:27:41Z | null | 1 | 0 | 21 | 0 | 2 | 5 | null | MPL-2.0 | JavaScript |
themesberg/tailwind-qwik-starter | main | # Tailwind CSS starter project with Qwik and Flowbite
This repository is a free and open-source starter project that has Tailwind CSS, Flowbite, and Qwik preconfigured so you can instantly leverage the utility-first classes from Tailwind CSS, the UI components from Flowbite and the framework structure from Qwik.
A guide has been published on the [Flowbite Documentation](https://flowbite.com/docs/getting-started/qwik/) for more information.
---
## Project Structure
This project is using Qwik with [QwikCity](https://qwik.builder.io/qwikcity/overview/). QwikCity is just an extra set of tools on top of Qwik to make it easier to build a full site, including directory-based routing, layouts, and more.
Inside your project, you'll see the following directory structure:
```
├── public/
│ └── ...
└── src/
├── components/
│ └── ...
└── routes/
└── ...
```
- `src/routes`: Provides the directory-based routing, which can include a hierarchy of `layout.tsx` layout files, and an `index.tsx` file as the page. Additionally, `index.ts` files are endpoints. Please see the [routing docs](https://qwik.builder.io/qwikcity/routing/overview/) for more info.
- `src/components`: Recommended directory for components.
- `public`: Any static assets, like images, can be placed in the public directory. Please see the [Vite public directory](https://vitejs.dev/guide/assets.html#the-public-directory) for more info.
## Add Integrations and deployment
Use the `npm run qwik add` command to add additional integrations. Some examples of integrations includes: Cloudflare, Netlify or Express Server, and the [Static Site Generator (SSG)](https://qwik.builder.io/qwikcity/guides/static-site-generation/).
```shell
npm run qwik add # or `yarn qwik add`
```
## Development
Development mode uses [Vite's development server](https://vitejs.dev/). The `dev` command will server-side render (SSR) the output during development.
```shell
npm start # or `yarn start`
```
> Note: during dev mode, Vite may request a significant number of `.js` files. This does not represent a Qwik production build.
## Preview
The preview command will create a production build of the client modules, a production build of `src/entry.preview.tsx`, and run a local server. The preview server is only for convenience to preview a production build locally and should not be used as a production server.
```shell
npm run preview # or `yarn preview`
```
## Production
The production build will generate client and server modules by running both client and server build commands. The build command will use Typescript to run a type check on the source code.
```shell
npm run build # or `yarn build`
```
| Open-source starter project for Qwik, Tailwind CSS, and Flowbite | flowbite,qwik,qwik-framework,starter,starter-kit,starter-project,starter-template,tailwind,ui-components,css | 2023-08-16T09:34:18Z | 2023-11-10T11:07:09Z | null | 2 | 0 | 8 | 0 | 3 | 5 | null | MIT | TypeScript |
jordanpapaditsas/okonomi-flavors | main | # Okonomi-Flavors
## Description
Okonomi Flavors is a dynamic Japanese restaurant web app, built using HTML, CSS, and JavaScript. It is developed with the Webpack module bundler to create an interactive user experience. The web app features a home page, a menu page, a contact us form with validation, and local storage to store form submissions as JSON objects.
## Live Preview
**https://jordanpapaditsas.github.io/okonomi-flavors/**
## Screenshots Preview
### **Large Screens:**
Home page: 
Menu page: 
Contact page: 
### **Small Screens:**
## Features
- Menu Page: The website provides a dynamic menu page that displays various Japanese dishes with images, descriptions, and prices.
- Interactive Navigation: Users can easily navigate between the home, menu, and contact us pages using interactive navigation buttons.
- Contact Us Form: The contact us page includes a form with client-side validation for name, email, and message fields.
- Local Storage: Form submissions are stored locally in JSON format, allowing users to review their past inquiries.
- Dynamic Hamburger Menu: Pops up a hamburger menu, under specific screen sizes.
- Responsive Design: The website is designed to be responsive on various screen sizes and devices.
- Webpack Integration: Webpack is used for module bundling, optimizing assets, and keep organized the code structure.
## How To Install
1.Clone the repository:
```md
git clone https://github.com/jordanpapaditsas/okonomi-flavors.git
```
2.Navigate to the clone project directory:
```md
cd okonomi-flavors
```
3.Install Node.js and npm (donwload and install from https://nodejs.org/en)
4.Install Project Dependencies
```md
npm install
```
5.Build the project
```md
npm run build
```
6.Watch for changes during development
```md
npm run watch
```
## Contributing
All contributions are accepted! If you'd like to contribute, please follow these steps:
1. Fork this repository to your GitHub account.
2. Create a new branch for your feature or bug fix: `git checkout -b feature/your-feature-name`
3. Make your changes and commit them with descriptive commit messages.
4. Push your changes to your forked repository.
5. Create a pull request to the `main` branch of this repository, describing your changes.
## License
This project is licensed under the [MIT License](LICENSE).
| Interactive Japanese restaurant web app, developed with JavaScript using Webpack module bundler. | javascript,dom-manipulation,npm,npm-package,webpack,modules,es6modules,eventlisteners,json | 2023-09-01T15:44:10Z | 2023-10-23T11:45:22Z | null | 1 | 0 | 82 | 0 | 0 | 5 | null | MIT | JavaScript |
shaneyoung91/digital-payment-app | main | # MoneySpread - A Digital Payment Application
- Leveraged Python, Django, and PostgreSQL to build a feature-rich digital payments application, similar to Venmo, CashApp, and Zelle.
- Demonstrated knowledge of Django by creating dynamic views and managing complex data models for seamless application functionality.
- Ensured a seamless user experience by integrating essential banking features, such as account management, fund transfers, and transaction history.
## Link to App :link:
[MoneySpread](https://moneyspread-259abb181ed5.herokuapp.com/)
---
## User Dashboard
---
## Account Detail
---
## Credit Card Details
---
## Deposits Funds to Card
---
## Withdraw Funds from Card
---
## Request Payment from Users
---
## Confirm Payment
---
## Transactions
---
## Transaction Detail
---
## Code Preview
```python
class CreditCard(models.Model):
user = models.ForeignKey(User, on_delete=models.CASCADE)
card_id = ShortUUIDField(unique=True, length=5, max_length=20, prefix="CARD", alphabet="1234567890")
name = models.CharField(max_length=100)
card_number = models.PositiveBigIntegerField()
month = models.IntegerField()
year = models.IntegerField()
cvv = models.IntegerField()
amount = models.DecimalField(max_digits=12, decimal_places=2, default=0.00)
card_type = models.CharField(choices=CARD_TYPE, max_length=50, default="Mastercard")
card_status = models.BooleanField(default=True)
date = models.DateTimeField(auto_now_add=True)
def __str__(self):
return f"{self.user}"
```
---
## Technologies Used
<br>
<br>
---
## Future Enhancements
- [ ] Search bar feature on dashboard to find user accounts
- [ ] Notification system when requests/transfers are made and their status updates
- [ ] Exchange rate feature for other currencies
- [ ] Updated dashboard featuring recent transactions
---
| Digital payment application to send and receive money. Faux-Venmo, Zelle, CashApp. | django,javascript,python,banking,finance,fintech,side-project,aws-s3,heroku-deployment,postgresql | 2023-09-11T18:42:02Z | 2023-10-05T20:20:51Z | null | 1 | 0 | 76 | 0 | 0 | 5 | null | null | JavaScript |
fatmahussein/space-travellers-hub | dev | # Space_TravellersHub
<a name="readme-top"></a>
# 📗 Table of Contents
- [Space_TravellersHub](#Space_TravellersHub)
- [📗 Table of Contents](#-table-of-contents)
- [📖 Space_TravellersHub< ](#Space_TravellersHub)
- [🚀 Live Demo ](#-live-demo-)
- [🛠 Built With HTML, CSS and JavaScript](#-built-with-html-css-and-javascript)
- [Tech Stack ](#tech-stack-)
- [Key Features ](#key-features-)
- [💻 Getting Started ](#-getting-started-)
- [Prerequisites](#prerequisites)
- [Setup](#setup)
- [reactSetup](reactSetup.md)
- [Install](#install)
- [👥 Authors ](#-authors-)
- [🔭 Future Features ](#-future-features-)
- [🤝 Contributing ](#-contributing-)
- [⭐️ Show your support ](#️-show-your-support-)
- [🙏 Acknowledgments ](#-acknowledgments-)
- [❓ FAQ ](#-faq-)
- [📝 License ](#-license-)
# 📖 Space_TravellersHub< <a name="about-project"></a>
**Space_TravellersHub<e**
In this task, we worked with the real live data from the SpaceX API. Our task was to build a web application for a company that provides commercial and scientific space travel services. The application allows users to book rockets, and dragons and join selected space missions
## 🚀 Live Demo <a name="live-demo"></a>
- [Live Demo](https://space-travellers-hub2023.netlify.app/)
## 🛠 Built With <a name="built-with">React and Redux</a>
### Tech Stack <a name="tech-stack"></a>
<ul>
<li><a href="https://developer.mozilla.org/ru/docs/Web/HTML">HTML</a></li>
<li><a href="https://developer.mozilla.org/ru/docs/Web/CSS">CSS</a></li>
<li><a href="https://developer.mozilla.org/ru/docs/Web/JavaScript">JavaScript</a></li>
<li><a href="https://eslint.org/">Eslint</a></li>
<li><a href="https://stylelint.io/">stylelint</a></li>
<li><a href="https://create-react-app.dev/">React</a></li>
</ul>
### Key Features <a name="key-features">
</a>
- [html](https://developer.mozilla.org/ru/docs/Web/HTML)
- [AJAX](https://www.w3schools.com/xml/ajax_intro.asp)
- [JS](https://developer.mozilla.org/ru/docs/Web/JavaScript)
- [CSS](https://developer.mozilla.org/ru/docs/Web/CSS)
- [yarn](https://classic.yarnpkg.com/lang/en/docs/install/#windows-stable)
- [React](https://create-react-app.dev/)
- [Eslint](https://eslint.org/)
- [stylelint](https://stylelint.io/)
- [JSX](https://legacy.reactjs.org/docs/introducing-jsx.html)
- [vite](https://vitejs.dev/guide/)
<p align="right">(<a href="#readme-top">back to top</a>)</p>
<p align="right">(<a href="#readme-top">back to top</a>)</p>
## 💻 Getting Started <a name="getting-started"></a>
To get a local copy up and running, follow these steps:
- Open your Terminal in your VSCode.
- Navigate to the desired directory[folder] to which you want to clone the repository to
- [Copy & Paste] git clone you find in the code button https://github.com/fatmahussein/space-travellers-hub.git
### Prerequisites
In order to run this project you need:
- General Understanding of HTML & CSS
- basic Knowledge of Git Commands
- basic Knowledge of the Terminal Commands
- General Understanding of [bundling](https://youtu.be/5IG4UmULyoA) and [webpack](https://youtu.be/IZGNcSuwBZs)
### Setup
Clone this repository to your desired folder:
- git clone https://github.com/fatmahussein/space-travellers-hub.git
Example commands:
```sh
cd my-folder
git clone https://github.com/fatmahussein/space-travellers-hub.git
```
--->
### React setup
open [this](reactSetup.md) readme file detailed steps
### Install
Must-Install-Project-with-the-Following-Programmes:
- [Prettier](https://marketplace.visualstudio.com/items?itemName=esbenp.prettier-vscode) Extention in VScode
- [Git](https://git-scm.com/downloads)
- [Node.js](https://nodejs.org/en/download)
- [yarn install](https://classic.yarnpkg.com/lang/en/docs/install/#windows-stable)
- [React](https://create-react-app.dev/)
- [Eslint](https://eslint.org/)
- [stylelint](https://stylelint.io/)
<p align="right">(<a href="#readme-top">back to top</a>)</p>
## 👥 Authors <a name="authors"></a>
👤 **GeekyHacks**
- GitHub: [Geekyhacks](https://github.com/GeekyHacks)
- Twitter: [Geekydart](https://twitter.com/GeekyDart)
- LinkedIn: [Abdullah Nasser](https://www.linkedin.com/in/abdullah-nasser-711625268/)
👤 **Fatuma Hussein**
- GitHub: [@fatmahussein](https://github.com/fatmahussein)
- Twitter: [@FatmaHussein200](https://twitter.com/@FatmaHussein200)
- LinkedIn: [FatumaHussein](https://www.linkedin.com/in/fatuma-hussein-48149917b)
## 🔭 Future Features <a name="future-features"></a>
- Adding webpack
<p align="right">(<a href="#readme-top">back to top</a>)</p>
## 🤝 Contributing <a name="contributing"></a>
Contributions, issues, and feature requests are welcome!
