id int64 5 1.93M | title stringlengths 0 128 | description stringlengths 0 25.5k | collection_id int64 0 28.1k | published_timestamp timestamp[s] | canonical_url stringlengths 14 581 | tag_list stringlengths 0 120 | body_markdown stringlengths 0 716k | user_username stringlengths 2 30 |
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1,890,131 | Efficiently Managing Remote Data in Vue with Vue Query | When building modern Vue applications, efficiently managing remote data is crucial for creating... | 0 | 2024-06-16T07:29:49 | https://dev.to/alimetehrani/efficiently-managing-remote-data-in-vue-with-vue-query-192h | vue, vuequery, tanstack | When building modern Vue applications, efficiently managing remote data is crucial for creating responsive and user-friendly interfaces. Vue Query, inspired by React Query, provides powerful hooks for fetching, caching, and synchronizing server state in your Vue applications. In this post, we'll explore three essential hooks: `useQuery`, `useQueryClient`, and `useMutation`, and how they can transform your data management approach.
### Introduction to Vue Query
Vue Query simplifies data fetching and state management by providing hooks that handle the complexities of remote data. It helps in reducing boilerplate code and ensures data consistency across your application. Let’s dive into the three key hooks and understand their usage.
### `useQuery`: Simplified Data Fetching
`useQuery` is a fundamental hook for fetching data from an API and managing the loading, error, and success states. It's ideal for simple data-fetching needs where you want to display data and handle the associated states.
#### Example: Fetching Todos
```javascript
import { useQuery } from 'vue-query'
import { fetchTodos } from '@/api'
export default {
setup() {
const { data, error, isLoading } = useQuery('todos', fetchTodos)
return {
todos: data,
error,
isLoading
}
}
}
```
In this example, `useQuery` fetches a list of todos from the `fetchTodos` API function. It returns `data`, `error`, and `isLoading` states that you can use in your template to display the data or show loading and error messages.
### `useQueryClient`: Advanced Query Management
While `useQuery` handles individual queries, `useQueryClient` gives you access to the query client, enabling advanced operations like invalidating, refetching, and updating queries. It’s useful for managing global query state and ensuring data consistency.
#### Example: Invalidating Queries
```javascript
import { useQueryClient } from 'vue-query'
export default {
setup() {
const queryClient = useQueryClient()
const invalidateTodos = () => {
queryClient.invalidateQueries('todos')
}
return {
invalidateTodos
}
}
}
```
In this example, `useQueryClient` is used to get the query client instance. The `invalidateTodos` function invalidates the `todos` query, forcing it to refetch the data. This is particularly useful after performing data mutations to ensure the UI reflects the latest server state.
### `useMutation`: Managing Data Modifications
`useMutation` is designed for data-modifying operations like creating, updating, or deleting data. It handles the various states (loading, error, success) and provides options for optimistic updates and side-effect management.
#### Example: Creating a Todo
```javascript
import { useMutation, useQueryClient } from 'vue-query'
import { addTodo } from '@/api'
export default {
setup() {
const queryClient = useQueryClient()
const mutation = useMutation(addTodo, {
onSuccess: () => {
queryClient.invalidateQueries('todos')
},
onError: (error) => {
console.error('Error adding todo:', error)
}
})
const createTodo = async (newTodo) => {
try {
await mutation.mutateAsync(newTodo)
} catch (error) {
console.error('Error during mutation:', error)
}
}
return {
createTodo,
mutation
}
}
}
```
In this example, `useMutation` handles the addition of a new todo. Upon success, it invalidates the `todos` query to refetch the updated list. You can also manage errors and other side effects through the provided callbacks.
### Advanced Usage: Optimistic Updates
Optimistic updates enhance the user experience by immediately updating the UI before the server confirms the mutation. This can make your application feel more responsive.
#### Example: Optimistic Updates
```javascript
import { useMutation, useQueryClient } from 'vue-query'
import { addTodo } from '@/api'
export default {
setup() {
const queryClient = useQueryClient()
const mutation = useMutation(addTodo, {
onMutate: async (newTodo) => {
await queryClient.cancelQueries('todos')
const previousTodos = queryClient.getQueryData('todos')
queryClient.setQueryData('todos', old => [...old, newTodo])
return { previousTodos }
},
onError: (err, newTodo, context) => {
queryClient.setQueryData('todos', context.previousTodos)
console.error('Error adding todo:', err)
},
onSettled: () => {
queryClient.invalidateQueries('todos')
}
})
const createTodo = async (newTodo) => {
try {
await mutation.mutateAsync(newTodo)
} catch (error) {
console.error('Error during mutation:', error)
}
}
return {
createTodo,
mutation
}
}
}
```
In this example, `onMutate` performs an optimistic update by immediately adding the new todo to the local state. If the mutation fails, `onError` rolls back to the previous state using the context object.
### Conclusion
Vue Query, with its powerful hooks like `useQuery`, `useQueryClient`, and `useMutation`, provides a robust solution for managing remote data in Vue applications. By simplifying data fetching, synchronization, and state management, it helps you build responsive and efficient applications with less boilerplate code.
Whether you’re fetching data, invalidating queries, or performing optimistic updates, Vue Query streamlines the process, making it easier to keep your UI in sync with your server state. Embrace these hooks to elevate your Vue development experience and deliver seamless user interactions. | alimetehrani |
1,890,130 | Let's practice writing clean, reusable components in react | 🔑 Key Concepts What are reusable React components? Think of them as building... | 0 | 2024-06-16T07:23:49 | https://dev.to/codewithshahan/lets-practice-clean-reusable-components-in-react-5flj | webdev, javascript, beginners, react | ## 🔑 Key Concepts
**What are reusable React components?** Think of them as building blocks.
They're pieces of code you can use in different parts of your website to save time. They can be anything from simple buttons to complex forms.
### **Why Use Reusable Components?**
They make it easy to add new features and improve your code's scalability. Plus, you can use them in future projects without rewriting.
---
## 🧩 How to Write Clean, Reusable React Components
Two key points:
**1. Avoid Side Effects:** Don't include logic that interacts with external data (like API calls) directly in your component. Instead, pass this logic as `props`.
Example of a simple but non-reusable button:
```jsx
const Button = () => {
return (
<button>Click Me</button>
);
}
```
This button lacks flexibility because the text is hardcoded.
**2. Use Props:** Props are arguments you pass to a component to customize it.
Example of a better button:
```jsx
const Button = ({ color, label }) => {
return (
<button style={{ backgroundColor: color }}>{label}</button>
);
}
```
This button can have different colors and labels, making it more reusable.
### **Challenge:**
Think about how your component might be used in different situations and design it to be flexible.
---
## 🍃 Examples of Reusable React Components
**1. Buttons:** Customize them with different styles and functions.
```jsx
const Button = ({ color, label, onClick }) => {
return (
<button style={{ backgroundColor: color }} onClick={onClick}>
{label}
</button>
);
};
// Using the Button component
<Button color="blue" label="Click Here" onClick={() => console.log("Button clicked!")} />
```
**2. Navbars:** Consistent navigation across your website.
```jsx
const Navbar = ({ isLoggedIn }) => {
return (
<div className="navbar">
<a href="/">Home</a>
<a href="/about">About</a>
<a href="/contact">Contact</a>
{isLoggedIn ? <a href="/profile">Profile</a> : <a href="/login">Login</a>}
</div>
);
};
// Using the Navbar component
<Navbar isLoggedIn={true} />
```
**3. Why Avoid API Calls in Components**
Including side-effects like API calls in your components reduces reusability. Pass the side-effect as a prop instead:
```jsx
const SaveButton = ({ onClick, label }) => {
return (
<button onClick={onClick}>
{label}
</button>
);
};
// Using SaveButton
<SaveButton onClick={saveUser} label="Save User" />
<SaveButton onClick={saveProject} label="Save Project" />
```
---
Building components without proper visualization first can be overwhelming. For design, Figma is a fantastic tool used by developers for creating web design components and prototypes. It's popular for its clean UI and collaborative features. you can [sign up here](https://psxid.figma.com/0s98tq) for free.
---
## 👏 Conclusion
Congrats! You’ve learned how to create clean, reusable React components. They are the foundation of robust React development. The more you practice, the better you'll get at using them in your projects.
If you enjoyed this, follow me on [𝕏](https://twitter.com/shahancd) for more front-end development tips.
**Read More:** [The Future of Frontend Development](https://dev.to/codewithshahan/the-future-of-frontend-development-1amd) | codewithshahan |
1,890,076 | Full Backup in Nodejs(Files and Database backup) | NodeFullBackup is an npm package crafted specifically for comprehensive backup solutions. It... | 0 | 2024-06-16T07:08:01 | https://dev.to/hosseinmobarakian/full-backup-in-nodejsfiles-and-database-backup-2a9f | javascript, webdev, tutorial, node | [NodeFullBackup](https://github.com/hosseinmobarakian/node-full-backup) is an npm package crafted specifically for comprehensive backup solutions. It seamlessly integrates MongoDB backup functionality with file backup capabilities, ensuring that all your critical data is securely preserved. This package is ideal for anyone looking to enhance their data resilience strategy without the hassle of managing multiple backup tools.
### Installation
Getting started with [NodeFullBackup](https://github.com/hosseinmobarakian/node-full-backup) is quick and easy. Simply install the package via npm using the following command:
```bash
npm i @double-man/node-full-backup
```
### Simple Usage
Integrating NodeFullBackup into your project requires minimal effort. Just copy the snippet below into your codebase:
```javascript
import FullBackup from '@double-man/node-full-backup';
const backup = new FullBackup({
outputPath: path.resolve('./backup'),
folders: [path.resolve('./public')],
expireDays: '1d',
cronExpression: '0 */6 * * *',
database: {
username: 'database_username',
password: 'database_password',
database: 'database_name',
host: 'localhost',
port: 27017
}
});
backup.start();
```
> Your support helps this [repository](https://github.com/hosseinmobarakian/node-full-backup) grow. Please consider starring it if you find it useful!
### Parameters
NodeFullBackup offers a wide range of parameters to tailor your backup process according to your specific needs. Here’s a breakdown of the available options:
| Parameter | Type | Description |
|--------------------|----------|------------------------------------------------------------------|
| outputPath | String | Destination folder path for backup files. |
| outputNamePrefix | String | Prefix for backup file names. |
| cronExpression | String | Cron expression for scheduling backups. |
| outputType | String | Format of the output file ('zip' or 'tar'). |
| files | String[] | Array of file paths to include in the backup. |
| folders | String[] | Array of folder paths to include in the backup. |
| expireDays | String | Number of days after which old backup files will be removed. |
| afterBackup | Function | Callback function providing access to the backup file path. |
| database | Object | Configuration details for MongoDB database backup. |
### Database Configuration
When configuring MongoDB backups, ensure you provide the necessary details:
| Parameter | Type | Description |
|------------|---------|-------------------------------------------|
| username | String | Username for database access. |
| password | String | Password for database access. |
| database | String | Name of the MongoDB database to backup. |
| host | String | Host address of the MongoDB database. |
| port | Number | Port number for MongoDB connection. |
### Upload Backup To Google Drive
NodeFullBackup supports seamless integration with Google Drive for automated backup uploads. Implement the following within the `afterBackup` callback:
```javascript
import FullBackup, { uploader } from '@double-man/node-full-backup';
const backup = new FullBackup({
...
afterBackup: (filePath) => {
uploader.googleDrive(path_of_google_key_json, filePath, google_drive_folder_id);
}
});
backup.start();
```
Ensure you obtain your Google JSON key as described in the guide and activate Google Drive service to enable automated uploads.
### Conclusion
NodeFullBackup offers a robust solution for MongoDB database and file backups, tailored to meet the needs of developers and organizations alike. By integrating NodeFullBackup into your workflow, you can enhance data protection with minimal effort, ensuring your projects are safeguarded against data loss effectively.
Explore our documentation further to learn how NodeFullBackup can strengthen your backup strategy and provide a reliable safety net for your digital assets. Get started today and fortify your data resilience with NodeFullBackup. | hosseinmobarakian |
1,890,077 | We are haotees.com | Sleep Tight in Braves Country: The Atlanta Braves Bedding Set Calling all Atlanta Braves fans! Take... | 0 | 2024-06-16T07:07:33 | https://dev.to/nguyen_hao_cfe2a1626f5e74/we-are-haoteescom-1ffl | Sleep Tight in Braves Country: The Atlanta Braves Bedding Set
Calling all Atlanta Braves fans! Take your fandom to dreamland with the officially licensed Atlanta Braves bedding set. This comfortable and stylish set lets you surround yourself with the team’s colors and logos, transforming your bedroom into a celebration of Braves baseball.
Deck Out Your Bed in Atlanta Braves Spirit with This Bedding Set
Beyond the Jersey: A Cozy Haven for Braves Fans
Ditch the generic sheets and elevate your sleep sanctuary with the Atlanta Braves bedding set. Crafted from soft and breathable materials, this set ensures maximum comfort while showcasing your unwavering support for the Braves. The comforter and pillowcases feature bold designs that incorporate the iconic Braves colors (navy blue, red, and white) and logos. Imagine a comforter emblazoned with the tomahawk logo, or a design featuring scattered baseballs and bats in team colors – this bedding set lets you bring the excitement of Truist Park right into your bedroom.
A Design for Every Fan’s Sleep Style
The beauty of the Atlanta Braves bedding set lies in its ability to cater to a variety of tastes. Classic designs might feature a prominent Braves logo displayed on the comforter for a bold statement of your die-hard fandom. For a more subtle approach, there are options with smaller logos or text designs incorporating the team name or iconic slogans like “Chop On” or “Atlanta Strong.” Some sets might even pay homage to Braves history with vintage-inspired logos or player-specific details, allowing you to showcase your love for a specific era or a favorite Braves legend like Hank Aaron or Chipper Jones.
Deck Out Your Bed in Atlanta Braves Spirit with This Bedding Set
Beyond Game Day: A Year-Round Celebration of Braves Country
The Atlanta Braves bedding set isn’t just for the baseball season. Its comfortable design and team spirit make it a perfect addition to your bedroom year-round. Snuggle up under the covers and dream of walk-off home runs on chilly nights, or stay cool and represent the Braves during the hot Atlanta summer. This bedding set is sure to be a conversation starter with fellow fans, no matter what time of year it is.
More Than Just Comfort: A Badge of Braves Fandom
Owning an Atlanta Braves bedding set is more than just having a comfortable place to sleep; it’s a badge of honor that signifies your membership in the passionate Braves fanbase. It’s a way to express your fandom in a unique way, to connect with fellow fans over shared memories and a love for the game, and to represent the Braves with pride even when you’re catching some Zzz’s. So grab your Atlanta Braves bedding set today, bring the excitement of Braves baseball into your bedroom, and sleep tight knowing you’re repping your team in style!
From [haotees](https://haotees.com/deck-out-your-bed-in-atlanta-braves-spirit-with-this-bedding-set/)
| nguyen_hao_cfe2a1626f5e74 | |
1,890,075 | Compare CSS Online: A Guide to Streamlining Your Web Development | https://ovdss.com/apps/compare-css-online In the fast-paced world of web development, efficiency and... | 0 | 2024-06-16T07:00:46 | https://dev.to/johnalbort12/compare-css-online-a-guide-to-streamlining-your-web-development-1m8h | ERROR: type should be string, got "\n\n\n\n\n\n\n\n\n\nhttps://ovdss.com/apps/compare-css-online\n\n\nIn the fast-paced world of web development, efficiency and accuracy are paramount. One of the crucial aspects of creating and maintaining websites is managing CSS (Cascading Style Sheets). CSS defines the look and feel of a website, controlling everything from layout to colours and fonts. Comparing CSS files to identify differences and merge changes is a common task for developers, particularly when collaborating on projects or updating legacy code. In this blog post, we'll explore the benefits of comparing CSS files online and how it can streamline your web development process.\n\nWhy Compare CSS Files\n\nBefore diving into the tools and methods for comparing CSS files online, it's essential to understand why this process is beneficial:\n1. Version Control\nWeb development often involves multiple developers working on the same project. Comparing CSS files allows you to track changes made by different team members, ensuring that no critical updates are lost and conflicts are resolved efficiently.\n2. Bug Fixing\nCSS bugs can be notoriously difficult to track down. By comparing versions of your CSS, you can pinpoint exactly when and where an issue was introduced, making it easier to debug and fix.\n3. Optimization\nOver time, CSS files can become bloated with unused or redundant styles. Comparing CSS files helps identify and remove unnecessary code, leading to cleaner, more efficient stylesheets.\n4. Merging Changes\nWhen updating a website, you might have multiple CSS files with different modifications. Comparing these files allows you to merge changes seamlessly, ensuring a consistent design across the site.\n\n\nHow to Compare CSS Files Online\n\n\nUsing online tools to compare CSS files is generally straightforward. Here’s a step-by-step guide to get you started:\nStep 1: Choose Your Tool\nSelect the online tool that best fits your needs. For this example, we'll use Diffchecker.\nStep 2: Upload Your CSS Files\nMost tools allow you to upload files directly from your computer or paste the CSS code into text boxes. Upload the two CSS files you want to compare.\nStep 3: Analyse the Comparison\nThe tool will display a side-by-side comparison of the two files, highlighting differences. Review the changes carefully, noting any conflicts or areas that need merging.\nStep 4: Resolve Differences\nMake the necessary changes to your CSS files based on the comparison. If the tool supports merging, you can often do this directly within the interface.\nStep 5: Save and Test\nOnce you’ve resolved the differences, save the updated CSS file and test it on your website to ensure everything looks and functions as expected.\n\nConclusion\nComparing CSS files online is a valuable skill for web developers, helping to maintain clean, efficient, and bug-free stylesheets. By utilising online tools, you can streamline your workflow, enhance collaboration, and ensure your website looks its best. Whether you’re a solo developer or part of a team, mastering CSS comparison will undoubtedly improve your web development process.\n\n" | johnalbort12 | |
1,890,073 | Updating Non-Primitive Data in an Array Using Transactions and Rollbacks | Introduction In this blog, we will explore how to update both primitive and non-primitive... | 0 | 2024-06-16T06:51:46 | https://dev.to/md_enayeturrahman_2560e3/updating-non-primitive-data-in-an-array-using-transactions-and-rollbacks-5g24 | javascript, mongoose, mongodb, express | ### Introduction
In this blog, we will explore how to update both primitive and non-primitive data in a MongoDB document using Mongoose. We will specifically focus on updating arrays within documents. Our approach will leverage transactions and rollbacks to ensure data integrity during the update process. We will walk through defining the data types, creating Mongoose schemas, implementing validation with Zod, and finally, updating the data with transaction handling in the service layer.
- This is the thirteenth blog of my series where I am writing how to write code for an industry-grade project so that you can manage and scale the project.
- The first twelve blogs of the series were about "How to set up eslint and prettier in an express and typescript project", "Folder structure in an industry-standard project", "How to create API in an industry-standard app", "Setting up global error handler using next function provided by express", "How to handle not found route in express app", "Creating a Custom Send Response Utility Function in Express", "How to Set Up Routes in an Express App: A Step-by-Step Guide", "Simplifying Error Handling in Express Controllers: Introducing catchAsync Utility Function", "Understanding Populating Referencing Fields in Mongoose", "Creating a Custom Error Class in an express app", "Understanding Transactions and Rollbacks in MongoDB", "Updating Non-Primitive Data Dynamically in Mongoose", "How to Handle Errors in an Industry-Grade Node.js Application" and "Creating Query Builders for Mongoose: Searching, Filtering, Sorting, Limiting, Pagination, and Field Selection". You can check them in the following link.
https://dev.to/md_enayeturrahman_2560e3/how-to-set-up-eslint-and-prettier-1nk6
https://dev.to/md_enayeturrahman_2560e3/folder-structure-in-an-industry-standard-project-271b
https://dev.to/md_enayeturrahman_2560e3/how-to-create-api-in-an-industry-standard-app-44ck
https://dev.to/md_enayeturrahman_2560e3/setting-up-global-error-handler-using-next-function-provided-by-express-96c
https://dev.to/md_enayeturrahman_2560e3/how-to-handle-not-found-route-in-express-app-1d26
https://dev.to/md_enayeturrahman_2560e3/creating-a-custom-send-response-utility-function-in-express-2fg9
https://dev.to/md_enayeturrahman_2560e3/how-to-set-up-routes-in-an-express-app-a-step-by-step-guide-177j
https://dev.to/md_enayeturrahman_2560e3/simplifying-error-handling-in-express-controllers-introducing-catchasync-utility-function-2f3l
https://dev.to/md_enayeturrahman_2560e3/understanding-populating-referencing-fields-in-mongoose-jhg
https://dev.to/md_enayeturrahman_2560e3/creating-a-custom-error-class-in-an-express-app-515a
https://dev.to/md_enayeturrahman_2560e3/understanding-transactions-and-rollbacks-in-mongodb-2on6
https://dev.to/md_enayeturrahman_2560e3/updating-non-primitive-data-dynamically-in-mongoose-17h2
https://dev.to/md_enayeturrahman_2560e3/how-to-handle-errors-in-an-industry-grade-nodejs-application-217b
https://dev.to/md_enayeturrahman_2560e3/creating-query-builders-for-mongoose-searching-filtering-sorting-limiting-pagination-and-field-selection-395j
### Defining Data Types
We begin by defining the data types for our course documents
```javascript
import { Types } from 'mongoose';
export type TPreRequisiteCourses = { // Type for PreRequisiteCourses that will be inside an array
course: Types.ObjectId;
isDeleted: boolean;
};
// Data structure of our document with one non-primitive and five primitive values
export type TCourse = {
title: string;
prefix: string;
code: number;
credits: number;
isDeleted?: boolean;
preRequisiteCourses: [TPreRequisiteCourses];
};
```
### Mongoose Schema and Model
Next, we create the Mongoose schemas and models for our course data.
```javascript
import { Schema, model } from 'mongoose';
import {
TCourse,
TPreRequisiteCourses,
} from './course.interface';
const preRequisiteCoursesSchema = new Schema<TPreRequisiteCourses>(
{
course: {
type: Schema.Types.ObjectId,
ref: 'Course',
},
isDeleted: {
type: Boolean,
default: false,
},
},
{
_id: false,
},
);
const courseSchema = new Schema<TCourse>({
title: {
type: String,
unique: true,
trim: true,
required: true,
},
prefix: {
type: String,
trim: true,
required: true,
},
code: {
type: Number,
trim: true,
required: true,
},
credits: {
type: Number,
trim: true,
required: true,
},
preRequisiteCourses: [preRequisiteCoursesSchema],
isDeleted: {
type: Boolean,
default: false,
},
});
export const Course = model<TCourse>('Course', courseSchema);
```
### Zod Validation
We use Zod for validation to ensure the data being created or updated adheres to the expected schema.
```javascript
import { z } from 'zod';
const PreRequisiteCourseValidationSchema = z.object({
course: z.string(),
isDeleted: z.boolean().optional(),
});
const createCourseValidationSchema = z.object({
body: z.object({
title: z.string(),
prefix: z.string(),
code: z.number(),
credits: z.number(),
preRequisiteCourses: z.array(PreRequisiteCourseValidationSchema).optional(),
isDeleted: z.boolean().optional(),
}),
});
const updatePreRequisiteCourseValidationSchema = z.object({
course: z.string(),
isDeleted: z.boolean().optional(),
});
const updateCourseValidationSchema = z.object({
body: z.object({
title: z.string().optional(),
prefix: z.string().optional(),
code: z.number().optional(),
credits: z.number().optional(),
preRequisiteCourses: z
.array(updatePreRequisiteCourseValidationSchema)
.optional(),
isDeleted: z.boolean().optional(),
}),
});
export const CourseValidations = {
createCourseValidationSchema,
updateCourseValidationSchema
};
```
- Handling Validation for Updates
The issue we should focus on is that for createCourseValidationSchema, all fields but one are required. If we use it for updating by using partial (because not all fields require an update), it will not work. The required fields will not become optional by using the partial method. So, I created a new validation schema for the update and made all fields optional. This way, from the front end, users can update any field.
### Service Layer
I will skip the content of the route and controller files and directly move to the service file
```javascript
import httpStatus from 'http-status';
import mongoose from 'mongoose';
import AppError from '../../errors/AppError';
import { TCourse } from './course.interface';
import { Course } from './course.model';
const updateCourseIntoDB = async (id: string, payload: Partial<TCourse>) => {
const { preRequisiteCourses, ...courseRemainingData } = payload; // Separate primitive and non-primitive data
const session = await mongoose.startSession(); // Initiate session for transaction
try {
session.startTransaction(); // Start transaction
// Step 1: Update primitive course info
const updatedBasicCourseInfo = await Course.findByIdAndUpdate(
id,
courseRemainingData, // Pass primitive data
{
new: true,
runValidators: true, // Run validators
session, // Pass session
},
);
// Throw error if update fails
if (!updatedBasicCourseInfo) {
throw new AppError(httpStatus.BAD_REQUEST, 'Failed to update course');
}
// Check if there are any prerequisite courses to update
if (preRequisiteCourses && preRequisiteCourses.length > 0) {
// Filter out the deleted fields
const deletedPreRequisites = preRequisiteCourses
.filter((el) => el.course && el.isDeleted) // Fields with isDeleted property value true
.map((el) => el.course); // Only take id for deletion
const deletedPreRequisiteCourses = await Course.findByIdAndUpdate(
id,
{
$pull: { // Use $pull operator to remove objects with matching ids in deletedPreRequisites
preRequisiteCourses: { course: { $in: deletedPreRequisites } },
},
},
{
new: true,
runValidators: true, // Run validators
session, // Pass session
},
);
// Throw error if deletion fails
if (!deletedPreRequisiteCourses) {
throw new AppError(httpStatus.BAD_REQUEST, 'Failed to update course');
}
// Filter out courses that need to be added (isDeleted property value is false)
const newPreRequisites = preRequisiteCourses?.filter(
(el) => el.course && !el.isDeleted,
);
// Perform write operation to update newly added fields
const newPreRequisiteCourses = await Course.findByIdAndUpdate(
id,
{
$addToSet: { preRequisiteCourses: { $each: newPreRequisites } },
}, // Use $addToSet operator to avoid duplication
{
new: true,
runValidators: true,
session,
},
);
if (!newPreRequisiteCourses) {
throw new AppError(httpStatus.BAD_REQUEST, 'Failed to update course');
}
}
// Commit and end session for successful operation
await session.commitTransaction();
await session.endSession();
// Perform find operation to return the data
const result = await Course.findById(id).populate(
'preRequisiteCourses.course',
);
return result;
} catch (err) {
console.log(err);
await session.abortTransaction(); // Abort transaction on error
await session.endSession(); // End session
throw new AppError(httpStatus.BAD_REQUEST, 'Failed to update course'); // Throw error
}
};
export const CourseServices = {
updateCourseIntoDB
};
```
### Conclusion
In this blog, we have walked through the process of updating primitive and non-primitive data in a MongoDB document using Mongoose. By utilizing transactions and rollbacks, we ensure the integrity of our data during complex update operations. This approach allows for robust handling of both primitive and non-primitive updates, making our application more resilient and reliable
| md_enayeturrahman_2560e3 |
1,890,072 | Understanding Inheritance and Polymorphism: Simplified OOP Concepts | Inheritance Inheritance means creating a new class based on an existing class. The new... | 0 | 2024-06-16T06:51:15 | https://dev.to/jaid28/understanding-inheritance-and-polymorphism-simplified-oop-concepts-269c | inheritance, oop, polymorphism, teaching | ## Inheritance
Inheritance means creating a new class based on an existing class. The new class inherits attributes and methods from the existing class.
## Example Explanation
Imagine you have a general class called Animal. You can create a specific class called Dog that inherits everything from Animal and adds its own features.
**code**
//continue the example
**Explanation of the Example**
- Animal class (Parent class):
1. Has an attribute 'name'.
2. Has a method 'eat'.
- Dog class (Child class):
1. Inherits everything from 'Animal'.
2. Adds its own method 'bark()'.
- my_dog Object:
1. Can use the 'eat()' method from 'Animal'.
2. Can use the 'bark()' method from 'Dog'.
## Polymorphism
Polymorphism means "many shapes". It allows methods to do different things based on the object it is acting upon, even if they share the same name.
## Example Explanation
Let's continue with the 'Animal' and 'Dog' classes, and add another class called 'Cat'.
**Code**
// continue the example
## Explanation of the Example
- Animal Class:
1. Has a method 'make_sound()' that prints a generic message.
- Dog Class:
1. Inherits from 'Animal'.
2. Overrides 'make_sound()' to print a dog-specific message.
- Cat Class:
1. Inherits from 'Animal'.
2. Overrides 'make_sound()' to print a cat-specific message.
- my_dog and my_cat Objects:
1. Both use the make_sound() method, but each prints a
different message based on their class.
## **Summary**
1. **Inheritance**: Allows a class to inherit attributes and
methods from another class.
2. **Polymorphism**: Allows methods to do different things based
on the object they are called on, even if they share the same
name.
In next article we will Explore Abstraction & Encapsulation and please give me your feedback
| jaid28 |
1,890,071 | Best Practices for Creating Reusable Custom Hooks in React | Custom hooks in React provide a powerful way to encapsulate and reuse logic across your application.... | 0 | 2024-06-16T06:48:37 | https://dev.to/hasancse/best-practices-for-creating-reusable-custom-hooks-in-react-37nj | webdev, programming, react, typescript | Custom hooks in React provide a powerful way to encapsulate and reuse logic across your application. They promote code reuse, enhance readability, and simplify state management. In this blog post, we'll explore best practices for creating reusable custom hooks in React using TypeScript, ensuring type safety and robustness.
**Table of Contents**
1. Introduction
2. Benefits of Custom Hooks
3. Naming Conventions
4. Keeping Hooks Simple
5. Handling Side Effects
6. Using Generics for Flexibility
7. Providing Defaults and Options
8. Testing Custom Hooks
9. Documenting Your Hooks
10. Conclusion
## 1. Introduction
Custom hooks are a key feature of React that allow developers to extract component logic into reusable functions. TypeScript further enhances custom hooks by providing type safety and preventing common errors. Let's delve into the best practices for creating reusable custom hooks in React with TypeScript.
## 2. Benefits of Custom Hooks
Before diving into best practices, let's review the benefits of using custom hooks:
- Code Reusability: Custom hooks allow you to reuse logic across multiple components.
- Readability: They help in breaking down complex logic into smaller, manageable functions.
- Separation of Concerns: Custom hooks help in separating state management and side effects from the UI logic.
## 3. Naming Conventions
Naming your hooks properly is crucial for maintainability and readability. Always prefix your custom hook names with use to indicate that they follow the rules of hooks.
```
// Good
function useCounter() {
// hook logic
}
// Bad
function counterHook() {
// hook logic
}
```
## 4. Keeping Hooks Simple
A custom hook should do one thing and do it well. If your hook becomes too complex, consider breaking it down into smaller hooks.
```
// Good
function useCounter(initialValue: number = 0) {
const [count, setCount] = useState<number>(initialValue);
const increment = () => setCount(count + 1);
const decrement = () => setCount(count - 1);
const reset = () => setCount(initialValue);
return { count, increment, decrement, reset };
}
// Bad
function useComplexCounter(initialValue: number = 0, step: number = 1) {
const [count, setCount] = useState<number>(initialValue);
const increment = () => setCount(count + step);
const decrement = () => setCount(count - step);
const reset = () => setCount(initialValue);
const double = () => setCount(count * 2);
const halve = () => setCount(count / 2);
return { count, increment, decrement, reset, double, halve };
}
```
## 5. Handling Side Effects
When dealing with side effects, use the useEffect hook inside your custom hook. Ensure that side effects are properly cleaned up to prevent memory leaks.
```
import { useEffect, useState } from 'react';
function useFetchData<T>(url: string) {
const [data, setData] = useState<T | null>(null);
const [loading, setLoading] = useState<boolean>(true);
useEffect(() => {
const fetchData = async () => {
try {
const response = await fetch(url);
const result = await response.json();
setData(result);
} catch (error) {
console.error('Error fetching data:', error);
} finally {
setLoading(false);
}
};
fetchData();
}, [url]);
return { data, loading };
}
export default useFetchData;
```
## 6. Using Generics for Flexibility
Generics in TypeScript allow your hooks to be more flexible and reusable by supporting multiple types.
```
import { useState, useEffect } from 'react';
function useFetchData<T>(url: string): { data: T | null, loading: boolean } {
const [data, setData] = useState<T | null>(null);
const [loading, setLoading] = useState<boolean>(true);
useEffect(() => {
const fetchData = async () => {
const response = await fetch(url);
const result = await response.json();
setData(result);
setLoading(false);
};
fetchData();
}, [url]);
return { data, loading };
}
export default useFetchData;
```
## 7. Providing Defaults and Options
Providing sensible defaults and allowing options makes your hooks more versatile.
```
interface UseToggleOptions {
initialValue?: boolean;
}
function useToggle(options?: UseToggleOptions) {
const { initialValue = false } = options || {};
const [value, setValue] = useState<boolean>(initialValue);
const toggle = () => setValue(!value);
return [value, toggle] as const;
}
export default useToggle;
```
## 8. Testing Custom Hooks
Testing is crucial to ensure your custom hooks work correctly. Use React Testing Library and Jest to write tests for your hooks.
```
import { renderHook, act } from '@testing-library/react-hooks';
import useCounter from './useCounter';
test('should use counter', () => {
const { result } = renderHook(() => useCounter());
expect(result.current.count).toBe(0);
act(() => {
result.current.increment();
});
expect(result.current.count).toBe(1);
act(() => {
result.current.decrement();
});
expect(result.current.count).toBe(0);
act(() => {
result.current.reset();
});
expect(result.current.count).toBe(0);
});
```
## 9. Documenting Your Hooks
Clear documentation helps other developers understand and use your hooks effectively. Include comments and usage examples.
```
/**
* useCounter - A custom hook to manage a counter.
*
* @param {number} [initialValue=0] - The initial value of the counter.
* @returns {object} An object containing the count value and functions to increment, decrement, and reset the count.
*
* @example
* const { count, increment, decrement, reset } = useCounter(10);
*/
function useCounter(initialValue: number = 0) {
const [count, setCount] = useState<number>(initialValue);
const increment = () => setCount(count + 1);
const decrement = () => setCount(count - 1);
const reset = () => setCount(initialValue);
return { count, increment, decrement, reset };
}
export default useCounter;
```
## 10. Conclusion
Creating reusable custom hooks in React with TypeScript enhances code reusability, maintainability, and robustness. By following these best practices, you can ensure that your custom hooks are efficient, flexible, and easy to use.
| hasancse |
1,890,070 | The Importance of Prayer in Islam | Prayer, known as Salah in Arabic, is one of the Five Pillars of Islam and a fundamental aspect of a... | 0 | 2024-06-16T06:39:52 | https://dev.to/b0cddb2d154184/the-importance-of-prayer-in-islam-55np | Prayer, known as Salah in Arabic, is one of the Five Pillars of Islam and a fundamental aspect of a Muslim’s faith and practice. It is a direct link between the worshiper and Allah, providing an opportunity to communicate, reflect, and seek guidance. This article explores the significance of prayer in Islam, its spiritual, mental, and physical benefits, and the role it plays in a Muslim’s daily life.
**The Five Daily Prayers**
In Islam, prayer is performed five times a day at specific times. These prayers are Fajr, Dhuhr, Asr, Maghrib, and Isha. Each prayer has its own unique significance and time.
**Fajr (Dawn Prayer)**
Fajr is performed before dawn and signifies the start of the day. It is a reminder to begin the day with a spiritual focus and gratitude. For accurate Fajr prayer times in Manchester, visit **[Manchester Prayer Times](https://manchesterprayertimes.com/
)**.
**Dhuhr (Midday Prayer)**
Dhuhr is observed after the sun passes its zenith. This prayer serves as a break in the day to realign one’s thoughts and actions with the will of Allah.
**Asr (Afternoon Prayer)**
Asr is performed in the late afternoon. It reminds Muslims of the temporal nature of life and the importance of preparing for the Hereafter.
**Maghrib (Sunset Prayer)**
Maghrib is observed just after sunset. It signifies the end of the day and the completion of daily tasks.
**Isha (Night Prayer)**
Isha is performed at night. It marks the end of the daily cycle, encouraging reflection on the day’s deeds and seeking forgiveness.
**Spiritual Benefits of Praying on Time**
Praying on time has profound spiritual benefits for Muslims.
**Connection with Allah**
Regular prayer strengthens the bond between a Muslim and Allah. It is an opportunity to seek guidance, express gratitude, and ask for forgiveness.
**Spiritual Discipline**
Adhering to the prayer schedule instills a sense of discipline and obedience to Allah’s commandments. It helps Muslims maintain a structured and spiritually centered life.
**Inner Peace**
Consistent prayer fosters a sense of inner peace and tranquility. It provides a moment of respite from the stresses of daily life, allowing Muslims to refocus and rejuvenate their spirit.
**Purification of the Soul**
Prayer acts as a purification process for the soul, cleansing it of sins and negative influences. It encourages continuous self-improvement and piety.
**Mental and Physical Benefits**
Beyond spiritual benefits, prayer also has significant mental and physical advantages.
**Mental Clarity and Focus**
Prayer requires concentration and mindfulness, which can enhance mental clarity and focus. It serves as a mental reset, reducing stress and anxiety.
**Stress Relief**
The repetitive physical actions and recitation of verses during prayer have a calming effect on the mind. This can help in managing stress and promoting emotional stability.
**Physical Health**
The physical movements in prayer, such as standing, bowing, and prostrating, promote flexibility and muscle strength. These movements can also improve circulation and overall physical well-being.
**Discipline and Routine**
Praying at fixed times encourages a disciplined lifestyle. This routine can improve time management skills and foster a balanced daily schedule.
**The Role of Prayer in a Muslim’s Daily Life**
Prayer is not just a ritualistic practice but a way of life for Muslims. It influences their actions, decisions, and interactions throughout the day.
**Ethical Conduct**
Prayer instills a sense of accountability and responsibility. Muslims are reminded to act ethically and justly, as they are answerable to Allah.
**Community and Solidarity**
Congregational prayers, especially the Friday prayer (Jumu’ah), strengthen community bonds. They provide an opportunity for social interaction and collective worship.
**Continuous Remembrance of Allah**
By praying regularly, Muslims maintain a constant awareness of Allah in their lives. This continuous remembrance (Dhikr) helps them stay focused on their spiritual goals.
**Seeking Guidance**
Prayer is a means to seek divine guidance in personal and communal matters. It offers a way to seek clarity and wisdom in making decisions.
**Conclusion**
Prayer in Islam is a multifaceted practice that encompasses spiritual, mental, and physical benefits. It is a cornerstone of a Muslim’s faith, providing a structured way to maintain a connection with Allah, achieve inner peace, and lead a disciplined life. The five daily prayers serve as regular reminders of the temporal nature of life and the importance of spiritual growth and ethical conduct. By adhering to the practice of prayer, Muslims can navigate their daily lives with purpose, clarity, and a deep sense of spiritual fulfillment.
By understanding and appreciating the importance of prayer in Islam, we can better comprehend its role in the lives of millions of Muslims worldwide. Whether you are a practicing Muslim or someone interested in learning about Islamic practices, recognizing the value of prayer can foster greater respect and insight into this vital aspect of the Muslim faith. | b0cddb2d154184 | |
1,890,069 | Amazon RDS Multi-AZ Deployments vs Read Replica | Amazon RDS (Relational Database Service) provides several features to enhance the availability,... | 0 | 2024-06-16T06:39:18 | https://dev.to/sachithmayantha/amazon-rds-multi-az-deployments-vs-read-replica-1ki3 | aws, rds | ---
title: Amazon RDS Multi-AZ Deployments vs Read Replica
published: true
description:
tags: aws, rds
cover_image: https://www.whizlabs.com/blog/wp-content/uploads/2020/01/Amazon_RDS.png
# Use a ratio of 100:42 for best results.
# published_at: 2024-06-16 05:19 +0000
---
Amazon RDS (Relational Database Service) provides several features to enhance the availability, scalability, and reliability of your databases. Two of these features are Read Replicas and Multi-AZ (Availability Zone) deployments. Here is the explanation of how each of these works internally and their respective use cases:
Read Replica in Amazon RDS
Read Replica is a feature that allows you to create read-only copies of your database instance. This helps distribute read traffic and offload queries from the primary database, improving performance and scalability.
How Read Replicas Work Internally:
1. Primary Instance: The original database instance where data changes are made.
2. Asynchronous Replication: Changes made to the primary database are asynchronously replicated to the read replica. This means that the replication process does not wait for the changes to be applied to the replica before completing the transaction on the primary instance.
3. Replication Mechanism:
- MySQL, MariaDB, PostgreSQL: Use native asynchronous replication features.
- Oracle: Uses Data Guard for replication.
- SQL Server: Uses SQL Server transactional replication.