Feel free to check the [issues page](https://github.com/fatmahussein/space-travellers-hub/issues).
<p align="right">(<a href="#readme-top">back to top</a>)</p>
## ⭐️ Show your support <a name="support"></a>
If you like this project please don't hesitate to support me with your valued contribution and don't forget to star the repo to reach more
people.
<p align="right">(<a href="#readme-top">back to top</a>)</p>
## 🙏 Acknowledgments <a name="acknowledgements"></a>
I would like to thank...
- Microverse Review Team
- Microverse Community in Slack
- my Mentor @Strangeal
- my coding partner @fatmahussein @firepicaso@GeekyHacks
<p align="right">(<a href="#readme-top">back to top</a>)</p>
## ❓ FAQ <a name="faq"></a>
Can I clone this project ?\*\*
- Of course you can as long as you fork it and star it
Can I contribute to this project?\*\*
- definitely you can
<p align="right">(<a href="#readme-top">back to top</a>)</p>
## 📝 License <a name="license"></a>
This project is [MIT](LICENSE) licensed.
<p align="right">(<a href="#readme-top">back to top</a>)</p>
| A web application for a company that provides commercial and scientific space travel services. The application allows users to book rockets,dragons and join selected space missions. | css,html,javascript,react,reactjs,microverse,microverse-projects,redux,redux-toolkit | 2023-09-04T08:12:37Z | 2024-01-14T10:17:58Z | null | 3 | 12 | 111 | 24 | 1 | 5 | null | MIT | JavaScript |
brainbarett/suriel | master | # Suriel
📦 Asset manager for business' to keep track of and manage their company assets. It currently in its early stages; not production ready.
| 📦 Asset Manager for business' to keep track of and manage their company assets. | cms,express,nodejs,javascript,tdd,tdd-node,sequelize,umzug,typescript,tdd-express | 2023-09-04T22:53:55Z | 2023-09-14T00:28:37Z | null | 1 | 0 | 44 | 0 | 0 | 5 | null | MIT | TypeScript |
Zilola-Nazarova/harry-potter-characters | dev | <h3 align="center"><b>Harry Potter Library</b></h3>
<p align="center">Harry Potter Library is a site that lists down main Harry Potter characters with the corresponding data. Webapp retrieves data from hp-api.onrender.com API. Built with React.</p>
<a name="readme-top"></a>
# 📗 Table of Contents
- [📖 About the Project](#about-project)
- [🛠 Built With](#built-with)
- [Tech Stack](#tech-stack)
- [Key Features](#key-features)
- [🚀 Live Demo](#live-demo)
- [💻 Getting Started](#getting-started)
- [Setup](#setup)
- [Prerequisites](#prerequisites)
- [Install](#install)
- [Usage](#usage)
- [Run tests](#run-tests)
- [Deployment](#triangular_flag_on_post-deployment)
- [👥 Authors](#authors)
- [🔭 Future Features](#future-features)
- [🤝 Contributing](#contributing)
- [⭐️ Show your support](#support)
- [🙏 Acknowledgements](#acknowledgements)
- [❓ FAQ (OPTIONAL)](#faq)
- [📝 License](#license)
# 📖 "Mountains Forecast" <a name="about-project"></a>
**Harry Potter Library** is a site that lists down main Harry Potter characters with the following data:
- Name
- House
- Alive/Not alive
- Character's portrait
When a character is selected, more data about this character
is displayed such as:
- Wand properties
- Patronus animal
- Date of birth
- Ancestry, etc.
The home page has a search bar where you can type your character's name to find the information faster.
## 🛠 Built With <a name="built-with"></a>
### Tech Stack <a name="tech-stack"></a>
<details>
<summary>Client</summary>
<ul>
<li><a href="https://developer.mozilla.org/ru/docs/Web/HTML">HTML</a></li>
<li><a href="https://developer.mozilla.org/ru/docs/Web/CSS">CSS</a></li>
<li><a href="https://developer.mozilla.org/ru/docs/Web/JavaScript">JavaScript</a></li>
<li><a href="https://react.dev/">React</a></li>
<li><a href="https://redux-toolkit.js.org/">Redux</a></li>
</ul>
<summary>Server</summary>
<ul>
<a href="https://render.com/">Render.com</a>
</ul>
</details>
### Key Features <a name="key-features"></a>
- **search for a particular Harry Potter character**
- **see detailed information about each character**
<p align="right">(<a href="#readme-top">back to top</a>)</p>
## 🚀 Live Demo <a name="live-demo"></a>
- Visit this link to see this project: https://harry-potter-characters.onrender.com/
<p align="right">(<a href="#readme-top">back to top</a>)</p>
## 💻 Getting Started <a name="getting-started"></a>
To get a local copy up and running, follow these steps.
### Prerequisites
To run and modify this project you need:
- GitHub account;
- git installed on your OS;
- VSCode (or another code editor);
- modern browser (supporting HTML5 and CSS3) is highly recommended;
- [Node.js and npm](https://nodejs.org/) installed;
### Setup
Login to your GitHub account. Clone this repository to your desired folder:
> cd my-folder
> git clone git@github.com:Zilola-Nazarova/harry-potter-characters.git
### Install
This project was bootstrapped with Vite and React.
To install all dependencies run the following command:
> npm install
### Usage
You can use this project to get weather and forecast data for mountain peaks located in Uzbekistan
You can also edit the code in your code editor and see the output. To run the app in the development mode:
> npm run dev
Open [http://localhost:3000](http://localhost:3000) to view it in your browser.
The page will reload when you make changes.
You may also see any linter errors in the console.
### Run tests
There are tests using libraries(React Testing Library and Jest).
To launch the test runner in the interactive watch mode:
> npm test
You can also check linter errors by running these commands:
> npx stylelint "**/*.{css,scss}"<br />
> npx eslint "**/*.{js,jsx}"
### Deployment
To build the app for production to the `build` folder.
> npm run build
It correctly bundles React in production mode and optimizes the build for the best performance.
The build is minified and the filenames include the hashes.
Your app is ready to be deployed!
<p align="right">(<a href="#readme-top">back to top</a>)</p>
## 👥 Authors <a name="authors"></a>
👤 Zilola Nazarova
- GitHub: [@Zilola-Nazarova](https://github.com/Zilola-Nazarova)
- Twitter: [@NazarovaZi](https://twitter.com/NazarovaZi)
- LinkedIn: [in/NazarovaZi](https://www.linkedin.com/in/zilola-nazarova)
<p align="right">(<a href="#readme-top">back to top</a>)</p>
## 🔭 Future Features <a name="future-features"></a>
- [ ] desktop version design;
<p align="right">(<a href="#readme-top">back to top</a>)</p>
## 🤝 Contributing <a name="contributing"></a>
Contributions, issues, and feature requests are welcomed!
<p align="right">(<a href="#readme-top">back to top</a>)</p>
## ⭐️ Show your support <a name="support"></a>
If you like this project just star it!
<p align="right">(<a href="#readme-top">back to top</a>)</p>
## 🙏 Acknowledgments <a name="acknowledgements"></a>
- Harry Potter characters information by <a target="_blank" href="https://hp-api.onrender.com/">hp-api.onrender.com</a> API
- Original design idea by <a target="_blank" href="https://www.behance.net/sakwadesignstudio">Nelson Sakwa</a>
I would like to thank the Microverse program for the knowledge and skills I have acquired in Modules 1, 2 and 3.
I am grateful to all previous project reviewers for their advice. Thanks to them I could build this app.
<p align="right">(<a href="#readme-top">back to top</a>)</p>
## ❓ FAQ <a name="faq"></a>
<p align="right">(<a href="#readme-top">back to top</a>)</p>
## 📝 License <a name="license"></a>
This project is [MIT](./MIT.md) licensed.
<p align="right">(<a href="#readme-top">back to top</a>)</p>
| Harry Potter Library lists down main Harry Potter characters. Users can search and select a character to get detailed information. The data is retrieved from 'hp-api' API. Built with React. | fetch-api,javascript,react,redux | 2023-09-03T17:45:05Z | 2023-09-14T18:32:41Z | null | 1 | 3 | 93 | 1 | 0 | 5 | null | null | JavaScript |
Prathameshgujjeti/Prathamesh-Gujjeti-Portfolio | master | # Prathamesh-Gujjeti-Portfolio
https://prathameshgujjeti.github.io/Prathamesh-Gujjeti-Portfolio
| Responsive Personal Portfolio Website Using HTML CSS & JavaScript | css,javascript,responsive-portfolio-website,html,portfolio-website | 2023-09-03T07:24:17Z | 2023-09-11T17:27:45Z | null | 1 | 0 | 9 | 0 | 0 | 5 | null | null | CSS |
Manikantkr-1004/RecipeSwap | main | # Recipe Swap
Recipe Swap is a community-based recipe sharing platform that allows users to share, discover, and discuss various recipes. Whether you're a cooking enthusiast or just looking for new culinary ideas, Recipe Swap provides a platform to connect and exchange recipes with others.
## Table of Contents
- [Features](#features)
- [Tech Stack](#Tech-stack)
- [Project Links](#Project-links)
- [Screenshot](#Screenshot)
- [Installation](#installation)
- [Project Memebers](#Project-team)
## Features
- User Authentication with Forgot Password.
- Users can post, add, update, and delete their recipes.
- Users can comment on recipe posts, fostering a sense of community and sharing.
- Users can easily search for recipes based on their preferences.
- User can also able update the avatar.
- Admin has access to data visualization in chart format for insights.
- Admin can manage users and recipes, including adding, updating, and deleting data.
## Tech Stack
- Front-end:
- Chakra UI for a visually appealing and responsive user interface.
- React.js for building dynamic and interactive components.
- Back-end:
- MongoDB for storing recipe and user data.
- Express.js for handling server-side logic.
- Node.js for server-side scripting and runtime environment.
## Project Links
# Front-end:
- **User Side:** [https://recipeswap.netlify.app](https://recipeswap.netlify.app/)
- **Admin Side:** [https://recipeswap.netlify.app/admin](https://recipeswap.netlify.app/admin)
- **Admin Login:** Email: admin@admin.com | Password: admin
# Back-end:
- **Server:** [https://recipeswap.onrender.com](https://recipeswap.onrender.com/)
## Screenshot
### User Side:
### Admin Side:
## Installation
To set up the project locally, follow these steps:
1. Clone the repository:
```bash
git clone https://github.com/Manikantkr-1004/warlike-current-5989.git
```
```bash
cd warlike-current-5989/Frontend
```
run command in terminal
```
npm install
```
run project
```
npm start
```
## Project Team
- [Manikant Kumar](https://github.com/Manikantkr-1004)
- [Mohammad Hasim Shaikh](https://github.com/Hasims2001)
- [Devesh Suryanwanshi](https://github.com/DeveshSuryawanshi)
- [Shivansh Soni](https://github.com/official-Shivansh)
Feel free to explore the project using the provided links and discover the world of recipes and culinary creativity!
| Recipe Swap is a community-based recipe sharing platform that allows users to share, discover, and discuss various recipes. Whether you're a cooking enthusiast or just looking for new culinary ideas, Recipe Swap provides a platform to connect and exchange recipes with others. | chakra-ui,css,expressjs,html,javascript,mongodb,nodejs,react,redux | 2023-08-21T16:54:21Z | 2023-12-08T13:14:21Z | null | 4 | 45 | 118 | 0 | 6 | 5 | null | null | JavaScript |
w4rCode/Gerador_de_Cores | main | # Gerador-de-Cores
Gerador de Paletas de cores
| Gerador de Paletas de cores | css,html,javascript,ui-design | 2023-08-10T17:46:51Z | 2023-08-11T14:40:37Z | null | 1 | 0 | 2 | 0 | 0 | 5 | null | null | CSS |
geniusuraj/IntervuAi | main | # IntervuAi - AI-Powered Interview Mastery Platform
## Description
IntervuAi is an AI-powered platform designed to help students practice for job interviews. Utilizing the OpenAI API, it simulates realistic interview scenarios, provides personalized feedback, and offers valuable insights to improve interview skills.