4. Read-Only: The read replica databases are set up to handle read-only operations. That means, write operations are not allowed.
5. Lag: Because replication is asynchronous, there can be a lag between the primary instance and the read replica. This lag is the time it takes for the data to be copied from the primary to the replica.
6. Multiple Read Replicas: You can create multiple read replicas for a single primary instance to further distribute the read load.
7. Promotion to Primary: If needed, a read replica can be promoted to become a standalone primary instance, converting it into a read-write instance.
Benefits of Read Replicas:
- Scaling Read Operations: Offload read-heavy operations from the primary instance to one or more read replicas. This is useful for applications with high read-to-write ratios.
- Geographical Distribution: Place read replicas in different regions to reduce latency for users globally.
- Data Analytics: Use read replicas to run analytical queries without impacting the performance of the primary database.
Multi-AZ Deployments in Amazon RDS
Multi-AZ Deployment is designed to enhance the availability and reliability of the database by automatically replicating data across multiple Availability Zones (AZs).
How Multi-AZ Works Internally:
1. Primary Instance: The main database instance where read/write operations occur.
2. Standby Instance: A synchronized standby instance is created in a different AZ within the same region.
3. Synchronous Replication: Unlike read replicas, Multi-AZ uses synchronous replication. This means changes are immediately and automatically replicated from the primary instance to the standby instance.
4. Automatic Failover: In the event of an infrastructure failure (e.g., hardware failure, network outage) or maintenance, Amazon RDS automatically fails over to the standby instance. The database endpoint remains the same, so the application can reconnect without requiring changes.
5. Continuous Monitoring: RDS monitors the health of the primary and standby instances and manages failover automatically.
6. Recovery from Failover: The standby instance is promoted to primary, and a new standby is created in another AZ if necessary.
Benefits of Multi-AZ:
- High Availability: Critical applications that require high availability and resilience against AZ failures.
- Disaster Recovery: Applications that need automatic failover capabilities to minimize downtime and maintain business continuity during outages. | sachithmayantha |
1,890,068 | Duo Studio UI clone 🚀 | 🚀 Check Out My Latest Project! 🚀 I’m excited to announce my latest frontend development achievement:... | 0 | 2024-06-16T06:38:38 | https://dev.to/sameer07x19/duo-studio-ui-clone-1ldk | webdev, beginners, gsap, javascript | 🚀 **Check Out My Latest Project!** 🚀
I’m excited to announce my latest frontend development achievement: a stunning UI clone of the Duo Studio website! This project is a testament to my skills in creating immersive web experiences with cutting-edge animations.
### 🔹 Project Highlights 🔹
**Dynamic Animations:** Crafted with GSAP and ScrollTrigger, bringing the interface to life with smooth transitions and engaging interactions.
**Modern UI Elements:** Utilizing advanced CSS techniques for a sleek, professional look that stands out.
**Clean, Maintainable Code:** Well-structured and thoroughly commented for easy understanding and future improvements.
### 🔹 Technologies Used 🔹
- HTML5
- CSS3
- JavaScript
- GSAP (GreenSock Animation Platform)
- ScrollTrigger
Dive into the project on GitHub and let me know your thoughts! Your feedback and suggestions are always welcome.
🔗 https://sameer07x19.github.io/Duo-Studio/
🔗 https://duo-studio-web.netlify.app/
| sameer07x19 |
1,890,067 | Problem : - Your project requires a newer version of the Kotlin Gradle plugin in Flutter. | Your project requires a newer version of the Kotlin Gradle plugin. Find the latest version on... | 0 | 2024-06-16T06:29:40 | https://dev.to/ozonexkeshav07/problem-your-project-requires-a-newer-version-of-the-kotlin-gradle-plugin-in-flutter-5da3 | kotlin, dart, flutter, development | Your project requires a newer version of the Kotlin Gradle plugin. Find the latest version on https://kotlinlang.org/docs/gradle.html#plugin-and-versions, then update project/android/build.gradle: ext.kotlin_version = '<latest-version>'
But You have already changed the "ext.kotlin_version = '<latest-version>'"
and still facing the issue, Here you can follow the steps to solve this problem,
**Note :-Editing the Kotlin version in only gradle.build not helps in most cases and you have to edit also in your setting.gradle file and edit your Kotlin version according to your Gradle version**
Step-1
Find the version of your gradle , in your Flutter project
Step-2
Visit this link https://kotlinlang.org/docs/gradle-configure-project.html#apply-the-plugin
and find suitable Kotlin version according to your Gradle version.
Step-3
go to project folder/android/gradle.build
and write this and if this is already written just edit it according to your gradle version
```
ext.kotlin_version = 'x.y.z'
```
in your build.gradle file
Now go to setting.gradle file and write the Kotlin version as same as you have written in build.gradle file
Thank you for reading this will for works for you | ozonexkeshav07 |
1,883,762 | Mastering PHP File Paths: Simplifying Your Project's Structure | Have you ever tried including a file in your project and needed clarification about how to go about... | 0 | 2024-06-16T06:28:10 | https://dev.to/anwar_sadat/mastering-php-file-paths-simplifying-your-projects-structure-650 | php, backenddevelopment, tutorial, beginners | Have you ever tried including a file in your project and needed clarification about how to go about it? You usually start with a simple folder structure that can quickly escalate to a complex folder structure. This article will discuss the absolute and relative paths, directory separators, file functions, including files in PHP, and how to use file paths in PHP.
All paths will be in Windows OS format. An example will be like this;
```
$file = 'C:/xampp/htdocs/project/includes/config.php';
```
In this article, we take a more practical approach to explain the file paths in PHP. Let’s assume that we have a project structure as below.
```
tutorials/
|-- database/
|-- |-- connection.php
|-- report/
|-- |-- admin/approvals.php
|-- |-- tracker.php
|-- signin.php
```
## Absolute vs. Relative File Paths
To add a file to your project, you need to know the location or path of the file. Knowing the file location, you can decide to add the file in two ways; absolute or relative file path.
### Absolute Path
An absolute file path specifies the complete and precise location of a file or directory in the filesystem. It starts from the root directory and includes directories up to the target file or directory. It does depend on the current working directory (CWD) and it points to the same directory regardless of the script is run.
Using the absolute path, we can include the `connection.php` file in the project1 directory like this;
```
// tutorials/signin.php
$path = "c:/xampp/htdocs/tutorials/database/connection.php"; // absolute path to database/connection.php
// tutorials/report/tracker.php
$path = "c:/xampp/htdocs/tutorials/database/connection.php"; // absolute path to database/connection.php
// tutorials/report/admin/approvals.php
$path = "c:/xampp/htdocs/tutorials/database/connection.php"; // absolute path to database/connection.php
```
This path assumes that the parent directory, ‘tutorials’, is at c:\xampp\htdocs.
###Relative Path
The relative path does not start from the root directory. It depends on or relative to the current working directory or any other directory.
When the file is inside the current working directory, use one dot sign ‘.’, and two dots ‘..’ when the file is relative to the parent directory or other directories relative to the file.
Let’s get the ‘tutorials/database/connection.php’ file path relative to the other directories;
```
// tutorials/signin.php
$path = "./database/connection.php"; // (./) relative to the current tutorials directory
// tutorials/report/tracker.php
$path = "../database/connection.php"; // (../) moves one level up to the tutorials directory
// tutorials/report/admin/approvals.php
$path = "../../database/connection.php"; // (../../) moves two levels up to the tutorials directory
```
##Directory Separators in PHP
When you look closely at our paths, you realize we use forward slashes, (‘/’). The forward (‘/’) and the backslash (‘\’) slashes, called directory separators are used to separate directories in a file system.
The forward slash simplifies path handling and enhances cross-platform compatibility on Unix-like systems and is supported on Windows.
The backslash is used mostly on Windows systems. The double backslash functions as an escape character string.
##PHP File Path Functions
PHP has many built-in functions that can be used to manipulate file paths. These functions help in constructing, analyzing, and managing paths in a platform-independent manner. Some key functions include;
-
**basename()**: This returns the filename component of a path. It takes two parameters, a path that specifies the path of the file, and a suffix that is used to specify the suffix to remove from the end of the returned file.
```
$filename = basename($path); // connection.php
$filenameWithoutExtension = basename($path, '.php'); // connection
```
-
dirname(): This returns the directory name component of a path. It takes the $path parameter and optional $levels which specifies the directory levels.
```
$path = "htdocs/tutorials/database/connection.php";
$directory = dirname($path); // htdocs/tutorials/database
$directorySecondLevel = dirname($path, 2); // htdocs/tutorials
```
-
realpath(): It is used to convert relative path to absolute path.
```
$relativePath = "../database/connection.php";
$absolutePath = realpath($path); // C:\xampp\htdocs\tutorials\database\connection.php
```
-
glob(): This method finds pathnames matching a pattern. It returns an array of PHP files in the specified directory.
```
$path = "tutorials/report/*.php";
$files = glob($path); // $files will contain an array of PHP files in the specified directory
```
-
file_exists(): This method checks whether a file or directory exists. It returns a boolean value.
```
$path = "../database/connection.php";
$files = file_exists($path); // $files will contain an array of PHP files in the specified directory
```
##Including Files in PHP
For code organization, reusability, and maintaining modularity in PHP applications, you can use the include() and require() functions to add and evaluate files while executing a script.
The include() function will generate a warning if the file cannot be found, but the script will continue to execute.
The require() function will generate a fatal error if the file cannot be found, and the script will stop running.
To use these functions, you need to specify the file path correctly. You can either use absolute paths or relative paths depending on your needs. The file must be in the correct location and must have the correct name (case-sensitive).
##Conclusion
As a software developer using PHP, it is very important to understand file paths. You must also know when to include files using either the include() or require() functions to help with code organization, reusability, and modularity.
Use absolute paths when possible but can be inflexible if the scripts need to be moved to a different server or directory.
Use the dirname() function to get the directory of the current file which can help to build relative paths. Relative paths can be ambiguous if the script is used in different contexts.
Check the existence of a file using file_exists() functions before including it because an incorrect path can lead to errors and security vulnerabilities.
Thank you for reading. See you on the next one.
| anwar_sadat |
1,890,035 | Implement a DevSecOps Pipeline with GitHub Actions | Introduction - Birth of DevSecOps The story of DevSecOps follows the the story of Software... | 0 | 2024-06-16T06:24:22 | https://dev.to/herjean7/implement-a-devsecops-pipeline-with-github-actions-2lbb | devsecops, githubactions, node, cicd | ## Introduction - Birth of DevSecOps
The story of DevSecOps follows the the story of Software Development closely. We saw how the industry moved from Waterfall to Agile and everything changed after Agile. With much shorter development cycles, there was also a need for faster deployments to production.
It was no longer feasible for Security teams to get the Dev / Ops teams to wait till Vulnerability Assessment and Penetration Testing (VAPT) was complete before changes could be pushed to production. If not, we nullify the advantage the team had with speed and agility.
> DevOps is a set of practices intended to reduce the time between committing a change to a system and the change being placed into production, while ensuring high quality - Bass, Weber and Zhu
By definition, DevOps already includes Security as part of Operations but the Security industry wanted more focus and emphasis on Security hence the term DevSecOps or Secure DevOps came about.
## Security Terms
Before diving into the implementation phase, let's familiarise ourselves with these 3 security terms.
**SCA** - stands for Software Composition Analysis. It is a technique used to find security vulnerabilities in third-party components that we use in our projects / products. They can be libraries, packages that we install.
We will be using **Snyk** (pronounced as "Sneak") for our SCA tool. Snyk is a developer-first SCA solution, helping developers find, prioritize and fix security vulnerabilities and license issues in open source dependencies
1. Create a free SNYK account at [SNYK](https://snyk.io/ )
2. Navigate to Account Settings
3. Generate Auth Token
4. This key would be your **SNYK_TOKEN**. Store it within your GitHub Actions Secrets.
**SAST** - stands for Static Application Security Testing. It is a technique used to analyse source codes, binary and byte codes for security vulnerabilities without running the code. Since the codes are not running but examined in static state, it is called static analysis. SAST, SCA and Linting are typical examples of static analysis
For SAST, we will be using **Sonar**. SonarCloud is a cloud based static analysis tool for your CI/CD pipeline. It supports dozens of popular languages, development frameworks and IaC platforms.
1. Create a free Sonar account at [SonarCloud](https://www.sonarsource.com/products/sonarcloud/ )
2. Create a new **Organisation** and **Project**
3. Navigate to My Account, Security Tab
4. Generate a new Token
5. This token would be your **SONAR_TOKEN**. Store it within your GitHub Actions Secrets.
**DAST** - stands for Dynamic Application Security Testing. This is a technique used to analyse the running application for security vulnerabilities. Since the application is running and being examined dynamically, it is called dynamic analysis.
For DAST, we will be using **OWASP ZAP**. ZAP is the world’s most widely used web app scanner. It is a free, open-source penetration testing tool and at its core, ZAP is known as a “man-in-the-middle proxy”. You would find 3 Github actions belonging to OWASP ZAP within the GitHub Marketplace.
## GitHub Actions
GitHub Actions is a CI/CD platform that allows us to automate our build, test and deployment pipeline
You can find it within your code repository on GitHub. It is the Actions Tab.
And when you click onto any of these workflow runs, you would be able to see the jobs that ran under that workflow
Above is a sample workflow.
**Workflows** are automated processes that you can configure to run one or more jobs. Workflows are defined by YAML files checked into your repository. These yaml files are stored in the `.github/workflows` directory. You can have multiple workflows, each of them doing a different set of tasks
The workflow can be triggered by an event (e.g. a pull request / when a developer pushes a change into the code repository)
When that happens, one or more jobs will start running.
**Jobs** are steps are executed in order and are dependent on each other. You can share data from one step to another as they are ran on the same runner.
**Runners** are servers that run your workflows when triggered and Github provides Linux, Windows and MacOS virtual machines for you to run your workflows.
## Our Workflow
Our DevSecOps pipeline will consist of 3 jobs.
**Build** - requests for the latest ubuntu server, installs the latest github actions (v4), installs nodeJS version 20, installs our project's dependencies `npm run install`, runs our unit test `npm run test` and performs SAST using Sonar.
**SCA** - requests for the latest ubuntu server and for this job to start running, it _needs_ the build job to be complete. It will install the latest github actions (v4) and runs Snyk against our code repository.
**DAST** - requests for latest ubuntu server, waits for SCA job to be complete, checks out the latest github actiosn (v4) and runs OWASP ZAP against a sample website (example.com).
The entire CICD pipeline can be implemented in just 50 lines of codes below.
```
name: Build code, run unit test, run SAST, SCA, DAST security scans for NodeJs App
on: push
jobs:
Build:
runs-on: ubuntu-latest
name: Unit Test and SAST
steps:
- uses: actions/checkout@v4
- uses: actions/setup-node@v4
with:
node-version: '20.x'
cache: npm
- name: Install dependencies
run: npm install
- name: Test and coverage
run: npm run test
- name: SonarCloud Scan
uses: sonarsource/sonarcloud-github-action@master
env:
GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}
with:
args: >
-Dsonar.organization=[YOUR_SONAR_ORGANISATION]
-Dsonar.projectKey=[YOUR_SONAR_PROJECT]
SCA:
runs-on: ubuntu-latest
needs: Build
name: SCA - SNYK
steps:
- uses: actions/checkout@v4
- name: Run Snyk to check for vulnerabilities
uses: snyk/actions/node@master
continue-on-error: true
env:
SNYK_TOKEN: ${{ secrets.SNYK_TOKEN }}
DAST:
runs-on: ubuntu-latest
needs: SCA
name: DAST - ZAP
steps:
- name: Checkout
uses: actions/checkout@v4
with:
ref: main
- name: ZAP Scan
uses: zaproxy/action-baseline@v0.11.0
with:
target: 'http://example.com/'
```
## Troubleshooting
You would notice that your unit test coverage report isn't being uploaded into SonarCloud. To fix this, create a sonar-project.properties file in the root of your repository. The file will inform Sonar where to retrieve your code coverage reports.
```
sonar.organization=[INPUT_YOUR_ORGANISATION]
sonar.projectKey=[INPUT_YOUR_PROJECT_KEY]
# relative paths to source directories. More details and properties are described
# in https://sonarcloud.io/documentation/project-administration/narrowing-the-focus/
sonar.sources=.
sonar.exclusions=**/tests/*.js
sonar.language=js
sonar.javascript.lcov.reportPaths=./coverage/lcov.info
sonar.testExecutionReportPaths=./test-report.xml
sonar.sourceEncoding=UTF-8
```
##Resources
For a working example, you can refer to my [repository](https://github.com/herjean7/DevSecOpsTest)
Cheers!
| herjean7 |
1,890,048 | Home Construction Company in Bangalore | Assurance Developers | Assurance Developers is a leading Home construction company in Bangalore, known for its unwavering... | 0 | 2024-06-16T06:12:25 | https://dev.to/assurancedevelopers_f6070/home-construction-company-in-bangalore-assurance-developers-19l0 | homeconstructioncompany, constructioncompany, assurancedevelopers | Assurance Developers is a leading [Home construction company in Bangalore](https://assurancedevelopers.com/residential-buildings/
), known for its unwavering commitment to excellence and reliability. With a dedicated team of skilled professionals and a passion for creating exceptional living spaces, Assurance Developers delivers top-notch construction services that exceed client expectations. Their attention to detail, use of high-quality materials, and adherence to timelines make them a trusted name in the industry.
| assurancedevelopers_f6070 |
1,890,047 | Finding the Largest Sum Subarray: Step-by-Step Guide Using Kadane's Algorithm | Finding the largest sum subarray is a intermediate problem in coding interviews. In this guide, we'll... | 0 | 2024-06-16T06:12:08 | https://dev.to/rk042/finding-the-largest-sum-subarray-step-by-step-guide-using-kadanes-algorithm-1nc1 | programming, career, algorithms, interview | Finding the largest sum subarray is a intermediate problem in coding interviews. In this guide, we'll explore how to locate the maximum sum of a continuous subarray using Kadane's Algorithm. Don't worry if this sounds complex at first—we'll break it down step by step.
Go ahead and check them out!
[Find the largest sum subarray using Kadanes Algorithm](https://interviewspreparation.com/finding-the-largest-sum-subarray-using-kadanes-algorithm/)
[Mastering Object-Oriented Programming in C++](https://interviewspreparation.com/understanding-object-oriented-programming-oop-in-cpp/)
[Palindrome Partitioning A Comprehensive Guide](https://interviewspreparation.com/palindrome-partitioning-a-comprehensive-guide/)
[what is parameter in coding and what is the deference between param and argument in programming] (https://interviewspreparation.com/what-is-a-parameter-in-programming/)
[how to inverse a matrix in c#](https://interviewspreparation.com/how-to-inverse-a-matrix-in-csharp/)
[find the first occurrence of a string](https://interviewspreparation.com/find-the-first-occurrence-of-a-string/)
[Longest common substring without repeating characters solution](https://interviewspreparation.com/longest-common-substring-without-repeating-characters/),
[Function Overloading in C++](https://interviewspreparation.com/function-overloading-in-cpp/),
[Two Sum LeetCode solution in C#](https://interviewspreparation.com/two-sum-leetcode-solution/)
[Method Overloading vs. Method Overriding in C#](https://interviewspreparation.com/method-overloading-vs-method-overriding-in-csharp-interviews/)
## Why Kadane's Algorithm ?
As a programmer, you might wonder why Kadane's Algorithm is so popular. Well, let me share a story. While searching for a better approach to solve the continuous subarray problem, I came across Kadane's Algorithm.
This technique uses dynamic programming to efficiently find the maximum sum of a continuous subarray. It operates in linear time, making it ideal for handling large datasets. The main idea is to go through the array, keeping track of both the maximum sum encountered so far and the current subarray sum. Let’s delve into how it works!
## How Kadane's Algorithm Works ?
Initialize Variables: Start with two variables, max_so_far and max_ending_here, both set to the first element of the array. The max_so_far keeps the record of the maximum sum found, and max_ending_here keeps the sum of the current subarray.
Iterate through the Array: For each element in the array, update max_ending_here to be the maximum of the current element itself or the current element plus max_ending_here. Update max_so_far to be the maximum of max_so_far and max_ending_here.
Return the Result: After processing all elements, max_so_far will contain the largest sum of a subarray.
Please follow Detailed page [How Kadane's Algorithm Works ?](https://interviewspreparation.com/finding-the-largest-sum-subarray-using-kadanes-algorithm/#how-kadanes-algorithm-works)
## Implement Kadane’s Algorithm in Python
```
def find_largest_sum_subarray(arr):
max_so_far = arr[0]
max_ending_here = arr[0]
for num in arr[1:]:
max_ending_here = max(num, max_ending_here + num)
max_so_far = max(max_so_far, max_ending_here)
return max_so_far
# Example usage
array = [-2, 1, -3, 4, -1, 2, 1, -5, 4]
print("The largest sum of a subarray is:", find_largest_sum_subarray(array))
```
Using [Kadane's Algorithm](https://interviewspreparation.com/finding-the-largest-sum-subarray-using-kadanes-algorithm/) is a straightforward and efficient way to find the largest sum of a continuous subarray. By maintaining a running tally of the current subarray sum and updating the maximum sum encountered, the algorithm ensures an optimal solution in linear time. This approach is widely applicable in various fields, including finance, data analysis, and more, where locating maximum sum subarrays is essential. | rk042 |
1,890,046 | Containerization Conquest: How Netflix Leverages Docker for Speedy Deployments | Imagine deploying a new feature for a massive online service. Traditionally, this involved a complex... | 0 | 2024-06-16T06:08:53 | https://dev.to/marufhossain/containerization-conquest-how-netflix-leverages-docker-for-speedy-deployments-gch | Imagine deploying a new feature for a massive online service. Traditionally, this involved a complex dance of manual steps, compatibility checks, and a healthy dose of crossed fingers. But what if there was a way to streamline this process, making deployments faster and more reliable? Enter Docker and containerization, a technology that's revolutionizing the way applications are built and deployed. This article explores how Netflix, a pioneer in tech innovation, uses Docker to achieve lightning-fast deployments and a more efficient development workflow.
Deploying applications used to be a time-consuming and error-prone process. Developers would meticulously configure environments, ensuring compatibility across different systems. This manual approach was slow and prone to errors, often leading to delays and frustration. Virtualization emerged as a partial solution, allowing multiple applications to run on a single server. However, virtual machines still carried resource overhead and lacked true portability.
Then came containerization, a game-changer in the deployment world. It revolves around the concept of containers: lightweight, self-contained packages that bundle an application with all its dependencies. Imagine a shipping container loaded with everything an application needs to run – code, libraries, configurations. This container can then be shipped anywhere, as long as the system has Docker installed, ensuring the application runs identically regardless of the environment. Containerization offers several advantages: faster deployments, improved scalability, and increased development agility.
Netflix, a company known for pushing boundaries, recognized the potential of Docker early on. They began integrating Docker into their [Netflix architecture](https://www.clickittech.com/application-architecture/netflix-architecture/?utm_source=backlinks&utm_medium=referral), a complex system built on microservices – small, independent services that work together. However, integrating a new technology into an existing system wasn't without challenges. Netflix had to adapt their workflows and overcome compatibility hurdles. But their commitment to innovation paid off.
Docker became a cornerstone of the Netflix development lifecycle. Developers now build and test their microservices within containers, ensuring consistency from the very beginning. Testing environments are also containerized, guaranteeing applications behave the same way during testing as they will in production. This eliminates surprises and streamlines the development process. Before pushing updates live, Netflix stages them in containerized environments, catching any potential issues before they impact users. Finally, in production, applications run within Docker containers, ensuring smooth operation and easy scaling. To manage these containers at scale, Netflix utilizes container orchestration tools like Kubernetes, but that's a story for another day.
The benefits of Docker for Netflix are undeniable. Deployment times have significantly decreased, with updates rolling out much faster. Scaling applications is now a breeze – simply add or remove containers as needed. This agility allows Netflix to experiment more freely and respond quickly to user feedback. Development teams have also seen a boost in productivity. They can focus on writing code and building features instead of wrestling with deployment complexities. Additionally, containerization ensures consistent environments across development, testing, and production, minimizing errors and headaches. Ultimately, these advantages translate into a better user experience for Netflix subscribers. Faster deployments mean new features and bug fixes arrive sooner, and a smooth-running platform translates into uninterrupted streaming enjoyment.
Netflix's success with Docker has had a ripple effect across the tech industry. More and more companies are embracing containerization, reaping the benefits of faster deployments, improved scalability, and a more efficient development process. From e-commerce giants to financial institutions, containerization is transforming the way applications are built and delivered.
For example, Spotify, another major streaming service, has adopted Docker to streamline their deployments and ensure consistent delivery across different environments. Their containerized architecture allows them to quickly roll out new features and bug fixes, keeping their platform up-to-date and competitive.
In conclusion, Netflix's pioneering work with Docker has significantly impacted the software development landscape. Containerization offers a powerful solution for achieving faster deployments and a more efficient development process. As containerization technologies continue to evolve, we can expect to see even more companies leverage its power to build and deliver innovative applications at lightning speed. | marufhossain | |
1,890,045 | Why Rust is More Than Just a Hype: A Developer’s Perspective | Memory Safety Without Garbage Collection: Rust ensures memory safety by using a borrow checker to... | 0 | 2024-06-16T06:08:43 | https://dev.to/bingecoder89/why-rust-is-more-than-just-a-hype-a-developers-perspective-9o0 | rust, beginners, programming, codenewbie | 1. **Memory Safety Without Garbage Collection**:
Rust ensures memory safety by using a borrow checker to enforce strict ownership rules at compile time, eliminating many common bugs such as null pointer dereferences and buffer overflows without needing a garbage collector.
2. **Performance Comparable to C/C++**:
Rust's performance is on par with C and C++ due to its low-level control over system resources and zero-cost abstractions, making it suitable for high-performance applications like game engines and operating systems.
3. **Concurrency Without Data Races**:
Rust provides robust concurrency support by preventing data races at compile time through its ownership and borrowing system, making it easier to write safe and efficient concurrent code.
4. **Modern Tooling and Ecosystem**:
Rust boasts excellent tooling, including the Cargo package manager and build system, which simplifies dependency management and project setup, alongside a growing ecosystem of libraries and frameworks.
5. **Strong Community and Corporate Support**:
The Rust community is vibrant and welcoming, with strong backing from companies like Mozilla, Microsoft, and Amazon, ensuring continuous development and support for the language.
6. **Versatile Use Cases**:
Rust is versatile, suitable for systems programming, web development with frameworks like Rocket and Actix, and even embedded programming, demonstrating its flexibility across various domains.
7. **Innovative Features**:
Rust introduces innovative features such as algebraic data types, pattern matching, and trait-based generics, which enhance code expressiveness and reliability.
8. **Safety and Speed in Embedded Systems**:
Rust's guarantees around safety and performance make it an excellent choice for embedded systems, where resource constraints and reliability are paramount.
9. **Growing Job Market**:
With the increasing adoption of Rust in industry, there's a growing demand for Rust developers, making it a valuable skill in the job market.
10. **Active Development and Evolution**:
Rust is continuously evolving with regular updates and new features, driven by an active open-source community and a transparent governance model, ensuring the language remains modern and relevant.
Happy Learning 🎉 | bingecoder89 |
1,890,044 | Unlock Your Business Potential with Joy Services | At Joy Services, we offer a range of powerful and flexible cloud services designed to take your... | 0 | 2024-06-16T06:03:38 | https://dev.to/joyservices/unlock-your-business-potential-with-joy-services-1k7o | server, webdev, web, welcome |
At Joy Services, we offer a range of powerful and flexible cloud services designed to take your business to the next level. Our team of experts is dedicated to ensuring you have the resources and support necessary to achieve your goals.
## Our Services
**Virtual Private Servers (VPS):**
Scalable and customizable hosting solutions for your applications, websites, and services. High-performance infrastructure with robust security features to ensure your data stays safe.
**Remote Desktop Protocol (RDP):**
Access your virtual desktop and applications securely from anywhere in the world. Seamless collaboration and productivity for remote teams with reliable RDP connections.
**Gaming Servers:**
Fully managed servers for hosting games with lots of players, ensuring high performance and low latency.
**Dedicated Servers:**
Complete control over your gaming environment with customizable settings.
**Hosting Storage:**
Scalable cloud storage for data access, storage, sharing, and collaboration.
**Hosting PHP & MySQL:**
Latest versions of PHP and MySQL, with unlimited MySQL databases.
**WordPress Hosting:**
Speed, security, and simplicity for your WordPress website.
**Email Hosting:**
Professional, reliable email hosting with spam protection, autoresponders, and email forwarding.
**License Server:**
Manage licenses for your networked computers with our license server.
## Why Choose Joy Services
**Reliability:**
Industry-leading uptime guarantees and 24/7 technical support to keep your business running smoothly.
**Scalability:**
Scale your resources up or down based on your business needs, ensuring you have the flexibility to grow.
**Security:**
Robust encryption, firewalls, and regular security updates to keep your data safe.
**Affordability:**
Competitive pricing plans tailored to fit businesses of all sizes, without compromising on quality.
**Get Started Today:**
Ready to elevate your business with our reliable cloud services? Reach out to us today to learn more about how we can help you achieve your goals. Our team is always here to guide you through each step of the process.
**Stay Connected:**
Follow us for the latest news and trends in technology and business. Let's build something great together!Best regards, Striker [Joy Services](https://joy.services/)
| strikerboy |
1,890,043 | Database1 | Database Concepts MySQL v5.7 (RDBMS) Oracle 11g(ORDBMS) MongoDB (NoSQL... | 0 | 2024-06-16T06:03:11 | https://dev.to/dwivedialind/database1-5h91 | beginners, learning, database, sql | ## Database Concepts
**_MySQL v5.7 (RDBMS)_**
**_Oracle 11g(ORDBMS)_**
**_MongoDB (NoSQL DBMS)_**
- DBMS(**Database Management System**): Software that helps to manage data
```bash
Various DBMS available
MSExcel, FoxBASE, FoxPro, DataEase, DataFlex, Clipper, DB Vista etc
```
### Some Important Definitions
1. RDBMS: Relational Database Management System
2. ORDBMS: Object Relational DBMS (RDBMS+OODBMS)
3. OODBMS: Object Oriented DBMS
4. Database: Collection of Large amounts of data.
5. **_ANSI definition of DBMS_** : collection of programs that allows you to perform CRUD operations of data.
- **_Computer_**: Processing(work done by computer) raw data to meaningful data/ processed data/ information.
### DBMS vs RDBMS
1. Difference in Nomenclature
- Field - attribute/column
- Record - tuple/row/entity
- File - table/relation
2. Relationship between two file is maintained programmatically.
vs
Relationship between 2 tables can be specified at the time of table creation using constraint.
3. More Programming
vs
Less Programming
4. More time required for s/w development
vs
Less time require for s/w development
> Let's take an example of Server with Employee data is located in Delhi and Client in Pune,
> Now In DBMS to access Employees with Salary > $1000, we have to copy files to Pune then after processing, send the data back to Delhi (Server location)
> vs
> In RDBMS we can process data on server only.
5. High Network Traffic
vs
Low Network Traffic
6. Slow & expensive
vs
Faster (in terms of network speed) and cheaper (in terms of hardware cost, network cost, infrastructure cost)
7. Processing on Client Machine
vs
Processing on Server Machine(**Client-Server Architecture**)
> Most of the RDBMS Support Client-Server Architecture. (exception is MS Access->**local Database on same machine**)
8. File level Locking(**not suitable for multi-user**)
vs
Row level Locking(internally table is not a file, internally every row is a file)
> Suppose there is a Server located in Delhi, with **_Pune_** and **_Hyderabad_** as client, now in DBMS is **_Pune_** tries to update any table in Server then that table is locked for **_Hyderabad_**
> vs
> In RDBMS only row is locked .
9. Distributed databases not supported
vs
Most of the RDBMS support Distributed Databases (**Banking system is an example of Distributed Databases**)
10. No security (of data)
- DBMS is dependent of OS for security
- DBMS allows access to the data through the OS
- Security is not a built-in feature of DBMS
vs
Multiple Levels of Security
- Logging in Security (MySQL database username and password)
- Command level Security (permission to issue MySQL commands)
- create table, create function, create user, etc
- Object level Security (access to table and objects of other users)
- Various RDMBS available:
- Informix (fastest in terms of processing speed)
- Oracle (most popular RDBMS)
- works on 113 OS
- 63% of world commercial DB market in Client-Server Environment
- 86% of world commercial DB market in the Internet Environment
- Sybase (Good RDBMS)
- MS SQL Server
- Only works with Windows OS
- MS Access (Single User)
- DB2 (MainFrame Computer from IBM)
- Postgres (Open source)
**_ Our Focus will be on MySQL _**
## MySQL
1. Launched by Swedish company in 1995.
2. MySQL is a open-source RDBMS (most widely used open-source RDBMS).
3. Part of **\*LAMP** open-source web-development.
4. Sun Microsystems acquired MySQL in 2008
5. Oracle Corporation acquired Sun Microsystems in 2010.
```bash
L - Linux
A - Apache Web Server
M - MySQL
P - Perl, Python or PHP
```
### Various S/W development tools from MySQL
1. MySQL Command Line Client (client S/W)
- Used for running SQL commands
- Character based (text based)
- Interface with database
2. MySQL Workbench (client S/W)
- Used for running SQL commands
- GUI based interface with database
3. MySQL Pl
- MySQL Programming Language
- Used for database Programming
4. MySQL Connectors
- for database connectivity (JDBC, ODBC, Python, C, C++ etc)
5. MySQL for Excel
- import, export, and edit MySQL data using MS Excel
6. MySQL Notifier
- Start-up and Shutdown the MySQL database
7. MySQL Enterprise Backup
- export and import of table data
- used to take backups and restore from the backups
8. MySQL Enterprise High Availability
- for replication (also know as data mirroring) concept of standby database
9. MySQL Enterprise Encryption
- used to encrypt table data
10. MySQL Enterprise Manager
- for performance monitoring, and performance tuning
11. MySQL Query Analyzer
- for query tuning
### SQL
- Structured Query Language
- Commonly pronounced as "Sequel"
- conforms to ANSI standards (e.g 1 character = 1 Byte)
- Conforms to ISO standards (for QA)
- Common for all RDBMS(hence also known as RDBMS)
- Initially founded by IBM (1975-77)
- Initially known as RQBE (Relational Query by Example)
- IBM gave RQBE free of cost to ANSI
- ANSI renamed RQBE to SQL (Now, controlled by ANSI6)
- In 2005, source code of SQL was rewritten in Java(100%)
> **_Every row in Table is a file, Table is not a file which helps us achieve row-level locking._**
#### Divisions of SQL
1. DDL (Data Definition Language): Create, Drop, Alter
2. DML (Data Manipulation Language): Insert, Update, Delete
3. DCL (Data Control Language): Grant, Revoke
4. DQL (Data Query Language): Select
```bash
Extra in Oracle RDBMS and MySQL
1. DTL/TCL (Data Transaction Language)/(Transaction Control Language)
Commit, Rollback, Savepoint
2. DDL
Rename, Truncate
Extra in Oracle RDBMS only:
1. DML
(Merge, Upsert(Update+Insert))
```
**_Rules for Table Names, columns names and variable names_**
- Oracle: Max 30 characters MySQL: Max 64 characters
- A-Z, a-z, 0-9 allowed
- Has to begin with an alphabet
- Special characters, $, #, \_ allowed
- In MySQL to use reserved characters such as <code>#</code> int tableName and column Name, enclose it in backquotes(``).
`EMP#`
- 134 reserved words not allowed
> **_Under Linux & Unix, table_name and column_name are case-sensitive. But in Windows & macos are not case-sensitive_**
| dwivedialind |
1,890,042 | GitHub - Commit, Pull Request, Merge | To clone repository on local system -> git clone <repository-url> Enter fullscreen... | 0 | 2024-06-16T06:02:44 | https://dev.to/alamfatima1999/github-commit-pull-request-merge-4n3h | To clone repository on local system ->
```
git clone <repository-url>
```
Get inside the local repo branch
Check which branch you are in and all current branches available on local system ->
```
git branch
```
If required branch not found, get all current branches from GitHub ->
```
git fetch
```
.
To get into a different branch ->
```
git checkout <that-branch-url>
```
To check changes in current branch ->
```
git status
```
To add changes to stage ->
```
git add <files-to-be-staged>
```
To commit those changes ->
```
git commit -m "message"
```
.
To push those changes in that branch ->
```
git push
```
To merge it in main branch (or any branch) -> create pull request from that branch.
Go to the branch requested and accept that merge request | alamfatima1999 | |
1,890,041 | A Beginner's Guide to Component Design in React | Introduction React is a popular JavaScript library used for building user interfaces,... | 0 | 2024-06-16T06:02:29 | https://dev.to/lovishduggal/a-beginners-guide-to-component-design-in-react-521g | webdev, beginners, react, javascript | ## Introduction
**React** is a popular JavaScript library used for building user interfaces, especially for single-page applications. One of the key concepts in React is component design. Components are the building blocks of a React application. Understanding how to create and use them effectively is crucial for building efficient and maintainable applications. This article will explain component design in React in simple terms, with plenty of examples to make it easy to understand.
## What is a Component?
A **component** in React is like a small, reusable piece of code that defines a part of the user interface. Think of components like LEGO blocks. Just as you can use LEGO blocks to build different structures, you can use React components to build different parts of a web application.
**Everyday Example**:
Imagine a car. A car is made up of many parts like the engine, wheels, and seats. Each of these parts can be considered a component. In the same way, a web page can be made up of different components like a header, footer, and content area.
In a React application, components can be nested inside other components to create complex UIs. Each component is responsible for rendering a small part of the user interface.
## Types of Components
### Functional Components
A **functional component** is a simple JavaScript function that takes props as an argument and returns a React element. These components are easy to write and understand.
**Example**:
```javascript
function Welcome(props) {
return <h1>Hello, {props.name}!</h1>;
}
```
In this example, Welcome is a functional component that accepts props and returns a greeting message.
**When to use functional components**:
* When you need a simple, stateless component
* For better performance in most cases
* With React Hooks, functional components can also manage state and side effects
### Class Components
A **class component** is a more complex component that can hold and manage its own state. It is defined using ES6 class syntax.
**Example:**
```javascript
class Welcome extends React.Component {
render() {
return <h1>Hello, {this.props.name}!</h1>;
}
}
```
In this example, Welcome is a class component that also accepts props and returns a greeting message.
**When to use class components:**
* When you need to manage state or lifecycle methods
## Building Your First Component
Let's build a simple functional component and render it in a React application.
**Step-by-step Guide:**
1. **Create a new file called App.js:**
```javascript
import React from 'react';
function App() {
return (
<div>
<h1>My First Component</h1>
<Welcome name="John" />
</div>
);
}
function Welcome(props) {
return <h1>Hello, {props.name}!</h1>;
}
export default App;
```
2. **Render the App component in index.js:**
```javascript
import React from 'react';
import ReactDOM from 'react-dom';
import App from './App';
ReactDOM.render(<App />, document.getElementById('root'));
```
In this example, we created a simple Welcome component that displays a greeting message and used it inside the App component.
## Component Props and State
### Props
**Props** are inputs to a React component. They are passed to the component in the same way that arguments are passed to a function.
**Example of passing props:**
```javascript
function Welcome(props) {
return <h1>Hello, {props.name}!</h1>;
}
<Welcome name="Alice" />
```
In this example, name is a prop passed to the Welcome component
### State
**State** is a way to manage data that can change over time in a component. State is managed within the component and can be updated using the useState Hook in functional components.
**Example of using state:**
```javascript
import React, { useState } from 'react';
function Counter() {
const [count, setCount] = useState(0);
return (
<div>
<p>You clicked {count} times</p>
<button onClick={() => setCount(count + 1)}>
Click me
</button>
</div>
);
}
```
In this example, Counter is a functional component that uses the useState Hook to manage the count state.
## Composing Components
Components can be combined to build more complex UIs. This is called composing components.
**Example:**
```javascript
function App() {
return (
<div>
<Header />
<Content />
<Footer />
</div>
);
}
function Header() {
return <h1>This is the header</h1>;
}
function Content() {
return <p>This is the content</p>;
}
function Footer() {
return <p>This is the footer</p>;
}
```
In this example, App is composed of Header, Content, and Footer components.
## Best Practices in Component Design
* **Keep Components Small**: Break down your UI into small, reusable components. This makes your code easier to manage and understand.
**Example:** In a social media application, instead of having a single large component to handle the entire user profile page, break it down into smaller components like `ProfileHeader`, `ProfilePicture`, `ProfileBio`, and `ProfilePosts`. This makes each component easier to manage and update independently
```javascript
// ProfileHeader.js
import React from 'react';
function ProfileHeader({ name }) {
return <h1>{name}'s Profile</h1>;
}
export default ProfileHeader;
// ProfilePicture.js
import React from 'react';
function ProfilePicture({ imageUrl }) {
return <img src={imageUrl} alt="Profile" />;
}
export default ProfilePicture;
// ProfileBio.js
import React from 'react';
function ProfileBio({ bio }) {
return <p>{bio}</p>;
}
export default ProfileBio;
// ProfilePosts.js
import React from 'react';
function ProfilePosts({ posts }) {
return (
<ul>
{posts.map(post => (
<li key={post.id}>{post.content}</li>
))}
</ul>
);
}
export default ProfilePosts;
// UserProfile.js
import React from 'react';
import ProfileHeader from './ProfileHeader';
import ProfilePicture from './ProfilePicture';
import ProfileBio from './ProfileBio';
import ProfilePosts from './ProfilePosts';
function UserProfile({ user }) {
return (
<div>
<ProfileHeader name={user.name} />
<ProfilePicture imageUrl={user.imageUrl} />
<ProfileBio bio={user.bio} />
<ProfilePosts posts={user.posts} />
</div>
);
}
export default UserProfile;
```
* **Single Responsibility**: Each component should do one thing and do it well. This makes components easier to test and debug.
**Example:** In an e-commerce application, a `ProductCard` component should only be responsible for displaying product information. Any logic related to adding the product to the cart should be handled by a separate `AddToCartButton` component. This separation ensures that each component has a single responsibility.
```javascript
// ProductCard.js
import React from 'react';
function ProductCard({ product }) {
return (
<div>
<h2>{product.name}</h2>
<p>{product.description}</p>
<p>${product.price}</p>
</div>
);
}
export default ProductCard;
// AddToCartButton.js
import React from 'react';
function AddToCartButton({ onAddToCart }) {
return <button onClick={onAddToCart}>Add to Cart</button>;
}
export default AddToCartButton;
// ProductPage.js
import React from 'react';
import ProductCard from './ProductCard';
import AddToCartButton from './AddToCartButton';
function ProductPage({ product, onAddToCart }) {
return (
<div>
<ProductCard product={product} />
<AddToCartButton onAddToCart={onAddToCart} />
</div>
);
}
export default ProductPage;
```
* **Use Props and State Wisely**: Use props to pass data and state to manage data that changes. Avoid using state in too many places; keep it where it makes sense.
**Example:** In a weather application, use props to pass the current weather data to a `WeatherDisplay` component. Use state within a `WeatherFetcher` component to manage the fetching and updating of weather data. This keeps the data flow clear and manageable.
```javascript
// WeatherDisplay.js
import React from 'react';
function WeatherDisplay({ weather }) {
return (
<div>
<h2>Current Weather</h2>
<p>Temperature: {weather.temperature}°C</p>
<p>Condition: {weather.condition}</p>
</div>
);
}
export default WeatherDisplay;
// WeatherFetcher.js
import React, { useState, useEffect } from 'react';
import WeatherDisplay from './WeatherDisplay';
function WeatherFetcher() {
const [weather, setWeather] = useState(null);
useEffect(() => {
fetch('https://api.weatherapi.com/v1/current.json?key=YOUR_API_KEY&q=London')
.then(response => response.json())
.then(data => setWeather(data.current));
}, []);
return weather ? <WeatherDisplay weather={weather} /> : <p>Loading...</p>;
}
export default WeatherFetcher;
```
* **Composition Over Inheritance**: Combine components to create complex UIs instead of using inheritance. This makes your code more flexible and easier to maintain.
**Example:** In a dashboard application, instead of creating a base `Widget` class and inheriting from it, create small, composable components like `ChartWidget`, `TableWidget`, and `SummaryWidget`. Combine these components in a `Dashboard` component to create the final UI. This approach is more flexible and easier to maintain.
```javascript
// ChartWidget.js
import React from 'react';
function ChartWidget() {
return <div>Chart Widget</div>;
}
export default ChartWidget;
// TableWidget.js
import React from 'react';
function TableWidget() {
return <div>Table Widget</div>;
}
export default TableWidget;
// SummaryWidget.js
import React from 'react';
function SummaryWidget() {
return <div>Summary Widget</div>;
}
export default SummaryWidget;
// Dashboard.js
import React from 'react';
import ChartWidget from './ChartWidget';
import TableWidget from './TableWidget';
import SummaryWidget from './SummaryWidget';
function Dashboard() {
return (
<div>
<ChartWidget />
<TableWidget />
<SummaryWidget />
</div>
);
}
export default Dashboard;
```
* **Readable and Maintainable Code**: Write clean and readable code. Use meaningful names for your components and variables. Add comments where necessary to explain complex logic.
**Example:** In a blogging platform, use meaningful names for components like `Post`, `Comment`, and `AuthorBio`. Add comments to explain complex logic, such as how the `Post` component fetches and displays data. This makes the codebase easier for new developers to understand and contribute to.
```javascript
// Post.js
import React from 'react';
// Post.js
import React, { useState, useEffect } from 'react';
function Post({ postId }) {
const [post, setPost] = useState(null);
const [loading, setLoading] = useState(true);
// Fetch the post data when the component mounts
useEffect(() => {
async function fetchPost() {
try {
const response = await fetch(`https://api.example.com/posts/${postId}`);
const data = await response.json();
setPost(data);
} catch (error) {
console.error('Error fetching post:', error);
} finally {
setLoading(false);
}
}
fetchPost();
}, [postId]);
if (loading) {
return <p>Loading...</p>;
}
if (!post) {
return <p>Post not found</p>;
}
return (
<div>
<h2>{post.title}</h2>
<p>{post.content}</p>
</div>
);
}
export default Post;
// Comment.js
import React from 'react';
function Comment({ author, text }) {
return (
<div>
<p><strong>{author}</strong>: {text}</p>
</div>
);
}
export default Comment;
// AuthorBio.js
import React from 'react';
function AuthorBio({ author }) {
return (
<div>
<h3>About the Author</h3>
<p>{author.bio}</p>
</div>
);
}
export default AuthorBio;
// Blog.js
import React, { useState, useEffect } from 'react';
import Post from './Post';
import Comment from './Comment';
import AuthorBio from './AuthorBio';
function Blog({ postId }) {
const [comments, setComments] = useState([]);
const [author, setAuthor] = useState(null);
// Fetch comments and author data when the component mounts
useEffect(() => {
async function fetchComments() {
try {
const response = await fetch(`https://api.example.com/posts/${postId}/comments`);
const data = await response.json();
setComments(data);
} catch (error) {
console.error('Error fetching comments:', error);
}
}
async function fetchAuthor() {
try {
const response = await fetch(`https://api.example.com/posts/${postId}/author`);
const data = await response.json();
setAuthor(data);
} catch (error) {
console.error('Error fetching author:', error);
}
}
fetchComments();
fetchAuthor();
}, [postId]);
return (
<div>
<Post postId={postId} />
{author && <AuthorBio author={author} />}
<h3>Comments</h3>
{comments.map((comment) => (
<Comment key={comment.id} author={comment.author} text={comment.text} />
))}
</div>
);
}
export default Blog;
```
* **Performance Optimization**: Avoid unnecessary re-renders by using React's built-in optimization techniques like `React.memo` and `useCallback`.
**Example**: In a chat application, use `React.memo` to prevent unnecessary re-renders of the `MessageList` component when new messages are added. Use `useCallback` to memoize event handlers in the `MessageInput` component to avoid creating new functions on every render.
```javascript
// MessageList.js
import React from 'react';
const MessageList = React.memo(({ messages }) => {
return (
<ul>
{messages.map(message => (
<li key={message.id}>{message.text}</li>
))}
</ul>
);
});
export default MessageList;
// MessageInput.js
import React, { useState, useCallback } from 'react';
function MessageInput({ onSendMessage }) {
const [text, setText] = useState('');
const handleChange = useCallback((e) => {
setText(e.target.value);
}, []);
const handleSubmit = useCallback((e) => {
e.preventDefault();
onSendMessage(text);
setText('');
}, [text, onSendMessage]);
return (
<form onSubmit={handleSubmit}>
<input type="text" value={text} onChange={handleChange} />
<button type="submit">Send</button>
</form>
);
}
export default MessageInput;
// ChatApp.js
import React, { useState } from 'react';
import MessageList from './MessageList';
import MessageInput from './MessageInput';
function ChatApp() {
const [messages, setMessages] = useState([]);
const handleSendMessage = (text) => {
setMessages([...messages, { id: messages.length, text }]);
};
return (
<div>
<MessageList messages={messages} />
<MessageInput onSendMessage={handleSendMessage} />
</div>
);
}
export default ChatApp;
```
* **Consistent Styling**: Use a consistent approach for styling your components. This could be CSS modules, styled-components, or another method that works for your team.
**Example**: In a corporate website, use CSS modules to ensure that styles are scoped to individual components, preventing style conflicts. Alternatively, use a library like `styled-components` to create consistent, reusable styles across the application.
```javascript
// ProfileHeader.module.css
.header {
font-size: 2em;
color: blue;
}
// ProfileHeader.js
import React from 'react';
import styles from './ProfileHeader.module.css';
function ProfileHeader({ name }) {
return <h1 className={styles.header}>{name}'s Profile</h1>;
}
export default ProfileHeader;
// Profile.js
import React from 'react';
import ProfileHeader from './ProfileHeader';
function Profile({ user }) {
return (
<div>
<ProfileHeader name={user.name} />
{/* Other components */}
</div>
);
}
export default Profile;
```
By following these best practices, you can create React components that are easy to use, maintain, and scale.
## Conclusion
By mastering the fundamentals of component design in React, you'll be ready to create scalable, efficient, and maintainable web applications. Components are the building blocks of React, and understanding how to effectively use and combine them is crucial. Remember to follow best practices, such as keeping components small, using props and state wisely, and optimizing performance. With these skills, you'll be able to build advanced user interfaces easily. You can now research more about it online. If you'd like, you can connect with me on [**Twitter**](https://twitter.com/lovishdtwts). Happy coding!
Thank you for Reading :) | lovishduggal |
1,890,018 | Websites to Inspire Web Design and Development in 2024 | Essential Websites for Web Design Inspiration and Latest Trends in 2024 In 2024, the... | 0 | 2024-06-16T06:00:00 | https://travislord.xyz/articles/websites-to-inspire-web-design-and-development-in-2024 | webdev, tutorial, learning, opensource | ## Essential Websites for Web Design Inspiration and Latest Trends in 2024
In 2024, the demand for unique, high-converting websites is skyrocketing. As a web designer or developer, it's crucial to stay ahead of the curve by exploring top-notch web design inspirations. By leveraging the latest web design trends, responsive web design techniques, and innovative web development strategies, you can create visually stunning and high-converting websites. Here are a few essential websites for finding stellar web design ideas, understanding modern website examples, and keeping up with the latest trends in web design:
## Dark Mode Design
For enthusiasts of dark mode, this site is a treasure trove of inspiration. The collection is impressive and diverse, showcasing some of the best dark mode web design examples. It's a perfect place to find cutting-edge web design trends for 2024.
[Visit Website](https://www.darkmodedesign.com/)
## Footer Design
It focuses on exceptional footer designs. Wondering why focus only on footers? Just visit and see the variety—it’s impressive and inspiring. This site is ideal for those seeking specific elements of web design inspiration, particularly for footer design.
[Visit Website](https://www.footer.design/)
## Minimal Design
As a fan of both dark mode and minimalist designs, this site is a personal favorite. It features not only minimal designs but also some elegantly complex ones. Minimal Design is a great resource for anyone looking for clean, modern website examples and the latest web design inspirations.
[Visit Website](https://minimal.gallery/)
## SaaSpo
If SaaS websites are your thing, SaaSpo is a goldmine. It’s a carefully picked collection of the finest SaaS websites, featuring some of the best modern website examples. You can explore inspirations based on specific pages like homepages and pricing pages, or the tech stack used, including Webflow, WordPress, and Framer. This site is ideal for those looking to understand the latest web design trends in 2024.
[Visit Website](https://www.saaspo.com/)
## Godly
True to its name, Godly offers out-of-this-world web design inspirations from across the internet. Every design here is stunning and perfect for those aiming to craft similar websites. This site is particularly useful for finding creative web design ideas and innovative websites for designers.
[Visit Website](https://godly.website/)
## SaaS Landing Page
This site boasts a fantastic collection of SaaS landing pages, neatly categorized for ease of exploration. It's a great resource for anyone looking for the best web design inspiration, especially those focused on SaaS products and services.
[Visit Website](https://saaslandingpage.com/)
## Refero Design
A one-stop shop for web and app design inspirations. It offers categorization by industry, page pattern, colors, and elements. Note: Full access to premium features is behind a paywall. This site is excellent for finding web design inspiration by specific categories and is particularly useful for professional web designers.
[Visit Website](https://refero.design/)
## Maxi Best Of
Get your daily dose of web design inspiration. Their collection is constantly updated and always fresh, making it a valuable resource for staying current with the latest web design trends in 2024.
[Visit Website](https://maxibestof.one/)
## Page Collective
A wonderful resource for landing page collections. Its easy-to-use left navigation helps in quickly finding specific page types. This site is perfect for those looking to explore the best landing page inspirations categorized by industry and page type.
[Visit Website](https://pagecollective.com/)
## Landingfolio
A classic resource for landing page inspirations, categorizing websites by industry types. Landingfolio is a go-to for designers looking for premium web design templates and the latest landing page trends.
[Visit Website](http://landingfolio.com/)
By exploring these websites, you can find the best web design inspiration and stay updated with the latest trends in 2024. Whether you're into minimalist designs, dark mode themes, responsive web design, or looking for specific page inspirations, these resources have got you covered. These sites offer a comprehensive look at modern website examples, innovative web design techniques, and creative web design ideas that will dominate the web design scene in 2024. By leveraging these inspirations, you can craft high-converting, visually stunning websites or web apps, improve user experience (UX) design, and stay ahead in the competitive web design and development industry.
Before you go please consider supporting by giving a **Hart, Share,** or **Follow**!
* **Visit My Site & Projects**: [Travis lord](https://travislord.xyz/) **|** [Projects](https://travislord.xyz/projects) **|** [About Me](https://travislord.xyz/about) | [Contact](https://travislord.xyz/contact)
* **Follow:** [GitHub](https://github.com/lilxyzz) | [DEV](https://dev.to/lilxyzz) **|** [Linkedin](https://au.linkedin.com/in/travis-lord-16b947108/) **|** [Medium](https://medium.com/@travis.lord) | lilxyzz |
1,890,040 | Differences in traditional and web3/blockchain front end development | Web3/Blockchain front end development differs from traditional/web2 front end development in certain... | 0 | 2024-06-16T05:47:24 | https://dev.to/muratcanyuksel/differences-in-traditional-and-web3blockchain-front-end-development-3494 | solidity, blockchain, react, web3 | Web3/Blockchain front end development differs from traditional/web2 front end development in certain ways. Here we will look at how they differ in interacting with the back end, and how they handle authentication.
In the traditional system, the front end interacts with a server. That server might have been written with NodeJS, Python, Go, PHP or any other suitable language. The back end would give some API endpoints to front end to call. In the front end, the developer could send CRUD requests, that are:
Create: POST requests to send new data to the server.
Read: GET requests to retrieve data from the server.
Update: PUT or PATCH requests to modify existing data on the server.
Delete: DELETE requests to remove data from the server.
In web3/blockchain development, there is no centralized server, there's the blockchain... We can think of blockchain as a huuuuge server plus database. I'm sure there are many people who'd grill me for this oversimplicated definition of what a blockchain is, but whatever. In order to 'serve' your own code, called smart contracts in Ethereum, in the blockchain, you have to deploy it, and deployment costs real money (gas in Ethereum). Once the smart contracts are deployed, in order to interact with it, the front end can make read and write calls. No, no CRUD in here. No API endpoints, no axios. The idea is the same, but the method is just a bit different, that's all.
Read: Calls to the blockchain to retrieve data, typically using "call" methods which do not require a transaction or gas fees (free to call). For example, querying a smart contract to get data without altering the blockchain state.
Write: Transactions that modify the blockchain state, which involve sending data to the blockchain and usually require gas fees (costs real money). This can be adding new data, updating existing data, or executing functions that change the state of a smart contract.
In short, if you just want to peek, it's all okay. But if you want to change something in the blockchain, or send a POST or DELETE request in the traditional sense, you have to pay.
**DIFFERENCES IN AUTHENTICATION**
We all know how authentication works pretty much everywhere. You either give the system your email address, create a password, or you can create an account using your existing Google, Facebook, GitHub account etc. In any case, you need to create a new account for each and every different app.
In development, authentication for some reason is one of my least favorite things to work on. You can use session tokens, JWT, OAuth, use Firebase, just save the email and password in the database...
Web3 differs heavily in authentication. I personally love it. You have a wallet like Metamask, Coinbase Wallet etc., that is generally a browser extension. When you want to use a dApp (decentralized application), you just sign in with your wallet. No registration, no email, no passwords, nothing. Just your wallet. Say you want to leave the dApp, you didn't like it? You own your data, you can just leave. Imagine owning all of your Facebook photos, comments, posts, everything and when you leave Facebook, you can take all of them into Twitter, or LinkedIn. How convenient is this!
Web3 authentication is super smooth in development too, again in my opinion. There's little to do other then integrating the necessary providers.
**###############**
If you're looking for full stack blockchain development services, check out my business page => https://www.muratcanyuksel.xyz/
I offer:
- Token smart contract creation
- Token sale dApp
- NFT platforms
- DeFi applications
- DAO development
- Marketing referral system
Smart contracts and Front end development + smart contract integration included.
**###############**
| muratcanyuksel |
1,578,481 | How to use Stable Diffusion to create AI-generated images | The convergence of Artificial Intelligence (AI) and art has birthed captivating new horizons in... | 0 | 2024-06-16T05:15:08 | https://dev.to/ajeetraina/how-to-use-stable-diffusion-to-create-ai-generated-images-2497 | ai, docker, stablediffusion | The convergence of Artificial Intelligence (AI) and art has birthed captivating new horizons in creative expression. Among the innovative techniques, Stable Diffusion shines as a remarkable method that leverages neural networks to produce awe-inspiring AI-generated images. In this blog post, we embark on an exploration of Stable Diffusion, unveiling its mechanics and demonstrating how it can be harnessed to fashion enthralling visual artworks.
## Understanding Stable Diffusion
Stable Diffusion, a fusion of AI and image manipulation, is a process that involves iteratively transforming an initial image into a new composition. The term "stable" signifies the control imbued in the transformation, ensuring a balance between innovation and coherence.
## The Workflow of Stable Diffusion
## Initialization and Preprocessing
Let's begin by loading an initial image and preprocessing it to normalize pixel values.
```
import numpy as np
import matplotlib.pyplot as plt
initial_image = plt.imread("initial_image.jpg")
initial_image = initial_image.astype(np.float32) / 255.0
```
## Defining the Neural Network Architecture
Construct a neural network that will steer the diffusion process. Convolutional Neural Networks (CNNs) are often used for their adeptness in recognizing intricate features.
```
import tensorflow as tf
def create_diffusion_network():
model = tf.keras.Sequential([
tf.keras.layers.Conv2D(64, (3, 3), activation='relu', padding='same'),
tf.keras.layers.Conv2D(64, (3, 3), activation='relu', padding='same'),
# Additional layers...
])
return model
diffusion_net = create_diffusion_network()
```
## Performing Controlled Diffusion
Apply the neural network to the initial image over multiple iterations while ensuring controlled diffusion.
```
def perform_diffusion(image, network, iterations, diffusion_strength):
generated_image = image.copy()
for _ in range(iterations):
diffused_image = network(generated_image)
generated_image = (1 - diffusion_strength) * generated_image + diffusion_strength * diffused_image
return generated_image
iterations = 100
diffusion_strength = 0.2
generated_image = perform_diffusion(initial_image, diffusion_net, iterations, diffusion_strength)
```
## Displaying the Artistry
Let's visualize the transformation by comparing the initial image to the generated masterpiece.
```
plt.figure(figsize=(8, 8))
plt.subplot(1, 2, 1)
plt.imshow(initial_image)
plt.title("Initial Image")
plt.subplot(1, 2, 2)
plt.imshow(generated_image)
plt.title("Generated Image after Stable Diffusion")
plt.show()
```
## A Journey through Creative Parameters
Stable Diffusion opens a portal to experimentation, driven by various parameters:
- Iteration Count: Determines the extent of transformation.
Diffusion Strength: Governs the magnitude of pixel adjustments.
- Noise Injection: Infuses controlled randomness for texture.
Applications and Ethical Implications
Stable Diffusion bears potential across diverse realms:
- Art and Creativity: Empowers artists to meld AI and personal style.
- Concept Visualization: Expresses elusive concepts visually.
- Design and Advertising: Propels captivating design elements.
- Entertainment and Gaming: Enhances visual landscapes in gaming.
However, ethical considerations like attribution and AI's role in creativity warrant thoughtful discourse.
## Conclusion
Stable Diffusion ushers in a new era where AI-generated images bridge technology and creativity. This synthesis carries immense promise, reminding us that even in the realm of automation, the human touch remains irreplaceable. As we traverse the landscape of Stable Diffusion, let's tread with mindfulness, embracing its potential while safeguarding the integrity of artistry. The journey of human-AI co-creation is destined to paint a vibrant canvas of innovation and imagination. | ajeetraina |
1,890,039 | React Context-API Pro | Build state management using useContext + useReducer | Typescript | The Context API in React is a powerful feature that allows you to manage state globally across your... | 0 | 2024-06-16T05:45:30 | https://dev.to/thisisarkajitroy/react-context-api-pro-build-state-management-using-usecontext-usereducer-typescript-3gm1 | javascript, react, reactnative, nextjs | The Context API in React is a powerful feature that allows you to manage state globally across your application without the need to pass props down through multiple levels of your component tree. When combined with TypeScript, it becomes even more robust, providing type safety and better code maintainability. In this article, I'll walk you through setting up a Context API for authentication in a React app using modern conventions and TypeScript.
## Project Structure
First, let's outline the project structure. We'll split our Context setup into four separate files:
**context.tsx:** This file will create and export the context.
**provider.tsx:** This file will provide the context to the component tree.
**reducer.ts:** This file will define the initial state and reducer function.
**actions.ts:** This file will contain action creators.
**state.ts:** This file will contain the initial state of the context
**useAuthContext.ts:** This file contain a custom hook which will help to call context
### 01. Creating the Context
We'll start by creating the **context.tsx** file. This file will initialize the context and provide a custom hook for easy access.
```javascript
import { createContext } from "react";
import { AuthContextProps } from "../types";
export const AuthContext = createContext<AuthContextProps | undefined>(undefined);
```
### 02. Defining the Initial State of the Context
After that we will define the initial state for the context in the **state.ts**. This initial state will be use for storing all the datas.
```javascript
import { AuthState } from "../types";
export const initialState: AuthState = {
isAuthenticated: false,
user: null,
token: null,
};
```
### 03. Setting Up the Provider
Next, we'll set up the provider in the **provider.tsx** file. This component will use the useReducer hook to manage the state and pass it down via the context provider.
```javascript
import React, { useReducer } from "react";
import { AuthProviderProps } from "../types";
import { AuthContext } from "./context";
import { AuthReducer } from "./reducer";
import { initialState } from "./state";
export const AuthProvider: React.FC<AuthProviderProps> = ({ children }) => {
const [state, dispatch] = useReducer(AuthReducer, initialState);
return <AuthContext.Provider value={{ state, dispatch }}>{children}</AuthContext.Provider>;
};
```
### 04. Defining the Reducer
The reducer is the heart of our state management. In the **reducer.ts** file, we'll define our initial state and the reducer function to handle actions.
```javascript
import { AuthAction, AuthState } from "../types";
export const AuthReducer = (state: AuthState, action: AuthAction): AuthState => {
switch (action.type) {
case "LOGIN":
return {
...state,
isAuthenticated: true,
user: action.payload.user,
token: action.payload.token,
};
case "LOGOUT":
return {
...state,
isAuthenticated: false,
user: null,
token: null,
};
default:
return state;
}
};
```
### 05. Creating Actions
Action creators make it easier to dispatch actions in a type-safe way. We'll define these in the **actions.ts** file.
```javascript
import { AuthAction, IUser } from "../types";
export const login = (user: IUser, token: string): AuthAction => {
return {
type: "LOGIN",
payload: { user, token },
};
};
export const logout = (): AuthAction => {
return { type: "LOGOUT" };
};
```
### 06. Configure the custom-hook.
This custom will help use set and call the context in any components without involving multiple parameters into it. Create a file and name it **useAuthContext.ts**.
```javascript
import { useContext } from "react";
import { AuthContext } from "./context";
export const useAuthContext = () => {
const context = useContext(AuthContext);
if (!context) throw new Error("Error: useAuth must be within in AuthProvider");
return context;
};
```
`We are set with all the initial configuration for the state management; now we will see how we can utilize this in our application.`
## Using the Context
To utilize our new AuthContext, we need to wrap our application (or part of it) in the AuthProvider. We'll do this in our main entry point, typically **App.tsx**.
```javascript
import React from "react";
import { AuthProvider } from "./context/provider";
import { BrowserRouter as Router, Routes, Route } from "react-router-dom";
import Home from "./Home";
const App: React.FC = () => {
return (
<AuthProvider>
<Router>
<Routes>
<Route path="/" element={<Home />} />
</Routes>
</Router>
</AuthProvider>
);
};
export default App;
```
Within any component, we can now use the useAuth hook to access the auth state and dispatch actions. Here's an example component that uses our AuthContext:
```javascript
import React from "react";
import { useAuthContext } from "./context/useAuthContext";
import { IUser } from "./types";
import { login, logout } from "./context/actions";
const Home: React.FC = () => {
const { state, dispatch } = useAuthContext();
const handleLoginClick = () => {
const user: IUser = { firstName: "John", lastName: "Doe", role: "SUPER-ADMIN" };
const token = "dfs56ds56f5.65sdf564dsf.645sdfsd4f56";
dispatch(login(user, token));
};
const handleLogoutClick = () => dispatch(logout());
return (
<div>
<h1>Home Page</h1>
{state.isAuthenticated ? (
<div>
<h3>Welcome {state.user?.firstName}</h3>
<button onClick={handleLogoutClick}>Logout</button>
</div>
) : (
<button onClick={handleLoginClick}>Login</button>
)}
</div>
);
};
export default Home;
```
## Types & Interfaces
```javascript
import { Dispatch, ReactNode } from "react";
export interface IUser {
firstName: string;
lastName: string;
role: "SUPER-ADMIN" | "ADMIN" | "USER";
}
export interface AuthState {
isAuthenticated: boolean;
user: null | IUser;
token: null | string;
}
export interface AuthContextProps {
state: AuthState;
dispatch: Dispatch<AuthAction>;
}
export interface AuthProviderProps {
children: ReactNode;
}
export type AuthAction =
| { type: "LOGIN"; payload: { user: IUser; token: string } }
| { type: "LOGOUT" };
```
## Conclusion
By following this structured approach, you can manage global state in your React applications more effectively. The Context API, when used with TypeScript, provides a powerful and type-safe solution for state management. This setup is not only limited to authentication but can be adapted for other use cases like theme management, language settings, and more.
With this knowledge, you can now use Context-API like a pro! Feel free to modify and extend this setup to fit the needs of your own projects.
| thisisarkajitroy |
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Key Technologies Driving Automation
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3. Business Process Management (BPM)
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5. Cloud Computing
6. Natural Language Processing (NLP)
7. Optical Character Recognition (OCR)
8. Automated Testing
9. Workflow Automation
10. Enterprise Resource Planning (ERP) Systems
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1,890,029 | Boost Your Business with Secure and Affordable Server Solutions | Hello Dev.to community! I'm Striker from Joy Services, and I'm excited to introduce our suite of... | 0 | 2024-06-16T05:16:07 | https://dev.to/strikerboy/boost-your-business-with-secure-and-affordable-server-solutions-3hh | server, ubuntu, linux |
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1,890,028 | Exploring HTTP and HTTPS Protocols in Network Security | A Deep Dive into HTTP and HTTPS Protocols in Computer Networks In the modern era, the... | 0 | 2024-06-16T05:15:06 | https://dev.to/iaadidev/exploring-http-and-https-protocols-in-network-security-530j | networking, http, https, protocols | ## A Deep Dive into HTTP and HTTPS Protocols in Computer Networks
In the modern era, the internet is an integral part of daily life, facilitating everything from casual browsing to secure transactions. Two critical protocols enable this vast network of interactions: HTTP (HyperText Transfer Protocol) and HTTPS (HyperText Transfer Protocol Secure). Understanding these protocols, their differences, and their respective roles in internet communication is crucial for anyone involved in web development, cybersecurity, or general tech-savvy users.
### What is HTTP?
HTTP stands for **HyperText Transfer Protocol**. It is the foundation of any data exchange on the Web and it is a protocol used for transmitting hypertext via the internet. This protocol defines how messages are formatted and transmitted, and how web servers and browsers should respond to various commands.
#### The Evolution of HTTP
HTTP has undergone several versions to improve performance, security, and reliability:
1. **HTTP/0.9**: The initial version, simple and focused on basic GET requests.
2. **HTTP/1.0**: Introduced HTTP headers, allowing for more meta-information to be sent and received.
3. **HTTP/1.1**: Enhanced with persistent connections, chunked transfer encoding, and additional cache control mechanisms.
4. **HTTP/2**: Introduced multiplexing, header compression, and binary protocols to improve speed and efficiency.
5. **HTTP/3**: Currently in development, aiming to improve upon HTTP/2 with the QUIC protocol to reduce latency.
#### How HTTP Works
HTTP operates as a request-response protocol in the client-server computing model. The communication typically involves a client (usually a web browser) and a server (hosting the website).
Here's a breakdown of the HTTP request-response cycle:
1. **Client Request**: The client initiates a request to the server. For example, typing `http://example.com` in the browser’s address bar.
- **Request Line**: Contains the HTTP method (GET, POST, etc.), the resource path, and the HTTP version.
- **Headers**: Include metadata such as `Host`, `User-Agent`, `Accept`, etc.
- **Body**: Contains the data sent to the server (used in methods like POST).
Example of an HTTP GET request:
```http
GET /index.html HTTP/1.1
Host: example.com
User-Agent: Mozilla/5.0
Accept: text/html
```
2. **Server Response**: The server processes the request and returns an HTTP response.
- **Status Line**: Contains the HTTP version, status code (200, 404, etc.), and a reason phrase.
- **Headers**: Include metadata such as `Content-Type`, `Content-Length`, etc.
- **Body**: Contains the requested resource (HTML, images, etc.).
Example of an HTTP response:
```http
HTTP/1.1 200 OK
Content-Type: text/html
Content-Length: 137
<html>
<head><title>Example</title></head>
<body>
<h1>Hello, World!</h1>
</body>
</html>
```
### Advantages of HTTP
1. **Simplicity**: Easy to implement and understand, making it ideal for basic web communication.
2. **Statelessness**: Each request is independent, reducing the server's need to store session information.
3. **Flexibility**: Can transfer various types of data such as HTML, images, and videos.
### Disadvantages of HTTP
1. **Security**: Lacks encryption, making it susceptible to eavesdropping and man-in-the-middle attacks.
2. **No Integrity**: Data can be tampered with during transit.
3. **Statelessness**: While an advantage in some cases, it can be a disadvantage when maintaining user sessions.
### What is HTTPS?
HTTPS stands for **HyperText Transfer Protocol Secure**. It is HTTP with an added layer of security, using SSL/TLS (Secure Sockets Layer/Transport Layer Security) to encrypt the data transferred between the client and server. This encryption ensures that even if data is intercepted, it cannot be read or tampered with.
#### How HTTPS Works
HTTPS works similarly to HTTP but adds an additional security layer through SSL/TLS. Here’s a simplified overview of how HTTPS operates:
1. **SSL/TLS Handshake**: When a client connects to an HTTPS server, an SSL/TLS handshake occurs. This process involves:
- **ClientHello**: The client sends a request to initiate a secure connection, specifying supported cipher suites and the protocol version.
- **ServerHello**: The server responds with the chosen cipher suite and its SSL certificate.
- **Key Exchange**: Both parties exchange cryptographic keys to establish a secure session.
- **Secure Connection**: Once the handshake is complete, data transfer begins with encryption.
2. **Encrypted Data Transfer**: All subsequent data exchanged between the client and server is encrypted using the negotiated keys.
Example of an HTTPS GET request using Python’s `requests` library:
```python
import requests
# Send an HTTPS GET request
response = requests.get('https://example.com')
# Print the response text (the HTML content of the page)
print(response.text)
```
### Advantages of HTTPS
1. **Security**: Encrypts data, making it unreadable to eavesdroppers.
2. **Data Integrity**: Ensures that data is not altered during transit.
3. **Authentication**: Verifies the identity of the communicating parties, protecting against phishing attacks.
4. **SEO Benefits**: Search engines prefer HTTPS websites, improving search rankings.
5. **User Trust**: Users are more likely to trust and engage with secure websites.
### Differences Between HTTP and HTTPS
| Feature | HTTP | HTTPS |
|-------------------|-----------------------|-------------------------|
| Security | No encryption | Data is encrypted |
| Default Port | 80 | 443 |
| URL Prefix | http:// | https:// |
| Speed | Faster (no encryption overhead) | Slightly slower (due to encryption) |
| Use Case | Non-sensitive data transfer | Sensitive data transfer (e.g., banking, login information) |
### Implementing HTTPS
To implement HTTPS on your website, you need to obtain an SSL/TLS certificate from a trusted Certificate Authority (CA). Here’s a step-by-step guide to setting up HTTPS using Let's Encrypt, a free, automated, and open CA:
1. **Install Certbot**: Certbot is a tool to obtain and install SSL/TLS certificates automatically.
```bash
sudo apt-get update
sudo apt-get install certbot python3-certbot-nginx
```
2. **Obtain a Certificate**:
```bash
sudo certbot --nginx -d yourdomain.com -d www.yourdomain.com
```
This command configures Nginx to use the obtained certificates and sets up automatic renewal.
3. **Renew Certificates Automatically**:
```bash
sudo certbot renew --dry-run
```
This command tests the renewal process to ensure that certificates can be renewed without issues.
### Real-World Example
Let's look at a practical example of transitioning a website from HTTP to HTTPS.
#### Step 1: Obtain and Install an SSL Certificate
Use Certbot to obtain a certificate from Let's Encrypt:
```bash
sudo certbot --nginx -d example.com -d www.example.com
```
#### Step 2: Configure Your Web Server
Modify your Nginx configuration to redirect HTTP to HTTPS and use the SSL certificate:
```nginx
server {
listen 80;
server_name example.com www.example.com;
return 301 https://$host$request_uri;
}
server {
listen 443 ssl;
server_name example.com www.example.com;
ssl_certificate /etc/letsencrypt/live/example.com/fullchain.pem;
ssl_certificate_key /etc/letsencrypt/live/example.com/privkey.pem;
location / {
proxy_pass http://localhost:3000;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $scheme;
}
}
```
#### Step 3: Test Your Configuration
Ensure your website is accessible over HTTPS and that HTTP requests are redirected to HTTPS.
### Future of HTTP and HTTPS
With the constant evolution of web technologies, HTTP and HTTPS will continue to adapt. HTTP/3, for instance, aims to further reduce latency and improve performance by leveraging the QUIC protocol, which is designed for better handling of network congestion and packet loss.
### Conclusion
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Understanding these protocols is crucial for web developers, network engineers, and anyone involved in maintaining web services. By implementing HTTPS, you not only protect your users' data but also enhance your website's credibility and search engine ranking. As the internet continues to grow and evolve, adopting secure practices like HTTPS will remain essential for fostering a safe and trustworthy online environment. | iaadidev |
1,544,112 | Monitoring Node Health with node-problem-detector in Kubernetes | Kubernetes is a powerful container orchestration platform that allows users to deploy and manage... | 0 | 2024-06-16T05:13:44 | https://dev.to/ajeetraina/monitoring-node-health-with-node-problem-detector-in-kubernetes-4l4i | kubernetes, containers, kubetools | Kubernetes is a powerful container orchestration platform that allows users to deploy and manage containerized applications efficiently. However, the health of the nodes in a Kubernetes cluster is crucial for the overall stability and reliability of the applications running on it. Node problems, such as hardware failures, kernel issues, or container runtime problems, can impact the availability of pods and disrupt the entire cluster.
To address this, Kubernetes offers a tool called node-problem-detector, which aims to detect and report various node problems to the cluster management stack. In this blog, we will explore node-problem-detector, its features, how to deploy it in a Kubernetes cluster, and real-world use-cases with code snippets.
## What is node-problem-detector?
## Background and Motivation
Node problems in a Kubernetes cluster can lead to application disruptions and impact user experience. Issues like hardware failures, kernel panics, or unresponsive container runtimes are challenging to detect early and remediate. The node-problem-detector tool aims to address this problem by making various node problems visible to the upstream layers in the cluster management stack.
## Problem API
node-problem-detector uses two mechanisms to report problems to the Kubernetes API server: Event and NodeCondition. Permanent problems that make the node unavailable for pods are reported as NodeConditions, while temporary problems that have limited impact on pods but are informative are reported as Events.
## Supported Problem Daemons
node-problem-detector consists of multiple problem daemons, each responsible for monitoring specific kinds of node problems. The supported problem daemon types include System Log Monitor, System Stats Monitor, Custom Plugin Monitor, and Health Checker.
## How node-problem-detector Works?
## System Log Monitor
The System Log Monitor is a crucial component of node-problem-detector that monitors system logs and reports problems and metrics according to predefined rules. It collects log data from various sources, including kernel logs, system logs, and container runtime logs.
## Code Snippet: Configuring System Log Monitor
```
node-problem-detector --config.system-log-monitor=config/kernel-monitor.json,config/system-monitor.json
```
## System Stats Monitor
The System Stats Monitor collects various health-related system stats as metrics to provide insights into the node's health status. Although it is not fully supported yet, it's a promising feature for future releases.
## Custom Plugin Monitor
The Custom Plugin Monitor allows users to define and check various node problems using custom check scripts. This flexibility enables users to address node problems specific to their use-cases.
## Health Checker
The Health Checker verifies the health of essential components in the node, such as the kubelet and container runtime. It ensures these components are functioning correctly and reports any issues detected.
## Exporter
The Exporter is responsible for reporting node problems and metrics to certain backends. Supported exporters include the Kubernetes exporter, Prometheus exporter, and Stackdriver exporter.
## Building and Deploying node-problem-detector
## Deploying with Helm
Helm simplifies the deployment of node-problem-detector in a Kubernetes cluster.
## Code Snippet: Deploying with Helm
```
helm repo add deliveryhero https://charts.deliveryhero.io/
helm install --generate-name deliveryhero/node-problem-detector
```
## Manual Installation
For manual installation, you can use YAML manifests to deploy node-problem-detector in your cluster.
## Code Snippet: Manual Installation
- Edit [node-problem-detector.yaml](https://github.com/kubernetes/node-problem-detector/blob/master/deployment/node-problem-detector.yaml) to fit your environment. Set log volume to your system log directory (used by SystemLogMonitor). You can use a ConfigMap to overwrite the config directory inside the pod.
- Edit [node-problem-detector-config.yaml](https://github.com/kubernetes/node-problem-detector/blob/master/deployment/node-problem-detector-config.yaml) to configure node-problem-detector.
- Edit [rbac.yaml](https://github.com/kubernetes/node-problem-detector/blob/master/deployment/rbac.yaml) to fit your environment.
Create the ServiceAccount and ClusterRoleBinding with:
```
kubectl create -f rbac.yaml
```
- Create the ConfigMap with:
```
kubectl create -f node-problem-detector-config.yaml
```
- Create the DaemonSet with:
```
kubectl create -f node-problem-detector.yaml
```
- Apply required manifests
```
kubectl create -f node-problem-detector-config.yaml
kubectl create -f rbac.yaml
kubectl create -f node-problem-detector.yaml
```
## Configuration and Usage:
## Command Line Flags
node-problem-detector provides various command line flags to configure its behavior.
## Code Snippet: Using Command Line Flags
```
node-problem-detector --hostname-override=my-node --enable-k8s-exporter
```
## Configuring System Log Monitor
You can specify the paths to system log monitor configuration files using the --config.system-log-monitor flag.
## Code Snippet: Configuring System Log Monitor
```
node-problem-detector --config.system-log-monitor=config/kernel-monitor.json,config/filelog-monitor.json
```
## Configuring System Stats Monitor
System Stats Monitor is still under development, but it will allow you to collect various health-related system stats as metrics.
## Configuring Custom Plugin Monitor
The Custom Plugin Monitor can be configured with a list of paths to custom plugin monitor configuration files.
## Code Snippet: Configuring Custom Plugin Monitor
```
node-problem-detector --config.custom-plugin-monitor=config/custom-plugin-monitor.json
```
## Enabling Kubernetes Exporter
By default, node-problem-detector exports node problems to the Kubernetes API server. You can disable it using the --enable-k8s-exporter=false flag.