## Tech Stack
- React with TypeScript (Frontend)
- Tailwind CSS (Styling)
- OpenAI API (AI Integration)
- Java Spring Boot (Backend)
- MySQL (Database)
## Prerequisites
- NodeJS
- npm or yarn
- Java 8 or higher
- MySQL Server
## Installation
```bash
https://github.com/geniusuraj/IntervuAi.git
cd IntervuAi
# Frontend setup
cd frontend
npm install
npm start
# Backend setup
# Navigate to the backend directory
# Update MySQL credentials in `application.properties`
# Build and run the Spring Boot project
```
## Spring Boot Project Configuration
Add the following lines to your `application.properties` file to configure the Spring Boot backend:
```base
server.port = 5050
spring.datasource.driver=com.mysql.cj.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/your-database-name
spring.datasource.username= Your Username
spring.datasource.password= Your Password
spring.jpa.hibernate.ddl-auto=update
```
## Usage
- Choose the type of interview (MERN, Node, Java).
- Interact with the AI-based interviewer.
- Receive instant feedback.
## Team Members
- [Suraj Kumar Sharma](https://github.com/geniusuraj)
- [Rutwik Kumbhar](https://github.com/fw23-0277)
- [Moumita Sarkar](https://github.com/MouS0926)
- [Ramanjeet Singh](https://github.com/gzbsingh)
- [Mohnish Vishwakarma](https://github.com/mohnish201)
## Hackathon Rules
- All work is original.
- Followed the Code of Conduct.
- A live demo video is available.
## Entity-Relationship Diagram
| IntervuAi is your AI-powered interview coach. Practice job interviews, get instant feedback, and hone your skills in tech domains like MERN and Node. Built with React and Tailwind CSS, it's designed for a seamless prep experience. | html,java,javacore,javascript,jwt-authentication,react,spring-boot,typescript,tailwindcss | 2023-08-31T10:38:57Z | 2023-09-19T17:12:06Z | null | 5 | 18 | 68 | 0 | 3 | 5 | null | null | TypeScript |
naumanch969/codegem | main | # Codegem
Codegem is a social media platform targeted specifically for programmers, providing a dedicated space to share code snippets, maintain code streaks, collaborate on projects, and connect with like-minded individuals. Whether you're an expert or just starting, Codegem offers comprehensive features to enhance your coding experience.
## Table of Contents
- [🤖 Introduction](#-introduction)
- [⚙️ Tech Stack](#️-tech-stack)
- [🔋 Features](#-features)
- [🤸 Quick Start](#-quick-start)
- [🕸️ Snippets](#️-snippets)
- [🔗 Links](#-links)
- [🚀 More](#-more)
## 🤖 Introduction
Codegem is a social media platform specifically targeted to programmers. They can post their code snippets, maintain code streaks, collaborate on projects, and connect with friends and groups.
## ⚙️ Tech Stack
- React
- TypeScript
- Node.js
- Express
- MongoDB
- Stripe
- Material-UI
- Tailwind CSS
## 🔋 Features
- **Code Snippets:** Share code snippets with the community.
- **Code Streaks:** Track your coding progress with streaks.
- **Project Collaboration:** Collaborate on coding projects with friends.
- **Collections:** Organize code snippets into collections.
- **Groups:** Join or create groups based on interests.
- **Messaging:** Engage in real-time conversations.
- **Notifications:** Stay updated with notifications.
- **Profile Optimization:** Customize your profile.
- **Friend Discovery:** Find friends with similar interests.
- **Suggested Friends:** Discover new connections.
- **Premium Features:** Unlock additional features with premium plans.
## 🤸 Quick Start
1. Clone the repository.
2. Navigate to `/client` and run `npm install`.
3. Start the React server with `npm run dev`.
4. Navigate to `/server` and run `npm install`.
5. Start the Node server with `node app.js`.
## 🕸️ Snippets
Codegem allows you to share and discover code snippets. Whether it's a clever algorithm or a creative solution, showcase your coding prowess with the community.
## 🔗 Links
- [Codegem Website](https://codegem.netlify.app)
## 🚀 More
For more amazing projects and development tools, check out [DevX Studio](https://devx.studio). DevX Studio is dedicated to building innovative projects to empower developers worldwide.
| Social media applcation for developers for saving, sharing and posting codes | expressjs,fullstack-development,javascript,material-ui,mern,mernstack,mongodb,nodejs,reactjs,tailwindcss | 2023-08-31T03:07:45Z | 2024-05-18T12:48:03Z | null | 2 | 4 | 47 | 0 | 3 | 5 | null | null | TypeScript |
TheGuyDangerous/MernStack | main | # MERN Templates
## Description
This repository is a curated collection of templates for MERN (HTML, CSS, React.js, Bootstrap) stack development. It aims to provide a quick and organized starting point for building full-stack web applications.
## Table of Contents
- [Installation](#installation)
- [Features](#features)
- [Folder Structure](#folder-structure)
- [Contributing](#contributing)
- [License](#license)
## Installation
1. **Clone the Repository:**
```bash
git clone https://github.com/TheGuyDangerous/Mern-Templates.git
```
2. **Navigate to the Project Directory:**
```bash
cd Mern-Templates
```
3. **Run LiveServer Extension**
```bash
download the live server extension from VS code's extension library
```
## Features
- **MongoDB Integration:** Seamless integration with MongoDB for efficient data storage.
- **Express.js Backend:** A robust Express.js backend to handle API requests and business logic.
- **React.js Frontend:** A scalable React.js frontend for building modern user interfaces.
- **Node.js Server:** A Node.js server to serve your application and handle server-side logic.
- **Authentication Middleware:** Included authentication middleware for secure user authentication.
- **Webpack Configuration:** Optimized Webpack configuration for bundling and optimizing your code.
## Folder Structure
```
Mern-Templates/
|-- Bootstrap/
| |-- homepage-temp/
| | |-- css/
| | | |-- ...
| | |-- js/
| | | |-- ...
| | |-- |homepage.html
| |-- template2/
| | |-- ...
|-- CSS/
| |-- template1.html
| |-- template2.html
| |-- ...
|-- HTML/
| |-- template1.html
| |-- template2.html
| |-- ...
|-- Js/
| |-- template1.html
| |-- template2.js
| |-- ...
|-- React/
| |-- template1/
| | |-- build/
| | | |--index.html
| | |-- public/
| | | |-- ...
| | |-- |src
|-- ...
|-- README.md
|-- .hintrc
|-- index.html
|-- ...
```
## Contributing
We welcome contributions to improve and expand this repository. If you have a suggestion, found a bug, or want to add a new template, please open an issue or submit a pull request. Before contributing, please read our [contributing guidelines](CONTRIBUTING.md).
### Fork the Repository
Create a fork of the repo, by tapping on the fork button, inside the repo page.
###
Follow the [Installation](#installation) Section
### Template Selection
Choose a category that suits your project requirements. Each template is located in its respective directory under the `HTML` `CSS` `Javascript` `Bootstrap` and `React` folder.
### Configuration
Customize the configuration files according to your project needs. Update environment variables, database connections, and any other settings as required.
### Development
Start the live server extension and build upon the repository to create your own template.
### Production Build for react pages inside
When ready for production, submit a Pull request to the repository.
```bash
git push -u origin main
```
## License
This project is licensed under the [MIT License](LICENSE).
| Free Mern Templates | beginner-friendly,css,example-code,example-project,examples,html,html-css-javascript,javascript,mern,mern-boilerplate | 2023-09-04T07:27:05Z | 2024-01-25T14:10:59Z | 2023-12-17T09:03:11Z | 1 | 8 | 17 | 2 | 2 | 5 | null | MIT | JavaScript |
Choaib-ELMADI/whatsapp-clone | main | This is a [Next.js](https://nextjs.org/) project bootstrapped with [`create-next-app`](https://github.com/vercel/next.js/tree/canary/packages/create-next-app).
## Getting Started
First, run the development server:
```bash
npm run dev
# or
yarn dev
# or
pnpm dev
```
Open [http://localhost:3000](http://localhost:3000) with your browser to see the result.
You can start editing the page by modifying `app/page.tsx`. The page auto-updates as you edit the file.
This project uses [`next/font`](https://nextjs.org/docs/basic-features/font-optimization) to automatically optimize and load Inter, a custom Google Font.
## Learn More
To learn more about Next.js, take a look at the following resources:
- [Next.js Documentation](https://nextjs.org/docs) - learn about Next.js features and API.
- [Learn Next.js](https://nextjs.org/learn) - an interactive Next.js tutorial.
You can check out [the Next.js GitHub repository](https://github.com/vercel/next.js/) - your feedback and contributions are welcome!
## Deploy on Vercel
The easiest way to deploy your Next.js app is to use the [Vercel Platform](https://vercel.com/new?utm_medium=default-template&filter=next.js&utm_source=create-next-app&utm_campaign=create-next-app-readme) from the creators of Next.js.
Check out our [Next.js deployment documentation](https://nextjs.org/docs/deployment) for more details.
| Still working here 😃 | clone-app,javascript,nextjs,socket-io,webpush,whatsapp | 2023-09-07T12:09:16Z | 2023-09-07T12:08:09Z | null | 1 | 0 | 23 | 0 | 0 | 5 | null | null | TypeScript |
up-csi/up-csi.github.io | main | # UP CSI Website
The University of the Philippines Center for Student Innovations (UP CSI) website is a statically generated website built with the [SvelteKit] framework, which uses [Vite] as its build system under the hood. Components are then styled using [TailwindCSS].
[SvelteKit]: https://kit.svelte.dev/
[Vite]: https://vitejs.dev/
[TailwindCSS]: https://tailwindcss.com/
# Development
We use [`pnpm`] as the package manager for [Node.js]. See the installation guide [here](https://pnpm.io/installation).
[`pnpm`]: https://pnpm.io/
[Node.js]: https://nodejs.org/
```bash
# Install the project dependencies.
pnpm install
# One-time setup of the auto-generated `.svelte-kit` folder.
pnpm sync
# Same as the file watcher, but also starts a developer server at
# `localhost:5173` by default. Live-reloading and hot module replacement
# has been disabled by default.
pnpm dev
# Build and optimize the project. Static assets are saved to `build/`.
pnpm build
# Locally preview the production website after building.
pnpm preview
```
To maintain a high standard in the codebase, we use [GitHub Actions] to automatically run formatters (i.e., [Prettier]), linters (i.e., [LintHTML], [Stylelint], [ESLint], and [Svelte Check]), and builders (i.e., [Vite]) for each push to the repository (including pull requests). We strive to keep `main` at a green state (i.e., all tests pass) at all times. **No exceptions.**
[GitHub Actions]: https://github.com/features/actions
[Prettier]: https://prettier.io/
[LintHTML]: https://linthtml.vercel.app/
[Stylelint]: https://stylelint.io/
[ESLint]: https://eslint.org/
[Svelte Check]: https://www.npmjs.com/package/svelte-check
Before pushing to the repository, one may be inclined to locally run the formatters, linters, and builders themselves.
```bash
# Check the code formatting with Prettier.
pnpm fmt
# Apply Prettier's suggestions.
pnpm fmt:fix
# Run all linters: HTMLHint, Stylelint, ESLint, and Svelte Check.
pnpm lint
```
# Frequently Asked Questions
## How does one write new content?
Simply edit the HTML and Svelte components. Add Tailwind styles as deemed necessary. Pull requests are _highly_ encouraged.
## Why not use a content management system like WordPress?
Statically generating the website allows the build system to _aggressively_ prune unused code, optimize resources, and minify assets. Given that the end result is a single immutable `build/` folder that contains everything (e.g., HTML, CSS, JS, images, fonts, etc.), the website is thus _incredibly trivial_ to deploy and cache. Such a setup is practically the pinnacle of web performance. Many services will even host the static content for free! No need for a fancy server-side-rendered [Django] application nor a bloated [WordPress] instance powered by an [Apache] server running [PHP] code with [MySQL] as the backing content store.
[Django]: https://www.djangoproject.com/
[Wordpress]: https://wordpress.org/
[Apache]: https://apache.org/
[PHP]: https://www.php.net/
[MySQL]: https://www.mysql.com/
## Why do we use `pnpm` and not the default `npm`?
Unlike `npm`, `pnpm` is fast and space-efficient. Instead of downloading an entire tree of `node_modules` for _each_ project, `pnpm` globally stores all packages so that future installations simply symlink to the common folder. This alone empowers `pnpm` to [outperform](https://pnpm.io/benchmarks) all other package managers in the market. See more details in the [documentation](https://pnpm.io/motivation).
# Credits
- This repository was originally bootstrapped by [Basti Ortiz](https://bastidood.github.io/) during the Academic Year 2023-2024 when he served as the UP CSI Director for Engineering.