## Code Snippet: Enabling Kubernetes Exporter
```
node-problem-detector --enable-k8s-exporter=false
```
## Prometheus Exporter Configuration
The Prometheus exporter reports node problems and metrics locally as Prometheus metrics.
## Code Snippet: Prometheus Exporter Configuration
```
node-problem-detector --prometheus-port=20257
```
## Stackdriver Exporter Configuration
The Stackdriver exporter reports node problems and metrics to the Stackdriver Monitoring API.
## Code Snippet: Stackdriver Exporter Configuration
```
node-problem-detector --exporter.stackdriver=config/stackdriver-exporter.json
```
## Conclusion
Node-problem-detector is a valuable tool for monitoring node health in Kubernetes clusters. By making node problems visible to the cluster management stack, it enables administrators to detect and address issues before they impact applications. In this blog, we explored the features of node-problem-detector, how to deploy it, and real-world use-cases. Armed with this knowledge, you can enhance the reliability and stability of your Kubernetes clusters and ensure seamless application deployment.
| ajeetraina |
1,890,027 | The stack data structure | This is a submission for DEV Computer Science Challenge v24.06.12: One Byte Explainer. ... | 0 | 2024-06-16T05:09:50 | https://dev.to/dfluechter/the-stack-data-structure-2ifl | devchallenge, cschallenge, computerscience, beginners | *This is a submission for [DEV Computer Science Challenge v24.06.12: One Byte Explainer](https://dev.to/challenges/cs).*
## Explainer
"A stack is a data structure that follows the Last In, First Out (LIFO) principle. Think of it like a stack of plates: you add to the top, and the last plate added is the first one you remove."
## Additional Context
This explanation is designed to simplify the concept of a stack for beginners by using a familiar analogy. It highlights the core behavior of stacks without delving into technical jargon, making it accessible and easy to understand. | dfluechter |
1,890,026 | Seeking Final Year Project Ideas | Hi dev.to community, I’m a final year student studying TYBscIT, and I’m currently looking for ideas... | 0 | 2024-06-16T05:07:49 | https://dev.to/harshchaudhari/seeking-final-year-project-ideas-in-tybscit-1c11 | javascript, node, mongodb, react | Hi dev.to community,
I’m a final year student studying TYBscIT, and I’m currently looking for ideas for my final year project. I have skills in HTML, CSS JS, MERN
**I would love to hear any suggestions or project ideas that you think would be challenging and interesting**. Any advice on how to approach these projects would also be greatly appreciated.
Thank you in advance for your help! | harshchaudhari |
1,890,021 | AWS Global Infrastructure: The Backbone of Modern Cloud Computing | Key Components of AWS Global Infrastructure AWS Regions AWS divides its global operations into... | 0 | 2024-06-16T04:33:10 | https://dev.to/safi-ullah/aws-global-infrastructure-the-backbone-of-modern-cloud-computing-1gd4 | aws, infrastructure, cloud | Key Components of AWS Global Infrastructure
1. AWS Regions
AWS divides its global operations into geographical regions. Each region is a separate geographic area, and every region consists of multiple, isolated locations known as Availability Zones (AZs). As of 2024, AWS has 31 regions worldwide, with several more announced or under development.
2. Availability Zones
An Availability Zone is one or more discrete data centers with redundant power, networking, and connectivity housed in separate facilities. Each region contains multiple AZs, allowing customers to design resilient and fault-tolerant applications. By deploying applications across multiple AZs, businesses can achieve high availability and disaster recovery.
3. Edge Locations
Edge locations are part of AWS’s content delivery network (CDN) known as Amazon CloudFront. They cache copies of your data closer to users, reducing latency and improving performance for content delivery. AWS has over 400 edge locations globally, ensuring fast content delivery to users regardless of their location.
4. Local Zones
AWS Local Zones are extensions of AWS regions that place compute, storage, database, and other select AWS services closer to large population and industry centers. This reduces latency and improves performance for applications that require single-digit millisecond latencies. Local Zones are particularly beneficial for real-time gaming, live video streaming, and machine learning.
5. Wavelength Zones
AWS Wavelength Zones embed AWS compute and storage services within telecommunications providers’ data centers at the edge of the 5G network. This allows developers to build applications that require ultra-low latency, such as IoT devices, machine learning inference at the edge, and augmented reality.
Benefits of AWS Global Infrastructure
1. High Availability and Fault Tolerance
AWS's infrastructure is designed for high availability. By using multiple AZs within a region, businesses can ensure their applications remain available even if one AZ fails. Regions are also isolated from one another, providing an additional layer of fault tolerance.
2. Global Reach
With regions and edge locations spread across the globe, AWS provides businesses with a global footprint. This extensive reach enables companies to serve their customers with low latency and high performance, no matter where they are located.
3. Scalability and Flexibility
AWS infrastructure allows businesses to scale their applications seamlessly. Whether you need to scale up for a global event or down during off-peak times, AWS provides the flexibility to adjust your resources according to your needs.
4. Security and Compliance
AWS places a strong emphasis on security. Each AWS region and AZ is built to the highest security standards, with multiple layers of physical and network security. AWS also complies with numerous global regulatory standards and certifications, making it a trusted platform for industries with stringent compliance requirements.
5. Performance Optimization
The global infrastructure is optimized for performance. By strategically placing data centers and edge locations, AWS minimizes latency and maximizes throughput. Services like AWS Direct Connect provide dedicated network connections to AWS, further enhancing performance for critical applications.
Innovations and Continuous Expansion
AWS continuously innovates and expands its infrastructure to meet the growing demands of its customers. Recent developments include new regions in strategic locations, additional edge locations to improve content delivery, and specialized infrastructure such as Local Zones and Wavelength Zones to cater to emerging technological needs.
New Regions and AZs
AWS frequently announces new regions and AZs to expand its global presence. These additions provide more options for data residency and disaster recovery planning, allowing customers to deploy their applications closer to their user base.
Green Energy Initiatives
AWS is committed to sustainability and aims to power its global infrastructure with 100% renewable energy by 2025. AWS has already made significant investments in solar and wind projects around the world, reducing the carbon footprint of its operations.
Conclusion
The AWS global infrastructure is a cornerstone of its cloud services, providing the foundation for high availability, scalability, and security. By leveraging a vast network of regions, availability zones, edge locations, local zones, and wavelength zones, AWS ensures that businesses can deliver high-performance applications to users worldwide. As AWS continues to innovate and expand, its global infrastructure will remain a critical asset for organizations looking to harness the power of cloud computing.
| safi-ullah |
1,890,025 | Creating Query Builders for Mongoose: Searching, Filtering, Sorting, Limiting, Pagination, and Field Selection | In this blog, we will explore how to implement searching, filtering, sorting, limiting, pagination,... | 0 | 2024-06-16T05:04:24 | https://dev.to/md_enayeturrahman_2560e3/creating-query-builders-for-mongoose-searching-filtering-sorting-limiting-pagination-and-field-selection-395j | In this blog, we will explore how to implement searching, filtering, sorting, limiting, pagination, and field selection in isolation. Afterward, we will create a query builder component that combines all these functionalities, making them reusable across different models. Let's dive in
- This is the thirteenth blog of my series where I am writing how to write code for an industry-grade project so that you can manage and scale the project.
- The first twelve blogs of the series were about "How to set up eslint and prettier in an express and typescript project", "Folder structure in an industry-standard project", "How to create API in an industry-standard app", "Setting up global error handler using next function provided by express", "How to handle not found route in express app", "Creating a Custom Send Response Utility Function in Express", "How to Set Up Routes in an Express App: A Step-by-Step Guide", "Simplifying Error Handling in Express Controllers: Introducing catchAsync Utility Function", "Understanding Populating Referencing Fields in Mongoose", "Creating a Custom Error Class in an express app", "Understanding Transactions and Rollbacks in MongoDB", "Updating Non-Primitive Data Dynamically in Mongoose" and "How to Handle Errors in an Industry-Grade Node.js Application". You can check them in the following link.
https://dev.to/md_enayeturrahman_2560e3/how-to-set-up-eslint-and-prettier-1nk6
https://dev.to/md_enayeturrahman_2560e3/folder-structure-in-an-industry-standard-project-271b
https://dev.to/md_enayeturrahman_2560e3/how-to-create-api-in-an-industry-standard-app-44ck
https://dev.to/md_enayeturrahman_2560e3/setting-up-global-error-handler-using-next-function-provided-by-express-96c
https://dev.to/md_enayeturrahman_2560e3/how-to-handle-not-found-route-in-express-app-1d26
https://dev.to/md_enayeturrahman_2560e3/creating-a-custom-send-response-utility-function-in-express-2fg9
https://dev.to/md_enayeturrahman_2560e3/how-to-set-up-routes-in-an-express-app-a-step-by-step-guide-177j
https://dev.to/md_enayeturrahman_2560e3/simplifying-error-handling-in-express-controllers-introducing-catchasync-utility-function-2f3l
https://dev.to/md_enayeturrahman_2560e3/understanding-populating-referencing-fields-in-mongoose-jhg
https://dev.to/md_enayeturrahman_2560e3/creating-a-custom-error-class-in-an-express-app-515a
https://dev.to/md_enayeturrahman_2560e3/understanding-transactions-and-rollbacks-in-mongodb-2on6
https://dev.to/md_enayeturrahman_2560e3/updating-non-primitive-data-dynamically-in-mongoose-17h2
https://dev.to/md_enayeturrahman_2560e3/how-to-handle-errors-in-an-industry-grade-nodejs-application-217b
### Introduction
Efficiently querying a database is crucial for optimizing application performance and enhancing user experience. Mongoose, a popular ODM (Object Data Modeling) library for MongoDB and Node.js, provides a powerful way to interact with MongoDB. By creating a query builder class, we can streamline the process of constructing complex queries, making our code more maintainable and scalable.
### Searching and Filtering
In an HTTP request, we can send data in three ways: through the body (large chunks of data), params (dynamic data like an ID), and query (fields needed for querying). Query parameters, which come as an object provided by the Express framework, consist of key-value pairs. Let's start with a request containing two queries:
```javascript
/api/v1/students?searchTerm=chitta&email=enayet@gmail.com
```
Here, searchTerm is used for searching with a partial match, while email is used for filtering with an exact match. The searchable fields are defined on the backend.
### Method Chaining
Understanding method chaining is crucial for this implementation. If you're unfamiliar with it, you can read my blog on Method Chaining in Mongoose: A Brief Overview.
https://dev.to/md_enayeturrahman_2560e3/method-chaining-in-mongoose-a-brief-overview-44lm
### Basic query
We will apply our learning in the following code:
```javascript
import { Student } from './student.model';
const getAllStudentsFromDB = async () => {
const result = await Student.find()
.populate('admissionSemester')
.populate({
path: 'academicDepartment',
populate: {
path: 'academicFaculty',
},
});
return result;
};
export const StudentServices = {
getAllStudentsFromDB,
};
```
- The code for search:
```javascript
import { Student } from './student.model';
const getAllStudentsFromDB = async (query: Record<string, unknown>) => { // received query as a param from the controller file. We do not know the type of the query as it could be anything, so we set it as a record; its property will be a string and value is unknown.
let searchTerm = ''; // SET DEFAULT VALUE. If no query is sent from the frontend, it will be an empty string.
const studentSearchableFields = ['email', 'name.firstName', 'presentAddress']; // fields in the document where the search will take place. We should keep it in a separate constant file. You can add or remove more fields as per your requirement.
// IF searchTerm IS GIVEN, SET IT
if (query?.searchTerm) {
searchTerm = query?.searchTerm as string;
}
const searchQuery = Student.find({
$or: studentSearchableFields.map((field) => ({
[field]: { $regex: searchTerm, $options: 'i' },
})),
});
// Here we are chaining the query above and executing it below using await
const result = await searchQuery
.populate('admissionSemester')
.populate({
path: 'academicDepartment',
populate: {
path: 'academicFaculty',
},
});
return result;
};
export const StudentServices = {
getAllStudentsFromDB,
};
```
- We can use method chaining to make the above code cleaner as follows
```javascript
import { Student } from './student.model';
const getAllStudentsFromDB = async (query: Record<string, unknown>) => { // received query as a param from the controller file. We do not know the type of the query as it could be anything, so we set it as a record; its property will be a string and value is unknown.
let searchTerm = ''; // SET DEFAULT VALUE. If no query is sent from the frontend, it will be an empty string.
const studentSearchableFields = ['email', 'name.firstName', 'presentAddress']; // fields in the document where the search will take place. We should keep it in a separate constant file. You can add or remove more fields as per your requirement.
// IF searchTerm IS GIVEN, SET IT
if (query?.searchTerm) {
searchTerm = query?.searchTerm as string;
}
// The find operation is performed in the Student Collection. The MongoDB $or operator is used here. The studentSearchableFields array is mapped, and for each item in the array, the property in the DB is searched with the search term using regex to get a partial match. 'i' is used to make the search case-insensitive.
const result = await Student.find({
$or: studentSearchableFields.map((field) => ({
[field]: { $regex: searchTerm, $options: 'i' },
})),
})
.populate('admissionSemester')
.populate({
path: 'academicDepartment',
populate: {
path: 'academicFaculty',
},
});
return result;
};
export const StudentServices = {
getAllStudentsFromDB,
};
```
- Now we will implement filtering. Here we will match the exact value:
```javascript
import { Student } from './student.model';
const getAllStudentsFromDB = async (query: Record<string, unknown>) => { // explained earlier
const queryObj = { ...query }; // copying req.query object so that we can mutate the copy object
let searchTerm = ''; // explained earlier
const studentSearchableFields = ['email', 'name.firstName', 'presentAddress']; // explained earlier
// explained earlier
if (query?.searchTerm) {
searchTerm = query?.searchTerm as string;
}
const searchQuery = Student.find({
$or: studentSearchableFields.map((field) => ({
[field]: { $regex: searchTerm, $options: 'i' },
})),
});
// FILTERING FUNCTIONALITY:
const excludeFields = ['searchTerm'];
excludeFields.forEach((el) => delete queryObj[el]); // DELETING THE FIELDS SO THAT IT CAN'T MATCH OR FILTER EXACTLY
// explained earlier
const result = await searchQuery
.find(queryObj)
.populate('admissionSemester')
.populate({
path: 'academicDepartment',
populate: {
path: 'academicFaculty',
},
});
return result;
};
export const StudentServices = {
getAllStudentsFromDB,
};
```
- For sorting, the query will be as follows
```javascript
/api/v1/students?sort=email //for ascending
/api/v1/students?sort=-email //for descending
```
- The code for sorting will be as follows, including previous queries:
```javascript
import { Student } from './student.model';
const getAllStudentsFromDB = async (query: Record<string, unknown>) => { // explained earlier
const queryObj = { ...query }; // copying req.query object so that we can mutate the copy object
let searchTerm = ''; // explained earlier
const studentSearchableFields = ['email', 'name.firstName', 'presentAddress']; // explained earlier
// explained earlier
if (query?.searchTerm) {
searchTerm = query?.searchTerm as string;
}
const searchQuery = Student.find({
$or: studentSearchableFields.map((field) => ({
[field]: { $regex: searchTerm, $options: 'i' },
})),
});
// FILTERING FUNCTIONALITY:
const excludeFields = ['searchTerm', 'sort'];
excludeFields.forEach((el) => delete queryObj[el]); // DELETING THE FIELDS SO THAT IT CAN'T MATCH OR FILTER EXACTLY
// explained earlier
const filteredQuery = searchQuery // change the variable name to filteredQuery and await is removed from it. so here we are chaining on searchQuery
.find(queryObj)
.populate('admissionSemester')
.populate({
path: 'academicDepartment',
populate: {
path: 'academicFaculty',
},
});
let sort = '-createdAt'; // By default, sorting will be based on the createdAt field in descending order, meaning the last item will be shown first.
if (query.sort) {
sort = query.sort as string; // if the query object has a sort property, then its value is assigned to the sort variable.
}
const sortQuery = await filteredQuery.sort(sort); // method chaining is done on filteredQuery
return sortQuery;
};
export const StudentServices = {
getAllStudentsFromDB,
};
```
- Now we will limit data using the query, and it will be done on top of the above code:
```javascript
import { Student } from './student.model';
const getAllStudentsFromDB = async (query: Record<string, unknown>) => { // explained earlier
const queryObj = { ...query }; // copying req.query object so that we can mutate the copy object
let searchTerm = ''; // explained earlier
const studentSearchableFields = ['email', 'name.firstName', 'presentAddress']; // explained earlier
// explained earlier
if (query?.searchTerm) {
searchTerm = query?.searchTerm as string;
}
const searchQuery = Student.find({
$or: studentSearchableFields.map((field) => ({
[field]: { $regex: searchTerm, $options: 'i' },
})),
});
// FILTERING FUNCTIONALITY:
const excludeFields = ['searchTerm', 'sort', 'limit'];
excludeFields.forEach((el) => delete queryObj[el]); // DELETING THE FIELDS SO THAT IT CAN'T MATCH OR FILTER EXACTLY
// explained earlier
const filteredQuery = searchQuery // change the variable name to filteredQuery and await is removed from it. so here we are chaining on searchQuery
.find(queryObj)
.populate('admissionSemester')
.populate({
path: 'academicDepartment',
populate: {
path: 'academicFaculty',
},
});
let sort = '-createdAt'; // By default, sorting will be based on the createdAt field in descending order, meaning the last item will be shown first.
if (query.sort) {
sort = query.sort as string; // if the query object has a sort property, then its value is assigned to the sort variable.
}
const sortedQuery = filteredQuery.sort(sort); // change the variable name to sortedQuery and await is removed from it. so here we are chaining on filteredQuery
let limit = 0; // if no limit is given, all data will be shown
if (query.limit) {
limit = parseInt(query.limit as string); // if limit is given, then its value is assigned to the limit variable. Since the value will be a string, it is converted into an integer.
}
const limitedQuery = await sortedQuery.limit(limit); // method chaining is done on filteredQuery
return limitedQuery;
};
export const StudentServices = {
getAllStudentsFromDB,
};
```
- Let's apply pagination:
```javascript
import { Student } from './student.model';
const getAllStudentsFromDB = async (query: Record<string, unknown>) => { // explained earlier
const queryObj = { ...query }; // copying req.query object so that we can mutate the copy object
let searchTerm = ''; // explained earlier
const studentSearchableFields = ['email', 'name.firstName', 'presentAddress']; // explained earlier
// explained earlier
if (query?.searchTerm) {
searchTerm = query?.searchTerm as string;
}
const searchQuery = Student.find({
$or: studentSearchableFields.map((field) => ({
[field]: { $regex: searchTerm, $options: 'i' },
})),
});
// FILTERING FUNCTIONALITY:
const excludeFields = ['searchTerm', 'sort', 'limit', 'page'];
excludeFields.forEach((el) => delete queryObj[el]); // DELETING THE FIELDS SO THAT IT CAN'T MATCH OR FILTER EXACTLY
// explained earlier
const filteredQuery = searchQuery // change the variable name to filteredQuery and await is removed from it. so here we are chaining on searchQuery
.find(queryObj)
.populate('admissionSemester')
.populate({
path: 'academicDepartment',
populate: {
path: 'academicFaculty',
},
});
let sort = '-createdAt'; // By default, sorting will be based on the createdAt field in descending order, meaning the last item will be shown first.
if (query.sort) {
sort = query.sort as string; // if the query object has a sort property, then its value is assigned to the sort variable.
}
const sortedQuery = filteredQuery.sort(sort); // change the variable name to sortedQuery and await is removed from it. so here we are chaining on filteredQuery
let limit = 0; // if no limit is given, all data will be shown
if (query.limit) {
limit = parseInt(query.limit as string); // if limit is given, then its value is assigned to the limit variable. Since the value will be a string, it is converted into an integer.
}
const limitedQuery = sortedQuery.limit(limit); // change the variable name to limitedQuery and await is removed from it. so here we are chaining on sortedQuery
let page = 1; // if no page number is given, by default, we will go to the first page.
if (query.page) {
page = parseInt(query.page as string); // if the page number is given, then its value is assigned to the page variable. Since the value will be a string, it is converted into an integer.
}
const skip = (page - 1) * limit; // Suppose we are on page 1. To get the next set of documents, we need to skip the first 10 docs if the limit is 10. On page 2, we need to skip the first 20 docs. So the page number is multiplied with the limit.
const paginatedQuery = await limitedQuery.skip(skip); // method chaining is done on limitedQuery
return paginatedQuery;
};
export const StudentServices = {
getAllStudentsFromDB,
};
```
- Finally, we will limit the data field as follows:
```javascript
import { Student } from './student.model';
const getAllStudentsFromDB = async (query: Record<string, unknown>) => { // explained earlier
const queryObj = { ...query }; // copying req.query object so that we can mutate the copy object
let searchTerm = ''; // explained earlier
const studentSearchableFields = ['email', 'name.firstName', 'presentAddress']; // explained earlier
// explained earlier
if (query?.searchTerm) {
searchTerm = query?.searchTerm as string;
}
const searchQuery = Student.find({
$or: studentSearchableFields.map((field) => ({
[field]: { $regex: searchTerm, $options: 'i' },
})),
});
// FILTERING FUNCTIONALITY:
const excludeFields = ['searchTerm', 'sort', 'limit', 'page', 'fields'];
excludeFields.forEach((el) => delete queryObj[el]); // DELETING THE FIELDS SO THAT IT CAN'T MATCH OR FILTER EXACTLY
// explained earlier
const filteredQuery = searchQuery // change the variable name to filteredQuery and await is removed from it. so here we are chaining on searchQuery
.find(queryObj)
.populate('admissionSemester')
.populate({
path: 'academicDepartment',
populate: {
path: 'academicFaculty',
},
});
let sort = '-createdAt'; // By default, sorting will be based on the createdAt field in descending order, meaning the last item will be shown first.
if (query.sort) {
sort = query.sort as string; // if the query object has a sort property, then its value is assigned to the sort variable.
}
const sortedQuery = filteredQuery.sort(sort); // change the variable name to sortedQuery and await is removed from it. so here we are chaining on filteredQuery
let limit = 0; // if no limit is given, all data will be shown
if (query.limit) {
limit = parseInt(query.limit as string); // if limit is given, then its value is assigned to the limit variable. Since the value will be a string, it is converted into an integer.
}
const limitedQuery = sortedQuery.limit(limit); // change the variable name to limitedQuery and await is removed from it. so here we are chaining on sortedQuery
let page = 1; // if no page number is given, by default, we will go to the first page.
if (query.page) {
page = parseInt(query.page as string); // if the page number is given, then its value is assigned to the page variable. Since the value will be a string, it is converted into an integer.
}
const skip = (page - 1) * limit; // Suppose we are on page 1. To get the next set of documents, we need to skip the first 10 docs if the limit is 10. On page 2, we need to skip the first 20 docs. So the page number is multiplied with the limit.
const paginatedQuery = limitedQuery.skip(skip); // change the variable name to paginatedQuery and await is removed from it. so here we are chaining on limitedQuery
let fields = ''; // if no fields are given, by default, all fields will be shown.
if (query.fields) {
fields = query.fields as string; // if the query object has fields, then its value is assigned to the fields variable.
}
const selectedFieldsQuery = await paginatedQuery.select(fields); // method chaining is done on limitedQuery
return selectedFieldsQuery;
};
export const StudentServices = {
getAllStudentsFromDB,
};
```
### Query builder class
- Currently, all the queries apply to the Student model. If we want to apply them to a different model, we would have to rewrite them, which violates the DRY (Don't Repeat Yourself) principle. To avoid repetition, we can create a class where all the queries are available as methods. This way, whenever we need to apply these queries to a new collection, we can simply create a new instance of that class. This approach will enhance scalability and maintainability and make the codebase cleaner.
```javascript
import { FilterQuery, Query } from 'mongoose'; // Import FilterQuery and Query types from mongoose.
class QueryBuilder<T> { // Declare a class that will take a generic type
public modelQuery: Query<T[], T>; // Property for model. The query is run on a model, so we named it modelQuery. You can name it anything else. After the query, we receive an array or object, so its type is set as an object or an array of objects.
public query: Record<string, unknown>; // The query that will be sent from the frontend. We do not know what the type of query will be, so we kept its property as a string and its value as unknown.
// Define the constructor
constructor(modelQuery: Query<T[], T>, query: Record<string, unknown>) {
this.modelQuery = modelQuery;
this.query = query;
}
search(searchableFields: string[]) { // Method for the search query, taking searchableFields array as a parameter.
const searchTerm = this?.query?.searchTerm; // Take the search term from the query using this.
if (searchTerm) { // If search term is available in the query, access the model using this.modelQuery and perform the search operation.
this.modelQuery = this.modelQuery.find({
$or: searchableFields.map(
(field) =>
({
[field]: { $regex: searchTerm, $options: 'i' },
}) as FilterQuery<T>,
),
});
}
return this; // Return this for method chaining in later methods.
}
filter() { // Method for filter query without any parameter. The query is performed on this.modelQuery using method chaining and then returns this.
const queryObj = { ...this.query }; // Copy the query object
// Filtering
const excludeFields = ['searchTerm', 'sort', 'limit', 'page', 'fields'];
excludeFields.forEach((el) => delete queryObj[el]);
this.modelQuery = this.modelQuery.find(queryObj as FilterQuery<T>);
return this;
}
sort() { // Method for sort query without any parameter. The query is performed on this.modelQuery using method chaining and then returns this. Also, the sort variable is adjusted so now sorting can be done based on multiple fields.
const sort = (this?.query?.sort as string)?.split(',')?.join(' ') || '-createdAt';
this.modelQuery = this.modelQuery.sort(sort as string);
return this;
}
paginate() { // Method for paginate query without any parameter. The query is performed on this.modelQuery using method chaining and then returns this.
const page = Number(this?.query?.page) || 1;
const limit = Number(this?.query?.limit) || 10;
const skip = (page - 1) * limit;
this.modelQuery = this.modelQuery.skip(skip).limit(limit);
return this;
}
fields() { // Method for fields query without any parameter. The query is performed on this.modelQuery using method chaining and then returns this.
const fields = (this?.query?.fields as string)?.split(',')?.join(' ') || '-__v';
this.modelQuery = this.modelQuery.select(fields);
return this;
}
}
export default QueryBuilder;
```
- How can we apply the QueryBuilder to any model? We will see an example for the Student model, but in the same way, it can be applied to any model.
```javascript
import QueryBuilder from '../../builder/QueryBuilder';
import { studentSearchableFields } from './student.constant'; // Import studentSearchableFields from a separate file.
const getAllStudentsFromDB = async (query: Record<string, unknown>) => {
const studentQuery = new QueryBuilder( // Create a new instance of the QueryBuilder class.
Student.find() // This will act as a modelQuery inside the class.
.populate('admissionSemester')
.populate({
path: 'academicDepartment',
populate: {
path: 'academicFaculty',
},
}),
query, // This will act as a query inside the class.
)
.search(studentSearchableFields) // Method chaining on studentQuery.
.filter() // Method chaining on studentQuery.
.sort() // Method chaining on studentQuery.
.paginate() // Method chaining on studentQuery.
.fields(); // Method chaining on studentQuery.
const result = await studentQuery.modelQuery; // Perform the final asynchronous operation on studentQuery.
return result;
};
export const StudentServices = {
getAllStudentsFromDB,
};
```
### Conclusion
This comprehensive code snippet handles search, filtering, sorting, pagination, and field selection in a MongoDB query using Mongoose. It processes the incoming query object and constructs a MongoDB query with appropriate modifications and chaining of methods for each operation. | md_enayeturrahman_2560e3 | |
1,894,058 | Tutorial: Deployment of Golang web app using Systemd | Today, I am going to show you a simple way of deploying a Golang web application. We are going to use... | 0 | 2024-06-19T20:29:48 | https://blog.gkomninos.com/tutorial-deployment-of-golang-web-app-using-systemd | golanguage, tutorial, golangwebdevelopment | ---
title: Tutorial: Deployment of Golang web app using Systemd
published: true
date: 2024-06-16 05:00:20 UTC
tags: GoLanguage,Tutorial,Golangwebdevelopment
canonical_url: https://blog.gkomninos.com/tutorial-deployment-of-golang-web-app-using-systemd
---
Today, I am going to show you a simple way of deploying a Golang web application. We are going to use Systemd and a Makefile to deploy the code when we merge to main branch. In a future blog post we will revisit and show you how you can deploywhen yo... | gosom |
1,890,024 | The Power of Embeddings in AI | Introduction Embeddings have become a cornerstone in natural language processing (NLP)... | 27,673 | 2024-06-16T04:53:48 | https://dev.to/rapidinnovation/the-power-of-embeddings-in-ai-6d9 | ## Introduction
Embeddings have become a cornerstone in natural language processing (NLP) and
machine learning. They transform words, phrases, or documents into vectors of
real numbers, allowing algorithms to effectively interpret and process natural
language data.
## What are Embeddings?
Embeddings are low-dimensional, continuous vector spaces where similar data
points are mapped close to each other. This concept is particularly useful in
NLP and computer vision.
## Types of Embeddings
There are several types of embeddings, each designed for specific
applications:
## Storage of Embeddings
Efficient storage of embeddings is crucial for performance and scalability.
Options include on-disk storage, in-memory storage, and cloud storage
solutions.
## Applications of Embeddings
Embeddings are widely used in various applications:
## Embeddings in Large Language Models (LLMs)
In LLMs like GPT-3 or BERT, embeddings play a crucial role in understanding
and generating human-like text. They capture the context and semantic meanings
within a large corpus of text.
## Benefits of Using Embeddings
Embeddings offer numerous benefits, including improved model performance,
efficiency in handling large datasets, and versatility across different
applications.
## Challenges with Embeddings
Challenges include managing dimensionality, storage and computational costs,
and addressing bias and fairness concerns.
## Future of Embeddings
The future of embeddings looks promising with continuous advancements in
technology and growing applications across various fields.
## Real-World Examples
Examples include the use of Word2Vec in e-commerce for personalized
recommendations and graph embeddings in social network analysis.
## Conclusion
Embeddings are a pivotal component in modern AI applications, enhancing the
intelligence and applicability of AI systems across different sectors.
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| rapidinnovation | |
1,890,022 | Smart Contract Fork Testing Using Foundry Cheatcodes | Introduction Testing is important in smart contract development due to the immutable... | 0 | 2024-06-16T04:42:16 | https://dev.to/eyitayoitalt/smart-contract-fork-testing-using-foundry-cheatcodes-4jgd |
## Introduction
Testing is important in smart contract development due to the immutable nature of smart contracts. Testing helps identify and resolve potential security vulnerabilities in smart contracts. Safeguard against unauthorized access.
Sometimes smart contract developers must interact with real-world data that testnet cannot provide. Hence, there is a need for fork testing. In this article, readers will learn how to conduct fork-testing in a foundry development environment.
## Content
1. Introduction
2. Prerequisites
3. Benefits of fork testing?
4. What are Foundry Cheatcodes?
5. Project Setup and Testing
6. Conclusion.
## Prerequisites
This tutorial requires foundry installation.
Knowledge of Solidity programming and smart contract development.
## Benefits of fork-testing
Fork testing mimics the production environment as much as possible. There is no need to use a testnet public faucet to get test coins for testing.
- It allows developers to debug in an environment that is as close to the production as possible.
- It gives developers access to real-time data such as the current state of the blockchain which testnet cannot provide since testnet operates in an isolated environment.
- It gives developers unprecedented control over smart contracts. Developers can mint or transfer tokens like they own the token creation smart contract.
- Developers can create blockchain addresses easily.
## What are Foundry Cheatcodes?
According to Foundry Documentation, Forking cheatcodes allow developers to fork blockchain programmatically using solidity instead of CLI arguments. Forking cheat codes support multiple forks and each fork has a unique `uint256` identifier. The developer must assign a unique identifier when the developer creates the fork. Forking cheatcodes execute each test in its own standalone `EVM`. Forking cheatcodes isolate tests from one another, and execute tests after the setUp function. It implies that a test in forking cheatcodes mode must have a setup function.
## Project setup and testing
To demonstrate fork testing, we will create a savings smart contract. The contract will allow users to save, set a deadline for withdrawal, and allows users to withdraw when the deadline has elapsed.
Open a CLI terminal and run the command below to scaffold a foundry project. Name the project `fork_testing`.
`forge init fork_testing`.
Navigate to the src folder create a file and name it `Savings.sol`.
Open the `Savings.sol` file and create a Savings contract as shown below.
```solidity
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.13;
contract Savings {
}
```
Create the under-listed variables and an event in the contract as shown below.
```solidity
event Saver(address payer, uint256 amount);
mapping(address => uint256) public balances;
mapping(address => uint256) public tenor;
bool public openForWithdraw = false;
uint256 public contractBalance = address(this).balance;
```
The variable `tenor` maps the address of the saver to the duration in seconds the user wants to keep his token. The variable balance maps the address of a saver to the amount saved in the contract. The boolean variable `openForWithdraw` is set to false and does not allow the saver to withdraw before the tenor lapses. The contract will emit the Saver event when a user transfers or sends funds to the contract.
Next, add a `receive () payable` function that allows the contract to receive funds. The function will require the user to set a tenor before the user can send funds to the contract. The function will use the map balances to keep track of the funds sent by an address. On successful savings, the function emits the address and amount sent by a user. The `receive()` is as shown in the code below.
```solidity
receive() external payable {
require(tenor[msg.sender] > 0, "You must set a tenor before saving");
balances[msg.sender] += msg.value;
contractBalance = address(this).balance;
emit Saver(msg.sender, msg.value);
}
```
Next add two functions to the contract, a `setTenor()` and a `getTenor()` view function. The `setTenor()` allows the user to set the duration the user wants to keep the funds and `getTenor()` retrieves the duration the user wants to keep the funds in the contract. The implementation of the functions is shown below.
```solidity
function setTenor(address saver, uint256 _tenor) public {
tenor[saver] = block.timestamp + _tenor;
}
function getTenor(address saver) public view returns (uint256) {
return tenor[saver];
}
```
Add a get balance() as shown below. The function returns the total funds received by the contract.
```solidity
function getBalance() public view returns (uint256) {
return address(this).balance;
}
```
Next, add a view function `getIndividualBalance()` as shown below. The `getIndividualBalance()` returns the balance of the individual address.
```solidity
function getIndividualBalances(
address saver
) public view returns (uint256) {
return balances[saver];
}
```
Add a `timeLeft()` view function that returns the time left before the tenor lapses. The implementation is shown below.
```solidity
function timeLeft(address saver) public view returns (uint256) {
if (block.timestamp >= tenor[saver]) {
return 0;
} else {
return tenor[saver] - block.timestamp;
}
}
```
Lastly add a withdraw function, that allows the user to withdraw their funds if the tenor has elapsed. The implementation is shown below.
```solidity
function withdraw(uint amount, address withdrawer) public {
if (timeLeft(withdrawer) <= 0) {
openForWithdraw = true;
}
require(openForWithdraw, "It is not yet time to withdraw");
require(
balances[withdrawer] >= amount,
"Balance less than amount to withdraw"
);
balances[withdrawer] -= amount;
(bool success, ) = withdrawer.call{value: amount}("");
require(success, "Unable to withdraw fund");
}
```
Below is the full code implementation of the `Savings` contract.
```solidity
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.13;
contract Savings {
event Saver(address payer, uint256 amount);
mapping(address => uint256) public balances;
mapping(address => uint256) public tenor;
bool public openForWithdraw = false;
uint256 public contractBalance = address(this).balance;
// Collect funds in a payable `receive()` function and track individual `balances` with a mapping:
// Add a `Saver(address,uint256, uint256, uint256)`
receive() external payable {
require(tenor[msg.sender] > 0, "You must set a tenor before saving");
balances[msg.sender] += msg.value;
contractBalance = address(this).balance;
emit Saver(msg.sender, msg.value);
}
// Set the duration of time a user will save token in the contract.
function setTenor(address saver, uint256 _tenor) public {
tenor[saver] = block.timestamp + _tenor;
}
// Returns the duration of time a user is willing save funds in the contract.
function getTenor(address saver) public view returns (uint256) {
return tenor[saver];
}
// Returns the contract balance.
function getBalance() public view returns (uint256) {
return address(this).balance;
}
// Returns the balance saved in the contact by an address.
function getIndividualBalances(
address saver
) public view returns (uint256) {
return balances[saver];
}
// Returns the time left before the tenor elapsed.
function timeLeft(address saver) public view returns (uint256) {
if (block.timestamp >= tenor[saver]) {
return 0;
} else {
return tenor[saver] - block.timestamp;
}
}
// Allows a user to withraw funds once the tenor has elapsed.
function withdraw(uint amount, address withdrawer) public {
if (timeLeft(withdrawer) <= 0) {
openForWithdraw = true;
}
require(openForWithdraw, "It is not yet time to withdraw");
require(
balances[withdrawer] >= amount,
"Balance less than amount to withdraw"
);
balances[withdrawer] -= amount;
(bool success, ) = withdrawer.call{value: amount}("");
require(success, "Unable to withdraw fund");
}
}
```
### Testing the Savings contract.
Open the test folder, create a `.env` file, and add a variable `MAINET_RPC_URL`. Copy and paste your mainnet RPC_URL as value as shown below.
` MAINET_RPC_URL = ‘https://your_rpc_url’ `
Next, create a `Savings.t.sol` file. Open the file and specify the license and solidity compiler version. In the file, import the foundry Forge Standard Library, the `Savings` contract and forge standard output as shown below. Forge Standard Library is a collection of contracts that makes Test contracts easy to write and test. The `forge-std/Test.sol` contains the forge standard experience.
```solidity
// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.13;
//import dependencies
import "forge-std/Test.sol";
import "../src/Savings.sol";
import "forge-std/console.sol";
```
Add a test contract to the Savings.t.sol file. Let the test contract inherit from the `Test.sol`.
```solidity
contract TestSavings is Test {
}
```
Add the variables listed below to the contract.
```solidity
uint256 mainnetFork;
string MAINNET_RPC_URL = vm.envString("MAINNET_RPC_URL");
Savings public savings;
```
The variable `mainnetFork` will hold the fork's unique identifier, and the string `MAINNET_RPC_URL ` holds the RPC_URL loaded from the .env file using cheatcode`vm.envString(). The vm is an instance of `forge `cheatcodes.`
Next, add `receive() external payable{}` to allow the test contract to receive funds. Add a `setUp` function to the contract, to create, select the mainnet fork and create an instance of the `Savings` contract as shown below.
```solidity
function setUp() public {
mainnetFork = vm.createFork(MAINNET_RPC_URL);
vm.selectFork(mainnetFork);
savings = new Savings();
}
```
In the code above, we used the cheatcodes `vm.createFork(MAINNET_RPC_URL)` to fork the Ethereum mainnet blockchain and create a unique uint256 identifier which we assigned to the variable `mainnetFork`. Next, we select the fork with `vm.selectFork(mainnetFork)`.
Since forge cheatcodes isolate tests from one another, we will create six test functions listed below.
- `function testInitialBalance() public view {}`: To test if the Savings contract initial balance is zero.
- `function testSavingsWithoutTenor() public{}`: To test if a user can send funds to the Savings contract without a tenor. The test should revert if a user did not set a tenor before sending funds to the Savings contract.
- `function testSetTenor() public {}`: The test expects the tenor to be greater than the current `block.timestamp`.
- `function testSavings() public{}`: Once, the user sets a tenor, the test expects the user to be able to save.
- `function testWithdrawBeforeTime() public {}`: The user should not be able to withdraw funds before the tenor elapses.
- `function testWithdrawAfterTime() public {}`: The user should be able to withdraw funds after the tenor elapses.
The full code implementation of the test contract is shown below.
```solidity
// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.13;
//import dependencies
import "forge-std/Test.sol";
import "../src/Savings.sol";
import "forge-std/console.sol";
//Test Contract
contract TestSavings is Test {
uint256 mainnetFork;
string MAINNET_RPC_URL = vm.envString("MAINNET_RPC_URL");
Savings public savings;
// Allow the test contract to receive funds.
receive() external payable {}
// Initial configuration.
function setUp() public {
mainnetFork = vm.createFork(MAINNET_RPC_URL);
vm.selectFork(mainnetFork);
savings = new Savings();
}
// The initial balance should be 0.
function testInitialBalance() public view {
assertLt(savings.getBalance(), 1);
}
// User should not be able to save without setting a tenor.
function testSavingsWithoutTenor() public {
vm.deal(address(this), 2 ether);
vm.expectRevert();
(bool sent, ) = address(savings).call{value: 1 ether}("");
require(sent, "Failed to send Ether");
}
// User should be able to set tenor.
function testSetTenor() public {
savings.setTenor(address(this), 30);
uint tenor = savings.getTenor(address(this));
assertGt(tenor, block.timestamp);
}
// User should be able to save, if the user has set a tenor.
function testSavings() public {
savings.setTenor(address(this), 30);
vm.deal(address(this), 2 ether);
(bool sent, ) = address(savings).call{value: 1 ether}("");
require(sent, "Failed to send Ether");
assertGt(savings.getIndividualBalances(address(this)), 0);
}
// User should not be able to with the tenor elapses.
function testWithdrawBeforeTime() public {
savings.setTenor(address(this), 30);
vm.deal(address(this), 2 ether);
(bool sent, ) = address(savings).call{value: 1 ether}("");
console.log(sent);
vm.expectRevert("It is not yet time to withdraw");
savings.withdraw(0.5 ether, address(this));
}
// User should be able to withdraw after the tenor elapses.
function testWithdrawAfterTime() public {
savings.setTenor(address(this), 0);
vm.deal(address(this), 1 ether);
(bool sent, ) = address(savings).call{value: 1 ether}("");
console.log(sent);
uint256 oldBalance = address(this).balance;
savings.withdraw(0.5 ether, address(this));
uint256 newBalance = address(this).balance;
assertGt(newBalance, oldBalance);
}
}
```
In the `testBalance()` , we use the `assertLt()` to check if the contract balance is less than 1. The test should pass.
The `testSavingsWithoutTenor()` test if a user can save without setting a tenor. In the function, we retrieve the balance of the Savings contract with `savings.getBalance()` and assign the return value to the variable initial balance. Then we set the balance of the test contract to `2 ether` using `vm.deal()`. We expect that when a user tries to send funds to the Savings contract without a tenor, the transaction should revert. We use `vm.expectRevert()` to handle the revert. Then, we send `1 ether` to the Savings contract from the test contract using ` (bool sent, ) = address(savings).call{value: 1 ether}("")`. Next, we retrieve the balance of the Savings contract and assign the return value to the variable `newBalance`. Then, we test if the new balance of the savings contract is equal to the initial balance using `assertEq()`. We expect the test to pass.
The function `testSetTenor` tests if a user can set the tenor for funds to be stored in the savings contract. We set the tenor using `setTenor()` of the Savings contract with the address of the test contract and the duration of 30 seconds. The test expects the tenor should be greater than the current `block.timestamp`.
The `testSavingsWithTenor()` tests if a user can save after the user sets a tenor. We set the tenor with the `savings.setTenor` to 30 seconds, set the balance of the test contract to `2 ether`, then transfer `1 ether` to the `Savings` contract. We retrieve the balance mapped to the test contract address in the `Savings` contract with the `getIndividualBalances` function. We expect the retrieved balance to be greater than 0.
The `testWithdrawBeforeTime()` tests if a user can withdraw funds before the tenor elapses. We send `1 ether` to the savings contract, then try to withdraw `0.5 ether` from the `Savings` contract to the test contract with `savings.withdraw(0.5 ether, address(this))`. We expect the transaction to revert.
The `testWithdrawAfterTime()` tests if a user can withdraw after the tenor has elapsed. We set the tenor to `0 seconds`, retrieve the balance of the test contract and assign it to the variable oldBalance, then transfer `1 ether` to the `Savings` contract, and withdraw `0.5 ether` from the `Savings` contract. Thereafter, retrieve the balance of the test contract and assign the value to the variable newBalance. We expect that the newBalance should be greater than the oldBalance.
Run the tests with the command:
`forge test`
For trace result, run the command:
`forge test -vvv`
Or
`forge test -vvvv`
## Conclusion
Testing is essential in smart contract development, it enables developers to discover errors, and security vulnerabilities in smart contracts before deployment. Once we deploy a smart contract, it becomes immutable. Fork testing is a way to test smart contracts in an environment that is as close to the production environment as possible. In this article, we have demonstrated how to carry out fork testing using Foundry cheatcodes. We have demonstrated how it is easy to fork an Ethereum mainnet and transfer `ether` from one contract to another without the need to use testnet faucet or tokens.
Like, Share, or Comment if you find this article interesting. | eyitayoitalt | |
1,890,014 | Egg Carton Supplier Fueling the Poultry Business | Introduction Egg carton are especially important for the poultry industry, as they are used to... | 0 | 2024-06-16T04:13:04 | https://dev.to/ritik_poultry_10a5f2f0a6b/egg-carton-supplier-fueling-the-poultry-business-3pl2 | eggcartons, cardboardeggcartons, ai | Introduction
Egg carton are especially important for the poultry industry, as they are used to safely and efficiently transfer eggs from farms to consumers. Among a host of different varieties of [egg cartons](https://poultrycartons.com/eggcartons/), the cardboard egg cartons find special mention for being eco-friendly and the most functional ones. Poultry Cartons is the premium egg carton company that prioritizes sustainable and dependable packages.
The Evolution of Egg Cartons
Early Beginnings
Whilst this I am unsure if this any indication of colour but after all, with - the concept of the egg carton was born in the early 20th century as eggs were typically transported in baskets and resulted in high breakage in transport.
Modern Developments
Egg cartons today are made of a range of materials, including plastic, foam, and cardboard. While each type has its pros, cardboard egg cartons are the most popular for many reasons, two of them being their friendly nature for the environment and their versatility.
Cardboard Egg Cartons: An Earth Friendly Option
Environmental Benefits
Cardboard egg cartons : These are made of recycled paper and are biodegradable, hence an eco-friendly Drinking straws option. Because cardboard cartons biodegrade on their own cardboard, cartons leave less of an environmental footprint than plastic or foam cartons, which contribute to pollution and landfill waste.
Protection and Functionality
Although lightweight, cardboard egg cartons keep eggs safe! Designed to have individual compartments that cradle each egg, most are molded in such a way that prevents them from knocking against each other - and from cracking - on the way home.
The Future of Egg Cartons
With the growth of consumer consciousness about the environment, the need for eco-friendly packaging is projected to accelerate. Fortunately a company like Poultry Cartons is a step in the right direction, laying and egg shaped box is an excellent solution replacing the traditional plastic, non-degradable box. Future improvements in materials and product design are likely to have further impact on the economy and environmental footprint of egg cartons.
Conclusion
An egg carton is a carton designed for carrying and transporting whole eggs. Cardboard [egg cartons](https://poultrycartons.com/eggcartons/) are the best from an environmental and practical viewpoint. Poultry Cartons is dedicated to quality and sustainable packaging and is proud to have a variety of available products that will fit any poultry producers needs. | ritik_poultry_10a5f2f0a6b |
1,890,020 | What is a Computer Programming Language? | This is a submission for DEV Computer Science Challenge v24.06.12: One Byte Explainer. ... | 0 | 2024-06-16T04:33:10 | https://dev.to/dinesh_d/what-is-a-computer-programming-language-2im1 | devchallenge, cschallenge, computerscience, beginners | *This is a submission for [DEV Computer Science Challenge v24.06.12: One Byte Explainer](https://dev.to/challenges/cs).*
## Explainer
A set of instructions which translate human logic into machine-readable code to produce various kinds of output and enable developers to write programs that perform specific tasks or solve problems is Called a Computer Programmig Language.
## Additional Context
--
<!-- Please share any additional context you think the judges should take into consideration as it relates to your One Byte Explainer. -->
<!-- Team Submissions: Please pick one member to publish the submission and credit teammates by listing their DEV usernames directly in the body of the post. -->
<!-- Don't forget to add a cover image to your post (if you want). -->
<!-- Thanks for participating! --> | dinesh_d |
1,890,019 | AWS Global Infrastructure: The Backbone of Modern Cloud Computing | Key Components of AWS Global Infrastructure AWS Regions AWS divides its global operations into... | 0 | 2024-06-16T04:33:07 | https://dev.to/safi-ullah/aws-global-infrastructure-the-backbone-of-modern-cloud-computing-111m | aws, infrastructure, cloud | Key Components of AWS Global Infrastructure
1. AWS Regions
AWS divides its global operations into geographical regions. Each region is a separate geographic area, and every region consists of multiple, isolated locations known as Availability Zones (AZs). As of 2024, AWS has 31 regions worldwide, with several more announced or under development.
2. Availability Zones
An Availability Zone is one or more discrete data centers with redundant power, networking, and connectivity housed in separate facilities. Each region contains multiple AZs, allowing customers to design resilient and fault-tolerant applications. By deploying applications across multiple AZs, businesses can achieve high availability and disaster recovery.
3. Edge Locations
Edge locations are part of AWS’s content delivery network (CDN) known as Amazon CloudFront. They cache copies of your data closer to users, reducing latency and improving performance for content delivery. AWS has over 400 edge locations globally, ensuring fast content delivery to users regardless of their location.
4. Local Zones
AWS Local Zones are extensions of AWS regions that place compute, storage, database, and other select AWS services closer to large population and industry centers. This reduces latency and improves performance for applications that require single-digit millisecond latencies. Local Zones are particularly beneficial for real-time gaming, live video streaming, and machine learning.
5. Wavelength Zones
AWS Wavelength Zones embed AWS compute and storage services within telecommunications providers’ data centers at the edge of the 5G network. This allows developers to build applications that require ultra-low latency, such as IoT devices, machine learning inference at the edge, and augmented reality.
Benefits of AWS Global Infrastructure
1. High Availability and Fault Tolerance
AWS's infrastructure is designed for high availability. By using multiple AZs within a region, businesses can ensure their applications remain available even if one AZ fails. Regions are also isolated from one another, providing an additional layer of fault tolerance.
2. Global Reach
With regions and edge locations spread across the globe, AWS provides businesses with a global footprint. This extensive reach enables companies to serve their customers with low latency and high performance, no matter where they are located.
3. Scalability and Flexibility
AWS infrastructure allows businesses to scale their applications seamlessly. Whether you need to scale up for a global event or down during off-peak times, AWS provides the flexibility to adjust your resources according to your needs.
4. Security and Compliance
AWS places a strong emphasis on security. Each AWS region and AZ is built to the highest security standards, with multiple layers of physical and network security. AWS also complies with numerous global regulatory standards and certifications, making it a trusted platform for industries with stringent compliance requirements.
5. Performance Optimization
The global infrastructure is optimized for performance. By strategically placing data centers and edge locations, AWS minimizes latency and maximizes throughput. Services like AWS Direct Connect provide dedicated network connections to AWS, further enhancing performance for critical applications.
Innovations and Continuous Expansion
AWS continuously innovates and expands its infrastructure to meet the growing demands of its customers. Recent developments include new regions in strategic locations, additional edge locations to improve content delivery, and specialized infrastructure such as Local Zones and Wavelength Zones to cater to emerging technological needs.
New Regions and AZs
AWS frequently announces new regions and AZs to expand its global presence. These additions provide more options for data residency and disaster recovery planning, allowing customers to deploy their applications closer to their user base.
Green Energy Initiatives
AWS is committed to sustainability and aims to power its global infrastructure with 100% renewable energy by 2025. AWS has already made significant investments in solar and wind projects around the world, reducing the carbon footprint of its operations.
Conclusion
The AWS global infrastructure is a cornerstone of its cloud services, providing the foundation for high availability, scalability, and security. By leveraging a vast network of regions, availability zones, edge locations, local zones, and wavelength zones, AWS ensures that businesses can deliver high-performance applications to users worldwide. As AWS continues to innovate and expand, its global infrastructure will remain a critical asset for organizations looking to harness the power of cloud computing.
| safi-ullah |
1,890,017 | Binary Tree | This is a submission for DEV Computer Science Challenge v24.06.12: One Byte Explainer. ... | 0 | 2024-06-16T04:18:26 | https://dev.to/dinesh_d/binary-tree-50ic | devchallenge, cschallenge, computerscience, beginners | *This is a submission for [DEV Computer Science Challenge v24.06.12: One Byte Explainer](https://dev.to/challenges/cs).*
## Explainer
A binary tree is a tree data structure in which each node has at most two children, referred to as the left child and the right child. It is used for efficient searching, sorting, and hierarchical data organization.
## Additional Context
--
<!-- Please share any additional context you think the judges should take into consideration as it relates to your One Byte Explainer. -->
<!-- Team Submissions: Please pick one member to publish the submission and credit teammates by listing their DEV usernames directly in the body of the post. -->
<!-- Don't forget to add a cover image to your post (if you want). -->
<!-- Thanks for participating! --> | dinesh_d |
1,890,016 | Understanding AWS Identity and Access Management (IAM) | This article explores the key features, benefits, and best practices of AWS IAM, illustrating how it... | 0 | 2024-06-16T04:17:40 | https://dev.to/safi-ullah/understanding-aws-identity-and-access-management-iam-4aab | aws, iam, cloud, awscloud | This article explores the key features, benefits, and best practices of AWS IAM, illustrating how it can help organizations manage their AWS environments securely and efficiently.
What is AWS IAM?
AWS Identity and Access Management (IAM) is a web service that enables you to manage access to AWS services and resources securely. With IAM, you can create and manage AWS users and groups and use permissions to allow or deny their access to AWS resources. IAM helps you manage identities (users, groups, roles, and policies) and provides fine-grained access control.
Key Features of AWS IAM
1. User Management
IAM allows you to create individual user accounts for people within your organization. Each user gets unique security credentials, which they can use to interact with AWS resources.
2. Groups
You can create groups in IAM and add users to these groups. This allows you to assign permissions to a group rather than to each individual user, simplifying permission management.
3. Roles
IAM roles provide a way to delegate access with temporary credentials. Roles can be assumed by users, applications, or services that need to perform actions on AWS resources.
4. Policies
Policies are JSON documents that define permissions. They specify what actions are allowed or denied for which resources. You attach policies to users, groups, or roles to define their permissions.
5. Multi-Factor Authentication (MFA)
MFA adds an extra layer of security by requiring users to provide a second form of authentication in addition to their password.
6. Federated Access
IAM supports federated access, allowing users to access AWS resources using existing corporate credentials or through identity providers.
Benefits of AWS IAM
1. Enhanced Security
IAM helps ensure that the right people have the appropriate access to your resources, reducing the risk of unauthorized access and potential security breaches.
2. Granular Control
With IAM policies, you can specify detailed permissions, providing precise control over who can access what resources and what actions they can perform.
3. Scalability
IAM scales with your AWS environment, allowing you to manage access for a growing number of users and resources without sacrificing control or security.
4. Centralized Management
IAM provides a centralized way to manage user access across all AWS services, simplifying administrative tasks and enhancing oversight.
5. Compliance and Auditing
IAM helps meet compliance requirements by providing detailed logs and auditing capabilities, ensuring that access is monitored and can be reviewed.
Best Practices for Using AWS IAM
1. Least Privilege Principle
Always follow the principle of least privilege, granting users only the permissions they need to perform their tasks.
2. Use Groups for Permissions
Assign permissions to groups rather than individual users to simplify management and ensure consistency.
3. Enable MFA
Enable MFA for all users, especially for users with privileged access, to add an extra layer of security.
4. Regularly Review IAM Policies
Regularly review and update IAM policies to ensure they reflect the current needs and security posture of your organization.
5. Use Roles for Applications and Services
Use IAM roles instead of storing credentials in applications. This enhances security by leveraging temporary credentials.
6. Monitor and Audit IAM Activity
Utilize AWS CloudTrail to monitor and log IAM activity. Regularly review these logs to detect and respond to suspicious activities.
Conclusion
AWS Identity and Access Management (IAM) is a critical service for managing access to your AWS resources securely and efficiently. By leveraging IAM's robust features and following best practices, organizations can ensure that their cloud environment is secure and that access to resources is appropriately controlled. IAM's ability to provide fine-grained permissions, support for multi-factor authentication, and integration with existing identity systems makes it an essential tool for any organization using AWS. | safi-ullah |
1,889,986 | Explain X Like I'm Five | A post by Ahmad Rifai | 0 | 2024-06-16T03:18:00 | https://dev.to/ahmad_rifai_54a20be09025e/explain-x-like-im-five-n8j | explainlikeimfive | ahmad_rifai_54a20be09025e | |
1,890,012 | Dead lock due to Circular Wait | This is a submission for DEV Computer Science Challenge v24.06.12: One Byte Explainer. ... | 0 | 2024-06-16T04:10:44 | https://dev.to/dinesh_d/dead-lock-due-to-circular-wait-4okf | devchallenge, cschallenge, computerscience, beginners | *This is a submission for [DEV Computer Science Challenge v24.06.12: One Byte Explainer](https://dev.to/challenges/cs).*
## Explainer
If resource A is waiting for B and Resource B is waiting for C and now If C is waiting for A then it creates a Circular Wait which is one of the Coffman conditions Leading to a Dead Lock in a System
## Additional Context
<!-- Please share any additional context you think the judges should take into consideration as it relates to your One Byte Explainer. -->
<!-- Team Submissions: Please pick one member to publish the submission and credit teammates by listing their DEV usernames directly in the body of the post. -->
<!-- Don't forget to add a cover image to your post (if you want). -->
<!-- Thanks for participating! --> | dinesh_d |
1,890,011 | The Evolution and Impact of Egg Cartons: Poultry cartons as a sector have been targeted closely | In the earlier part of the 20th century, the idea of using the egg carton was first introduced. A... | 0 | 2024-06-16T04:10:03 | https://dev.to/ritik_poultry_10a5f2f0a6b/the-evolution-and-impact-of-egg-cartons-poultry-cartons-as-a-sector-have-been-targeted-closely-182o | eggcartons, cardboardeggcartons | In the earlier part of the 20th century, the idea of using the [egg carton ](https://poultrycartons.com/eggcartons/)was first introduced. A major challenge to eggs in the past was in transporting them, as breaking news meant that many of the eggs would be broken. Newspaper editor from Canada named Joseph Coyle is widely attributed as the first person to invent egg cartons in 1911 with specific goal of settling the tug of war between a farmer and a hotel owner with a disagreement over broken eggs. His design of packaging only one egg per compartment helped to reduce the probability of eggs being broken significantly.
With the decades it has progressed where egg cartons undergo some changes of their designs and materials, which use from the classic cardboard and up to the modern plastic and foam. But the orography simplified as a cardboard has continued to enjoy popularity because of its renewable nature and the protective shield it offers.
Poultry Cartons: Green packaging: carving a niche out of sustainability
Poultry Cartons has positioned itself as a leader in the egg packaging trade and is involved in the production of top quality cardboard egg cartons. Hence, the company has the edge working for it as it has embraced sustainability, innovation, and customer satisfaction as its main strategic policies than any of its competitors can offer.
Sustainable Practices: At Poultry Cartons, an important strategy everybody is aiming at is sustainability, or let us call it a way of life. This aspect entails that the raw materials that are used by the company are properly acquired, even the cardboard used for packaging is acquired from recycled material. This practice leads to minimizing the polluting impact on the environment and encourages the circular economy model.
Innovative Design: Poultry Cartons invest a lot of resources in innovation as they strive to enhance the usability and appearance of carts Poultry Cartons hence enhance the usability of carts. The latest developments were compensated improvements on shock absorption, client’s logo imprinting and ergonomics for improved grip.
Customer Focus: This way, being aware of the requirements of its clients, Poultry Cartons provides varied packaging services covering the exemplary egg sizes and quantities. The primary advantage of using the company’s products and services is the capacity to adapt to meeting the necessary market needs of meat production farms for poultry, as well as groceries and supermarkets.
In conclusion, the egg carton is a packaging material that has a significant future as it can be used in a variety of ways and its environmental impact is still presentable.
With the increase in consciousness for sustainability regarding packing requirements it can be predicted that there will be a steady increase in the demand for more sustainable and environmentally sound cardboard egg cartons. Poultry Cartons is ready to be at the wehead of this change, always be ready to work in line with market trends as well as the consumers. | ritik_poultry_10a5f2f0a6b |
1,890,007 | Feribet | Feribet Gestunbet Tomorobet Gestunbet Tomorobet Feribet | 0 | 2024-06-16T03:46:53 | https://dev.to/lpo_delapan8_f9d327a16711/feribet-2goh |
[Feribet](http://66.29.135.198/)
[Gestunbet](http://198.177.123.144/)
[Tomorobet](http://199.192.20.135/)
[Gestunbet](http://162.0.213.230/)
[Tomorobet](http://162.0.237.32)
[Feribet](http://198.54.112.150/) | lpo_delapan8_f9d327a16711 | |
1,890,006 | lpo888b | LPO88 | 0 | 2024-06-16T03:45:53 | https://dev.to/lpo_delapan8_f9d327a16711/lpo888b-1jn9 | [LPO88](http://198.177.123.144/) | lpo_delapan8_f9d327a16711 | |
1,890,004 | 3D Glowing Card Carousel Slider | Creating visually appealing and interactive user interfaces is very important in this huge and... | 0 | 2024-06-16T03:36:40 | https://dev.to/divinector/3d-glowing-card-carousel-slider-4io | frontend, webdev, html, javascript | Creating visually appealing and interactive user interfaces is very important in this huge and competitive field of web development. One such attractive and interactive user interface is the 3D Glowing Card Carousel Slider. Today we will design a 3D card carousel slider using CSS animations and a UI component library called Materialize CSS. A glowing effect is also added to the cards through CSS animations. The video tutorial below shows the step-by-step process including styling, plugin implementation, initialization, etc.
{% embed https://www.youtube.com/watch?v=68OwDDU2ol8 %}
Nowadays many types of websites are using this 3D card carousel slider. If you visit e-commerce websites, you will find that they are displaying their popular and new arrival products to the users through this type of carousel slider. Also, they have a dedicated slider for specific brands, promotional deals, etc. If you visit portfolio websites, you will see 3D carousel sliders being used to display project highlights, client testimonials, case studies, etc.
You May Also Like:
- [Bootstrap 5 Landing Page Website](https://www.divinectorweb.com/2022/01/bootstrap-5-landing-page-template.html)
- [3D Testimonial Carousel Slider](https://www.divinectorweb.com/2022/03/3d-carousel-testimonial-slider.html)
- [Bootstrap 5 Multi-level dropdown Menu](https://www.divinectorweb.com/2024/01/bootstrap-5-multi-level-dropdown-menu-design.html)
Creative agency and studio-type websites use this type of slider to show their service overview, team profile, creative awards and recognition, etc. Also, real estate websites, tourism websites, news websites, and fashion websites are using 3D carousel sliders to display their content to users these days.
```
<!DOCTYPE html>
<html lang="en">
<!--
Website: divinectorweb.com
Subscribe Us: https://www.youtube.com/c/Divinector
Support Us: https://www.buymeacoffee.com/divinector
-->
<head>
<meta charset="UTF-8">
<title>How to Create 3D Glowing Card Carousel using Materialize CSS</title>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/materialize/1.0.0/css/materialize.min.css">
<link rel="stylesheet" href="style.css">
</head>
<body>
<div class="carousel">
<div class="carousel-item"></div>
<div class="carousel-item"></div>
<div class="carousel-item"></div>
<div class="carousel-item"></div>
<div class="carousel-item"></div>
</div>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/materialize/1.0.0/js/materialize.min.js"></script>
<script>
$(document).ready(function(){
$('.carousel').carousel({
padding: 200
});
autoplay();
function autoplay() {
$('.carousel').carousel('next');
setTimeout(autoplay, 4500);
}
});
</script>
</body>
</html>
```
```
body {
margin: 0;
padding: 0;
background: #021514;
}
.carousel{
height: 600px;
perspective: 400px;
margin-top: 5%;
}
.carousel .carousel-item {
width: 400px;
height: 500px;
box-shadow: 0 0 40px #61dafb, 0 0 40px #61dafb, 0 0 40px #61dafb;
animation: animate 2s infinite alternate;
border-radius: 15px;
}
@keyframes animate {
to {
box-shadow: 0 0 50px #61dafb, 0 0 50px #61dafb, 0 0 50px #61dafb;
}
}
```
For the Original Code: [Click Here](https://www.divinectorweb.com/2024/01/3d-glowing-card-carousel-slider-design.html)
| divinector |
1,889,984 | Unleashing the Power of Serverless Data Analysis with AWS Athena | Unleashing the Power of Serverless Data Analysis with AWS Athena In today's data-driven... | 0 | 2024-06-16T03:02:29 | https://dev.to/virajlakshitha/unleashing-the-power-of-serverless-data-analysis-with-aws-athena-3amh | 
# Unleashing the Power of Serverless Data Analysis with AWS Athena
In today's data-driven world, the ability to extract meaningful insights from vast datasets is paramount. As organizations accumulate data at an unprecedented rate, traditional data warehousing solutions often struggle to keep pace. Amazon Web Services (AWS) offers a compelling solution to this challenge with Amazon Athena, a serverless interactive query service that makes it easy to analyze data in Amazon S3 using standard SQL.
### What is AWS Athena?
Athena is a game changer for several reasons:
* **Serverless Simplicity:** Say goodbye to the complexities of managing infrastructure. With Athena, there are no servers to provision or manage. You simply point Athena at your data stored in S3, define your schema, and start querying using standard SQL.
* **Pay-Per-Query Pricing:** Cost-efficiency is a key benefit. You pay only for the queries you run. This eliminates the need for over-provisioning expensive data warehouse infrastructure "just in case" you need the capacity.
* **Built for Speed:** Athena leverages the power of massive parallelism to deliver fast query performance. It scales automatically based on the size and complexity of your data, ensuring quick results even for large datasets.
### Unlocking Data Insights: Use Cases for AWS Athena
Let's explore practical scenarios where Athena shines:
**1. Ad Hoc Data Exploration and Analysis**
Imagine you're a data analyst tasked with understanding customer behavior based on website clickstream data stored in S3. Athena makes this exploration effortless. You can directly query this semi-structured data (e.g., JSON, CSV) stored in S3 using familiar SQL syntax. You could run queries to:
* Identify top-performing landing pages
* Segment customers based on purchase history
* Discover usage patterns for specific product features
The ability to quickly run interactive queries without complex data preparation empowers analysts to uncover valuable insights rapidly.
**2. Log Analysis and Troubleshooting**
Modern applications generate a deluge of log data. These logs, often stored in S3, contain a treasure trove of information about application health, user activity, and potential issues. Athena simplifies log analysis by allowing you to:
* Query logs directly in S3 without the need for ETL
* Identify error patterns and anomalies
* Track user behavior and application performance over time
By providing a SQL-based interface to your log data, Athena becomes an invaluable tool for troubleshooting and optimizing your applications.
**3. Security and Compliance Auditing**
Security and compliance are non-negotiable. Athena can help you meet stringent audit requirements by simplifying the analysis of security logs, access logs, and other audit trails. Use cases include:
* Identifying unauthorized access attempts
* Tracking data access patterns to ensure compliance with regulations like GDPR
* Generating reports for auditors, demonstrating compliance efforts
**4. Data Lake Exploration and Discovery**
Data lakes are becoming increasingly popular as organizations strive to store and analyze diverse data sets in their raw format. Athena is a natural fit for data lake exploration. Its schema-on-read approach means you don't have to predefine a rigid schema before ingesting data. This flexibility allows you to:
* Query data in its native format, regardless of structure
* Run exploratory queries to discover hidden correlations and patterns
* Experiment with different data sets and analysis techniques without complex data preparation
**5. Business Intelligence Dashboards and Reporting**
While not a replacement for dedicated BI tools, Athena can empower you to build quick and cost-effective dashboards for less demanding reporting needs. By connecting BI tools like Amazon QuickSight or Tableau to Athena, you can:
* Visualize data stored in S3
* Create interactive reports and dashboards
* Share insights with stakeholders across your organization
### Athena's Ecosystem: Integration with Other AWS Services
Athena seamlessly integrates with other AWS services, enhancing its functionality and ease of use.
* **AWS Glue Data Catalog:** Store table definitions and schema information for your S3 data. This metadata makes it easier to manage and query your data using Athena.
* **Amazon S3:** Your data lake in S3 is where Athena directly queries data from.
* **AWS Lambda:** Use Lambda functions to automate data preparation tasks or trigger Athena queries based on events.
* **Amazon QuickSight:** Connect Athena's query capabilities to QuickSight for data visualization and business intelligence dashboards.
### Comparing Athena: AWS vs. Other Cloud Providers
While Athena excels in the serverless query space, let's compare it with offerings from other major cloud providers:
* **Google BigQuery:** A fully managed data warehouse service with similar capabilities. BigQuery might be preferred if you require a more traditional data warehousing environment.
* **Azure Data Lake Analytics:** Microsoft's offering in the serverless analytics space. It integrates tightly with the Azure ecosystem.
The choice often depends on your existing cloud infrastructure, specific requirements, and familiarity with different ecosystems.
### Conclusion
AWS Athena provides a powerful, serverless, and cost-effective solution for analyzing vast datasets stored in S3. Its ease of use, pay-per-query model, and seamless integration with other AWS services make it an invaluable tool for organizations of all sizes. Whether you're performing ad-hoc data exploration, analyzing logs, ensuring compliance, or gaining insights from your data lake, Athena empowers you to unlock the full potential of your data.
## Architecting a Robust Data Pipeline with Athena for Real-Time Analytics
Let's delve into a more advanced scenario where we utilize Athena as a core component in a robust data pipeline designed for real-time analytics:
**The Challenge:** A rapidly growing e-commerce company needs to capture, process, and analyze massive volumes of streaming data from various sources, including website clickstream data, order events, and social media interactions. The goal is to gain real-time insights into customer behavior, identify emerging trends, and make data-driven decisions with minimal latency.
**Solution Overview:**
1. **Data Ingestion:** Utilize Amazon Kinesis Data Streams to ingest high-velocity data streams from multiple sources in real-time.
2. **Stream Processing:** Leverage Amazon Kinesis Data Analytics for real-time data processing. Use SQL or Apache Flink applications to perform data transformations, aggregations, and enrichments on the streaming data. For example:
* Aggregate website clickstream events into user sessions.
* Join order data with customer profiles to enrich real-time purchase streams.
3. **Data Storage:** Employ different storage options based on the nature of the data:
* Raw Data: Persist the raw streaming data in Amazon S3 for long-term archival and historical analysis.
* Processed Data: Store processed and aggregated data in a time-series database such as Amazon Timestream for fast real-time querying.
4. **Real-Time Analytics:** Implement two parallel query engines:
* **Amazon Athena:** Query raw, historical data in S3 for ad-hoc analysis, trend identification, and retrospective reporting.
* **Amazon Timestream Queries:** Perform low-latency queries on the processed, time-series data in Timestream for real-time dashboards, anomaly detection, and instant insights.
5. **Visualization and Action:** Connect BI tools like Amazon QuickSight to both Athena and Timestream to build interactive dashboards that combine real-time and historical data views. Configure alerts and notifications based on real-time data thresholds to trigger automated actions.
**Benefits of this Architecture:**
* **Real-Time Insights:** The combination of Kinesis, Timestream, and Athena enables near real-time insights from streaming data, empowering rapid decision-making.
* **Scalability and Performance:** Each component scales horizontally, ensuring optimal performance even as data volumes grow.
* **Cost-Effectiveness:** Leverage serverless components like Athena and Kinesis to minimize operational overhead and optimize costs.
* **Flexibility:** The use of different storage and query engines provides the flexibility to handle various data types and analytical needs.
This example illustrates how Athena, when combined with other powerful AWS services, can form the backbone of a highly-scalable and robust data pipeline for sophisticated real-time analytics use cases.
| virajlakshitha | |
1,889,982 | Mastering Client and Server Components in Next.js: A Comprehensive Guide | Deploying interactivity in a Next.js application can be straightforward, but it often comes with... | 0 | 2024-06-16T02:59:33 | https://dev.to/vyan/mastering-client-and-server-components-in-nextjs-a-comprehensive-guide-42hp | webdev, beginners, react, nextjs | Deploying interactivity in a Next.js application can be straightforward, but it often comes with pitfalls. This guide will walk you through the common mistakes and best practices for handling client and server components effectively.
## Introduction
Next.js is a powerful framework for building server-rendered React applications, but it introduces a concept that can be tricky for newcomers: the distinction between client and server components. Understanding when and how to use these components is crucial for optimizing performance and user experience.
## Client vs. Server Components
### The Basics
- **Client Components**: Handle client-side interactivity and are rendered in the browser.
- **Server Components**: Render on the server and come with several benefits, including better performance and security.
### Common Mistake: Converting Entire Pages to Client Components
When you add client-side interactivity to a component, such as an `onClick` event on a button, you might be tempted to convert the entire page into a client component. This approach works but negates the benefits of server components.
### Example Scenario
Let's consider a simple example: a page with an `H1` element and a `Button` component.
```jsx
// pages/index.js
export default function HomePage() {
return (
<div>
<h1>Hello, World!</h1>
<Button />
</div>
);
}
// components/Button.js
export default function Button() {
return (
<button onClick={() => console.log('Hello, World!')}>Click Me</button>
);
}
```
By default, everything in the `app` directory in Next.js is a server component. Attempting to add client-side interactivity directly will result in an error.
### The Wrong Approach
A common mistake is to add the `use client` directive at the top of the page component, converting the entire page into a client component.
```jsx
// pages/index.js
'use client';
export default function HomePage() {
return (
<div>
<h1>Hello, World!</h1>
<Button />
</div>
);
}
```
While this removes the error, it also converts every component imported into this page into client components, including components that don't need client-side interactivity.
### The Right Approach
Instead, add the `use client` directive only to the components that require client-side interactivity.
```jsx
// components/Button.js
'use client';
export default function Button() {
return (
<button onClick={() => console.log('Hello, World!')}>Click Me</button>
);
}
```
This way, the `HomePage` component remains a server component, preserving the benefits of server-side rendering, while the `Button` component handles the client-side interactivity.
## Benefits of Server Components
1. **Data Fetching**: Server components can fetch data closer to the source, improving performance.
2. **Backend Access**: Directly access backend resources like databases, keeping sensitive information secure.
3. **Dependency Management**: Keep large dependencies on the server to avoid bloating client-side bundles.
### Example: Third-Party Libraries
Consider a `Post` component that uses a third-party library like `sanitize-html`.
```jsx
// components/Post.js
import sanitizeHtml from 'sanitize-html';
export default function Post({ content }) {
const cleanContent = sanitizeHtml(content);
return <div dangerouslySetInnerHTML={{ __html: cleanContent }} />;
}
```
If `Post` is imported into a client component, the large `sanitize-html` library would be shipped to the client. By ensuring `Post` remains a server component, we keep the library on the server.
## Structuring Your Application
### Component Tree
Think of your React app as a tree of components, with the root component at the top.
- **Root Component**: In Next.js, this is the `layout` component.
- **Pages**: Various pages of your application, each potentially importing several components.
### Client Components at the Edges
Only mark components as client components at the outer edges of the tree, i.e., the leaves. This minimizes the number of client components and maximizes the benefits of server components.
```jsx
// components/Button.js
'use client';
export default function Button() {
return (
<button onClick={() => console.log('Hello, World!')}>Click Me</button>
);
}
// pages/index.js
import Button from '../components/Button';
export default function HomePage() {
return (
<div>
<h1>Hello, World!</h1>
<Button />
</div>
);
}
```
## Handling Context and Providers
When using context providers or third-party libraries that wrap your application, such as a theme provider, it's crucial to understand their impact on client and server components.
```jsx
// components/ThemeProvider.js
'use client';
export function ThemeProvider({ children }) {
return <ThemeContext.Provider value={theme}>{children}</ThemeContext.Provider>;
}
// pages/_app.js
import { ThemeProvider } from '../components/ThemeProvider';
function MyApp({ Component, pageProps }) {
return (
<ThemeProvider>
<Component {...pageProps} />
</ThemeProvider>
);
}
export default MyApp;
```
### Important Note
A provider marked as a client component does not convert its children to client components as long as it passes them through using the `children` pattern.
## Conclusion
Mastering the use of client and server components in Next.js requires an understanding of their differences and benefits. By following best practices and avoiding common pitfalls, you can build highly efficient and performant applications.
### Further Learning
If you're diving into React and Next.js, ensure you have a solid grasp of JavaScript and CSS fundamentals. These are the building blocks that will make your journey with these frameworks smoother.
| vyan |
1,850,651 | Dealing with Unicode strings, done right and better. | Have you ever heard of Grapheme Cluster? `unicode-segmenter` is a lightweight solution for it. Let me explain how can I build it. | 0 | 2024-06-16T02:59:00 | https://dev.to/cometkim/dealing-with-unicode-string-done-right-and-better-2nei | javascript, unicode, performance, webdev | ---
title: Dealing with Unicode strings, done right and better.
published: true
description: Have you ever heard of Grapheme Cluster? `unicode-segmenter` is a lightweight solution for it. Let me explain how can I build it.
tags:
- javascript
- unicode
- performance
- webdev
---
## TL;DR
I created a library called "[unicode-segmenter](https://github.com/cometkim/unicode-segmenter)" to handle Unicode grapheme clusters with good performance and reasonable bundle size. Check it out!
This article is not just about promoting my library but also about the process of creating a high-quality library, including optimization and testing.
## Intro
Have you ever heard of the term "grapheme cluster"? If you're using non-English languages or supporting emoji in your service, you probably have.
One key lesson from Unicode is that strings often require more space than they appear to.
If we used UCS-4 (or UTF-32), it would be sufficient to represent every character ever invented, making it easy to count each character. However, this would waste a lot of space.
Therefore, most programming languages use more efficient encodings like UTF-8 or UTF-16. JavaScript uses UTF-16 to represent characters like "👋" as surrogate pairs (two characters). So in JavaScript, its `.length` property is 2.
Some characters can be even longer by using special characters called "joiners".
- "🇰🇷" displays as 1, but has a `.length` of 4
- "👩👩👦👦" displays as 1, but has a `.length` of 11
- "अनुच्छेद" displays as 4, but has a `.length` of 8
- Some [complex characters](https://github.com/cometkim/unicode-segmenter/blob/657e31a7cdbaf64769528596d11e6df03e9ee1e7/test/grapheme.js#L103) displays as 6, but has a `.length` of 75! 🤯
A unit internally expressed as multiple characters but logically treated as one character is called a "Grapheme Cluster."
Unicode® standardizes how to handle these grapheme clusters in [UAX#29](Unicode® Standard Annex #29), the "Unicode Segmentation" rules.
## The problem
Handling graphemes is crucial when creating custom inputs, text editors, or code analyzers that count characters.
There is the Web's [`Intl.Segmenter`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/Segmenter) API that supports the Unicode Segmentation standard. It's available not only in Web browsers like Chrome and Safari, but also in JS runtimes like Node.js, Deno, and Bun.
However, it's [so new](https://caniuse.com/mdn-javascript_builtins_intl_segmenter) that I couldn't use it for my company's app, [Karrot](https://karrotmarket.com). For more context, Karrot is a massive app with over 18M monthly active users in South Korea, so supporting users on older versions is essential. Given the update frequency of mobile users, versions like Chrome 87 and Safari 14.5 are still not sufficient.
One day, my colleague was analyzing the bundle size of their production and reported an issue with our design system library as it seemed unexpectedly large.
It was the "[graphemer](https://www.npmjs.com/package/graphemer)" library inside, more than 95% of the size of the problematic input component, and is a large enough portion of the overall app that it's even visually noticeable.
Today, graphemer is the most popular way to handle grapheme clusters in JavaScript. (20M weekly downloads on NPM !!)
But graphemer is an old library and is no longer actively maintained. This may result in differences with the latest Unicode version (mostly in Hindi), and no ESM support.
Custom implementations for Unicode are not trivial in bundle size because they include Unicode data. Also, graphemer generates [tons of if-else statements](https://github.com/flmnt/graphemer/blob/72f61c1/src/Graphemer.ts#L107) for performance reasons. (spoiler: it's not performant)
Well, isn't there a better alternative?
## Can WebAssembly (and Rust) save us?
Probably YES!
I already knew that there was a good quality library [unicode-segmentation](https://github.com/unicode-rs/unicode-segmentation) in Rust, and Rust has a great WebAssembly toolchain called [wasm-bindgen](https://github.com/rustwasm/wasm-bindgen).
So I created a simple binding using wasm-bindgen.
```rust
use unicode_segmentation::UnicodeSegmentation;
use wasm_bindgen::prelude::*;
#[wasm_bindgen]
pub fn count(val: &str) -> usize {
val.graphemes(true).count()
}
#[wasm_bindgen]
pub fn collect(val: &str) -> Vec<String> {
val.graphemes(true).map(|s| s.to_string()).collect()
}
```
The above code generates a WASM binary with JavaScript binding. It was surprisingly easy.
After a few manual optimizations, I got a WASM binary in 52KB size. When combined with the bindings, it totals around 55KB. Also, WASM binaries compress very well, coming in at a total of 23KB when compressed by gzip!
This is already smaller than the parsed size of the graphemer library, and since WASM supports streaming compilation, it appeared to be a better option to me.
However, feedback from my colleagues wasn’t positive. The reason was that the size was still too large, and using WebAssembly was not yet feasible for us.
## RIIJS (Rewrite It In JavaScript)
Rust people have a cultural idiom called [RIIR](https://transitiontech.ca/random/RIIR) (Rewrite It In Rust).
Although WebAssembly is known for its performance, its size can sometimes be unacceptable in mobile apps, or the performance might not meet expectations due to binding overhead.