- Repository Setup
- Automation with GitHub Actions
- Original Build System with Parcel
- New Build System with Vite
| The source code for the official UP CSI website. | css,html,javascript,typescript,tailwind,svelte,sveltekit,vite,hacktoberfest | 2023-08-13T18:40:40Z | 2024-05-14T20:39:47Z | null | 10 | 37 | 407 | 10 | 13 | 5 | null | NOASSERTION | Svelte |
AlgoManiacZ/AlgoManiacZ_Revamped | main | # AlgoManiacZ_Revamped
**New website for AlgoManiacZ**
The Design should look like below
## Introduction
AlgoManiacZ is a vibrant community of passionate coders and
problem solvers dedicated to helping each other excel in the art
of problem solving and DSA. The project utilizes npm (Node Package Manager) and version control using Git to manage the codebase and facilitate collaboration.
---
<div align="center">
<h2 align=center>Project Maintainers</h2>
<table align="center">
<tr>
<td align="center">
<a href="https://github.com/Akshatchaube01">
<img src="https://avatars.githubusercontent.com/u/92796050?v=4" width="100px" alt=""/>
<br />
<sub><b>Akshat Chaube</b></sub>
</a>
</td>
<td align="center">
<a href="https://github.com/karthiknadar1204">
<img src="https://avatars.githubusercontent.com/u/95973644?v=4" width="100px" alt=""/>
<br />
<sub><b>
karthik nadar</b></sub>
</a>
</td>
</tr>
</table>
</div>
---
## Getting Started
To contribute to the project, follow the steps below:
1. **Fork the Repository**
- Go to the GitHub repository at [https://github.com/AlgoManiacZ/AlgoManiacZ_Revamped.git](https://github.com/AlgoManiacZ/AlgoManiacZ_Revamped.git)
- Click on the "Fork" button in the top-right corner of the page.
- This will create a copy of the repository in your GitHub account.
1. **Clone the Repository**
- On your local machine, open a terminal or command prompt.
- Use the following command to clone the repository:
```bash
git clone https://github.com/AlgoManiacZ/AlgoManiacZ_Revamped.git
```
- This will create a local copy of the repository on your machine.
1. **Install Dependencies**
- Navigate to the project's root directory:
```bash
cd AlgoManiacZ_Revamped/
cd algoManiacZ/
```
- Run the following command to install the project dependencies using npm:
```bash
npm install
```
1. **Run the Project**
- To run the project locally
```bash
npm run dev
```
1. **Maintaining Synchronization**
- Go to your forked resository and click `Sync fork` to stay updated with the actual repository.
- Always take a pull from the repository to your master branch to keep it updated with the updated repository
```bash
git pull
```
1. **Creating a New Branch**
- Before starting work on a new feature or bug fix, create a new branch with your GitHub profile name:
```bash
git checkout -b your-github-profile-name
```
1. **Start Contributing**
- Now that you have set up the project on your local machine, you can start contributing to the project by adding the necessary functionality to connect blood donors with individuals in need.
1. **Committing Changes**
- After making changes to the code, use the following command to stage the changes:
```bash
git add .
```
- Commit the changes with a descriptive message:
```bash
git commit -m "Add feature XYZ"
```
1. **Pushing Changes**
- Push your changes to your forked repository:
```bash
git push -u origin your-github-profile-name
```
1. To create a pull request, go to your fork of this repository,, you will see **`compare and pull requests`**. Click on that big green button
1. Add an appropriate title and description to your pull request explaining your changes and efforts done.
1. Click on **`Create Pull Request`**.
1. Voila! You have made a PR to the **AlgoManiacZ** 💥 Wait for your submission to be accepted and your PR to be merged 🎉
| New website for AlgoManiacZ (ongoing project) | hacktoberfest,javascript,reactjs,hacktoberfest-2023,hacktoberfest2023,hacktoberfest-accepted | 2023-08-14T13:49:06Z | 2023-10-24T12:21:37Z | null | 39 | 39 | 95 | 2 | 31 | 5 | null | MIT | JavaScript |
sameerkali/Todo_Ace | main | # Todo_Ace
Todo Ace is a simply advanced todo list application built with React 18 and TypeScript.
# Todo Ace [live](https://react-todo-youtube-h8vc.vercel.app/)
Todo Ace is a simple todo list application built with React 18 and TypeScript.
## Features
- Add, edit, and delete tasks
- Mark tasks as completed
- Filter tasks by status
- Responsive and user-friendly interface
## Technologies Used
- [React 18](https://reactjs.org/)
- [TypeScript](https://www.typescriptlang.org/)
- [Vite](https://vite.com/)
## Installation
1. Clone the repository:
```bash
git clone https://github.com/your-username/todo-ace.git
```
```bash
cd todo-ace
```
```bash
npm install
```
```bash
npm run dev
```
# Usage
Add a new task by typing into the input field and pressing Enter.
Edit a task by clicking on it and modifying the text.
Mark a task as completed by clicking the checkbox next to it.
Delete a task by clicking the delete button next to it.
Use the filter options to view tasks based on their completion status.
## Contributing
Contributions are welcome! If you'd like to contribute:
1. Fork the repository
2. Create a new branch: `git checkout -b feature-name`
3. Make your changes and commit them: `git commit -m 'Add new feature'`
4. Push to the branch: `git push origin feature-name`
5. Create a pull request
## License
This project is licensed under the MIT License - see the LICENSE file for details.
---
make with ~~lust~~ love 💖 by @sameerkali
| Introducing Todo Ace: 🚀 A stylish, advanced todo app crafted with React 18 and TypeScript. Organize tasks effortlessly with three tabs—📝 pending, ✅ completed, and 🗂️ all tasks. Enjoy a convenient delete feature and an impressive UI for seamless task management. | happycoding,hardwork,hooks,javascript,javascript-library,json,latest,open-source,react,react18 | 2023-08-10T16:34:52Z | 2023-08-12T17:34:43Z | null | 1 | 0 | 9 | 0 | 0 | 5 | null | null | TypeScript |
p32929/google-calender-widget | master | ## google-calender-widget
An unofficial google calendar desktop widget for Windows, Mac and Linux
## Features
### Agenda View + Dark mode
### Tray menu
## Share with your friends and family
[](https://www.facebook.com/sharer/sharer.php?u=https://github.com/p32929/google-calender-widget)
[](https://twitter.com/intent/tweet?url=https://github.com/p32929/google-calender-widget)
[](https://api.whatsapp.com/send?text=https://github.com/p32929/google-calender-widget)
[](https://www.linkedin.com/shareArticle?mini=true&url=https://github.com/p32929/google-calender-widget)
[](https://pinterest.com/pin/create/button/?url=https://github.com/p32929/google-calender-widget)
[](https://www.reddit.com/submit?url=https://github.com/p32929/google-calender-widget)
[](https://getpocket.com/save?url=https://github.com/p32929/google-calender-widget)
[](https://www.tumblr.com/share?v=3&u=https://github.com/p32929/google-calender-widget)
## How to install
Download from release ( https://github.com/p32929/google-calender-widget/releases/latest ) and simply install and run
## How to use
1. Open the app
2. Login using google
3. Done!
## Todos
* Automatic deployment via Github actions
* Convert to TypeScript
* Let me think...
## How to contribute?
* First discuss the issue by creating a new issue.
* Don't make pull requests by changing the readme file without discussing.
## License
```
MIT License
Copyright (c) 2023 Fayaz Bin Salam
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
```
| An unofficial google calendar desktop widget for Windows, Mac and Linux | calendar,calendar-events,calendar-view,calendar-widget,cross-platform,day-view,desktop,electron,google-calendar,javascript | 2023-08-10T15:29:19Z | 2024-01-07T22:33:09Z | 2024-01-07T22:33:09Z | 1 | 0 | 35 | 2 | 0 | 5 | null | MIT | CSS |
AN1001/IVCalc | main | <img width="100%" alt="Screenshot 2023-08-21 at 17 56 58" src="https://github.com/AN1001/IVCalc/assets/81749717/9fca4a9e-294d-4340-8165-4026f22b0fff">
Wrapper and Investment platform comparer, Investment insight and analysis, Ranks Platforms and gives lowest cost platform. Website : https://ivcalc.pages.dev
IV Calc is a powerful investment platform calculator
Investment can be tricky at time due to high levels of uncertainty alongside other complex factors. One such factor may be choosing the right platform to hold your investments on, as their charges vary greatly and are often confusing. It's impossible to know with certainty how to get the most out of your money, but using tools like IV Calc it is possible to reach an informed decision.
With IV Calc you can not only compare different investment platforms, but also simulate their use in real time. This is effective against 27 different platforms for both funds and shares.
This website includes line graphs using the library chart.js and is built without any other dependencies or frameworks.
IV Calc also supports 4 wrappers (ISA, JISA, GIA/Direct, SIPP), as well as both shares/stocks and funds as seperate componenents
<img width="100%" alt="Screenshot 2023-08-21 at 17 54 45" src="https://github.com/AN1001/IVCalc/assets/81749717/47eaa2d4-f8fe-495c-8868-f4be5c663c08">
<h3>Created by Arnav Nagpure (AN1001)</h3>
| Wrapper and Investment platform comparer, Investment insight and analysis, Ranks Platforms and gives lowest cost platform | investment,investment-analysis,investment-portfolio,javascript,webdev,website | 2023-08-10T18:41:52Z | 2024-04-28T19:09:44Z | 2023-08-21T11:49:56Z | 1 | 0 | 92 | 2 | 0 | 5 | null | NOASSERTION | HTML |
Kaiserabbas/Tool-Shed | master |
# Welcome to the Toolshed!
We're glad you're here. We've put together a collection of useful tools that we hope you'll find helpful.
Here are a few of our most popular tools:
Find your IP address: This tool will tell you your IP address, which is a unique identifier for your computer on the internet.
Display a random API quote: This tool will display a random quote from an API, which is a set of programming instructions that allow you to access data or functionality from another website or application.
Generate a random password: This tool will generate a random password that is strong and secure.
Convert between different units of measurement:This tool will convert between different units of measurement, such as meters and feet, or pounds and kilograms.
Dictionary: Our dictionary tool allows you to look up the definition of any word in the English language. Simply enter the word you want to look up and our tool will return the definition, as well as other related information such as synonyms, antonyms, and examples of how the word is used in a sentence. Our dictionary tool is powered by a large database of words and definitions, so you can be sure to find the information you're looking for. We also update our database regularly to ensure that you have access to the latest definitions.
We're always adding new tools, so be sure to check back often. And if you have any suggestions for new tools, please let us know.
Thanks for visiting the Toolshed!
This project was bootstrapped with [Create React App](https://github.com/facebook/create-react-app).
## Available Scripts
In the project directory, you can run:
### `npm start`
Runs the app in the development mode.\
Open [http://localhost:3000](http://localhost:3000) to view it in your browser.
The page will reload when you make changes.\
You may also see any lint errors in the console.
### `npm test`
Launches the test runner in the interactive watch mode.\
See the section about [running tests](https://facebook.github.io/create-react-app/docs/running-tests) for more information.
### `npm run build`
Builds the app for production to the `build` folder.\
It correctly bundles React in production mode and optimizes the build for the best performance.
The build is minified and the filenames include the hashes.\
Your app is ready to be deployed!
See the section about [deployment](https://facebook.github.io/create-react-app/docs/deployment) for more information.
### `npm run eject`
**Note: this is a one-way operation. Once you `eject`, you can't go back!**
If you aren't satisfied with the build tool and configuration choices, you can `eject` at any time. This command will remove the single build dependency from your project.
Instead, it will copy all the configuration files and the transitive dependencies (webpack, Babel, ESLint, etc) right into your project so you have full control over them. All of the commands except `eject` will still work, but they will point to the copied scripts so you can tweak them. At this point you're on your own.
You don't have to ever use `eject`. The curated feature set is suitable for small and middle deployments, and you shouldn't feel obligated to use this feature. However we understand that this tool wouldn't be useful if you couldn't customize it when you are ready for it.
## Learn More
You can learn more in the [Create React App documentation](https://facebook.github.io/create-react-app/docs/getting-started).
To learn React, check out the [React documentation](https://reactjs.org/).