A high-quality JavaScript library is still valuable, so I decided to do the opposite: Rewrite It in JavaScript.
First, I reviewed the Rust library’s license. It's dual-licensed under MIT and Apache 2.0, I chose MIT.
Then I began by modifying its code generator, which was written in Python, to produce JavaScript instead of Rust. Since I’m not familiar with Python code, this was the most time-consuming task.
By utilizing my knowledge of Rust and JavaScript, I ported the implementation of its [`Iterator`](https://doc.rust-lang.org/std/iter/trait.Iterator.html) trait into JavaScript’s [iteration protocol](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Iteration_protocols).
Since JavaScript doesn't have a pattern-matching like Rust, it could be hard to replicate the same logic. I used the [ReScript](https://rescript-lang.org/) compiler to maintain the original logic as much as possible. It made me able to port it confidently. Specifically [`check_pair` function](https://github.com/unicode-rs/unicode-segmentation/blob/dce3a34/src/grapheme.rs#L264) can be converted into [this](https://rescript-lang.org/try?version=v11.1.0&code=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-aXR6fUGwxGJ95GTgcZyeR3ur7k-nGXhKG5WAIPrcAwIBkPYTxQHC8KrjmX4wLcEIAG7WJKEhQPCEDyBIWIobAEhgt0ThQJhFQwCQcabFsW46Du1h2I4zhuB43ikbWACE4JQvY87sOwcZlBUVQ1PU+iNM4fztPxlT0NUdQNPczQSgCeBAtIAC0yIQvoBATEgSBQEQ3HCAyxxzIe4psZBsHGRkNnMAAvigdlAA).
After some test-fix loops, I got the first working version and the result was way better than expected. It was [3x smaller in size and 2.5x faster](https://github.com/cometkim/unicode-segmenter/tree/ac4c9ba8e55144233c43be97c50cc417f0388d7d#benchmark) than the graphemer 😲
(It was the initial result and even better now!)
## Reducing bundle size
The major win of the library comes from choosing the simplest structure to store the Unicode data table. This wins in both size and performance. Not only that but there are also various techniques and efforts to achieve an even smaller size.
### Using JavaScript generator
JavaScript has a syntax for stateful logic known as "[Generator](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Generator)". Generator is highly expressive, making them 40% smaller (1682 bytes into 1011 bytes) than an equivalent class with the same functionality!
You can see both [class version](https://github.com/cometkim/unicode-segmenter/blob/ac4c9ba8e55144233c43be97c50cc417f0388d7d/src/grapheme-class.js) and [generator version](https://github.com/cometkim/unicode-segmenter/blob/ac4c9ba8e55144233c43be97c50cc417f0388d7d/src/grapheme.js) in old commits.
### Considering compression
JavaScript code is mostly transmitted with compression like gzip or brotli (zstd soon).
The minified graphemer library is 89.08 KB, but after gzip compression, it reduces to 13.15 KB. This is because the library size is significantly inflated by a bunch of if-else statements, and compression algorithms excel at such repetitive stuff.
unicode-segmenter aims to be small even before compression, but it also carefully considers the size after compression.
For instance, when dealing with character data like `“\u{1F680}”`, a minifier like Terser tries to unescape it to `"🚀"`. Unescaping can reduce code size since escape sequences require additional characters. However, in the case of data tables with a significant number of escaped characters, gzip compression is highly effective, making it better not to unescape them. The results are summarized in this [pull request](https://github.com/cometkim/unicode-segmenter/pull/11).
### Enabling tree-shaking
JavaScript production apps use bundlers. These tools can exclude unused modules from the final bundle or completely remove unused code through static analysis.
The one goal of unicode-segmenter is to provide a complete polyfill for `Intl.Segmenter`. However, if only grapheme segmentation is needed, it adopts a well-considered modular structure to ensure that unnecessary parts are not included.
The exposed APIs have independent entries based on their respective topics.
- `unicode-segmenter/emoji` (1KB): Provides emoji matchers
- `unicode-segmenter/general` (5.9KB): Provides alphabet/number matchers
- `unicode-segmenter/grapheme` (9.6KB): Provides text segmentation by extended grapheme cluster
- `unicode-segmenter/intl-polyfill` (9.9KB): Provide `Intl.Segmenter` (currently grapheme only) polyfill
- `unicode-segmenter/utils` (300B): Provide utilities for UTF-16 and Unicode code points.
## Optimizing performance
Thanks to the unicode-rs' excellent implementation I referenced, it was already 2.5x better than graphemer in its first version. It's mostly a hand-written binary search in a compressed Unicode data table. It's simple but very efficient.
However, for even better results, it is important to fully consider the characteristics of the language.
### Leverage the compiler
As mentioned above, the ReScript compiler was very helpful in the initial porting process.
I ended up [rewriting it by hand](https://github.com/cometkim/unicode-segmenter/pull/33) for the best performance, but until then it allowed me to focus on other areas first, as it always ensures accuracy and sufficient efficiency.
### Using the optimal data type
JavaScript engines also have a compilation process called JIT(Just-In-Time compilation). One well-known thing is that they are very efficient when dealing with 32-bit integers (aka SMI; small integers).
A Unicode data is a list of ranges of Unicode code points, which are 32-bit integers. Therefore, I was able to make all operations internally based on SMI.
Unlike Rust, where the compiler checks data types, in JavaScript, this responsibility falls entirely on the developer. I managed to do it with careful attention.
As a result, performance more than **doubled** in the [second release](https://github.com/cometkim/unicode-segmenter/releases/tag/unicode-segmenter%400.2.0).
### Explicit bindings
When using generators or regular functions instead of classes, it is natural to implicitly capture external variables through "[closures](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Closures)". However, implicit bindings can negatively impact optimization and garbage collection.
To avoid this, simply hoisting functions resulted in an additional 10% improvement. (See [the change](https://github.com/cometkim/unicode-segmenter/commit/7590438979dddd0ed5a073ead6b9f74d816d27e3))
### Avoiding copying and constructing structs
When dealing with more than one piece of data, there’s a desire to handle it as a structure.
However, JavaScript lacks efficient records/tuples, and both `Object` and `Array` always come with a cost. While this isn’t an issue for most applications, it can be critical in the micro-benchmarks of libraries.
It is also very important to avoid implicit copying. If necessary, pass references directly and perform the copy explicitly.
```javascript
// retained `cache` reference
function cat(cp, cache) {
...
if (cp < cache[0] || cp > cache[1]) {
let result = searchGraphemeCategory(cp);
// update its values by explicit copying
cache[0] = result[0];
cache[1] = result[1];
cache[2] = result[2];
}
return cache[2];
}
};
```
### Continuous benchmarking and efforts!
What helped getting faster mostly was the benchmark tool that was set up from the very beginning and the continuous measurements.
I use [mitata](https://github.com/evanwashere/mitata) (pretiously [tinybench](https://github.com/tinylibs/tinybench)). If you care about performance, I highly recommend you do it.
However, poorly designed benchmarks can be as dangerous as having none. They might be completely invalidated by the compiler, too small to reflect real-world scenarios, or fail to identify scalability issues.
To avoid these pitfalls, it is crucial to design benchmarks to be as close to the real world as possible. unicode-segmenter gets help from ChatGPT to construct tests that resemble real code!
Benchmarks can yield very different results depending on the environment. Therefore, I run it not only in my local environment but also across various versions of Node.js and Bun, on various OS and CPU architectures, and I also configure them to run in browsers to verify performance in both Chrome and Safari. Through this process, I confirmed that the performance of `Intl.Segmenter` has improved significantly in recent versions of Node.js, Chrome, and Safari. This is very exciting news!
But efforts are still worth it since not everyone is using the latest version or ideal environment :)
## Testing strategy
Testing is crucial. Since Unicode involves characters that might be unfamiliar, extensive testing was necessary.
I set up initial test suites with [Node.js test runner](https://nodejs.org/api/test.html) (It's great!) and manually wrote a few known cases, but it was never enough.
### Property-based testing
I tried a more precise method called "Property-based testing".
[fast-check](https://fast-check.dev/) is the most popular PBT tool in the JavaScript ecosystem. With fast-check, I can easily write test code that defines properties and verifies them based on automated inputs.
Then, how is the verification done? The idea is to check if the results match those of `Intl.Segmenter`, which is already available at the Node.js runtime!
```js
test('graphemeSegments', async t => {
await t.test('unicode string', () => {
// Intl.Segmenter is available on Node.js!
const intlSegmenter = new Intl.Segmenter();
fc.assert(
fc.property(fc.fullUnicodeString(), input => {
// assert through automated input
assertObjectContaining(
[...graphemeSegments(input)],
[...intlSegmenter.segment(input)],
);
}),
);
});
});
```
Through PBT, I found and fixed numerous bugs in the initial implementation. The first bug PBT identified was an empty string (`""`). 😅 This is a surprisingly common mistake.
I completely switched my primary testing method to PBT and set up additional tests to debug the counterexamples found.
### Generating test suites
Unicode provides [official test data](https://www.unicode.org/Public/15.1.0/ucd/auxiliary/GraphemeBreakTest.html). I used the data to generate test suites and check for spec compliance.
During this process, I discovered that the Rust library I referenced had not yet implemented the “GB9c” rule, so I [implemented it myself](https://github.com/cometkim/unicode-segmenter/pull/29). (It seems they [implemented it recently](https://github.com/unicode-rs/unicode-segmentation/pull/134))
### Production testing
I understand that despite all these efforts, it might still be insufficient. Reality can sometimes be more extreme than theory.
I tried to create migration PRs directly to major dependents of graphemer. I found a few issues related to implementation, and many others related to TypeScript configuration, sourcemap setup, etc.
By supporting both large and small-scale projects, I was able to update the library and gain confidence in its final quality.
## Conclusion
As a result, my app achieved a smaller bundle size and better performance.
I also learned that what it does is not that simple. This should be a temporary alternative to `Intl.Segmenter`.
I recommend to use `Intl.Segmenter` where possible. The unicode-segmenter library might become another graphemer after 10 years. Who knows!
But if you are in a special environment where `Intl.Segmenter` is not available, try [unicode-segmenter](https://github.com/cometkim/unicode-segmenter). It provides good performance in a reasonable size.
Especially if you build something on the React Native and the [Hermes](https://hermesengine.dev/) engine. unicode-segmenter supports it [pretty well](https://github.com/cometkim/unicode-segmenter/pull/47)!
Also, there are more coming shortly
- It will soon provide a full `Intl.Segmenter` polyfill, including word/sentence support. ([issue #25](https://github.com/cometkim/unicode-segmenter/issues/25))
- It will support more advanced patterns that `Intl.Segmenter` doesn't, like backward iteration. ([issue #26](https://github.com/cometkim/unicode-segmenter/issues/26))
Are you struggling with the quality of the library in another area? Consider taking some time to investigate. We still have many opportunities for further improvement in the JavaScript ecosystem. | cometkim |
1,889,981 | aws cli on windows vscode | Hello all, I have been trying to use aws cli on windows vscode bash, powershell but it keeps saying... | 0 | 2024-06-16T02:48:26 | https://dev.to/bartdev/aws-cli-on-windows-vscode-2h16 | aws, webdev, devops, help | Hello all,
I have been trying to use aws cli on windows vscode bash, powershell but it keeps saying aws command not found.
I assume I need update the $path variable to the aws cli but i get bit confused on the process. I think on mac it worked so never had to set this up.
I have tried google and follow aws docs. the cli is installed and i tried installing vscode extenstion aws tookkit.
aws cli cdk 2.0 in vscode not work :( | bartdev |
1,889,980 | Top JavaScript Frameworks in 2024 | Explore the Leading JavaScript Frameworks for Modern Web Development A Comprehensive Guide to the... | 0 | 2024-06-16T02:30:32 | https://dev.to/1saptarshi/top-javascript-frameworks-in-2024-1i7i | javascript, angular, nextjs, vue | Explore the Leading JavaScript Frameworks for Modern Web Development
A Comprehensive Guide to the Best JavaScript Frameworks in 2024 , The Ultimate Guide to Choosing the Right JavaScript Framework
Stay Ahead in Web Development with These Cutting-Edge JavaScript Frameworks
In the fast-evolving world of web development, staying updated with the latest frameworks is crucial for building robust and efficient applications.
This guide aims to provide a detailed overview of the top JavaScript frameworks in 2024, helping developers make informed decisions.
We will explore the key features, benefits, and use cases of the leading JavaScript frameworks, including React, Angular, Vue.js, Svelte, and Next.js.
JavaScript frameworks have become essential tools for developers, simplifying the process of building complex web applications. With numerous options available, choosing the right framework can significantly impact the development process and the final product.
Understanding the strengths and weaknesses of each framework helps developers select the most suitable tool for their projects, enhancing productivity and ensuring optimal performance.
**Tools/Techniques:**
**React:**
**Component-Based Architecture:** Encourages reusable and maintainable code.
**Virtual DOM:** Improves performance by minimizing direct DOM updates.
**React Hooks:** Simplifies state management in functional components.
**Benefits:** High performance, strong community support, and extensive ecosystem.
**Angular:**
**Two-Way Data Binding:** Synchronizes the model and view in real-time.
**Dependency Injection:** Enhances modularity and testability.
**TypeScript Integration:** Provides static typing and advanced tooling.
**Benefits:** Comprehensive framework, excellent tooling, and enterprise readiness.
**Vue.js:**
**Reactive Data Binding:** Automatically updates the view when the model changes.
**Single File Components:** Encapsulates HTML, CSS, and JavaScript in a single file.
**Vue CLI:** Streamlines project setup and development.
**Benefits:** Gentle learning curve, high performance, and flexibility.
**Svelte:**
**Compile-Time Optimizations:** Generates highly optimized JavaScript code.
**No Virtual DOM:** Directly manipulates the DOM, reducing overhead.
**Reactivity Built-In:** Simplifies state management with a reactive approach.
**Benefits:** Excellent performance, simplicity, and smaller bundle sizes.
**Next.js:**
**Server-Side Rendering (SSR):** Enhances performance and SEO.
**Static Site Generation (SSG):** Generates static HTML at build time.
**API Routes:** Allows building API endpoints within the same project.
**Benefits:** Versatile rendering options, seamless React integration, and strong performance.
**Implementation Steps/Guide:**
**React Implementation:**
**Step 1: **Install Node.js and npm.
Step 2: Create a new React application using create-react-app.
Step 3:** Develop components and use React Hooks for state management.
**Step 4:** Deploy the application using services like Vercel or Netlify.
```
import React, { useState } from 'react';
function App() {
const [count, setCount] = useState(0);
return (
<div>
<p>You clicked {count} times</p>
<button onClick={() => setCount(count + 1)}>
Click me
</button>
</div>
);
}
export default App;
```
**Angular Implementation:**
**Step 1:** Install Node.js and npm.
**Step 2:** Install Angular CLI and create a new project using ng new.
**Step 3:** Develop components, services, and use Angular’s built-in tools.
**Step 4:** Deploy the application using services like Firebase Hosting or AWS
```
import { Component } from '@angular/core';
@Component({
selector: 'app-root',
template: `
<h1>Welcome to Angular!</h1>
<button (click)="increment()">Click me</button>
<p>You clicked {{ count }} times</p>
`,
})
export class AppComponent {
count = 0;
increment() {
this.count++;
}
}
```
**Vue.js Implementation:**
**Step 1: **Install Node.js and npm.
**Step 2:** Create a new Vue project using Vue CLI.
**Step 3:** Develop components and manage state using Vuex.
**Step 4:** Deploy the application using services like Netlify or Heroku.
```
<template>
<div>
<p>You clicked {{ count }} times</p>
<button @click="increment">Click me</button>
</div>
</template>
<script>
export default {
data() {
return {
count: 0,
};
},
methods: {
increment() {
this.count++;
},
},
};
</script>
```
**Real-World Case Studies :**
**Facebook (React)**
Facebook uses React to build dynamic and responsive user interfaces. Leveraging React’s component-based architecture and virtual DOM. Achieved high performance and maintainable codebase.
**Google (Angular)**
Google employs Angular for large-scale enterprise applications like Google Cloud Console. Utilizing Angular’s robust features like dependency injection and TypeScript.
**Alibaba (Vue.js)**
Alibaba uses Vue.js for its flexibility and ease of integration. Building interactive and lightweight web applications. Improved performance and rapid development cycle.
**Conclusion :**
The JavaScript frameworks React, Angular, Vue.js, Svelte, and Next.js each offer unique advantages for modern web development. Choosing the right framework depends on the project requirements and the development team’s expertise.
Staying updated with the latest frameworks and tools ensures developers can build high-performance, scalable, and maintainable applications.
Explore these frameworks further, try out code examples, and determine which framework best suits your next project.
**Further Reading/Resources**
React Documentation: [React Official Site](https://react.dev/)
Angular Documentation: [Angular Official Site](https://angular.dev/)
Vue.js Documentation: [Vue.js Official Site](https://vuejs.org/)
Svelte Documentation: [Svelte Official Site](https://svelte.dev/)
Next.js Documentation: [Next.js Official Site](https://nextjs.org/)
**Which JavaScript framework are you most excited about in 2024?**
**Comments: Share your experiences and thoughts on these frameworks. What projects have you built using them?**
| 1saptarshi |
1,889,949 | A PAGE TALKS ABOUT (Postbot: The AI Assistant By Postman) | MY ANALYSIS: PICTURE THIS The channel has already published a short story titled ‘AI-ERA:... | 0 | 2024-06-16T02:22:40 | https://dev.to/rewirebyautomation/a-page-talks-about-postbot-the-ai-assistant-by-postman-1lkh | automation, apiautomation, postman, postmanapi | **_MY ANALYSIS: PICTURE THIS_**
The channel has already published a short story titled **_‘AI-ERA: Demystified In A Nutshell’._** If you haven’t read it yet, please navigate to this story first. I recommend reading the introductory story as a prerequisite before continuing below. It will help you benefit from and establish connectivity throughout this journey.
---
{% embed https://dev.to/rewirebyautomation/a-page-talks-about-ai-era-demystified-in-a-nutshell-bf6 %}
---
**A PAGE TALKS ABOUT column from the @reWireByAutomation channel**. Picture this story as a follow-up to the parent story titled **‘AI-ERA: Demystified In A Nutshell.’** As stated in the parent story, **@reWireByAutomation** presents **“Postbot: The AI Assistant by Postman”**, providing a quick overview of the LLM concept and its presence and utilization in the relevant API Test Automation field in the form of **Postbot assistant.**
Refer to the mind map below that outlines the Program of the Story
Refer to the mind map below titled **_‘Picture This: AI Assistant at a Glance’_** which presents an overview of the AI Assistant. It focuses on the trained model that has evolved into a specific assistant, supporting and enhancing the journey of API Test Automation on the Postman platform.
Refer to the mind map below titled **_‘Picture This: The Postbot: Introduction’_** which presents an overview of the **_‘Postbot’_** and its integration into the Postman platform. It highlights features related to API Test Automation from a testing perspective. The journey of Postbot is evolving, with new features being added over time.
Refer to the mind map below titled **_‘Picture This: Traditional to Augmented Model’_** which illustrates the association of Postbot in the journey of the API Test Automation life cycle. It primarily focuses on augmenting API test development, building on top of traditional model development.
Refer to the mind map below titled **_‘Picture This: Probability at Results Overview’_** which presents the code delivery at scale compared to the traditional model and its value additions during the journey. The outlined value additions are probable, depending on the nature of test designs and validation requirements. API Test Automation offers numerous ways to utilize its strength and depth in the testing model, leading to the probability of tangible results after implementation. It is up to individual perception how best to utilize the Assistant according to their needs.
> **_The Conclusion: Picture This_**
> **_Refer to the voiceover session below from the [@reWireByAutomation](https://www.youtube.com/@reWirebyAutomation) YouTube channel._**
{% embed https://youtu.be/Y6x3Zabg950 %}
---
> As part of the upcoming stories, I will soon publish **_‘some more Ai Assistants available in the market’_** which are designed to offer valuable insights into Augmented Test Automation and Delivery in any form.
---
> @reWireByAutomation will soon publish a detailed course on Postbot to maximize the use of the AI Assistant.
**_This is @reWireByAutomation, signing off!_**
| rewirebyautomation |
1,889,950 | P=NP? 256 chars | This is a submission for DEV Computer Science Challenge v24.06.12: One Byte Explainer. ... | 0 | 2024-06-16T02:15:40 | https://dev.to/fmalk/pnp-256-chars-49k7 | devchallenge, cschallenge, computerscience, beginners | *This is a submission for [DEV Computer Science Challenge v24.06.12: One Byte Explainer](https://dev.to/challenges/cs).*
## Explainer
If a problem has an answer which can be quickly checked for correctness, does it mean the problem must have a solution that can be calculated quickly as well (P=NP)? Or just because we can quickly check an answer does not mean it is easy to get one (P≠NP)?
## Additional Context
This is arguably **the** hardest, most famous and difficult open problem (no general proof exists yet) in Computer Science and even for general Math. So of course I'd take a crack at describing it at this challenge!
Since this is tagged as a #beginners challenge I tried to do come up with an answer that might not be 100% formal math because I didn't want to rely on the reader knowing that "quickly" here means "in polynomial time" or what a P and NP-problem actually is, so a reader not familiar with the topic might at least get a good grasp of what the problem is about. Just know that many researchers dedicate their entire careers studying this problem, so enunciation alone is a worthy topic in itself.
It is believed that P≠NP because there's more evidence pointing to it than the alternative: cryptography as we know rely heavily on P≠NP being true; if proven not to be the case a whole new paradigm of computing could come to light and break stuff we consider secure to use. | fmalk |
1,889,946 | RDS mySQL works - fix | https://stackoverflow.com/questions/37212945/aws-cant-connect-to-rds-database-from-my-machine | 0 | 2024-06-16T02:02:54 | https://dev.to/said_olano/rds-mysql-works-fix-151m | https://stackoverflow.com/questions/37212945/aws-cant-connect-to-rds-database-from-my-machine
| said_olano | |
1,889,944 | OCR Technology: Revolutionizing Legal Contract Management | Welcome to an engaging narrative that expertly weaves together the intricate world of legal contract... | 27,673 | 2024-06-16T01:52:43 | https://dev.to/rapidinnovation/ocr-technology-revolutionizing-legal-contract-management-455 | Welcome to an engaging narrative that expertly weaves together the intricate
world of legal contract management and the cutting-edge advancements in
optical character recognition (OCR) technology. As a seasoned expert who has
observed firsthand the transformative evolution of technology within the legal
sector, I am poised to guide you through this extraordinary fusion.
## Digital Alchemy: From Paper to Pixels
In an era where digital innovation is the cornerstone of progress, the legal
industry is riding the wave of this transformation. The incorporation of OCR
technology into contract management symbolizes a significant leap from the
tangible, paper-bound world to a dynamic digital domain. This transition can
be likened to a form of digital alchemy, where what was once a tedious and
time-consuming process of handling physical documents has been elegantly
transformed into a streamlined, efficient digital workflow.
## Accelerated Information Retrieval
The advent of OCR technology in the legal domain has fundamentally altered the
landscape of information retrieval from contracts, propelling it into a new
era of efficiency and precision. Imagine it as akin to acquiring a hyper-
efficient personal assistant, one who possesses the remarkable ability to
instantly pinpoint any specific clause, term, or section from within an
expansive collection of contracts. This technological innovation effectively
eliminates the arduous and time-consuming process of manual searches, ushering
in an unprecedented level of efficiency that was once deemed unattainable.
## Lightening the Load of Contract Management
The integration of OCR technology into legal contract management has brought a
refreshing transformation to a field often weighed down by the monotony and
tedium of traditional practices. What was once seen as a cumbersome and
wearisome task has now been reinvigorated with a newfound sense of ease and
even an element of light-heartedness.
## Gamifying Contract Navigation
The concept of gamifying contract navigation is a revolutionary approach in
the legal field, made feasible through the advent of OCR technology. Picture
the task of sifting through contracts and legal documents, traditionally
perceived as monotonous and labor-intensive, now reimagined as an engaging and
interactive game. This innovative use of OCR technology transforms the search
for specific clauses and terms into an exciting and intellectually stimulating
pursuit.
## A New Frontier for Entrepreneurs
The incorporation of OCR technology into legal contract management marks a
groundbreaking development for entrepreneurs and business leaders, heralding a
new era in the way business operations are conducted. This technology is more
than just a facilitator of document handling; it is a catalyst for a
comprehensive paradigm shift in business processes.
## Towards a More Synchronous Workflow
The integration of OCR technology into business operations, particularly in
the legal sector, is paving the way for a future characterized by more
synchronous workflows. This technological advancement is revolutionizing how
contract management is executed, allowing it to seamlessly blend with other
business processes, thus fostering a more cohesive and efficient operational
structure.
## Conclusion: A Path Less Travelled in Legal Management
The journey of integrating OCR technology into legal contract management is
indeed a path less travelled, one that heralds a new era of innovation,
efficiency, and transformative practices in the legal profession. This
venture, once untrodden and perhaps even unimagined, now unfolds a myriad of
opportunities for legal professionals and businesses, marking a significant
departure from traditional methods.
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| rapidinnovation | |
1,889,891 | RECURSION: A Beginner’s Guide | The concept of recursion in JavaScript programming has always been equal parts fascinating,... | 0 | 2024-06-16T01:45:47 | https://dev.to/wendyver/recursion-a-beginners-guide-57pd | programming, javascript, tutorial, recursion | ---
title: "RECURSION: A Beginner’s Guide"
published: true
tags: programming, javascript, tutorial, recursion
canonical_url: null
cover_image: https://dev-to-uploads.s3.amazonaws.com/uploads/articles/79di3e8eyvslo81x27e5.jpg
series: null
---
The concept of recursion in JavaScript programming has always been equal parts fascinating, intimidating, and mystifying to me. Today, I will let the fascinating part guide me as I grapple with explaining recursion to you, my reader, as well as to myself. May we both have a fuller understanding of the beauty, intricacies, and utility inherent in this humble programming technique by the end of this blog post.
## What is Recursion?
Before we get to the 'why' and the 'how', it might be a good idea to start with the 'what'. What exactly is recursion in the context of programming? According to MDN, recursion is "the act of a function calling itself."
Take a look at this simple example:
```javascript
function infiniteJest() {
console.log("HA!");
infiniteJest();
}
```
The function `infiniteJest()` calls itself within its own body, making it a recursive function. What do you think would happen if we called this function?
If you call `infiniteJest()`, it will print "HA!" to the console. And then it will print "HA!" again. And then again. And again. It will keep printing "HA!" to the console until the end of time, unless someone or something stops it. This is not a situation we want to find ourselves in, so how can we modify our function to prevent it from being infinitely loopy? If you said "use a base case," then you are absolutely correct! Every recursive function needs a base case so that it knows when to stop.
One way to do this is to give `infiniteJest` a `counter` parameter so we can tell the function how many times we want it to print "HA!":
```javascript
function infiniteJest(counter) {
if (counter > 0) {
console.log("HA!");
infiniteJest(counter - 1);
}
}
```
## Why Use Recursion?
Now that we know what recursion is and the basics of how it works, you might wonder why we would choose recursion over simpler alternatives like loops. We probably don’t want to create a function like `infiniteJest()` that will just laugh at us all day long, and even if we did, there are simpler ways to achieve this.
One major reason that recursion is sometimes preferred over loops is that it can solve complex problems in a more elegant and readable way. Also, it often takes a lot less code. Let’s look, for example, at a recursive way of calculating factorials:
```javascript
function factorial(n) {
if (n === 0) {
return 1;
}
return n * factorial(n - 1);
}
```
We can also find factorials using a `for` loop, but it takes more code, is more confusing, and doesn’t look as nice. Many situations naturally lend themselves to recursive techniques, including problems that can be broken down into smaller sub-problems, but recursion is not always the best solution.
## The Dangers of Recursion
If we wanted to find the factorial of a very large number, for example, using a `for` loop would actually be preferable. If we used recursion, we would run the risk of stack overflow, which is an error that happens when our program tries to "take up more space than it was assigned," according to MDN. This is one of the dangers of recursion. It uses more memory than iterative approaches and is often slower.
We also run the risk of stack overflow when we neglect to provide a base case or when our base case is not met. This is why it is extremely important to always have a condition that, when met, will stop the recursion.
## Conclusion
Recursion is a powerful tool in programming, offering elegant solutions to many problems by using the function's ability to call itself. By understanding how to use it and when not to use it, we can recurse effectively while avoiding common dangers like stack overflow. Whether you choose recursion or iteration depends on the problem at hand, but mastering recursion opens doors to solving complex problems with clarity and efficiency.
Explore recursion further in your programming journey—it’s not just a technique but a mindset that expands your problem-solving capabilities.
## Further Exploration
If you're eager, as I am, to deepen your understanding of recursion, consider exploring more advanced topics such as tail recursion optimization, memoization, and practical applications in algorithms like tree traversal and dynamic programming.
Also, **these are the resources that helped me write this article**.
They should provide you with a solid understanding of recursion and help you to grasp the concept more easily.
1. **FreeCodeCamp** : https://www.freecodecamp.org/news/recursion-in-javascript/
2. **MDN** : https://developer.mozilla.org/en-US/docs/Glossary/Recursion
3. **How JavaScript works: Recursion in JavaScript, What It is, and How it is used** https://medium.com/sessionstack-blog/how-javascript-works-recursion-in-javascript-what-it-is-and-how-it-is-used-eef3d734f20d#:~:text=Recursion%20is%20a%20programming%20pattern,from%20the%20start%20is%20achieved.
4. **Recursion Vs Loops: A Simple Introduction to Elegant Javascript** https://community.appsmith.com/content/blog/recursion-vs-loops-simple-introduction-elegant-javascript#:~:text=Recursion%20Advantages&text=Clarity%20and%20Readability%3A%20Recursive%20functions,easier%20to%20understand%20and%20maintain.
5. **Recursion: ThePros and Cons** https://medium.com/@williambdale/recursion-the-pros-and-cons-76d32d75973a#:~:text=CONS%3A,that%20of%20an%20iterative%20function.
https://developer.mozilla.org/en-US/docs/Glossary/Call_stack
6. **MDN** https://developer.mozilla.org/en-US/docs/Glossary/Call_stack
| wendyver |
1,889,940 | Refactoring 013 - Remove Repeated Code | Don't Repeat Yourself TL;DR: How to remove repeated code Problems... | 15,550 | 2024-06-16T01:37:23 | https://maximilianocontieri.com/refactoring-013-remove-repeated-code | webdev, beginners, programming, tutorial | *Don't Repeat Yourself*
> TL;DR: How to remove repeated code
# Problems Addressed
- Don't Repeat Yourself
- Copy/Paste Programming
- No single source of truth
# Related Code Smells
{% post https://dev.to/mcsee/code-smell-46-repeated-code-4iib %}
{% post https://dev.to/mcsee/code-smell-11-subclassification-for-code-reuse-1136 %}
{% post https://dev.to/mcsee/code-smell-232-reusable-code-44p5 %}
# Context
Duplicated code is a severe code smell, it leads to maintainability problems and ripple effects.
Start by identifying behavior duplication.
Once you find it, you will extract it into reusable functions or classes, reducing redundancy, creating a single source of truth, and simplifying future updates.
Behavior duplication is a sign of a missing abstraction you need to create.
As always, you should search for it in the real world.
Refactoring isn't a one-time event; it's an ongoing process that should be integrated into your development workflow.
# Steps
1. Make a contextual copy of the repeated code
2. Parametrize what is different
3. Invoke the abstraction
4. Find a real-world metaphor for the abstraction
*(This is the harder and not mechanical step)*
# Sample Code
*(This is actual code generated by Google Gemini)
See a complete explanation in this [talk](https://dev.to/mcsee/clean-code-with-ai-4kck)*
## Before
[Gist Url]: # (https://gist.github.com/mcsee/4faa40928a8ac53cca2d1381c8a2e1c2)
```php
<?php
class AccessControlPanel {
private $users = [];
public function createRegularUser($username, $password, $email) {
$user = [
"username" => $username,
"email" => $email,
"type" => $this->regularUserRole(),
"creationDate" => $this->timeSource->currentTimestamp(),
"needsToChangePassword" = $this->needsToChangePassword(),
"loginPolicy" => $this->userLoginPolicy()
]
$this->users[] = $user;
$this->addCreationToJournal($user);
}
public function createAdminUser($username, $password, $email) {
$user = [
"username" => $username,
"email" => $email,
"type" => $this->regularUserRole(),
"creationDate" => $this->timeSource->currentTimestamp(),
"needsToChangePassword" = $this->needsToChangePassword(),
"loginPolicy" => $this->adminUserLoginPolicy()
]
$this->users[] = $user;
$this->addCreationToJournal($user);
return $user;
}
}
?>
```
## After
[Gist Url]: # (https://gist.github.com/mcsee/9c90a11f4488bfbeded051d6e1be596a)
```php
<?php
class AccessControlPanel {
private $users = [];
// 1. Make a contextual copy of the repeated code
private function createUser(
$username,
$password,
$email,
$role,
$loginPolicy) {
$user = [
"username" => $username,
"email" => $email,
"type" => $role,
"creationDate" => $this->timeSource->currentTimestamp(),
"needsToChangePassword" => $this->needsToChangePassword(),
"loginPolicy" => $loginPolicy
];
$this->users[] = $user;
$this->addCreationToJournal($user);
return $user;
}
// 2. Parametrize what is different (in this case $role and $loginPolicy)
public function createRegularUser($username, $password, $email) {
// 3. Invoke the abstraction
return $this->createUser(
$username,
$password,
$email,
$this->regularUserRole(),
$this->userLoginPolicy());
}
public function createAdminUser($username, $password, $email) {
return $this->createUser(
$username,
$password,
$email,
$this->adminUserRole(),
$this->adminUserLoginPolicy());
}
// 4. Find a real-world metaphor for the abstraction
// private function createUser(
// $username,
// $password,
// $email,
// $role,
// $loginPolicy)
}
?>
```
# Type
[X] Semi-Automatic
The steps are defined but sometimes not about text duplication, but behavior duplication.
# Safety
Since this is not a mechanical refactoring, you need good coverage on the code you modify.
# Why is the code better?
You have a single source of truth, more compact code, and an easier-to-maintain solution.
# Tags
- Coupling
# Related Refactorings
{% post https://dev.to/mcsee/refactoring-002-extract-method-1eee %}
{% post https://dev.to/mcsee/refactoring-003-extract-constant-4j5p %}
{% post https://dev.to/mcsee/refactoring-007-extract-class-18ei %}
{% post https://dev.to/mcsee/refactoring-010-extract-method-object-3ff8 %}
# Credits
Imagen de <a href="https://pixabay.com/en/users/rachealmarie-3893509/">Rachealmarie</a> en <a href="https://pixabay.com/en//">Pixabay</a>
* * *
This article is part of the Refactoring Series.
{% post https://dev.to/mcsee/how-to-improve-your-code-with-easy-refactorings-2ij6 %} | mcsee |
1,889,939 | PixelStore Website | Webstore Template v1.0 | Sell Your Sellix.io Products Through Your Own Webstore Website Integrate Sellix.io seamlessly to... | 0 | 2024-06-16T01:31:24 | https://dev.to/pixelhub/pixelstore-website-webstore-template-v10-3k60 | javascript, html, css, webdev | Sell Your Sellix.io Products Through Your Own Webstore Website
**Integrate Sellix.io seamlessly to create a smooth brand experience for your customers and potentially increase sales.**
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PixelStore Website is a standalone webstore template that lets you sell your products through Sellix.io. It features a clean and organized design, custom website scrollbar, About Me section, Projects section, and advanced JavaScript for customization.
Key features:
* Sell through Sellix.io: Easily integrate your Sellix.io account to sell your digital products.
* Advanced customization: Use the built-in JavaScript to customize the look and feel of your store.
* Responsive design: Your store will look great on all devices, from desktops to smartphones.
Get PixelStore Website today and start selling your products online!
> 📚 **Buy For Here** :- [[clickme](https://builtbybit.com/resources/pixelstore-website-webstore-template.46289/?preview=1
)]
> 🗂 **Discord Server** :- [[clickme](https://discord.gg/PgQQRQnDA6)]
> 📃 **Documentation** :- [[clickme](https://pixel-doc.vercel.app/docs/intro
)]
| pixelhub |
1,889,938 | As a matter of fact AWS Chatbot uses us-east-2 region | Hi, I'm Tak. Today's point is AWS Chatbot. It's trouble that I use AWS Chatbot. There is AWS... | 0 | 2024-06-16T01:24:44 | https://dev.to/takahiro_82jp/as-a-matter-of-fact-aws-chatbot-uses-us-east-2-region-2ghk | aws, chatbot | Hi, I'm Tak.
Today's point is AWS Chatbot.
It's trouble that I use AWS Chatbot.
There is AWS Chatbot in global region.
It is written AWS document.
I think too.
When I use AWS Chatbot, It happen Error.
Then I watch Error message, Message says "to use us-east-2".
I said "Why?"
So I research it.
One of the reasons is regional restrictions.
I can not use us-east-2 region.
Second of the reasons is this document link.
> _For example, the policy below allows AWS Chatbot in us-east-2 but denies other services by using a NotAction element._
https://docs.aws.amazon.com/chatbot/latest/adminguide/chatbot-troubleshooting.html#:~:text=across%20your%20account.-,I%20get%20AccessDenied%20or%20permissions%20errors.,-I%20get%20an
I allow us-east-2, so I use AWS Chatbot.
But Why?
I guess AWS Chatbot use resources in us-east-2 region.
You use AWS Chatbot, Be careful regional restrictions. | takahiro_82jp |
1,889,923 | HIRE THE BEST CERTIFIED HACKER FOR CRYPTO RECOVERY // CONTACT DIGITAL WEB RECOVERY | Losing a substantial sum of $450,000.00 to a scam is undoubtedly a devastating blow, both... | 0 | 2024-06-16T01:15:04 | https://dev.to/andrea_gardner_da69b19496/hire-the-best-certified-hacker-for-crypto-recovery-contact-digital-web-recovery-191b | Losing a substantial sum of $450,000.00 to a scam is undoubtedly a devastating blow, both financially and emotionally. The sense of shame and humiliation that accompanies such an experience can be overwhelming, leaving one feeling vulnerable and helpless. In times like these, finding a solution to recover lost funds becomes paramount. In my search for assistance, I came across Digital Web Recovery, a reputable recovery service that specializes in helping victims of financial scams reclaim their funds. Initially skeptical, I was encouraged by the numerous success stories shared by others who had been in similar situations. It was reassuring to know that there was hope for recovering what was rightfully mine. Taking the initiative, I reached out to Digital Web Recovery, hoping for a glimmer of light amidst the darkness of my financial despair. The process began with a thorough discussion of my case, where I detailed the circumstances surrounding the scam that had robbed me of $450,333. Despite my initial skepticism, their commitment to helping victims like me quickly put me at ease. After engaging with Digital Web Recovery and entrusting them with my case, I experienced a rollercoaster of emotions – from apprehension to hope and finally, relief. It was surreal when I received confirmation that my funds had been successfully recovered and returned to my account. The weight lifted off my shoulders was immeasurable, and I couldn't help but feel immense gratitude towards Digital Web Recovery for their invaluable assistance. What sets Digital Web Recovery apart is their expertise in financial recovery and unwavering dedication to their clients' well-being. Throughout the process, they provided constant support and guidance, ensuring that I felt informed and empowered every step of the way. Their commitment to transparency and integrity instilled confidence in me, allowing me to place my trust in their capable hands. Moving forward, I am determined to learn from this experience and take proactive measures to safeguard myself against future scams. With the valuable insights and guidance provided by Digital Web Recovery, I am better equipped to recognize and avoid potential threats to my financial security. Their expertise has not only helped me recover my lost funds but has also empowered me to take control of my financial future. In times of adversity, the importance of having a support system cannot be overstated. I am grateful to have had the unwavering support of my loved ones, particularly my wife, who stood by me through thick and thin. Opening up about my experience was not easy, but it strengthened our bond and reaffirmed the importance of trust and communication in our relationship. My experience with Digital Web Recovery has been nothing short of life-changing. Their expertise and unwavering commitment to their clients have restored my faith in humanity and given me hope for the future. To anyone who finds themselves in a similar situation, I wholeheartedly recommend reaching out to Digital Web Recovery for assistance. With their help, recovery is not just a possibility – it's a reality.
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Telegram user; @digitalwebrecovery
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 | andrea_gardner_da69b19496 | |
1,889,922 | [Game of Purpose] Day 28 - ChatGPT to the rescue | Today I wanted to understand what was wrong in my recreation of tutorial I did in Day 27. I thought... | 27,434 | 2024-06-16T01:11:31 | https://dev.to/humberd/game-of-purpose-day-28-chatgpt-to-the-rescue-2fh7 | gamedev | Today I wanted to understand what was wrong in my recreation of tutorial I did in Day 27. I thought maybe it was something with my project, so I created a fresh one and started recreating [tutorial](https://www.youtube.com/watch?v=IT9Rlyy-bSE) created by Continue Breake.