### Code Splitting
This section has moved here: [https://facebook.github.io/create-react-app/docs/code-splitting](https://facebook.github.io/create-react-app/docs/code-splitting)
### Analyzing the Bundle Size
This section has moved here: [https://facebook.github.io/create-react-app/docs/analyzing-the-bundle-size](https://facebook.github.io/create-react-app/docs/analyzing-the-bundle-size)
### Making a Progressive Web App
This section has moved here: [https://facebook.github.io/create-react-app/docs/making-a-progressive-web-app](https://facebook.github.io/create-react-app/docs/making-a-progressive-web-app)
### Advanced Configuration
This section has moved here: [https://facebook.github.io/create-react-app/docs/advanced-configuration](https://facebook.github.io/create-react-app/docs/advanced-configuration)
### Deployment
This section has moved here: [https://facebook.github.io/create-react-app/docs/deployment](https://facebook.github.io/create-react-app/docs/deployment)
### `npm run build` fails to minify
This section has moved here: [https://facebook.github.io/create-react-app/docs/troubleshooting#npm-run-build-fails-to-minify](https://facebook.github.io/create-react-app/docs/troubleshooting#npm-run-build-fails-to-minify)
| We're glad you're here. We've put together a collection of useful tools that we hope you'll find helpful. Here are a few of our most popular tools: Find your IP, random quote, Generate password, weather updates, dictionary and more... | api-client,api-rest,component,javascript,react,toolset | 2023-08-15T08:03:37Z | 2023-08-20T07:43:05Z | null | 3 | 2 | 28 | 0 | 0 | 5 | null | null | JavaScript |
CodeSystem2022/CuartoSemestre-EncryptedCode | main | # CuartoSemestre-EncryptedCode
# Metodologia de Sistemas
Java Avanzado 
Node 
# Laboratorio IV
Python-Javascript-Diseño para Developers
# Scrum master 2023 :
# Andrea Llavel 🌟🌟🌟
# | Semana1 👉| 17/08/-21/08/ |*| Completa |
# | Semana4 | Cubriendo a Lucas Limachi | 05/09-11/09 | Completo |
# | Semana5 👉| 12/09/-18/09/ |*| Completa |
# |Semana10 👉| 17/10/-27/10/ |*| Completa |
# Rocio Pulitta 🌟🌟🌟
# | Semana2 👉| 22/08/-28/08/ |*| Completa |
# | Semana7 👉| 26/09-02/10/ |*| Completa |
# | Semana11👉| 28/10/-06/11/ |*| En Proceso |
# Roberto Perez 🌟🌟🌟
# | Semana3👉 | 29/08/-04/09/ |*| Completa |
# | Semana8👉 | 03/10/-09/10/ |*| Completa |
# | Semana13👉| 07/11/-14/11 | |
# Lucas Limachi 🌟🌟🌟
# | Semana4 👉| 05/09/-11/09/ | Incompleta |Cubierta por otro Scrum |
# | Semana6 👉| 19/09/25/09/ |*| Completa |
# | Semana9 👉| 10/10/-16/10/ |*| Completa |
# | Semana1 👉| 15/11/-22/11/ | |
| Equipo de trabajo en Laboratorio IV y Metodología de Sistemas, Estudiantes UTN | java,javascript,python,nodejs | 2023-08-17T13:02:08Z | 2023-11-12T19:24:29Z | 2023-11-03T15:20:34Z | 7 | 12 | 166 | 0 | 1 | 5 | null | null | Java |
Alexandrbig1/goit-js-hw-10 | main | # goit-js-hw-10
doing homework while studying in bootcamp @GoIT on Fullstack developer course
## Project Specifications
Java Script module(homework10 JSON/API/WEB API/REST API/AJAX/DOM/events/patterns/optimization/libraries/localStorage/API/flatpickr-library/notiflix-library/Date/SetTime/Timer/promises)
| homework(JavaScript module) in bootcamp (GoIT) Fullstack developer | frontend,html-css-javascript,javascript,js,json,json-api,json-server,webdesign,webdevelopment | 2023-08-24T20:29:36Z | 2023-08-25T13:25:08Z | null | 3 | 0 | 85 | 0 | 0 | 5 | null | null | JavaScript |
dmitrichev/pickly-page-blend | master | # Pickly PageBlend
Pickly PageBlend - the easiest way to share your Obsidian notes.
## Features
- Note publication
- Markdown syntax support
- Publication of linked notes and files
- Permanent link to files
- Beautiful social media previews
- Create a video from the text of your note and publish it directly on the page (works through [Viqeo.tv Article-to-video player](https://viqeo.tv/article-to-video-player), there is a free plan)
## Usage
You can publish your notes in several ways:
- Just press `Command+Shift+P` (`Ctrl+Shift+P` if you are using Windows/Linux)
- Through the file context menu. Open the file context menu and click "Publish with PageBlend."
- Through a command. To do this, execute the command "Pickly PageBlend: Publish with PageBlend."
Wait for the note to be published, after which you will receive a link to the published file.
## Preview
The preview image of your note will be set to the first image from the note.
If there are no images in your article, an image containing the title of your article will be automatically created. For example:
## Meta tags
By default, the note title will be used as the meta tags for your page.
You can change the meta tags by specifying the properties of your note.
```
---
pickly_title: Your custom title for <meta property="og:title"> and other.
pickly_description: Your custom description for <meta name="description"> and other.
---
```
The title of the page will always match the title of your note.
## Note to video
> **Video is created automatically within 10-15 minutes. After publishing, open your page in a browser, opening the page will start the video creation process.**
Create a video from your note with [Viqeo and Article-To-Video Player](https://viqeo.tv/article-to-video-player).
Example: [https://pb.pickly.space/pages/article-to-video-example.html](https://pb.pickly.space/pages/article-to-video-example.html)
You need:
1. create an account on [Viqeo.tv](https://studio.viqeo.tv)
2. Add article-to-video player
3. Customize it
> **Important! Set the "CSS-Selector of the element" field to** `.container .cover`
4. Get the player's embed code
5. Add options to your note properties
```
pickly_ttv: yes
viqeo_player_id: 123
viqeo_profile_id: 321
```
The `pickly_ttv` field says that you want to generate a video from your note. It should always equal `yes`.
In the `viqeo_player_id` field, enter your player id from the embed code, `data-playerId` field.
In the `viqeo_profile_id` field, enter the profile ID from the embed code, `data-profileId` field.
Publish your note and wait for the video to be created!
## Installing
The plugin is still under approval. Only manual installation available.
## Manual installation
1. Download the latest release
2. Extract the `pickly-page-blend` folder from the zip to your vault's plugins folder: <vault>/.obsidian/plugins/
> Note: On some machines the `.obsidian` folder may be hidden. On MacOS you should be able to press `Command+Shift+Dot` to show the folder in Finder.
3. Reload Obsidian
4. If prompted about Safe Mode, you can disable safe mode and enable the plugin.
## License
MIT License
## Support
I developed this project in my free time. I use this plugin in my everyday life and am very satisfied with it. It has been an engaging journey for me, and I hope my work will also benefit you. The project is entirely free and will remain so. However, if you decide to show your appreciation for this work, I would be very grateful to you.
<a href='https://ko-fi.com/B0B7OB311' target='_blank'><img height='36' style='border:0px;height:36px;' src='https://storage.ko-fi.com/cdn/kofi1.png?v=3' border='0' alt='Buy Me a Coffee at ko-fi.com' /></a>
| The easiest way to share your Obsidian notes | javascript,obsidian,obsidian-md,obsidian-plugin,publishing,typescript | 2023-08-16T19:30:18Z | 2023-08-27T23:33:34Z | 2023-08-27T23:33:39Z | 1 | 0 | 16 | 1 | 0 | 5 | null | MIT | TypeScript |
OrangeDev2/GPT-conversations-scraper | main | 
# Shared Conversation Web Scraper API - Available in Python and JavaScript
**Shared Conversation Scraper API: Extracting Dialogues from ChatGPT, Bing, and Poe and Converting Them to JSON Format. Available in Python and JavaScript.**
# ChatGPT 3.5 Dialogues in JSON Format. GPT-4 will also be compatible.
# Poe (Google-PaLM) Dialogues in JSON Format.
# Bing AI Chat - Dialogues in JSON Format.
# **Clone the Repository**: Clone or download this repository.
# JavaScript Version
1. Install NodeJS: https://nodejs.org/en Make sure you have (LTS) installed
2. `cd javascript_version`- navigate to correct directory
3. `npm install` - to install the required dependencies: (node_modules folder and package-lock.json)
4. Make sure to replace `https://chat.openai.com/share/[id]` in `scrape.js - line 19` with any share link you want to scrape.
5. `npm start` - Your server will be hosted at http://localhost:3000/
6. `Ctrl+C` + `y` + `Enter` to shut down server.
7. Repeat Step 4
# Python Version
1. Install Python: Make sure you have Python installed. You can download it from python.org.
2. `cd python_version`- navigate to correct directory
3. `pip install Flask requests beautifulsoup4` - to install the required dependencies
4. Make sure to replace `https://poe.com/s/[id]` in `scrape.py - line 19` with any share link you want to scrape.
5. `python scrape.py` - Your server will be hosted at http://localhost:5000/
6. `Ctrl+C` to shut down server
7. Repeat Step 4
| Extracting Dialogues from ChatGPT, Bing, and Poe shared link conversations and Converting Them to JSON Format. | bing-chat,chatgpt,dialogues,javascript,json,poe,python,scraper,scraper-api,web-server | 2023-08-16T18:34:57Z | 2023-08-17T17:29:03Z | null | 1 | 0 | 31 | 0 | 0 | 5 | null | MIT | JavaScript |
MoSalem149/ITI-ST-Final-Project-eStore | main | # Getting Started with Create React App
This project was bootstrapped with [Create React App](https://github.com/facebook/create-react-app).
## Available Scripts
In the project directory, you can run:
### `npm start`
Runs the app in the development mode.\
Open [http://localhost:3000](http://localhost:3000) to view it in your browser.
The page will reload when you make changes.\
You may also see any lint errors in the console.
### `npm test`
Launches the test runner in the interactive watch mode.\
See the section about [running tests](https://facebook.github.io/create-react-app/docs/running-tests) for more information.
### `npm run build`
Builds the app for production to the `build` folder.\
It correctly bundles React in production mode and optimizes the build for the best performance.
The build is minified and the filenames include the hashes.\
Your app is ready to be deployed!
See the section about [deployment](https://facebook.github.io/create-react-app/docs/deployment) for more information.
### `npm run eject`
**Note: this is a one-way operation. Once you `eject`, you can't go back!**
If you aren't satisfied with the build tool and configuration choices, you can `eject` at any time. This command will remove the single build dependency from your project.
Instead, it will copy all the configuration files and the transitive dependencies (webpack, Babel, ESLint, etc) right into your project so you have full control over them. All of the commands except `eject` will still work, but they will point to the copied scripts so you can tweak them. At this point you're on your own.
You don't have to ever use `eject`. The curated feature set is suitable for small and middle deployments, and you shouldn't feel obligated to use this feature. However we understand that this tool wouldn't be useful if you couldn't customize it when you are ready for it.
## Learn More
You can learn more in the [Create React App documentation](https://facebook.github.io/create-react-app/docs/getting-started).
To learn React, check out the [React documentation](https://reactjs.org/).
### Code Splitting
This section has moved here: [https://facebook.github.io/create-react-app/docs/code-splitting](https://facebook.github.io/create-react-app/docs/code-splitting)
### Analyzing the Bundle Size
This section has moved here: [https://facebook.github.io/create-react-app/docs/analyzing-the-bundle-size](https://facebook.github.io/create-react-app/docs/analyzing-the-bundle-size)
### Making a Progressive Web App
This section has moved here: [https://facebook.github.io/create-react-app/docs/making-a-progressive-web-app](https://facebook.github.io/create-react-app/docs/making-a-progressive-web-app)
### Advanced Configuration
This section has moved here: [https://facebook.github.io/create-react-app/docs/advanced-configuration](https://facebook.github.io/create-react-app/docs/advanced-configuration)
### Deployment
This section has moved here: [https://facebook.github.io/create-react-app/docs/deployment](https://facebook.github.io/create-react-app/docs/deployment)
### `npm run build` fails to minify
This section has moved here: [https://facebook.github.io/create-react-app/docs/troubleshooting#npm-run-build-fails-to-minify](https://facebook.github.io/create-react-app/docs/troubleshooting#npm-run-build-fails-to-minify)
| The E-Store website is an e-commerce platform developed by a talented team. It's designed to provide a user-friendly and convenient shopping experience. | bootstrap5,css3,ecmascript6,html5,javascript,jquery,json,jsx,react-bootstrap,react-components | 2023-09-10T22:38:31Z | 2023-09-11T17:30:43Z | null | 1 | 0 | 10 | 0 | 0 | 5 | null | null | JavaScript |
Seromitschu/image-hosting | main | <h1>Seromitschu Image Hosting</h1>
> - This website made by **Seromitschu**. <br>
> - Click to see the current trial site. <a target="_blank" href="https://img.seromitschu.repl.co">Live Demo<a>
<h1>Build With</h1>
**This project was built using these technologies.**
<br><br>
> - JavaScript
> - HTML
> - CSS <br> **Languages were used while making this website.**
> - Replit <br>**Deploying service.**
> - Visual Studio Code <br>**Code Editor**
> - Font Awesome <br> **Icons**
<h1>Getting Started</h1>
> - Download project and open in your code editor.
> - Open terminal and install modules with ``npm install``.
> - Type ``npm start`` and go ``localhost:8080``.
**Now you can customize and use the website according to you!**
> - If you want, you can activate your website using replit.
<h2>Don't forget to give a ⭐ if you like the project!</h2>
| 🌌 A simple image hosting website. | image-host,image-hosting,image-to-link,html,javascript | 2023-08-29T09:00:27Z | 2023-08-29T09:14:53Z | null | 1 | 0 | 4 | 0 | 4 | 5 | null | MIT | HTML |
huzgrx/react-dashboard | main | <!-- PROJECT LOGO -->
<div align="center">
<a href="https://github.com/huzgrx/react-dashboard">
<img src="./src/assets/logo.png" alt="Logo" width="80" height="80">
</a>
<h3 align="center">Triolo</h3>
<p align="center">
A static Reactjs admin dashboard mockup/clone
<br />
<a href="https://github.com/huzgrx/react-dashboard/issues">Report Bug</a>
</div>
## About The Project
<img src="https://i.ibb.co/dBKzVtZ/screenshot.png" />
This is a static admin dashboard mockup/clone from <a href="https://demos.themeselection.com/materio-mui-react-nextjs-admin-template">Materio Theme</a>. This has been built for learning purpose specifically focus in Reactjs. Feel free to use this project if you might find it usefull to you.
### <a href="https://triolo.vercel.app">Demo 🚀</a>
### Built With
- 
- 
- 
- 
- 
- 
- 
- 
- 
- 
- 
### Installation
1. Clone the repo
```sh
git clone https://github.com/Ashik-AD/react-dashboard.git
```
2. Install NPM packages
```sh
npm install
```
3. Start local dev
```sh
npm run dev
```
## In the future
- [ ] Add real authentication
- [ ] Add Skeleton loading indicators
## Acknowledgments
I find these resources usefull during building this project.
- [Materio Theme for the project inspiration](https://demos.themeselection.com/materio-mui-react-nextjs-admin-template/demo-1/dashboards/crm/)
- [Reactjs Doc](https://beta.reactjs.org/)
- [Reactjs Patterns](https://react-typescript-cheatsheet.netlify.app/)
- [Material-UI for component inspiration](https://mui.com/material-ui/)
- [Imgdb.com for hosting project images](https://imgbb.com/)
- [How to write Github Readme.md from Auth. @othneildrew](https://github.com/othneildrew/Best-README-Template)
| A static react admin dashboard (Materio theme mockup) | charts,css,html,javascript,json,reactjs,scss,typescript | 2023-08-09T01:25:13Z | 2023-08-09T01:32:05Z | null | 1 | 0 | 362 | 0 | 1 | 5 | null | null | TypeScript |
jacobmarks/fiftyone-youtube-panel-plugin | main | ## YouTube Panel Player Plugin
This plugin allows you to play YouTube videos in a panel the FiftyOne App!
## Usage
The plugin comes with several FiftyOne and FiftyOne Plugins YouTube videos that
the user can play. You can also play other YouTube videos by entering the URL!
## Watch On Youtube
[](https://www.youtube.com/watch?v=4rLigzm3RMA&list=PLuREAXoPgT0RZrUaT0UpX_HzwKkoB-S9j&index=4)
## Installation
```shell
fiftyone plugins download https://github.com/jacobmarks/fiftyone-youtube-panel-plugin
```
Refer to the [main README](https://github.com/voxel51/fiftyone-plugins) for
more information about managing downloaded plugins and developing plugins
locally.
## Operators
### `open_youtube_player_panel`
- Opens the YouTube player panel on click
There are three ways to execute this operator:
1. Press the YouTube player button in the Sample Actions Menu:
2. Click on the `+` icon next to the `Samples` tab and select `YouTube Player` from the dropdown menu:
3. Press "\`" to pull up your list of operators, and select `open_youtube_player_panel`:
| FiftyOne Plugin to open a YouTube video player in a new panel! | fiftyone,javascript,material-ui,plugin,python,react,youtube | 2023-09-05T01:03:51Z | 2023-11-01T19:49:22Z | null | 1 | 0 | 9 | 0 | 0 | 5 | null | null | TypeScript |
FurryR/clash-rules | main | # clash-rules
为任意代理添加自定义规则集，并轻松实现分规则代理的节点选择。
- [clash-rules](#clash-rules)
- [功能](#功能)
- [支持](#支持)
- [安装](#安装)
- [配置](#配置)
- [推荐](#推荐)
- [赞助](#赞助)
## 功能
- [x] 为自己 3 分钟制作的 proxy 快速添加规则列表
- [x] 轻松实现分规则代理
## 支持
- [x] 在 Clash For Windows 上可直接使用此插件。
- [x] 通过使用 [clash-mixin](https://github.com/FurryR/clash-mixin)，在任何 clash 客户端上都能使用预先生成好的配置。
更多信息请查看[安装](#安装)。
## 安装
请参见 [doc/INSTALL.md](doc/INSTALL.md)。
## 配置
请参见 [doc/CONFIG.md](doc/CONFIG.md)。
## 推荐
[nullqwertyuiop-rules](https://github.com/FurryR/nullqwertyuiop-rules)，开箱即用的 clash-rules 规则。适用于大部分场合。
## 赞助
如果真的很喜欢这个项目，第一推荐是为这个项目做些力所能及的贡献。
如果并不会写 Javascript，也可以尝试通过 [爱发电](https://afdian.net/a/FurryR/plan) 赞助我。
这是我第一次摆上赞助链接。并不期望能通过这些赚日常喝咖啡的钱，只希望软件能够帮助到他人。
| 为任意代理添加自定义规则集，并轻松实现分规则代理的节点选择。 | clash,clash-for-windows,clash-rules,javascript | 2023-09-08T04:40:02Z | 2023-09-10T05:04:06Z | null | 1 | 0 | 21 | 0 | 0 | 5 | null | null | JavaScript |
lvcas-dotcom/portfolio-lucas | main | # 👋 Olá, clique no ícone do GitHub abaixo para ser redirecionado para o website do meu portfólio!
⬇️
[](https://lvcas-dotcom.github.io/portfolio-lucas/)
| Meu portfólio | front-end-web-development,html-css-javascript,javascript,web-developer-portfolio | 2023-08-10T16:31:37Z | 2024-04-10T23:38:38Z | null | 1 | 0 | 13 | 0 | 0 | 5 | null | null | CSS |
Luna-devv/lunify.js | master | [](https://lunish.nl/support)
[](https://ko-fi.com/I3I6AFVAP)
**⚠️ In development, breaking changes ⚠️**
## About
This is an unofficial [spotify](https://developer.spotify.com) package written for **Typecript and JavaScript** to interact with its public and oAuth API. Everything is tested with Visual Studio Code, node.js 21 or greater and Typescript (ESM, compiled to ES2016 - ES2022, CommonJS).
If you need help using this package, join **[our Discord Server](https://discord.com/invite/yYd6YKHQZH)**.
## Install
Download this [npm package](https://www.npmjs.com/package/lunify.js) to use in your project with the following commands:
If you run **node.js v18 or higher**, use
```bash
# With npm
npm install lunify.js
# With yarn
yarn add lunify.js
# With pnpm
pnpm add lunify.js
```
**node.js v17 or lower** is currently not supported.
## Quick documentation
All examples are written for **TypeScript**, if you use **JavaScript** please use the commonJS import method. Please note that every update could contain breaking changes during 0.x.x phase.
### Initiate lunify.js
This is essential for everything you want to do with this package, get your client id and client secrent from [the spotify developers dashboard](https://developer.spotify.com/dashboard), don't forget to keep the secret a secret :)
```ts
import { Lunify } from 'lunify.js';
const api = new Lunify({
clientId: '898e127e95f24f578fdbfec93ae203cd',
clientSecret: 'dc302ea39cefbdf875f42f59e721e898',
// If you want to have access to oauth2
oauth: {
redirectUri: 'http://10.0.0.50:7654/callback'
}
});
// If you want access to not oauth2 related routes like tracks,
// you need to fetch client credentials like bellow, we
// recommend having that in the root of your project.
await api.fetchCredentials();
```
### Oauth (login with spotify)
You can generate a url for users to login like shown bellow, [learn more about for what you need scopes here](https://developer.spotify.com/documentation/web-api/concepts/scopes), if you are unsure what scopes you need for what, use the [spotify docs references](https://developer.spotify.com/documentation).
```ts
const url = api.oauth.generateUrl([Scopes.Streaming, Scopes.UserModifyPlaybackState, Scopes.UserReadPlaybackState]);
```
From the callback urls query params you get a `code` with is used to fetch users access token from spotify.
```ts
const access = await api.oauth.fetchToken(code);
```
If you want to just play music or do other things with a user's player, you can create a [PartialUser](https://github.com/Luna-devv/lunify.js/blob/master/src/lib/structures/user/index.ts#L8) like that:
```ts
const user = new PartialUser(api, access);
user.player.play("4cOdK2wGLETKBW3PvgPWqT");
```
If you want to access to user's data you can just get it from the previously gotten access class
```ts
const user = await access.fetchUser();
user.player.play("4cOdK2wGLETKBW3PvgPWqT");
console.log(user.displayName)
```
### Getting tracks
**If you haven't already**, you should put this at the root of your project to fetch your client's credentials.
```ts
await api.fetchCredentials();
```
Getting a single track, note that all fetched data gets cached to not spam the api as much
```ts
const track = await api.tracks.fetch("4cOdK2wGLETKBW3PvgPWqT");
// or if you want to skip the cache
const track = await api.tracks.fetch("4cOdK2wGLETKBW3PvgPWqT", { force: true });
```
## Example
```ts
import fastify from 'fastify';
import { Lunify, UserOauth, Scopes, PartialUser } from 'lunify.js';
const app = fastify();
const api = new Lunify({
clientId: '898e127e95f24f578fdbfec93ae203cd',
clientSecret: 'dc302ea39cefbdf875f42f59e721e898',
oauth: {
redirectUri: 'http://localhost:3000/callback'
}
});
// Login and authorize this app to access your spotify account
// GET http://localhost:3000/login
app.get('/login', (req, res) => {
const url = api.oauth.generateUrl([Scopes.Streaming, Scopes.UserModifyPlaybackState, Scopes.UserReadPlaybackState]);
res.redirect(url);
});
let access: UserOauth | undefined;
// Callback to get your authorization code and fetch your user credentials (NOT spotify login credentials)
// GET http://localhost:3000/callback
app.get('/callback', async (req) => {
const code = (req.query as Record<string, string>).code || null;
const state = (req.query as Record<string, string>).state || null;
const error = (req.query as Record<string, string>).error || null;
if (error) return error;
if (!state) return 'Invalud state';
access = await api.oauth.fetchToken(code);
console.log(access)
return 'OK';
});
// Play a track on your current device, provide a track as query param (don't forget to remove all of spotifies tracking queries from their links)
// GET http://localhost:3000/play?track=https://open.spotify.com/track/0ZVjgfaC2Ptrod9v6p9KFP
app.get('/play', (req) => {
if (!access) return "You need to go to /login first"
const track = (req.query as Record<string, string>).track?.split('/track/')?.[1]?.split('?')[0];
if (!track) return 'No track id';
// We use PartialUser so we do not have to fetch user data to use it's player
const user = new PartialUser(api, access);
user.player.play(track);
return 'OK';
});
// Get your user data
// GET http://localhost:3000/me
app.get('/me', async () => {
if (!access) return "You need to go to /login first"
const user = await access.fetchUser();
console.log(user);
return 'OK';
});
// Fetch a track, provide a track as query param (don't forget to remove all of spotifies tracking queries from their links)
// GET http://localhost:3000/track?track=https://open.spotify.com/track/0ZVjgfaC2Ptrod9v6p9KFP
app.get('/track', async (req) => {
// or "api.fetchCredentials();" in the root of your project
if (!api.ready) await api.fetchCredentials();
const trackId = (req.query as Record<string, string>).track?.split('/track/')?.[1]?.split('?')[0];
if (!trackId) return 'No track id';
const track = await api.tracks.fetch(trackId);
console.log(track);
return 'OK';
});
// Let the webserver listen to that port
app.listen({ host: 'localhost', port: 3000 }, (err, address) => {
if (err) console.log(err);
console.log(`Listening to ${address}`);
});
```
## Documentation
Read the code or use your IDEs intellisense :)
## Star History
<a href="https://star-history.com/#Luna-devv/lunify.js&Date">
<picture>
<source media="(prefers-color-scheme: dark)" srcset="https://api.star-history.com/svg?repos=Luna-devv/lunify.js&type=Date&theme=dark" />
<source media="(prefers-color-scheme: light)" srcset="https://api.star-history.com/svg?repos=Luna-devv/lunify.js&type=Date" />
<img alt="Star History Chart" src="https://api.star-history.com/svg?repos=Luna-devv/lunify.js&type=Date" />
</picture>
</a>
| A basic object oriented, typed api wrapper for the spotify api | javascript,spotify,spotify-api,spotify-web-api,typescript | 2023-09-06T14:27:23Z | 2024-03-27T12:39:38Z | 2024-03-25T19:54:59Z | 2 | 2 | 48 | 1 | 1 | 5 | null | GPL-3.0 | TypeScript |
BaseMax/FileUploadExpressTS | main | # File Upload API using Express.js and TypeScript
This is a simple File Upload API built with Express.js and TypeScript. It allows users to upload and serve files, such as images or documents. You can customize this API for your specific needs and use it as a foundation for building file handling features in your applications.