The author created a [companion article](https://continuebreak.com/articles/how-physics-based-helicopter-ue5/) with a more in-depth explanation, which helped, but I still didn't understand everything, so... I asked ChatGPT and it did a very well job. I understood everything I asked.
What is more I just pasted the screenshot with Blueprint nodes and it recognized them and gave a good answer.
At the end I successfully recreated a demo tutorial. Yay! :D
{% embed https://youtu.be/etYpsi5bXLk %}
I also heavily documented the Nodes, so that tomorrow when I wake up I can easily refill my Mental Model.
In the end I am not entirely sure why recreating it in my original project didn't work. Maybe it was that I didn't use helicopter mesh, but a cube? Maybe that I used a PlayerController instead of a Pawn? Or perhaps the mesh wasn't a root node of my PlayerController Blueprint? The last one seems the most likely culprit.
@edit
Does anyone know why the images I paste have max width of 800px in a preview mode? They look like a potato | humberd |
1,889,917 | CONSULT CRYPTO-ALTCOIN RECOVERY EXPERT. | In the high-stakes world of cryptocurrency, where digital coins can vanish in the blink of an eye, a... | 0 | 2024-06-16T00:49:59 | https://dev.to/lincon_reiser_fcad673114b/consult-crypto-altcoin-recovery-expert-4747 | typescript, computerscience, security, linux | In the high-stakes world of cryptocurrency, where digital coins can vanish in the blink of an eye, a new breed of "wizard" hackers has emerged to combat the scourge of stolen Bitcoin. Cyber Genie Hack Pro service, is a cutting-edge cybersecurity solution that uses advanced algorithms and lightning-fast response times to track down and retrieve pilfered crypto assets. When a victim's Bitcoin wallet is compromised and their hard-earned funds disappear into the ether of the blockchain, these digital sorcerers swing into action, leveraging their formidable hacking skills and extensive network of contacts to follow the electronic trail, uncover the thieves' identities, and compel the return of the stolen cryptocurrency. Employing a potent blend of technical wizardry and old-fashioned private investigative tactics, the team deftly navigates the shadowy underworld of crypto crime, deploying a vast arsenal of digital forensics tools and sheer cunning to outwit even the craftiest Bitcoin bandits. For those who have fallen victim to cryptocurrency theft, these modern-day alchemists offer hope, restoring lost funds and a sense of security in the lawless frontier of decentralized finance. With Cyber Genie Hack Pro recovery service, in this case, the days of helplessly watching one's Bitcoin disappear may soon be a thing of the past. My Bitcoin 405,000$ was returned to me through CyberGenie's team's excellent recovery services. I escaped being a victim, you can also. Locate them via:
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 | lincon_reiser_fcad673114b |
1,889,912 | Understanding the Principles of Clean Code | Introduction Clean code is a coding philosophy that aims to make software maintainable,... | 0 | 2024-06-16T00:36:11 | https://dev.to/kartikmehta8/understanding-the-principles-of-clean-code-3pcc | javascript, webdev, programming, tutorial | ## Introduction
Clean code is a coding philosophy that aims to make software maintainable, readable, and easily understandable. It is a set of principles and guidelines that help developers write code that is efficient, understandable, and easy to modify. As software projects grow in size and complexity, it becomes increasingly important to follow clean code principles in order to reduce development time, minimize errors, and enhance the overall quality of the code.
## Advantages of Clean Code
1. **Maintainability:** Writing clean code makes it easier to maintain and update the code in the future. Clean code is well-structured, organized, and follows standard coding practices, making it easier for developers to understand and modify it.
2. **Readability:** Clean code is written in a way that is easy to read and understand, even for someone who did not write the code. This makes it easier for teams to collaborate and for new developers to onboard to a project.
3. **Reusability:** Clean code is modular and follows the principle of code reuse, which means that certain functions or modules can be reused in other parts of the code, reducing the time and effort required in writing new code.
## Disadvantages of Clean Code
1. **Initial Effort:** Writing clean code requires an initial investment of time and effort. Developers need to adhere to certain rules and guidelines, which may slow down the initial development process.
2. **Learning Curve:** Adapting to clean code principles may be a challenge for developers who are used to writing code in their own style. It may take some time to get familiar with the principles and apply them consistently.
## Features of Clean Code
1. **Clear and Meaningful Names:** Clean code uses clear and meaningful names for variables, functions, and classes, making the code self-explanatory.
```python
# Good Example
def calculate_average_score(scores):
return sum(scores) / len(scores)
# Bad Example
def calc(s):
return sum(s) / len(s)
```
2. **Proper Indentation and Formatting:** Clean code follows proper indentation and formatting practices, making the code structure easy to understand and follow.
```python
# Properly indented and formatted
if (condition):
action1()
action2()
else:
alternateAction()
```
3. **Minimum Comments:** Clean code is self-explanatory and does not require the use of excessive comments. Only essential comments are used to clarify complex logic or algorithms.
```python
# Calculate average only if there are elements to avoid division by zero
if len(scores) > 0:
average_score = calculate_average_score(scores)
```
## Conclusion
In conclusion, understanding and following the principles of clean code can greatly enhance the quality of software projects. It not only makes the code more maintainable and reusable, but it also improves collaboration among team members. Adhering to clean code principles may require some initial effort, but the long-term benefits outweigh the disadvantages. By writing clean and efficient code, developers can save time, improve code quality, and ultimately deliver better software products.
| kartikmehta8 |
1,889,911 | Domina JavaScript: Desarrollo Web Avanzado | ¡Hola, amigos! Hoy quiero hablarles sobre un tema que me apasiona y que sé que muchos de ustedes... | 0 | 2024-06-16T00:31:03 | https://dev.to/miguel_angelalmanzamerc/domina-javascript-desarrollo-web-avanzado-424p |
¡Hola, amigos! Hoy quiero hablarles sobre un tema que me apasiona y que sé que muchos de ustedes también adoran: JavaScript. En particular, vamos a profundizar en el desarrollo web avanzado con este lenguaje. Si ya tienes una base en JavaScript y quieres llevar tus habilidades al siguiente nivel, ¡sigue leyendo!
¿Por Qué JavaScript?
JavaScript es el corazón del desarrollo web moderno. Es lo que le da vida a las páginas web, permitiéndote crear experiencias interactivas y dinámicas. Desde la validación de formularios hasta la creación de aplicaciones web completas, JavaScript es esencial.
Fundamentos Sólidos
Antes de entrar en lo avanzado, asegúrate de tener una buena comprensión de los fundamentos: variables, funciones, loops y eventos. Si necesitas repasar, hay montones de recursos en línea que pueden ayudarte. Revisa esta guía básica para refrescar tus conocimientos.
Avanzando: ES6 y Más Allá
El primer paso hacia el desarrollo avanzado es familiarizarse con ES6 (ECMAScript 2015) y las versiones posteriores. Estas versiones de JavaScript introducen características poderosas como:
Arrow Functions: Simplifican la sintaxis de las funciones.
Promesas: Facilitan el manejo de operaciones asíncronas.
Destructuring: Permite extraer datos de arrays y objetos de manera más limpia.
Asincronía en JavaScript
Manejar la asincronía es crucial para el desarrollo web avanzado. Aprender a usar Promesas, async/await y manejar errores asíncronos te permitirá escribir código más eficiente y fácil de entender. Mira este tutorial sobre asincronía para profundizar.
Manipulación del DOM
Para interactuar con los elementos de la página web, necesitas dominar la manipulación del DOM (Document Object Model). Aprende a seleccionar elementos, modificar su contenido y estilos, y a manejar eventos. La biblioteca jQuery puede ser útil aquí, aunque muchas tareas modernas se realizan con Vanilla JS.
Frameworks y Librerías
Para llevar tu desarrollo al siguiente nivel, familiarízate con frameworks y librerías populares:
React: Una librería para construir interfaces de usuario, desarrollada por Facebook. Es muy eficiente y facilita la creación de componentes reutilizables.
Angular: Un framework desarrollado por Google, ideal para aplicaciones de una sola página (SPA).
Vue: Un framework progresivo que es fácil de integrar en proyectos existentes.
Cada uno tiene sus pros y contras, así que explora y elige el que mejor se adapte a tus necesidades. Empieza con React aquí.
Herramientas de Desarrollo
Utilizar herramientas adecuadas puede mejorar enormemente tu flujo de trabajo. Algunas esenciales son:
Node.js: Permite ejecutar JavaScript en el servidor.
Webpack: Un módulo bundler que te ayuda a gestionar y empaquetar tus archivos.
Babel: Un compilador que te permite usar la última versión de JavaScript.
Buenas Prácticas y Testing
Escribir código limpio y mantenible es crucial. Sigue las buenas prácticas como:
Usar nombres de variables descriptivos.
Comentar el código cuando sea necesario.
Mantener funciones cortas y enfocadas.
Además, aprender a escribir tests automatizados con herramientas como Jest o Mocha es una habilidad valiosa que te ayudará a detectar y corregir errores rápidamente. Aprende sobre[ testing aquí.
Proyecto Final
La mejor manera de consolidar tus conocimientos es a través de un proyecto práctico. Crea una aplicación web completa que incorpore todo lo que has aprendido: asincronía, manipulación del DOM, y un framework o librería de tu elección. Este proyecto no solo te dará experiencia práctica, sino que también será una excelente adición a tu portafolio.
Conclusión
Dominar JavaScript a nivel avanzado abrirá un mundo de posibilidades en el desarrollo web. No importa si estás buscando mejorar tus habilidades para un trabajo o simplemente por pasión, invertir tiempo en aprender estas técnicas avanzadas definitivamente valdrá la pena.
¡Buena suerte y feliz codificación!
| miguel_angelalmanzamerc | |
1,889,902 | How to Create a Shortcut for an Application in Ubuntu | Sometimes, when you are new to Ubuntu and need to manually download applications and run them from an... | 0 | 2024-06-16T00:14:05 | https://dev.to/pcabreram1234/how-to-create-a-shortcut-for-an-application-in-ubuntu-39j6 | ubuntu, productivity, beginners, tutorial | Sometimes, when you are new to Ubuntu and need to manually download applications and run them from an executable file, you may wonder how to create a shortcut similar to those in Windows. Here, I will explain how to do it step by step.
## 1. Copy the application folder
First, copy the folder containing your application to the `/opt/` directory with the following command:
`sudo cp -r /path/to/app /opt/`
## 2. Create the `.desktop` file
Check if there is a file with the `.desktop` extension in the copied folder. If not, you will need to create one with the following format:
[Desktop Entry]
Version=1.0
Type=Application
Terminal=false
Name=dbeaver-ce
GenericName=Universal Database Manager
Comment=Universal Database Manager and SQL Client.
Path=/opt/dbeaver/
Exec=/opt/dbeaver/dbeaver
Icon=/opt/dbeaver/dbeaver.png
Categories=IDE;Development
StartupWMClass=DBeaver
StartupNotify=true
Keywords=Database;SQL;IDE;JDBC;ODBC;MySQL;PostgreSQL;Oracle;DB2;MariaDB
MimeType=application/sql
## 3. Explanation of the `.desktop` file
Here is an explanation of each part of this file:
- `[Desktop Entry]`: Indicates that the file follows the desktop entry (`.desktop`) standard, which is used to define shortcuts in graphical desktop environments.
- `Version=1.0`: Specifies the version of the desktop entry file. Not always mandatory, but can be useful.
- `Type=Application`: Defines the type of the entry. In this case, it's an application. Other types can be `Link` or `Directory`.
- `Terminal=false`: Indicates whether the application should run in a terminal. `false` means it's not needed; `true` would open a terminal to run the program.
- `Name=dbeaver-ce`: The name of the application as it will appear in the applications menu.
- `GenericName=Universal Database Manager`: A generic name that describes the type of application. Useful for users unfamiliar with the specific name.
- `Comment=Universal Database Manager and SQL Client.`: A comment that provides a brief description of the application, shown as a tooltip in some desktop environments.
- `Path=/opt/dbeaver/`: The working directory where the application will run. This can be useful if the application needs to run from a specific directory.
- `Exec=/opt/dbeaver/dbeaver`: The command to run the application. Specifies the full path to the DBeaver executable.
- `Icon=/opt/dbeaver/dbeaver.png`: The path to the icon file used to represent the application in the menu and dock.
- `Categories=IDE;Development`: The categories to which the application belongs. Helps to classify it correctly in the applications menu.
- `StartupWMClass=DBeaver`: The name of the main window class of the application. Useful for the desktop environment to correctly associate the window with the shortcut.
- `StartupNotify=true`: Indicates whether to show a startup notification when launching the application.
- `Keywords=Database;SQL;IDE;JDBC;ODBC;MySQL;PostgreSQL;Oracle;DB2;MariaDB`: Keywords that help users search for the application in the menu.
- `MimeType=application/sql`: The MIME types that the application can handle. Useful for associating the application with certain file types.
## 4. Copy the `.desktop` file to the correct location
Copy the `.desktop` file to the `/home/username/.local/share/applications` directory with the following command:
`sudo cp /opt/application/application.desktop /home/username/.local/share/applications`
## 5. Assign execution permissions
Finally, give the necessary permissions to the newly copied `.desktop` file with the command:
`chmod +x ~/.local/share/applications/application.desktop`
## Conclusion
By following these steps, you will have created a shortcut in Ubuntu to easily locate and open your applications. This will allow you to work more efficiently and have your favorite tools always at hand.
| pcabreram1234 |
1,890,436 | Authenticated Requests From Shopify UI Extensions | Shopify has a notion ofCheckout UI extensions. These provide hooks, or targets, to write custom user... | 0 | 2024-06-28T17:32:26 | https://blog.waysoftware.dev/blog/authenticated-requests-from-shopify-ui-extensions/ | ---
title: Authenticated Requests From Shopify UI Extensions
published: true
date: 2024-06-16 00:00:00 UTC
tags:
canonical_url: https://blog.waysoftware.dev/blog/authenticated-requests-from-shopify-ui-extensions/
---
Shopify has a notion of[Checkout UI extensions](https://shopify.dev/docs/api/checkout-ui-extensions). These provide hooks, or targets, to write custom user experiences during the checkout flow. For my Shopify app,[File Vault Pro](https://filevaultpro.co/), users are able to associate files with specific products and variants. I needed to leverage UI extensions to provide download access during the checkout experience. There would be two targets for my use case, the "Thank You" and "Order Status" pages. This guide will focus on how to make an authorized request from an extension directly to your API. Creating and configuring an extension is beyond the scope of this guide, but there is plenty of documentation to do so. This guide also assumes an app created with the shopify remix template.
## Configuration
The extensions run in a sandboxed environment and need to be given a couple of permissions. First, from within your partners dashboard, select the app you are developing. From there, select the "API Access" tab. Scroll down and make sure to enable the "Allow network access in checkout and account UI extensions" section. Within your `shopify.extension.toml` file, make sure to uncomment the line marked `network_access = true`. This gives your extension the "capability" to make network requests.
## Obtain Token
From within the code of your extension, grab the session token with the hook `useSessionToken`. Make sure that the import path is correct. For example, for the "Order Status" page, the import path is "@shopify/ui-extensions-react/customer-account". Consult the documentation to ensure you are using the correct import path given your target. Now that you have verified that you can get the session token on the client side, it's time to move towards the server.
## Server
In my stack, the Remix app serves as a Backend for Frontend (BFF) with the main application code running in a separate service. Instead of proxying the request through the Remix app, I opted to go directly to the backend API. This involves a couple of steps:
1. From the partner dashboard, select the app and grab the client secret. Add this as an environment variable to your server. This will be used to verify the incoming JWT passed from the extension.
2. This will vary depending on your server, but the gist is that you will want to verify the JWT for any of the routes that you've created for the extension to consume. This will likely take the form of some sort of middleware. Follow[the instructions](https://shopify.dev/docs/apps/build/authentication-authorization/session-tokens/set-up-session-tokens#verify-the-session-tokens-signature)to validate the JWT. It is highly recommended to find a JWT validation library to help with this process. I am using Elixir's [Joken](https://hexdocs.pm/joken/readme.html) library which greatly simplifies this. Consult [JWT.io](https://jwt.io/libraries) to identify a language specific library for you.
3. CORS - you'll also need to enable CORS for the given routes that you are exposing to the extension. These will have a dynamic origin, so origin cannot be depended upon fully as is for CORS configuration.
## Integration
Test. At this point, if everything is configured correctly, you should be able to make an authenticated request to your API from the extension. Within the extension code, make a `fetch`request passing in the session token as an authorization header.
```
let res = await fetch(`URL`, {
headers: {
Authorization: `Bearer ${token}`,
},
mode: 'cors',
});
```
## Alternatives
I haven't explored these options, but I think that you should be able to call the Remix backend in a similar manner. I would guess but have not verified that an app created with the CLI is likely configured to automatically verify the JWT. I believe that an[App Proxy](https://shopify.dev/docs/api/shopify-app-remix/v2/authenticate/public/app-proxy) could also be a viable option here, but have not explored these in depth. | johnmcguin | |
1,889,822 | Introducing Cart: Simplifying Shopping Cart Management for Laravel | In the fast-paced world of e-commerce, efficient shopping cart management isn't just essential—it's a... | 0 | 2024-06-16T00:00:00 | https://dev.to/realrashid/introducing-cart-simplifying-shopping-cart-management-for-laravel-28ek | laravel, cart, shopping, php |
In the fast-paced world of e-commerce, efficient shopping cart management isn't just essential—it's a competitive advantage. Today, I'm thrilled to unveil **Cart**, a powerful Laravel package designed to streamline and elevate your online retail experience.
### Why Cart Matters
Effective cart management is crucial for any successful e-commerce venture. Whether you're running a small boutique shop or a large-scale marketplace, seamless cart operations can significantly impact your customer's shopping journey. Cart acts as your trusted ally, offering a robust set of features tailored specifically for Laravel applications.
### Unveiling Key Features
1. **Flexible Configuration**
Cart allows you to customize each cart instance with specific tax rates, configurations, and business rules tailored to your unique needs. Whether managing different tax jurisdictions or implementing promotional discounts, Cart adapts effortlessly to your business requirements.
2. **Multiple Instances Management**
With Cart, you can define and manage multiple cart instances within a single Laravel application. This capability is particularly valuable for scenarios requiring separate carts for different user sessions, order types, or temporary storage.
3. **Dynamic Tax Calculation**
Tax rules can vary based on location, product type, or customer category. Cart empowers you to enable or disable tax calculations on a per-instance basis, ensuring compliance and flexibility in tax handling across diverse markets.
4. **Intuitive API Integration**
Seamlessly integrate Cart into your Laravel application with its intuitive API. Whether adding products, updating quantities, or retrieving cart details, the API simplifies interactions and enhances development efficiency.
5. **Extensive Documentation and Support**
Navigating a new package can be daunting, but Cart provides comprehensive documentation that guides you through installation, configuration, and advanced usage scenarios. Additionally, our dedicated support ensures you're supported throughout your journey with Cart.
### Getting Started with Cart
#### Installation
Getting started with Cart is straightforward. Begin by installing the package via Composer:
```bash
composer require realrashid/cart
```
Next, publish Cart's configuration and other necessary assets:
```bash
php artisan cart:install
```
#### Basic Usage
Once installed, using Cart is as simple as including its facade in your Laravel controllers or services. Here's a quick example of adding an item to the cart:
```php
use RealRashid\Cart\Facades\Cart;
// Add a product to the cart
Cart::add(1, 'Sample Product', 2, 25.00, ['size' => 'M', 'color' => 'Blue'], 10);
```
#### Advanced Features
Explore Cart's advanced features like updating item details, calculating taxes, managing multiple cart instances, and more. Dive deeper into our documentation to harness the full potential of Cart for your business.
### Support and Contribution
Cart is open-source software licensed under the MIT License. We welcome contributions from the community to enhance Cart's capabilities and ensure it meets the evolving needs of Laravel developers worldwide.
### Show Your Support on ProductHunt!
[](https://www.producthunt.com/posts/cart-simplifying-cart-for-laravel?embed=true&utm_source=badge-featured&utm_medium=badge&utm_souce=badge-cart-simplifying-cart-for-laravel)
### Conclusion
In conclusion, Cart is more than just a package—it's a solution designed to optimize your Laravel-powered e-commerce platform. Whether you're a developer streamlining cart management or a business owner aiming to enhance customer satisfaction, Cart provides the tools and flexibility you need.
Ready to transform your shopping cart experience? Get started with [Cart today](https://github.com/realrashid/cart) and discover a new level of efficiency and control in managing your online store.
If you find Cart helpful and would like to support my work, you can [buy me a coffee](https://www.buymeacoffee.com/realrashid). Your support keeps this project alive and thriving.
Thank you for being part of this journey.
Warm regards,
Rashid Ali | realrashid |
1,889,901 | SQL | SQL, or Structured Query Language, is a powerful programming language used primarily for managing and... | 0 | 2024-06-15T23:50:26 | https://dev.to/devincb93/sql-533b | SQL, or Structured Query Language, is a powerful programming language used primarily for managing and manipulating databases. It's an invaluable tool for inserting, modifying, and even deleting data within databases.
Recently, I embarked on a project to create a simple Library database system. This project highlighted the critical role SQL plays in database management. Without SQL, it wouldn't have been possible to efficiently handle the various data operations needed for the system. During my journey, I faced a few challenges when learning SQL—because who doesn't have trouble when they first start learning something?
The main issue I encountered was surprisingly related to using ORM (Object-Relational Mapping) methods. I kept trying to create new functions for methods that were already available in the ORM. It was like reinventing the wheel without realizing the tools already at my disposal. Once I took a step back and thought, "Why am I doing this?" I immediately started to see the true power in SQL and ORM. The 'Aha' moment finally clicked. My project suddenly became much easier to manage and create. I never knew it could be this easy; honestly, I wished I had figured it out sooner.
**What are ORM Methods?**
Object-Relational Mapping is a technique software developers use to interact with databases using their preferred programming language. In my case, it's Python. Instead of having to write redundant code, like the snippet below:
```
def grab_authors():
authors = []
for author in Author.all_authors:
if author.name not in authors:
authors.append(author.name)
return authors
```
ORM bridges the gap between writing such repetitive code and being able to easily manipulate a database with simple methods. Developers can use these methods to create, read, update, and delete functions effortlessly. Let's break down CRUD, which stands for 'create, read, update, and delete', below:
**Create Operation**
The create operation simplifies the process of adding new objects or items to the database. With the power of SQL's 'INSERT' commands, ORM makes it easier and more efficient to manage databases. In many ORMs, the objects or items can be saved to the database using the save() method, which consists of the create operation.
**Read Operation**
The read operation consists of methods like get(), filter(), and all(). These methods make retrieving objects easier. For example, get() allows us to grab a single object based on a criterion; in the case below, it would be the name of the author:
```
author = Author.get(name="Christopher Paolini")
return author
```
The filter() method lets us retrieve objects based on certain criteria and can return more than one object. Suppose we have a library of books associated with our authors, and we want to grab all the books that have the ID connected to a specific author:
```
books_written = Book.filter(author_id=2)
return books_written
```
This code would return all the books with the author_id of 2, which we will say is Christopher Paolini.
**Update Operation**
The update operation helps update or modify existing data in the database. It is straightforward and typically involves retrieving the object, changing its attributes, and saving the changes.
**Delete Operation**
The delete operation is used for removing objects from the database. For example, we can first filter the author we want to delete:
```
filtered_author = Author.filter(id=1)
```
Then, we use the delete operation to remove it from our database:
```
Author.delete(filtered_author)
```
**Conclusion**
CRUD operations make managing databases much simpler, and I've gained a deeper appreciation for SQL and its capabilities. SQL simplifies complex data manipulations, making it easier to work with databases. It allows for powerful querying capabilities that streamline the handling of large datasets, which is crucial and useful for making tasks easier in the long run.
If you're working on any project involving data, mastering SQL is a game-changer. I hope someone out there finds this interesting and starts dabbling with SQL themselves.
| devincb93 | |
1,889,898 | Coding Standards in the Software Industry: A Focus on Ruby | Introduction to Coding Standards 📚 In the dynamic and ever-evolving realm of software... | 0 | 2024-06-15T23:46:16 | https://dev.to/davidmrtz-dev/coding-standards-in-the-software-industry-a-focus-on-ruby-n6a | codingstandards, ruby, softwaredevelopment, engineering | ## Introduction to Coding Standards 📚
In the dynamic and ever-evolving realm of software development, coding standards stand as a cornerstone, guiding developers towards crafting maintainable, readable, and robust codebases.
These established guidelines dictate the structure, formatting, and overall style of code, ensuring consistency and facilitating seamless collaboration among developers.
Embracing coding standards not only elevates the quality of the code but also streamlines the development process, fostering a culture of shared understanding and minimizing the potential for errors.
This post delves into the profound significance of coding standards in the software industry, with a particular focus on their application in Ruby development.
By examining the rationale behind these standards, exploring prevalent conventions, and showcasing practical examples, we aim to illuminate their crucial role in fostering high-quality software development.
## The Compelling Case for Coding Standards 🔎
Coding standards transcend mere aesthetics, offering a multitude of benefits that permeate the very fabric of software development.
Their implementation fosters a cohesive and consistent codebase, enhancing its readability and maintainability.
As developers navigate through the code, they are presented with a familiar and structured environment, reducing the cognitive burden associated with deciphering unfamiliar coding styles.
This, in turn, expedites the debugging and troubleshooting process, enabling developers to swiftly identify and rectify issues.
Furthermore, coding standards promote collaboration and teamwork within development teams.
By establishing a common language and set of guidelines, developers can seamlessly integrate their contributions, ensuring that the codebase remains cohesive and well-organized.
This collaborative approach fosters knowledge sharing and reduces the risk of introducing inconsistencies or conflicts.
## The Role of Coding Standards in Ruby Development 💎
The Ruby programming language, renowned for its elegance and expressiveness, also adheres to a set of well-defined coding standards.
These guidelines, meticulously crafted by the Ruby community, aim to promote consistency, readability, and maintainability across Ruby codebases.
One of the fundamental tenets of Ruby coding standards is the emphasis on indentation.
Ruby utilizes spaces for indentation, typically two spaces per level, to visually delineate code blocks and enhance its readability.
This consistent indentation scheme fosters a clear understanding of the code's structure and flow, enabling developers to quickly grasp the relationships between different code segments.
## Beyond Aesthetics: The Far-Reaching Benefits of Coding Standards ✨
🔮 **More consistent**: Uniform coding practices ensure a consistent codebase, which is vital when multiple developers work on the same project.
🔮 **More Readable**: Consistent indentation, meaningful naming conventions, and well-structured code blocks make it easier for developers to understand and navigate the codebase,
saving time and effort during code reviews and maintenance tasks.
🔮 **More Maintainable**: Well-formatted code is easier to modify and extend, reducing the likelihood of introducing errors and facilitating future enhancements.
This maintainability not only saves time but also ensures the codebase remains adaptable to evolving requirements.
🔮 **Less Prone to Errors**: Consistent coding conventions minimize the potential for syntax errors and logical mistakes, leading to cleaner, more reliable code.
This reduction in errors translates to fewer bugs, improved application stability, and a more positive user experience.
🔮 **Enhanced Collaboration**: Shared coding standards foster a common language among developers, enabling seamless collaboration and knowledge sharing.
This collaborative approach streamlines the development process, reduces conflicts, and promotes a sense of ownership among team members.
🔮 **More efficient**: Adhering to standards can streamline the development process, as developers spend less time understanding code written by others.
## Practical Applications of Coding Standards in Ruby ⚙️
Ruby is renowned for its elegant syntax and readability. Adhering to coding standards enhances these attributes. Below are some widely accepted Ruby coding standards:
### Naming Conventions - Classes and Modules
Class and module names should be written in CamelCase, starting with an uppercase letter.
```python
class MyClass
end
module MyModule
end
```
### Naming Conventions - Methods and Variables
Method and variable names should be written in snake_case, all in lowercase with words separated by underscores.
```python
def my_method
end
my_variable = 10
```
### Indentation
Use two spaces per indentation level. Avoid using tabs as they can be rendered differently in various editors.
```python
def my_method
if some_condition
do_something
else
do_something_else
end
end
```
### Line Length
Keep lines to a maximum of 80 characters. This promotes readability and helps prevent horizontal scrolling.
```python
# Good
def calculate_area(length, width)
length * width
end
# Bad
def my_long_method_with_a_descriptive_name(arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8)
# Method body here
end
```
### Method Definitions
Avoid defining methods with more than one or two parameters. If a method requires multiple parameters, consider using a hash to pass them.
```python
# Good
def create_user(name:, age:, email:)
# method implementation
end
# Bad
def create_user(name, age, email)
# method implementation
end
```
### String Literals
Use single quotes for string literals unless you need string interpolation or special symbols.
```python
# Good
name = 'John Doe'
# Bad
name = "John Doe"
# Interpolation
greeting = "Hello, #{name}!"
```
### Blocks and Lambdas
Prefer the `do...end` syntax for multiline blocks and `{}` for single-line blocks.
```python
# Multiline block
[1, 2, 3].each do |number|
puts number
end
# Single-line block
[1, 2, 3].each { |number| puts number }
```
Use lambda for anonymous functions and -> for concise syntax.
```python
# Good
my_lambda = ->(x) { x * 2 }
# Bad
my_lambda = lambda { |x| x * 2 }
```
### Comments and Documentation
Use comments judiciously to explain the why behind the code, not the what. Ensure that comments are up-to-date and reflect the current state of the code.
```python
# Good
# This method calculates the area of a rectangle
def calculate_area(length, width)
length * width
end
# Bad
# Calculate the area
def calculate_area(length, width)
length * width
end
```
Use RDoc or other documentation tools to generate detailed documentation for your classes and methods.
```python
# Good
# Calculates the area of a rectangle.
#
# @param length [Integer] The length of the rectangle.
# @param width [Integer] The width of the rectangle.
# @return [Integer] The area of the rectangle.
def calculate_area(length, width)
length * width
end
```
### Error Handling
Handle errors gracefully using exceptions. Ensure that errors are logged appropriately and provide meaningful messages to the users.
```python
# Good
def divide(x, y)
raise 'Division by zero error' if y == 0
x / y
rescue => e
puts e.message
end
# Bad
def divide(x, y)
x / y
end
```
## Conclusion 🔖
Coding standards serve as an invaluable tool in the software development arsenal, particularly in the realm of Ruby programming.
By adhering to established guidelines, developers can craft code that is not only functional but also maintainable, readable, and collaborative.
The benefits of coding standards extend far beyond aesthetics, encompassing enhanced code quality, reduced development time, and improved team productivity.
As the software industry continues to evolve, embracing coding standards will remain paramount in fostering the creation of robust, scalable, and enduring software solutions.
## Key Takeaways 💡
🔺 **Consistent coding standards** enhance code quality, readability, and maintainability.
🔺 **Ruby coding standards** emphasize indentation, naming conventions, and readability.
🔺 **Adhering to coding standards** fosters collaboration, reduces errors, and streamlines development.
🔺 **Practical applications** of coding standards in Ruby include naming conventions, indentation, line length, and error handling.
By embracing coding standards as a guiding principle in software development, developers can navigate the complexities of code with clarity, confidence, and cohesion,
ultimately paving the way for the creation of exceptional software solutions.
🚀 **Keep coding, keep creating, and keep innovating!** 🚀
## References
- [Ruby Style Guide](https://rubystyle.guide/)
- [Ruby Coding Standards](https://www.ruby-lang.org/en/community/ruby-coding-style-guide/)
- [The Art of Readable Code](https://www.amazon.com.br/Art-Readable-Code-Practical-Techniques/dp/0596802293)
- [Clean Code: A Handbook of Agile Software Craftsmanship](https://www.amazon.com.br/Clean-Code-Handbook-Software-Craftsmanship/dp/0132350882)
- [RuboCop](https://rubocop.org/) | davidmrtz-dev |
1,889,896 | Urgent Hiring Python Expert | Hi, I am currently looking for Python Expert who can join to our team. The candidates must have over... | 0 | 2024-06-15T23:26:12 | https://dev.to/eugene_goodwin_c9d195b96d/urgent-hiring-python-expert-1c48 | python, ai, aws, webdev | Hi, I am currently looking for Python Expert who can join to our team.
The candidates must have over 8 years of experience with python.
https://docs.google.com/document/d/19W0x0fed3yIyLBFg6Hh0_i4MSlF1ZCOk6CrCAscfeCU/edit
Please check this link. | eugene_goodwin_c9d195b96d |
1,889,895 | Luz que me ilumina o caminho e que me ensina a viver... | A post by Miguel Samori | 0 | 2024-06-15T23:22:36 | https://dev.to/miguelsam/luz-que-me-ilumina-o-caminho-e-que-me-ensina-a-viver-4lok | miguelsam | ||
1,889,892 | SQLynx - The Ultimate Web-Based SQL IDE for Developers and Data Analysts | SQLynx is a cutting-edge web-based SQL Integrated Development Environment (IDE) designed for... | 0 | 2024-06-15T23:14:42 | https://dev.to/concerate/sqlynx-the-ultimate-web-based-sql-ide-for-developers-and-data-analysts-1nl1 | SQLynx is a cutting-edge web-based SQL Integrated Development Environment (IDE) designed for developers and data analysts.
It supports multiple databases, including Mysql，PostgreSQL, Oracle and features an intelligent code editor with syntax highlighting, code completion, and refactoring capabilities.
SQLynx's modern web interface ensures cross-platform compatibility (MacOS, Windows, Linux), making it user-friendly and easy to configure. This powerful tool simplifies SQL editing and enhances productivity for users managing complex database tasks.
For more information, visit the SQLynx website http://www.sqlynx.com/en/#/home/probation/SQLynx
| concerate | |
1,889,890 | Mase JS is a new way to write HTML entirely in your JavaScript. | Introducing Mase JS a new way to write and structure html entirely inside your JavaScript. Also... | 0 | 2024-06-15T22:52:32 | https://dev.to/greenestgoat/mase-js-is-a-new-way-to-write-html-entirely-in-your-javascript-bd8 | webdev, javascript, programming, html | 
Introducing Mase JS a new way to write and structure html entirely inside your JavaScript. Also leaving a small footprint on your website as the library comes in at only 800 bytes in size. it uses a custom JSON like format that converts JavaScript to html on the frontend.
Planned:
Server side / Backend rendering with nodejs or express.
plugin support.
check out the [GitHub ](https://github.com/masejs/masejs)to get started, also a star would be awesome, if you find an error or wanna ask me a question have a look at our [Discord ](https://discord.gg/hrjsfuXu)server.
## Installation
### CDN
Import Mase JS using CDN.
```js
import { MaseJSInterpreter } from 'https://cdn.jsdelivr.net/npm/masejs';
```
#### 🚧 Specific Version
```js
import { MaseJSInterpreter } from 'https://cdn.jsdelivr.net/npm/masejs@latest';
```
### NPM
Install Mase JS using [npm and node](https://nodejs.org/en).
```bash
npm install masejs
```
## Import
Import Mase JS definitions from `MaseJSInterpreter`.
`index.js`
```js
import { MaseJSInterpreter } from 'masejs';
MaseJSInterpreter.interpret(masejs);
```
## Usage
Use the tree structure in your Javascript. That's it 🎉.
`script.js`
```js
import { MaseJSInterpreter } from 'https://cdn.jsdelivr.net/npm/masejs@latest';
const masejs = {
div: {
center: 'true',
class: 'button-container',
styles: {
height: '100%',
width: '100%',
inset: '0px',
position: 'fixed',
},
button: [
{
value: 'Click me',
styles: {
color: 'white',
'background-color': '#000000',
outline: 'none',
border: 'none',
height: '38px',
width: '88px',
'border-radius': '5px',
cursor: 'pointer',
},
class: 'button',
id: 'button',
events: {
click: () => alert('Button clicked!')
},
}
]
}
};
MaseJSInterpreter.interpret(masejs);
```
## Examples
* A basic form with [MaseJS](https://codepen.io/GreenestGoat/pen/zYQEjML).
* A simple sidebar with [MaseJS](https://codepen.io/GreenestGoat/pen/qBGVxbv).
* Using the library with [Material UI](https://codepen.io/GreenestGoat/pen/GRaMLXR?editors=1010). | greenestgoat |
1,889,889 | Web3 in Hospitality: Transforming the Industry | Introduction The hospitality industry is undergoing a significant transformation thanks... | 27,673 | 2024-06-15T22:51:40 | https://dev.to/rapidinnovation/web3-in-hospitality-transforming-the-industry-37fn | ## Introduction
The hospitality industry is undergoing a significant transformation thanks to
technological advancements. Web3, the third generation of the internet, is
playing a pivotal role in reshaping the sector by enhancing customer service,
streamlining operations, and ensuring secure transactions.
## What is Web3?
Web3 represents the next evolution of the internet, focusing on
decentralization, user privacy, and data ownership. Built on blockchain
technology, it enables the creation of decentralized applications (DApps) and
smart contracts, enhancing security and reducing data breaches.
## How Web3 Transforms the Hospitality Industry
### Enhanced Customer Experience
Web3 technologies personalize and streamline services, offering tailored
experiences based on individual preferences and past behaviors. Seamless
transactions through cryptocurrencies and smart contracts further enhance the
customer experience.
### Improved Security and Transparency
Blockchain's decentralized nature ensures data security and transparency,
reducing fraud and unauthorized transactions. Smart contracts automate service
agreements, enhancing trust between guests and service providers.
### Personalization Through Data
Leveraging customer data, businesses can offer personalized experiences,
boosting satisfaction and loyalty. Advanced algorithms and machine learning
predict future behaviors, enabling tailored recommendations and services.
## Types of Web3 Applications in Hospitality
### Decentralized Booking Platforms
These platforms eliminate intermediaries, reducing costs and enhancing
transparency. An example is Travala, which uses blockchain to offer a
decentralized travel booking marketplace.
### Loyalty and Rewards Programs
Blockchain-based loyalty programs offer transparent, secure, and easily
redeemable rewards, enhancing customer engagement and satisfaction.
### Identity Verification Systems
Blockchain and biometric technologies revolutionize identity verification,
enhancing security and speeding up processes, particularly in high-traffic
environments like hotels and airports.
## Benefits of Implementing Web3 in Hospitality
### Increased Trust and Customer Loyalty
Web3 technologies build trust through transparent business practices and
secure transactions, fostering customer loyalty and turning customers into
brand advocates.
### Cost Reductions and Increased Efficiency
Automation and digital platforms reduce labor and IT costs, while lean
management techniques minimize waste and improve productivity.
### Access to Global Markets
Digital technology enables businesses to reach a global audience, tapping into
new customer bases and benefiting from economies of scale.
## Challenges of Web3 in Hospitality
### Technological Complexity
Integrating Web3 technologies requires a significant shift in understanding
and infrastructure, adding layers of complexity and potential costs.
### Regulatory Uncertainties
The decentralized nature of blockchain technology does not fit neatly within
traditional regulatory frameworks, leading to compliance challenges.
### Integration with Existing Systems
Ensuring seamless interoperability between Web3 technologies and legacy
systems is crucial for smooth operations and customer satisfaction.
## Real-World Examples of Web3 in Hospitality
### Case Study: Decentralized Hotel Booking
LockTrip is a blockchain-based travel marketplace that allows hotels to list
rooms directly, reducing costs and enhancing booking security.
### Case Study: Blockchain-based Loyalty Programs
Singapore Airlines' KrisFlyer program uses blockchain to create a digital
wallet, enhancing the utility of loyalty points and improving customer
engagement.
## Future of Web3 in Hospitality
### Predictions and Trends
Increased adoption of blockchain for identity verification and security, rise
of tokenization, and more partnerships between hospitality businesses and
technology providers.
### Evolving Customer Expectations
Modern customers expect transparency, personalization, and convenience,
driving the demand for Web3 technologies.
### Technological Advancements
Innovations in blockchain, AI, and IoT enhance the capabilities of
decentralized applications, offering more personalized and engaging user
experiences.
## Why Choose Rapid Innovation for Web3 Implementation and Development
### Expertise in AI and Blockchain
Rapid Innovation offers expertise in AI and blockchain, providing robust
solutions that enhance transparency, security, and efficiency.
### Proven Track Record with Industry Leaders
With a proven track record, Rapid Innovation ensures reliability and
expertise, managing large-scale projects and meeting industry standards.
### Customized Solutions for Unique Business Needs
Rapid Innovation offers tailored solutions that address specific business
challenges, ensuring alignment with business goals and processes.
## Conclusion
### Summary of Web3 Benefits in Hospitality
Web3 technologies enhance customer experience, streamline operations, and
ensure secure transactions, revolutionizing the hospitality industry.
### Encouragement to Embrace Digital Transformation
Embracing Web3 technologies offers significant competitive advantages.