## Features
- Upload files (images, documents, etc.) to the server.
- Serve uploaded files to clients.
- Error handling and validation for uploaded files.
- TypeScript support for improved code quality.
## Screenshots
#### manage users file with minio(object storage)
#### login user
#### register new user
#### upload file
#### upload from link
#### create directory
#### leaderboard
## Prerequisites
Before you begin, ensure you have met the following requirements:
- Node.js and npm installed on your development machine.
- Basic knowledge of Express.js and TypeScript.
## Installation
1. Clone this repository:
```bash
git clone https://github.com/BaseMax/FileUploadExpressTS.git
```
Navigate to the project directory:
```bash
cd FileUploadExpressTS
```
Install dependencies:
```bash
npm install
```
## Usage
Start the server:
```bash
npm start
```
The server will run on `http://localhost:3000` by default. You can customize the port and other settings in the configuration files.
To upload a file, make a POST request to /upload with a multipart/form-data body containing the file to be uploaded. You can use tools like curl, Postman, or any HTTP client library to interact with the API.
Example using curl:
```bash
curl -X POST -F "file=@path/to/your/file.jpg" http://localhost:3000/api/file/upload (with token HEADER)
```
Replace `path/to/your/file.jpg` with the path to the file you want to upload.
The uploaded file will be stored on the server (the default storage location is uploads/), and you will receive a response with information about the uploaded file, including its URL.
To access the uploaded file, make a GET request to the provided URL.
## API Routes
| # | Route | Description | Response Example |
| --- | ------------------------------------------- | --------------------------------------------------------------- | ----------------------------------------------------- |
| 1 | `/api/auth/register` | Register a new user account. | `{"message": "User registered successfully"}` |
| 2 | `/api/auth/login` | User login with credentials. | `{"token": "your-auth-token", "user": {...}}` |
| 3 | `/api/auth/logout` | User logout. | `{"message": "User logged out successfully"}` |
| 4 | `/api/auth/reset-password` | Reset user password. | `{"message": "Password reset link sent"}` |
| 5 | `/api/auth/forgot-password` | Forgot user password. | `{"message": "Password reset email sent"}` |
| 6 | `/api/file/upload` | Upload a file. | `{"message": "File uploaded successfully"}` |
| 7 | `/api/directory` | Create a new directory. | `{"message": "Directory created successfully"}` |
| 8 | `/api/file/move` | Move a file to a different location. | `{"message": "File moved successfully"}` |
| 9 | `/api/file/copy` | Copy a file to a different location. | `{"message": "File copied successfully"}` |
| 10 | `/api/file/upload-from-link` | Upload a file from a URL/link. | `{"message": "File uploaded from link successfully"}` |
| 11 | `/api/file/search` | Search for files by name or metadata. | `[{"id": 1, "name": "file1.jpg", ...}, ...]` |
| 12 | `/api/file/stats/:id` | View download statistics for a file. | `{"downloads": 100}` |
| 13 | `/api/file/leaderboard/` | Get the leaderboard of hot links. | `[{"file": "file1.jpg", "downloads": 100}, ...]` |
| 14 | `/api/file/:id` | Download a specific file by ID. | (File download response) |
| 15 | `/api/file/:id` | Delete a specific file by ID. | `{"message": "File deleted successfully"}` |
| 16 | `/api/file/rename/:id` | Rename a specific file by ID. | `{"message": "File renamed successfully"}` |
| 17 | `/api/file/uploads` | View a list of user's uploaded files. | `[{"file": "file1.jpg", "uploads": 10}, ...]` |
| 18 | `/api/user/profile` | Get user profile information. | `{"id": 1, "username": "example", ...}` |
| 19 | `/api/user/profile` | Update user profile information. | `{"message": "Profile updated successfully"}` |
| 20 | `/api/user/change-password` | Change user password. | `{"message": "Password changed successfully"}` |
| 21 | `/api/user/delete-account` | Delete user account. | `{"message": "User account deleted successfully"}` |
| 22 | `/api/user/downloads` | View a list of user's downloaded files. | `[{"file": "file1.jpg", "downloads": 5}, ...]` |
| 23 | `/api/user` | View a list of all registered users (admin only). | `[{"id": 1, "username": "user1", ...}, ...]` |
| 24 | `/api/file` | View a list of all files (admin only). | `[{"id": 1, "name": "file1.jpg", ...}, ...]` |
| 25 | `/api/file/admin/stats/:id` | View statistics for a specific file (admin only). | `{"downloads": 100}` |
| 26 | `/api/admin/user-stats/:id` | View statistics for a specific user (admin only). | `{"downloads": 500, "uploads": 200}` |
| |
| 27 | `/api/user/:id` | Delete a user account (admin only). | `{"message": "User account deleted successfully"}` |
| 28 | `/api/user` | Create a new user account (admin only). | `{"message": "User created successfully"}` |
| 29 | `/api/file/admin/:id` | Delete a specific file by ID (admin only). | `{"message": "File deleted successfully"}` |
| 30 | `/api/admin/view-user-downloads/:id` | View a list of a specific user's downloaded files (admin only). | `[{"file": "file1.jpg", "downloads": 5}, ...]` |
| 31 | `/api/admin/view-user-uploads/:id` | View a list of a specific user's uploaded files (admin only). | `[{"file": "file1.jpg", "uploads": 10}, ...]` |
| 32 | `/api/admin/change-user-password/:id` | Change a user's password (admin only). | `{"message": "User password changed successfully"}` |
| 33 | `/api/directory` | View a list of all directories (admin only). | `[{"id": 1, "name": "dir1", ...}, ...]` |
| 34 | `/api/directory/view-directory-content/:id` | View the contents of a directory by ID (admin only). | `[{"id": 1, "name": "file1.jpg", ...}, ...]` |
| 36 | `/api/directory/view-directory-stats/:id` | View statistics for a directory by ID (admin only). | `{"files": 10, "subdirectories": 5}` |
| 37 | `/api/user/set-user-role/:id` | Set the role of a user (admin only). | `{"message": "User role set successfully"}` |
## Configuration
You can customize the API's configuration by modifying the config.ts file. Here are some configuration options you can adjust:
- `UPLOAD_DIR`: The directory where uploaded files are stored.
- `PORT`: The port on which the server listens.
## Contributing
Contributions are welcome! If you find a bug or have a suggestion for improvement, please open an issue or create a pull request.
## License
This project is licensed under the MIT License. See the LICENSE file for details.
Remember to replace placeholders like `http://localhost:3000` with your actual server URL and provide more specific usage instructions if needed. Additionally, update the `LICENSE` file with the appropriate license for your project.
Coypright 2023, Max Base
| This is a simple File Upload API built with Express.js and TypeScript. It allows users to upload and serve files, such as images or documents. You can customize this API for your specific needs and use it as a foundation for building file handling features in your applications. | api,api-restful,express,express-js,express-ts,express-typescript,file-upload,file-upload-api,javascript,js | 2023-09-08T15:51:56Z | 2024-03-29T11:04:57Z | null | 1 | 7 | 59 | 1 | 0 | 5 | null | GPL-3.0 | TypeScript |
StrataLink/ScribeAI | main | # ScribeAI
### <pre> [Demo]() [Poster]() [Figma](https://www.figma.com/file/uRlyv0u3ywcwKSDXS3Q6Os/ScribeAI?type=design&node-id=0%3A1&mode=design&t=LeWEs396EQJZjmlN-1) [Frontend Architecture](https://github.com/StrataLink/ScribeAI/tree/main/client) [Backend Architecture](https://github.com/StrataLink/ScribeAI/tree/main/api)</pre>
## Overview
ScribeAI is an innovative full-stack web notes application designed to assist students. It uniquely combines speech-to-text capabilities with advanced generative summary AI, streamlining the note-taking process and enhancing learning efficiency.
## Installation Guide
To get ScribeAI up and running on your local machine, follow these simple steps:
### Clone the Repository
```
git clone https://github.com/StrataLink/ScribeAI.git
```
### Install Dependencies
Navigate to the project directory and install the necessary dependencies.
```
npm install
```
### Start the Backend
```
cd api
npm start
```
### Launch the Frontend (In a New Terminal)
```
cd client
npm start
```
## Technology Stack
- **Frontend:** ReactJS, JavaScript, HTML, CSS
- **Backend:** Python, NodeJS, ExpressJS, MongoDB
## Contributors
- Tashi Sherpa (Leader)
- Ryan Cheng
- Jason Chen
- Rachel Tsui
## License
- Licensed under the MIT License.
| A full-stack web notes application leveraging speech-to-text and generative summary AI to help students take notes in lectures. | hacktoberfest,javascript,mern-stack,open-source | 2023-08-31T14:06:13Z | 2023-11-28T21:50:30Z | null | 4 | 14 | 81 | 6 | 2 | 5 | null | MIT | JavaScript |
abhraneel2004/TrendyV1.1 | master | # InterHacktive 2K23 - Trendy
<br />
<div align="center">
Visit us @ <a target="_blank" rel="noopener noreferrer" href="https://abhraneel2004.github.io/TrendyV1.1/" >Trendy.com</a>
# Trendy
# One stop for Youth fashion
Trendy is an online shopping website that offers a variety of products, including clothing, accessories and home goods. Our mission is to provide __high-quality products__ that are both sustainable and affordable. we work with various brands to offer our customers a __wide range of options__, and we are committed to transparency in their sourcing and production practices. In addition to our online store, we also offers a magazine and blog with content related to fashion, lifestyle, and sustainability.
Trendy is an online shopping website that offers a variety of products, along with proper **analytics of website usage**, products purchased, and more. Additionally, it provides a personalized UI for different users.
<br/>
### To Get started
<b><a align="center" href="https://youtu.be/QvRGkbsZQqw">Watch Demo Video</a></b>
<br/>
## 😎😎About the project.😎😎
</div>
### ✨Why choose Trendy?✨
- In todays world where the youth is heavily inspired by the styles and trends that goes viral on various social media platforms Trendy provides a platform where the youth can keep up with the fashion and stay up to date with todays trends.
- Trendy eliminates the struggle of staying updated with the ever-evolving fashion trends, ensuring you're always ahead in style.
- Trendy alleviates the confusion of what to buy by offering curated recommendations that align with the latest trends.
### 🤯🤯 Some key features of this project🤯🤯
- Newest collection from the world's leading brands
- Interactive UI.
- Statistical analysis.
- Wide range of collections.
- Personalized UI.
### 😁Overview😁
- In the Landing page the user is given a variety of options. He can explore the different top trending products in different categories or get updated on the latest fashion news.
- The navigation bar in the front page has the Home, Shop and About us options just beside that we have the registration/create a profile button which can help user create an account.
- After creating an account the user will be able to see there personalised page which states various Statistical data based on the users spending.
- In the shop page we have the different products.
- In the about us page we have the various social medias of our platform and also the contact info of our team members.
### 👾Problems we faced👾
- As we are very new to using firebase we faced a lot of issues while creating the registration section.
- Designing an interesting layout and selecting the colour schemes for the users took some time and a lot of research.
- Making each and every page responsive was a very long and tedious process but we did it.
- Merge Conflicts
- Branch Management
- Pull Request Coordination
- Bug Tracking
- Version Compatibility
- Documentation Consistency <br>
<br>
**These challenges taught us valuable lessons in communication, collaboration, version control, and GitHub workflows. Sharing our experiences to aid fellow developers in similar projects.**
### 📈Future plans📈
- Product analysis
- Implementation of AI for enhancing user experience.
### ⚙️Built with⚙️
- HTML5 - Basic structure.
- CSS - Styling.
- SCSS - Styling.
- JS - For the backend.
- Firebase - For the login and sign up.
- Figma - For design and mockups.
- NPM - To manage firebase.
## Contributing
This website is a work in progress. So any suggestions or updates will be well appreciated.To contribute to this project
1. Fork the Project
2. Create your Feature Branch (`git checkout -b feature/Feature1`)
3. Commit your Changes (`git commit -m 'Write what feature you added'`)
4. Push to the Branch (`git push origin feature/Feature1`)
5. Open a Pull Request
## More Description on Notion
- <b><a align="center" href="https://www.notion.so/Trendy-5caa62e2c4aa42a1adfb108ed365b001?pvs=4">Click here to know about **Trendy**</a></b>
## Meet our team
- <b><a align="center" href="https://github.com/abhraneel2004">Abhraneel Karmakar.</a></b>
- <b><a align="center" href="https://github.com/ShayWonTon">Sayantan Sen.</a></b>
- <b><a align="center" href="https://github.com/anannya07">Anannya Guchait.</a></b>
- <b><a align="center" href="https://github.com/Ayandi999">Ayandip Pal.</a></b>
| Trendy : One stop for Youth fashion | css3,figma,figma-plugin,figma-to-html,firebase,firebase-auth,firebase-database,git,gitbash,github | 2023-08-27T04:52:24Z | 2023-08-31T20:28:03Z | null | 4 | 22 | 129 | 0 | 3 | 5 | null | null | HTML |
neopromic/for-devs | main | <div>
<img src="https://for-devs.vercel.app/assets/favicon.ico" />
<h1> ForDevs, um lugarzinho pra chamar de seu. ☕</h1>
</div>
[](https://www.npmjs.com/package/react)
[](https://www.npmjs.com/package/react)
## Links úteis 😎
[🚀 Ver o site](https://for-devs.vercel.app/)
___
### Features ✨
As features serão separas por features **front-end** e **back-end**, o foco primário é o front (início de dev), após isso passamos para a fase de desenvolvimento back-end do projeto.
### Front-end Features (interfaces) 🎨
1. **Criar a interface home**
- [x] Criar os cards de postagens (recentes, etc)
- [ ] Criar o perfil de usuário
- [ ] Criar a visualização dos posts
- [ ] Criar o editor para os posts (para criar os posts, necessitamos de um editor de texto)
2. **Criar a página de login**
- [x] Implementar a página de login
3. **Criar a página de registro**
- [x] Implementar a página de registro
4. **Adicionar o react-router-dom**
- [x] Configurar e integrar o react-router-dom para navegação
5. **Dark Mode 🌙**
- [x] Implementar um modo escuro para melhorar a experiência do usuário
6. **Notificações Push 🔔**
- [ ] Adicionar suporte para notificações push em tempo real
7. **Integração com Redes Sociais 🌐**
- [ ] Permitir login via redes sociais como Google, GitHub, etc.
8. **Sistema de Comentários 💬**
- [ ] Desenvolver um sistema robusto de comentários para interação entre usuários
9. **Página de Configurações ⚙️**
- [ ] Criar uma página para que os usuários possam personalizar suas configurações
10. **Busca Avançada 🔍**
- [ ] Implementar uma barra de busca avançada para facilitar a pesquisa de conteúdo
...
### Back-end Features 🖥️
1. **Implementar um banco de dados**
- [x] Criar o sistema de login e cadastro
- [ ] Criar o sistema de postagens
- [ ] ...
2. **Notificações Push 🔔**
- [ ] Configurar o envio de notificações push em tempo real
3. **Sistema de Comentários 💬**
- [ ] Desenvolver a lógica e estrutura para o sistema de comentários
4. **Integração com API de Terceiros 🔄**
- [ ] Permitir integração com APIs externas para enriquecer as funcionalidades
5. **Ranking de Usuários 🏆**
- [ ] Criar um sistema de ranking para reconhecer e destacar usuários ativos
6. **Aprimoramento da UI/UX 🎨**
- [ ] Continuar refinando a interface para uma experiência mais fluida e agradável
7. **Sistema de Recompensas 🎁**
- [ ] Introduzir um sistema de recompensas para incentivar a participação ativa na comunidade
___
# Contribuindo para o forDevs 🚀
Bem-vindo ao forDevs! Estamos animados por você querer contribuir. Aqui está o guia passo a passo:
## 1. Clone o Repositório
Abra seu terminal e digite o seguinte comando:
```sh
git clone https://github.com/neopromic/for-devs.git
```
## 2. Instale as Dependências
Vá até a pasta do projeto e instale todas as dependências usando:
```sh
pnpm i
```
Certifique-se de ter o [pnpm instalado](link-para-pnpm).
## 3. Execute Localmente
Para iniciar o projeto em sua máquina, utilize:
```sh
pnpm run dev
```
O projeto agora deve estar rodando localmente!
> **Nota:** Utilizamos o pnpm como gerenciador de pacotes neste projeto.
## 4. Sua Mágica é Necessária ✨
Agora que o projeto está em execução, mergulhe no código! Resolva problemas, adicione novos recursos e divirta-se experimentando.
## 5. Documentação Detalhada
Para compreender melhor a estrutura do projeto, boas práticas e padrões de codificação, consulte nossa [documentação detalhada](link-para-documentacao).
## 6. Comunique-se e Inspire-se
Participe da nossa comunidade no [discord](link-para-forum) para discussões e ajuda. Busque inspiração em problemas abertos ou adicione os seus.
Esperamos ansiosamente por sua contribuição para tornar o forDevs ainda mais incrível! 🚀
---
# Autor:
[Wesley - Neopromic](https://github.com/neopromic)
| A React-based forum tailored for developers to connect and collaborate. 🌙 | reactjs,javascript,react,challanges,community,community-project,developer-showcase,firebase,framework,frontend | 2023-08-16T20:27:11Z | 2023-12-04T03:22:46Z | null | 1 | 100 | 124 | 0 | 0 | 5 | null | MIT | TypeScript |
alwinsimon/Ds-in-Js | main | # Ds in Js
Ds in Js is a repository that contains implementations of various basic data structures and algorithms in JavaScript. Whether you are a beginner looking to learn about data structures and algorithms or an experienced developer looking for a quick reference, this repository has you covered.
## Table of Contents
- [Introduction](#introduction)
- [Data Structures](#data-structures)
- [Linked List](#linked-list)
- [String](#string)
- [Binary Search Tree](#binary-search-tree)
- [Graph](#graph)
- [Hash Table](#hash-table)
- [Heap](#heap)
- [Stack](#stack)
- [Queue](#queue)
- [Trie](#trie)
- [Algorithms](#algorithms)
- [Recursion](#recursion)
- [Selection Sort](#selection-sort)
- [Insertion Sort](#insertion-sort)
- [Bubble Sort](#bubble-sort)
- [Merge Sort](#merge-sort)
- [Quick Sort](#quick-sort)
- [Getting Started](#getting-started)
- [Contributing](#contributing)
- [License](#license)
## Introduction
Understanding data structures and algorithms is fundamental for any programmer. This repository aims to provide clear and concise implementations of various data structures and algorithms in JavaScript. Each data structure and algorithm is implemented in its own individual file, making it easy to find and use the code.
## Data Structures
### Linked List
A basic singly linked list implementation.
### String
Basic string manipulation functions.
### Binary Search Tree
A binary search tree data structure and relevant operations.
### Graph
A graph data structure and common graph algorithms.
### Hash Table
A hash table (hash map) implementation.
### Heap
A binary heap data structure and common heap operations.
### Stack
A stack data structure.
### Queue
A queue data structure (implemented using arrays and linked lists).
### Trie
A trie data structure for efficient string searching.
## Algorithms
### Recursion
Examples of recursive algorithms and functions.
### Selection Sort
An implementation of the selection sort algorithm.
### Insertion Sort
An implementation of the insertion sort algorithm.
### Bubble Sort
An implementation of the bubble sort algorithm.
### Merge Sort
An implementation of the merge sort algorithm.
### Quick Sort
An implementation of the quick sort algorithm.
| Ds in Js is a repository that contains implementations of various basic data structures and algorithms in JavaScript. Whether you are a beginner looking to learn about data structures and algorithms or an experienced developer looking for a quick reference, this repository has you covered. | algorithms-and-data-structures,begginer-friendly,contributions-welcome,data-structures,dsa-algorithm,javascript,js | 2023-08-30T07:39:19Z | 2023-09-02T06:51:12Z | null | 1 | 0 | 26 | 0 | 0 | 5 | null | null | JavaScript |
AJAY2-R/Library-management-system | main | ## Library management system
Welcome to the Library Management System GitHub repository! This web application is designed to simplify the management of books, members, and transactions within a local library. With a user-friendly interface and essential features, this tool aims to enhance the overall efficiency and organization of library operations.
## Required Tools
- **Python:** The application is built using Python, a versatile programming language known for its simplicity and readability.
- **Flask:** Flask is used to create the web application, providing a microframework for building web solutions.
- **Flask-SQLAlchemy:** This extension simplifies database interactions and management within the Flask application.
- **SQLite:** SQLite is the chosen database engine, offering lightweight and efficient data storage.
## Getting Started
1. Clone this repository to your local machine using: `git clone https://github.com/AJAY2-R/Library-management-system.git`
2. Install the required packages using `pip install -r requirements.txt`.
3. Set up the database using `flask db init`, `flask db migrate`, and `flask db upgrade`.
4. Run the application using `flask run` and access it in your browser at `http://127.0.0.1:5000`.
5. Explore the different features, including book management, member information, and transaction tracking.
## Screenshots
Here are a few screenshots showcasing the interface and functionalities of the Library Management System:
## Contributions
Contributions to this project are welcome! Feel free to fork the repository, make your improvements, and submit a pull request. If you encounter any issues or have ideas for enhancements, please open an issue in the repository.
## License
This project is licensed under the MIT License - see the [LICENSE](LICENSE) file for details.
---
With the Library Management System, we aim to make library operations smoother and more organized. We hope this tool proves valuable to libraries and their patrons. If you have any questions or feedback, please don't hesitate to reach out!
| This web application is designed to simplify the management of books, members, and transactions within a local library. With a user-friendly interface and essential features, this tool aims to enhance the overall efficiency and organization of library operations.With API integration.Project developed using python flask | css,flask,html,javascript,python,sqlalchemy,sqlite3,webapp,webapplication,library-database | 2023-08-26T20:29:10Z | 2023-08-27T06:50:15Z | null | 1 | 0 | 19 | 0 | 1 | 5 | null | null | Python |
patrickmps/fullstackopen | main | null | Meu repositório com os exercícios do curso aberto de desenvolvimento full stack da Universidade de Helsinki. | css,cypress,fullstack,graphql,html5,javascript,jest,nodejs,react,react-native | 2023-09-07T22:55:27Z | 2024-02-08T23:51:39Z | null | 1 | 1 | 88 | 0 | 0 | 5 | null | MIT | JavaScript |
devschlumpfi/Code-Snippets | main | <br/>
<p align="center">
<a href="https://github.com/devschlumpfi/Code-Snippets">
<img src="https://images-ext-2.discordapp.net/external/43oLDXAFJUfZWIsZy-ScqhbjhWOdZZNL6iUTtVH0khc/https/cdn.discordapp.com/avatars/1133730318621356063/c44313c8e72e7930ac8a614a08e43ce4.webp" alt="Logo" width="80" height="80">
</a>
<h3 align="center">Code-Snippets</h3>
<p align="center">
Great codes for beginners and advanced programmers!
<br/>
<br/>
<a href="https://github.com/devschlumpfi/Code-Snippets/issues">Report Bug</a>
.
<a href="https://github.com/devschlumpfi/Code-Snippets/issues">Request Feature</a>
</p>
</p>
## About The Project
These codes should help people and are not all from me but also from other people so your code should be there write me a DM on discord so I wish you a lot of fun programming and there will be more to come don't worry ❤️
| Great codes for beginners and advanced programmers! | code,codesnippets,discord,discord-api,discord-bot,discord-bots,discord-js,discord-py,discordbot,discordjs | 2023-08-21T18:25:04Z | 2023-08-23T12:02:57Z | 2023-08-22T17:59:38Z | 1 | 0 | 13 | 0 | 2 | 5 | null | Apache-2.0 | Python |
duynghiadev/Learn-Code-Youtube | master | null | The above projects are learned from YouTube | react,responsive,restful-api,scss,vite,css3,html5,javascript | 2023-08-29T15:43:22Z | 2024-05-23T10:24:22Z | null | 1 | 1,197 | 2,831 | 0 | 5 | 5 | null | null | JavaScript |
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