Investing in training and partnering with tech firms can help businesses stay
ahead of the curve.
Drive innovation with intelligent AI and secure blockchain technology! 🌟 Check
out how we can help your business grow!
[Blockchain App Development](https://www.rapidinnovation.io/service-
development/blockchain-app-development-company-in-usa)
[Blockchain App Development](https://www.rapidinnovation.io/service-
development/blockchain-app-development-company-in-usa)
[AI Software Development](https://www.rapidinnovation.io/ai-software-
development-company-in-usa)
[AI Software Development](https://www.rapidinnovation.io/ai-software-
development-company-in-usa)
## URLs
* <https://www.rapidinnovation.io/post/web3-in-hospitality>
## Hashtags
#Web3
#HospitalityInnovation
#BlockchainTechnology
#DecentralizedApps
#SmartContracts
| rapidinnovation | |
1,888,889 | CYPRESS-AJV-SCHEMA-VALIDATOR Plugin: The Brave Vigilante for Your API Contracts | Seamlessly Validate Your APIs Against Well-Documented Schemas from Swagger and Other API Tools and... | 27,209 | 2024-06-15T22:47:53 | https://dev.to/sebastianclavijo/cypress-ajv-schema-validator-plugin-the-brave-vigilante-for-your-api-contracts-5cfe | cypress, qa, automation, testing | **Seamlessly Validate Your APIs Against Well-Documented Schemas from Swagger and Other API Tools and Standards**
_(Cover image from pexels.com by Picography)_
---
- [ACT 1: EXPOSITION](#act-1-exposition)
- [ACT 2: CONFRONTATION](#act-2-confrontation)
- [Contract Testing: Laying Down the Law](#contract-testing-laying-down-the-law)
- [About JSON Schemas and Schema Documents: The Rulebook](#about-json-schemas-and-schema-documents-the-rulebook)
- [The Trusty Sidekick: The Ajv JSON Schema Validator](#the-trusty-sidekick-the-ajv-json-schema-validator)
- [The new Vigilante on the block: The CYPRESS-AJV-SCHEMA-VALIDATOR Plugin](#the-new-vigilante-on-the-block-the-cypress-ajv-schema-validator-plugin)
- [ACT3: RESOLUTION](#act3-resolution)
---
### ACT 1: EXPOSITION
Imagine you hire a contractor to renovate your home. You agree on work and price, documenting everything in a **contract**. But the contractor uses lower-quality materials and skips renovations. The contract is breached.
What do you do? Obviously, you need a brave fighter for justice—a fearless vigilante—to put that unscrupulous individual in their place. 🙂
Now, think of your API. The **API schema** is your contract. If the backend delivers unexpected data, you need a competent guardian to fight for your rights and point out all those unjust violations that blindsided you. That’s where a **Schema Validator** comes in to help you enforce your rights.
When I was creating my first API tests, unfortunately, many of the tests suddenly failed from one day to the next. Why now? I had to dig through those tests, debugging them and figuring out what could have gone wrong: Was it the test? Was the app changed? Was the data changed?
In my opinion, **one of the most common reasons why web applications fail (if not the most common) is due to unexpected, uninformed, or undocumented changes in the API**. Quite often, the 'QA guy' is the last to know about these changes; however, he is the one who has to sign off on the release. Counterintuitive, right?
That's why API testing exists alongside end-to-end (E2E) testing. One of the most common practices (again... if not the most common) when testing a specific API endpoint is to include assertions over the response to verify that the data obtained has a certain structure or design. Assertions like: this property is of type string, or that other property is an array of integers, the value is not null and is within a min and max range, or the property is present in the response, and so on.
Consequently, our tests for validating the correctness of the data structure in the response end up having quite a large number of lines of code, which we need to change when there are changes in the API. If you have, let's say, 100 tests just for one of your APIs, the time spent on maintenance will be considerable, especially if the API specification is still under development.
However, numerous organizations have well-documented backend APIs using tools like Swagger, following well-defined standard formats such as OpenAPI. Many of these organizations also do a fairly good job of updating these schemas regularly.
**So why don't we use these schemas to validate the contract between our backend services and our frontend application? We can use these Schema Validators in our API tests to monitor and flag any injustice inflicted on our beloved API—just like a brave Vigilante.**
---
### ACT 2: CONFRONTATION
#### Contract Testing: Laying Down the Law
But before we get too far ahead of ourselves, let's understand a little bit about what **_Contract Testing_** is.
Contract Testing is an approach in software testing where the interactions between different services are tested based on the contract they agree upon. A contract specifies the expected inputs and outputs for a service, ensuring that different components interact correctly and reliably.
There are two main approaches to contract testing: Consumer-Driven Contract Testing and Producer-Driven Contract Testing. The key difference between them lies in who defines the contract.
- **Consumer-Driven Contract Testing** focuses on the needs of the consumer. The contract is defined by the consumers of the API, dictating what they expect from the provider. One of the most popular tools for this approach is Pact. Pact, and specifically PactJS, is a powerful tool that allows consumers to create contracts that providers can then verify, ensuring that their APIs meet consumer expectations.
- **Producer-Driven Contract Testing**, on the other hand, is where the provider defines the contract. This approach is often centered around schema validation. Producers outline the structure and constraints of the data they will provide, ensuring that consumers handle it correctly. Schema validation tools, such as Ajv, are crucial in this approach as they verify that the responses adhere to the predefined schema.
By leveraging these two methods, teams can ensure more robust and reliable communication between API producers and consumers, significantly reducing the risk of integration issues.
#### About JSON Schemas and Schema Documents: The Rulebook
Let's clarify a couple of key components that we'll be discussing throughout this post:
- **JSON Schema**: It is a hierarchical, declarative language that describes and validates JSON data.
```json
{
"title": "User",
"type": "object",
"properties": {
"id": {
"type": "integer"
},
"name": {
"type": "string"
},
"address": {
"type": "object",
"properties": {
"city": {
"type": "string"
},
"zipCode": {
"type": "string"
}
},
"required": ["city", "zipCode"]
}
},
"required": ["id", "name", "address"]
}
```
- **OpenAPI 3.0.1 and Swagger 2.0 Schema Documents**: The OpenAPI Specification (formerly Swagger Specification) are schema documents to describe your entire API (in JSON format or XML format). So a schema document will contain multiple schemas, one for each supported combination of _Endpoint - Method - Expected Response Status_ (also called _path_) by that API.
```json
{
"openapi": "3.0.1",
"info": {
"title": "User API",
"version": "1.0.0"
},
"paths": {
"/users/{id}": {
"get": {
"summary": "Get a user by ID",
"parameters": [
{
"name": "id",
"in": "path",
"required": true,
"schema": {
"type": "integer"
}
}
],
"responses": {
"200": {
"description": "User details",
"content": {
"application/json": {
"schema": {
"$ref": "#/components/schemas/User"
}
}
}
},
"401": {
"description": "Unauthorized"
}
}
}
}
},
"components": {
"schemas": {
"User": {
"type": "object",
"properties": {
"id": {
"type": "integer"
},
"name": {
"type": "string"
},
"address": {
"type": "object",
"properties": {
"city": {
"type": "string"
},
"zipCode": {
"type": "string"
}
},
"required": ["city", "zipCode"]
}
},
"required": ["id", "name", "address"]
}
}
}
}
```
For the JSON above, an example of path would be: **"/users/{id}**" - "**get**" - "**200**".
#### The Trusty Sidekick: The Ajv JSON Schema Validator
AJV (Another JSON Schema Validator) is a JavaScript library that validates data objects against a JSON Schema structure ([Ajv official website](https://ajv.js.org/)).
Don’t be fooled by its name—it’s not just another schema validator. AJV is an fantastic tool!
In my opinion, **AJV** is a very **versatile**, **powerful**, **fast**, and **well-maintained** JSON Schema validator. On top of that, it has **excellent documentation**.
But no matter how amazing a Vigilante might be, they all have their weaknesses.
##### Setbacks I Experienced Using Ajv Schema Validator Out of the Box
Although Ajv is a plugin that's fairly easy to integrate into your Cypress frameworks, when I implemented schema validation for OpenAPI and Swagger using Ajv for a large number of APIs across multiple Cypress projects, I encountered a few setbacks:
1. The APIs to test were documented with the Swagger tool in OpenAPI 3.0.1 or Swagger 2.0 schema documents, each containing the full specification of the API (endpoints, methods, expected result statuses). However, Ajv requires the specific JSON schema object of the response to validate, so you cannot feed it a full schema document with the entire API definition.
As a result, I found myself repeatedly writing the same custom code and commands across all API test projects to: first, extract the specific schema to validate from the full schema document; and second, "massage" that schema into a format that Ajv could process.
Obviously, this is not very DRY (Don’t Repeat Yourself) principle-friendly!
2. I discovered that the way Ajv returns schema validation errors is not straightforward. Many of these errors are particularly complex to understand.
If you don't believe me, check out this example of schema errors provided by Ajv for a relatively simple schema with just two objects in the data response:
Ugh! Right?
So, **what if we take the Ajv Schema Validator to the next level by integrating it seamlessly with Cypress**, and providing the schema discrepancies results in a very user-friendly way that is easy to understand? This would enable easier and more robust validation in our testing workflow.
#### The new Vigilante on the block: The CYPRESS-AJV-SCHEMA-VALIDATOR Plugin
Afterward, it became clear to me that all of this could be turned into a plugin. However, I wanted it to be incredibly easy to use, requiring virtually no configuration.
The new `cypress-ajv-schema-validator` plugin is available for installation on [NPM](https://www.npmjs.com/package/cypress-ajv-schema-validator), and the open source code is available on [GitHub](https://github.com/sclavijosuero/cypress-ajv-schema-validator).
##### Main Features
- It includes a Cypress command **`cy.validateSchema()`** and a utility function **`validateSchema()`** to report JSON Schema validation errors in the response obtained from any network request with `cy.request()`.
- The command `cy.validateSchema()` is chainable and returns the original API response yielded.
- It supports schemas provided as plain **JSON schema**, **OpenAPI 3.0.1 schema document**, and **Swagger 2.0 schema document**, which can be sourced from a Cypress fixture.
- It uses the **Ajv JSON Schema Validator** as its core engine.
- It provides in the **Cypress log** a **summary of the schema errors**, as well as a **list of the individual errors** in the schema validation.
- By clicking on the summary of schema errors in the Cypress log, the console will output:
- Number of schema errors.
- Full list of schema errors as provided by Ajv.
- A **nested tree view of the validated data**, clearly indicating the errors and where they occurred in an **easy-to-understand format**.
> ⭐⭐⭐⭐⭐
> Note: This plugin would complement Filip Hric's [cypress-plugin-api](https://github.com/filiphric/cypress-plugin-api) and Gleb Bahmutov's [@bahmutov/cy-api](https://github.com/bahmutov/cy-api) plugins to perform JSON schema validations.
>
> Example usage with these two API plugins:
> `cy.api('/users/1').validateSchema(schema)`
##### Installation
```sh
npm install cypress-ajv-schema-validator
// or
yarn add cypress-ajv-schema-validator
```
##### Compatibility
- Cypress 12.0.0 or higher
- Ajv 8.16.0 or higher
- ajv-formats 3.0.1 or higher
##### Configuration
Add the following lines either to your `cypress/support/commands.js` to include the custom command and function globally, or directly in the test file that will host the schema validation tests:
- For `cy.validateSchema()` Custom Command:
```js
import 'cypress-ajv-schema-validator'
```
- For `validateSchema()` Function:
```js
import validateSchema from 'cypress-ajv-schema-validator'
```
##### API Reference
###### Custom Command `cy.validateSchema(schema, path)`
Validates the given data against the provided schema.
- Parameters
- `schema` (object): The schema to validate against. Supported formats are plain JSON schema, Swagger, and OpenAPI documents.
- `path` (object, optional): The path object to the schema definition in a Swagger or OpenAPI document.
- `endpoint` (string, optional): The endpoint path.
- `method` (string, optional): The HTTP method. Defaults to 'GET'.
- `status` (integer, optional): The response status code. Defaults to 200.
- Returns
- `Cypress.Chainable`: The response object wrapped in a Cypress.Chainable.
- Throws
- `Error`: If any of the required parameters are missing or if the schema or schema definition is not found.
Example providing a Plain JSON schema:
```js
cy.request('GET', 'https://awesome.api.com/users/1')
.validateSchema(schema);
```
Example providing an OpenAPI 3.0.1 or Swagger 2.0 schema documents:
```js
cy.request('GET', 'https://awesome.api.com/users/1')
.validateSchema(schema, { endpoint: '/users/{id}', method: 'GET', status: 200 });
```
###### Function `validateSchema(data, schema, path)`
Validates the given data against the provided schema.
- Parameters
- `data` (any): The data to be validated.
- `schema` (object): The schema to validate against.
- `path` (object, optional): The path object to the schema definition in a Swagger or OpenAPI document.
- `endpoint` (string, optional): The endpoint path.
- `method` (string, optional): The HTTP method. Defaults to 'GET'.
- `status` (integer, optional): The response status code. Defaults to 200.
- Returns
- `Array`: An array of validation errors, or null if the data is valid against the schema.
- Throws
- `Error`: If any of the required parameters are missing or if the schema or schema definition is not found.
Example providing a Plain JSON schema:
```js
cy.request('GET', 'https://awesome.api.com/users/1').then(response => {
const data = response.body
const errors = validateSchema(data, schema);
expect(errors).to.have.length(0); // Assertion to ensure no validation errors
});
```
Example providing an OpenAPI 3.0.1 or Swagger 2.0 schema documents:
```js
cy.request('GET', 'https://awesome.api.com/users/1').then(response => {
const data = response.body
const errors = validateSchema(data, schema, { endpoint: '/users/{id}', method: 'GET', status: 200 });
expect(errors).to.have.length(0); // Assertion to ensure no validation errors
});
```
##### Usage Examples
###### `cy.validateSchema()` command with a **Plain JSON schema**.
```js
describe('API Schema Validation with Plain JSON', () => {
it('should validate the user data using plain JSON schema', () => {
const schema = {
"type": "object",
"properties": {
"name": { "type": "string" },
"age": { "type": "number" }
},
"required": ["name", "age"]
};
cy.request('GET', 'https://awesome.api.com/users/1')
.validateSchema(schema)
.then(response => {
// Further assertions
});
});
});
```
###### `cy.validateSchema()` command with a **Swagger 2.0 schema** document.
```js
describe('API Schema Validation with Swagger 2.0', () => {
it('should validate the user data using Swagger 2.0 schema', () => {
const schema = {
"swagger": "2.0",
"paths": {
"/users/{id}": {
"get": {
"responses": {
"200": {
"schema": { "$ref": "#/definitions/User" }
}
}
}
}
},
"definitions": {
"User": {
"type": "object",
"properties": {
"name": { "type": "string" },
"age": { "type": "number" }
},
"required": ["name", "age"]
}
}
};
const path = { endpoint: '/users/{id}', method: 'GET', status: 200 };
cy.request('GET', 'https://awesome.api.com/users/1')
.validateSchema(schema, path)
.then(response => {
// Further assertions
});
});
});
```
###### `validateSchema()` function with an **OpenAPI 3.0.1 schema** document.
```js
import validateSchema from 'cypress-ajv-schema-validator';
describe('API Schema Validation Function', () => {
it('should validate the user data using validateSchema function', () => {
const schema = {
"openapi": "3.0.1",
"paths": {
"/users/{id}": {
"get": {
"responses": {
"200": {
"content": {
"application/json": {
"schema": { "$ref": "#/components/schemas/User" }
}
}
}
}
}
}
},
"components": {
"schemas": {
"User": {
"type": "object",
"properties": {
"name": { "type": "string" },
"age": { "type": "number" }
},
"required": ["name", "age"]
}
}
}
};
const path = { endpoint: '/users/{id}', method: 'GET', status: 200 };
cy.request('GET', 'https://awesome.api.com/users/1').then(response => {
const errors = validateSchema(response.body, schema, path);
expect(errors).to.have.length(0); // Assertion to ensure no validation errors
});
});
});
```
For more detailed usage examples, check the document [USAGE-EXAMPLES.md](https://github.com/sclavijosuero/cypress-ajv-schema-validator/blob/main/USAGE-EXAMPLES.md) in the plugin GitHub repository.
##### Validation Results
One of the key strengths of the `cypress-ajv-schema-validator` plugin is its **ability to clearly display validation results within the Cypress log**. This feature makes debugging much simpler and more efficient, as it provides immediate, actionable insights right where you need them. Whether your tests pass or fail, the plugin ensures that the feedback is both comprehensive and user-friendly. Let's explore how this works.
###### Test Passed
When a test passes, the Cypress log will show the message: "✔️ PASSED - THE RESPONSE BODY IS VALID AGAINST THE SCHEMA.".
###### Test Failed
When a test fails, the Cypress log will display the message: "❌ FAILED - THE RESPONSE BODY IS NOT VALID AGAINST THE SCHEMA," indicating the total number of errors: (Number of schema errors: N).
Additionally, the Cypress log will provide entries for each individual schema validation error as identified by AJV. Errors related to missing fields in the validated data are marked with the symbol 🗑️, while other types of errors are flagged with the symbol 👉.
###### Detailed Error View in the Console
For a more in-depth look, open the Console in your browser's DevTools and click on the summary line for the schema validation errors in the Cypress log. The **console will reveal detailed information about all the errors**, including:
- The total number of errors.
- The full list of errors as reported by AJV.
- A **user-friendly view of the validated data**, highlighting the exact location and reason for each validation error.
The plugin continues to provide the list of schema errors in Ajv format, but it also offers the response data that was validated, indicating exactly where the errors are located and precisely what those errors are.
This content can be copied directly from the console and provided elsewhere in a JSON file.
```json
[
{
"id": "👉 \"abc123\" must match format \"uuid\"",
"description": "👉 null must be string",
"createdDate": "👉 \"abc123\" must match format \"date-time\"",
"priority": 3,
"completed": true,
"details": {
"detail1": "👉 789 must be string",
"detail2": "🗑️ Missing property \"detail2\""
}
},
{
"id": "👉 null must be string",
"description": "New Entry",
"completed": "👉 \"false\" must be boolean",
"priority": "👉 true must be integer",
"details": {
"detail2": 260
},
"createdDate": "🗑️ Missing property \"createdDate\""
}
]
```
By presenting validation results in this clear and structured manner, the `cypress-ajv-schema-validator` plugin not only makes your testing workflow more robust but also saves you valuable time and effort in identifying and resolving issues.
---
### ACT3: RESOLUTION
What an adventure it's been delving into the world of vigilant testing! Just like a vigilante swooping in to restore order in a chaotic city, the **cypress-ajv-schema-validator** plugin ensures your testing environment stays neat, efficient, and just. With its precise JSON schema validation and clear, user-friendly error reporting, this plugin is the hero your API testing workflow deserves.
Imagine AJV as your trusty sidekick, always ready to catch even the most elusive validation errors. And with our plugin, navigating the treacherous streets of API testing becomes a lot less daunting and a lot more exhilarating. Whether you're dealing with JSON schemas, or complete OpenAPI and Swagger documents, this plugin steps in to maintain law and order, ensuring that no violation goes unnoticed.
So don your tester's cape, and add **cypress-ajv-schema-validator** to your arsenal. With this powerful tool, you'll be ready to tackle any challenge that comes your way, maintaining justice and peace in the realm of API testing.
Stay vigilant, stay validated!
**_Don't forget to leave a comment, give a thumbs up, or follow my Cypress blog if you found this new plugin and this post useful. Your feedback and support are always appreciated!_**
| sebastianclavijo |
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Once a suitable proposal captures your interest, you can proceed to initiate a trade with the respective user, opening the doors to a seamless Bitcoin investing experience.\n\nIn conclusion, when considering the option of purchasing verified Paxful accounts, exercising caution and conducting thorough due diligence is of utmost importance. It is highly recommended to seek reputable sources and diligently research the seller’s history and reviews before making any transactions.\n\nMoreover, it is crucial to familiarize oneself with the terms and conditions outlined by Paxful regarding account verification, bearing in mind the potential consequences of violating those terms. By adhering to these guidelines, individuals can ensure a secure and reliable experience when engaging in such transactions. Buy Verified Paxful Account.\n\n \n\nContact Us / 24 Hours Reply\nTelegram:dmhelpshop\nWhatsApp: +1 (980) 277-2786\nSkype:dmhelpshop\nEmail:dmhelpshop@gmail.com\n\n" | flaviodukagjinit4 |
1,889,886 | Discussion: How do you approach building websites or apps? | Hey, fellow DEVs, I'm curious 🤔 about our processes when starting a new project/challenge.🌟 Whether... | 0 | 2024-06-15T22:19:25 | https://dev.to/jennavisions/discussion-how-do-you-approach-building-websites-or-apps-3oi9 | discuss, webdev, developer, productivity | Hey, fellow DEVs,
I'm curious 🤔 about our processes when starting a new project/challenge.🌟
Whether you have years of experience or are new to the field, I'm sure you have valuable insights to offer.💡✨
Do you start by creating a plan on paper or move straight to code?📝💻
What is your approach to development when you already have a design?🎨
What are your favourite tools or technologies in your development workflow? 🛠️
Let's talk about it in the comments below!💬😊 | jennavisions |
1,889,885 | 🚀 Continuous Integration and Continuous Delivery (CI/CD): A Must-Have for SMBs 🚀 | In today's fast-paced digital landscape, small and medium-sized businesses (SMBs) are constantly... | 0 | 2024-06-15T22:19:04 | https://dev.to/vaibhavhariaramani/continuous-integration-and-continuous-delivery-cicd-a-must-have-for-smbs-4pm | In today's fast-paced digital landscape, small and medium-sized businesses (SMBs) are constantly seeking ways to stay competitive and deliver high-quality software products efficiently. One key solution that has revolutionized software development and deployment is Continuous Integration and Continuous Delivery (CI/CD). In this post, we will explore why CI/CD has become a must-have for SMBs and how it can significantly enhance the software development lifecycle.
First, let's understand what CI/CD is all about. Continuous Integration (CI) is a development practice that requires developers to integrate code changes into a shared repository regularly. This process automatically triggers a series of tests and builds, allowing teams to identify and fix issues early on. On the other hand, Continuous Delivery (CD) focuses on automating the deployment of software to various environments, enabling frequent and reliable releases.
### So why is CI/CD essential for SMBs? Let's dive into the benefits:
1️⃣ **Faster Time to Market:** With CI/CD, SMBs can release software updates and new features quickly and consistently. The automated testing and deployment processes eliminate manual errors, reduce time-consuming tasks, and ensure that new changes are thoroughly tested before being deployed. This accelerated time to market gives SMBs a competitive edge by allowing them to respond swiftly to customer demands and market trends.
2️⃣ **Improved Software Quality:** CI/CD promotes a culture of continuous testing, enabling developers to catch and fix bugs early in the development cycle. Automated testing procedures, such as unit tests, integration tests, and acceptance tests, ensure that the software remains stable and reliable throughout its lifecycle. By maintaining high software quality, SMBs can build trust with their customers and avoid costly post-release issues.
3️⃣ **Enhanced Collaboration:** CI/CD encourages collaboration and transparency among development, testing, and operations teams. By integrating code changes regularly, developers can detect and resolve conflicts early, reducing the chances of integration issues down the line. Furthermore, automated builds and deployments provide visibility into the entire process, allowing teams to work together efficiently and address any bottlenecks promptly.
4️⃣ **Increased Efficiency and Cost Savings:** Traditional manual software deployment processes are time-consuming and error-prone. CI/CD automates repetitive tasks, eliminating the need for manual intervention. This automation streamlines the software development lifecycle, reduces human errors, and frees up valuable time for developers to focus on innovation and core business objectives. Ultimately, this improved efficiency translates into cost savings for SMBs.
5️⃣ **Scalability and Flexibility:** CI/CD empowers SMBs to scale their software development and delivery processes seamlessly. As the business grows, CI/CD pipelines can be easily extended and customized to accommodate evolving requirements. Additionally, the ability to automate deployments across multiple environments, such as staging and production, ensures consistent and reliable software releases irrespective of the deployment target.
Implementing CI/CD may seem daunting at first, but with the right tools and expertise, SMBs can quickly adopt and leverage its benefits. Cloud-based platforms, such as AWS CodePipeline, Jenkins, or GitLab CI/CD, provide robust CI/CD capabilities, enabling SMBs to automate their software delivery pipelines with ease.
In conclusion, Continuous Integration and Continuous Delivery (CI/CD) is no longer just a luxury for large enterprises—it has become a crucial tool for SMBs to remain competitive in the fast-paced software industry. By embracing CI/CD practices, SMBs can accelerate their time to market, enhance software quality, foster collaboration, increase efficiency, and drive cost savings. It's time for SMBs to harness the power of CI/CD and unlock their true potential in delivering exceptional software products | vaibhavhariaramani | |
1,889,884 | Enhancing Kubernetes Security with RBAC | In the dynamic landscape of cloud-native technologies, ensuring the security of your Kubernetes... | 0 | 2024-06-15T22:13:59 | https://dev.to/vaibhavhariaramani/enhancing-kubernetes-security-with-rbac-1mc9 | In the dynamic landscape of cloud-native technologies, ensuring the security of your Kubernetes cluster is paramount. One of the fundamental ways to bolster your cluster's defenses is by implementing Role-Based Access Control (RBAC). Let's dive into a concise guide on how to effectively harness RBAC to restrict permissions and grant access only to authorized users within your Kubernetes environment.
### Role-Based Access Control (RBAC) Explained:
RBAC is like a digital bouncer for your Kubernetes cluster, allowing you to control who can access, modify, or delete resources. By setting up RBAC, you can align access permissions with job responsibilities, mitigating potential security vulnerabilities.
### Step-by-Step Guide: Implementing RBAC in Kubernetes:
1. **Define Roles and ClusterRoles:** Start by creating custom roles that define what actions are permitted on specific resources. Think of these as the rulebooks for users or groups. ClusterRoles extend these rules to cluster-wide resources.
2. **Assign Roles to Users and Service Accounts:** Next, associate these roles with users, groups, or service accounts. This ensures that only those with the appropriate roles can interact with resources.
3. **Use RoleBindings and ClusterRoleBindings:** Link roles with users/groups using RoleBindings or ClusterRoleBindings. This step connects the dots between the 'who' (users) and the 'what' (permissions).
4. **Regularly Review and Update Roles:** As your cluster evolves, so will your access requirements. Continuously assess and update roles to accommodate changes while maintaining the principle of least privilege.
## Benefits of RBAC:
- **Granular Access Control:** RBAC allows fine-grained control over what users can do, helping to prevent accidental or malicious damage.
- **Segregation of Duties:** Different teams can work in isolation, each with the necessary permissions, without risking cross-team interference.
- **Enhanced Security:** Unauthorized access is minimized, and any potential breaches are localized, limiting the scope of damage.
Kubernetes security is a shared responsibility. By implementing RBAC, you're taking a significant step toward creating a robust and secure environment for your applications and data. Remember, RBAC is just one piece of the puzzle; a comprehensive security strategy combines various measures to create a strong defense.
Let's keep the conversation going. Have you implemented RBAC in your Kubernetes environment? Share your experiences and insights below! Together, we can fortify our cloud-native landscapes against emerging threats.
#kubernetes #rbac #devops #devopsengineers
| vaibhavhariaramani | |
1,889,883 | Tweet collection | Can we collect stream tweet using basic account, | 0 | 2024-06-15T22:12:52 | https://dev.to/education_uk_ab4cb0a667f8/tweet-collection-3okb | Can we collect stream tweet using basic account, | education_uk_ab4cb0a667f8 | |
1,889,882 | Docker Layers for Efficient Image Building | Docker has revolutionized the way we package and deploy applications, making it easier than ever to... | 0 | 2024-06-15T22:10:47 | https://dev.to/vaibhavhariaramani/docker-layers-for-efficient-image-building-48an | Docker has revolutionized the way we package and deploy applications, making it easier than ever to create, distribute, and run software in containers. One of the key factors that contribute to Docker's efficiency is its use of layers in building container images. Let us explore the significance of Docker layers, their role in image construction, and effective strategies for optimizing them to accelerate the image building process.
### Docker Layers Explained
At its core, a Docker image is composed of a series of read-only layers stacked on top of each other. Each layer represents a set of file system changes, and every Dockerfile instruction adds a new layer to the image. These layers are cached by Docker, enabling quicker image builds and efficient use of resources.
## Here's how it works:
**Dockerfile instructions:** When you create a Dockerfile, you typically start with a base image, and then you add instructions one by one to customize that image. Each instruction in the Dockerfile creates a new layer with a unique identifier.
**Caching:** Docker uses a caching mechanism to store intermediate layers. If a layer already exists and hasn't changed since the last build, Docker will reuse it from the cache rather than recreating it. This is where the order of instructions in the Dockerfile becomes important.
For instructions that change infrequently (e.g., installing system packages or dependencies), it's beneficial to place them near the top of the Dockerfile. This allows Docker to cache these layers, and subsequent builds can reuse them, saving time.
For instructions that change frequently (e.g., copying application code), they should be placed near the bottom of the Dockerfile. This ensures that changes in your application code trigger a rebuild of fewer layers, which is faster.
** Layer inheritance:** When you add instructions to the Dockerfile, each new layer inherits the contents of the previous layer. This is why it's important to order your Dockerfile instructions efficiently. Layers at the bottom of the Dockerfile change less frequently, while layers at the top change more frequently.
**Reusability:** Docker layers are designed for reusability. Layers that are identical across different images can be shared among those images, saving disk space.
**Size considerations:** Keep in mind that each layer adds to the size of the final Docker image. Large unnecessary files or artifacts in early layers can significantly increase the image size. To minimize image size, you can use techniques like multi-stage builds to reduce the number of layers in the final image.
## Order of Instructions in a Dockerfile
The order in which you arrange instructions in your Dockerfile matters significantly. To make the most of Docker's caching mechanism, it's crucial to place frequently changing instructions towards the bottom of the Dockerfile. Why? Because when you modify a layer, all layers built on top of it must be rebuilt.
For instance, if you install system packages or dependencies early in your Dockerfile, those layers will remain mostly unchanged unless you modify the package list. However, if you copy your application code into the image near the bottom of the Dockerfile, any changes to your code will only affect that layer and the ones above it.
### Layer Invalidation
Understanding layer invalidation is crucial. When you make changes in a lower layer, Docker detects the change and invalidates all subsequent layers. For instance, if you update your application code and rebuild the image, Docker will need to recreate the layer that contains your application code and all the layers that depend on it.
This is why it's essential to minimize the number of invalidated layers during image builds. Placing infrequently changing instructions at the top and frequently changing ones at the bottom of Dockerfile is a best practice for achieving this.
## Best Practices for Dockerfile Optimization
To optimize your Dockerfile and image building process:
- **Utilize multi-stage builds:** Multi-stage builds help reduce the number of layers in the final image. You can use one stage for building your application and another for running it, resulting in a smaller and more efficient final image.
- **Clean up unnecessary artifacts:** Remove temporary files and clean up after each instruction to keep your image size to a minimum.
## Real-world Use Cases
Understanding Docker layers can significantly impact your CI/CD pipelines and production deployments. Consider scenarios where image build times are critical, such as frequent code changes or large-scale deployments. By following best practices for Dockerfile optimization, you can save time and resources.
## Conclusion
Docker layers play a pivotal role in image building efficiency. By strategically placing instructions in your Dockerfile and optimizing your image creation process, you can reduce build times and enhance resource utilization. This knowledge is invaluable for anyone working with Docker, from developers to DevOps engineers, as it empowers them to create and maintain efficient containerized applications.
Understanding Docker layers is just one aspect of Docker's power. Explore further, experiment, and continue to enhance your containerization skills to make the most of this revolutionary technology. | vaibhavhariaramani | |
1,889,881 | What are the benefits and challenges of migrating from Jenkins to GitHub Actions? | 1. Benefits of GitHub Actions One of the main benefits of GitHub Actions is that it... | 0 | 2024-06-15T22:05:42 | https://dev.to/vaibhavhariaramani/what-are-the-benefits-and-challenges-of-migrating-from-jenkins-to-github-actions-1e39 | ## 1. Benefits of GitHub Actions
One of the main benefits of GitHub Actions is that it simplifies your CI/CD workflow by eliminating the need for a separate server, installation, or management of Jenkins. You can use GitHub's cloud infrastructure or your own self-hosted runners to run your actions, and scale them up or down as needed. You can also leverage GitHub's ecosystem of services and tools, such as GitHub Packages, GitHub Pages, GitHub Code Scanning, and GitHub Marketplace, to enhance your software delivery process. GitHub Actions also supports a wide range of languages, frameworks, and platforms, and allows you to customize your workflows with YAML files, shell scripts, or reusable actions from the community.
## 2. Challenges of GitHub Actions
However, migrating from Jenkins to GitHub Actions also poses some challenges. First, you need to understand the differences and similarities between the two tools, such as the terminology, syntax, structure, and functionality of their workflows. For example, Jenkins uses pipelines, stages, steps, and nodes, while GitHub Actions uses workflows, jobs, steps, and runners. You also need to learn how to use GitHub's features and conventions, such as events, contexts, expressions, and environments. Second, you need to assess your current Jenkins setup and identify the components that need to be migrated, modified, or replaced. For example, you might need to rewrite your scripts, convert your plugins, migrate your credentials, or find alternative solutions for some of the features that GitHub Actions does not support or handle differently, such as parallelism, concurrency, or artifacts management. Third, you need to test your new GitHub Actions workflows thoroughly and ensure that they work as expected and meet your quality and performance standards. You might also need to monitor and troubleshoot your workflows and handle any errors or failures that might occur.
## 3. Tips for migration
To help you with the migration process, here are some tips and resources that you might find useful. First, start with a small and simple project that does not have many dependencies or complex requirements. This will allow you to familiarize yourself with GitHub Actions and compare it with Jenkins. You can also use this project as a template or reference for your other projects. Second, use the official documentation and guides from GitHub and Jenkins to learn about the best practices and recommendations for migrating from Jenkins to GitHub Actions. You can also check out some of the examples and tutorials from other developers who have done the migration and learn from their experiences and challenges. Third, use the tools and services that are available to help you with the migration. For example, you can use the Jenkinsfile Converter to automatically convert your Jenkinsfile to a GitHub Actions workflow file. You can also use the GitHub Importer to import your Jenkins projects to GitHub. You can also use the GitHub CLI to interact with GitHub Actions from your command line.
## 4. Resources for migration
If you're looking for more information and guidance on migrating from Jenkins to GitHub Actions, there are a few resources you may want to check out. These include the official documentation for GitHub Actions, the official guide for migrating from Jenkins to GitHub Actions, and the official blog post on how GitHub migrated from Jenkins to GitHub Actions. Additionally, you can find the official repository for the Jenkinsfile Converter, the GitHub Importer, and the GitHub CLI.
| vaibhavhariaramani | |
1,889,880 | What are the most useful Jenkins plugins and tools for logging and monitoring? | 1. Logstash Plugin The Logstash plugin allows you to send your Jenkins logs to a Logstash... | 0 | 2024-06-15T22:03:10 | https://dev.to/vaibhavhariaramani/what-are-the-most-useful-jenkins-plugins-and-tools-for-logging-and-monitoring-58cj | ## 1. Logstash Plugin
The Logstash plugin allows you to send your Jenkins logs to a Logstash server, which can then forward them to various destinations, such as Elasticsearch, Kibana, or Splunk. This way, you can centralize your logging infrastructure, search and filter your logs, and create dashboards and alerts. The plugin supports different log formats, such as plain text, JSON, or Grok patterns, and lets you configure the fields and metadata to include in your log messages.
## 2. Blue Ocean
Blue Ocean is a modern user interface for Jenkins that provides a more intuitive and user-friendly way to create and run pipelines. It also offers a better logging and monitoring experience, as it shows you the status and progress of your pipelines and stages, the console output and test results of your jobs, and the changes and commits that triggered your builds. You can also access the classic Jenkins interface from Blue Ocean if you need more advanced features or settings.
## 3. Jenkins Monitoring Plugin
The Jenkins Monitoring Plugin adds a monitoring page to your Jenkins instance, where you can see various metrics and charts related to your system and application performance. You can monitor the CPU, memory, disk, network, and thread usage, the GC activity, the response time, the load average, and the uptime of your Jenkins server. You can also see the statistics and trends of your jobs, such as the build duration, the success rate, the queue time, and the frequency.
## 4. Audit Trail Plugin
The Audit Trail Plugin enables you to track and record the actions and events that occur in your Jenkins instance, such as who logged in or out, who started or stopped a job, who changed a configuration or a credential, and so on. You can view the audit log from the Jenkins web interface, or export it to a file or a database. The plugin also allows you to filter and search the audit log by date, user, node, or action.
## 5. Prometheus Plugin
The Prometheus Plugin exposes the metrics of your Jenkins instance and jobs as a Prometheus endpoint, which can then be scraped and stored by a Prometheus server. Prometheus is a powerful tool for monitoring and alerting, as it lets you query and visualize your metrics using PromQL, a flexible query language. You can also use Grafana, a popular dashboarding tool, to create custom dashboards and graphs based on your Prometheus data.
## 6. Email Extension Plugin
The Email Extension Plugin enhances the built-in email notification feature of Jenkins, by giving you more control and flexibility over when and how to send emails to your recipients. You can configure the triggers, the content, the attachments, and the recipients of your emails based on various criteria, such as the build status, the test results, the changesets, the log excerpts, and the environment variables. You can also use templates, tokens, and scripts to customize your emails.
| vaibhavhariaramani | |
1,889,879 | How to create this type of background on website? | It should work on cross all browsers, I can create it for Chrome, but on other browsers it doesn't... | 0 | 2024-06-15T22:01:02 | https://dev.to/alex_wordpress_2398859323/how-to-create-this-type-of-background-on-website-25m3 | css, tailwindcss, frontend, help |
It should work on cross all browsers, I can create it for Chrome, but on other browsers it doesn't work.
I tried to create a div with linear-gradient or radial-gradient with filter blur and backdrop blur and it doesn't work.
I'll appreciate if anyone can help with this simple problem. | alex_wordpress_2398859323 |
1,889,639 | How airport design mirrors software design | When I flew out of Tampa airport (TPA), I was impressed by the layout of the airport. From a... | 0 | 2024-06-15T22:00:00 | https://dev.to/arjunrao87/how-airport-design-mirrors-software-design-25d5 | When I flew out of Tampa airport (TPA), I was impressed by the layout of the airport. From a passenger’s viewpoint, there are many aspects of running an efficient airport, starting from how you arrive at the airport, all the way to how the boarding process is executed, and TPA nailed most of it.
## How Tampa Airport is organized
When you enter Tampa airport by car, you have an option to go into the “Express” lane if you don’t have any bags to check in which takes you to a separate area compared to if you had bags to check in. For domestic flights, this is an intuitive optimization since it likely splits the crowd into something like 60% (carry-on) and 40% (bag checkin), which reduces the stress on the infrastructure.
Once you enter the airport building itself, it follows a “hub and spoke” model, where the main area splits off into different terminals based on the flights you are taking. There is no security check in this main area.
You just need to scan your boarding pass at the corresponding “spoke” where your flight is supposed to depart. Once you scan the boarding pass, you hop on a very short shuttle ride that takes you to your designated terminal. Its only after you get off that shuttle that you are required to go through security check.
Since there are 4 terminals in the airport, that basically splits the traffic for security checks into ~25% chunks, reducing the load fairly drastically on the security process. While it does mean that Tampa airport needs to pay more for extra staff and scanning equipment, it results in a drastically better security checkin process.
## Tampa vs NYC airports by volume
My initial assumption was that the NYC airports are handling orders of magnitude more passengers than TPA. However, after some quick research I found that for 2021 the passengers handled by these airports are
- TPA: 16.8 million annual passengers
- JFK: 29 million annual passengers
- LGA: 15.6 million annual passengers
JFK being about two times TPA volumes was well under what I had expected, and LGA handling fewer passengers than TPA was definitely unexpected.
## Parallels with designing software systems at scale
There are many similarities between managing airport checkin traffic and queue management in real time streaming systems. After all, airport checkins are similar to website logins :). The tradeoffs of cost v/s complexity should decide what the right approach should be. Centralized airport checkins have been the norm of air travel since the beginning, so having Tampa try the decentralized queueing model feels very innovative, even though the fundamental concepts of these have existed in system design for a long time.
While this is the route that TPA is taking, NYC airports are spending their resources to reduce the time to process an individual by having programs like TSA-Pre and Digital ID being pushed more aggressively. It can be argued that adding more queues to process passengers papers over core inefficiencies that might be worth dealing with first. Maybe having a lower mean-time-to-process a passenger is a better goal than sticking a bunch of passenger queues into your setup? Although that is purely conjecture based on my software engineering experience, and might require some actual research.
Ultimately, everything is function of supply and demand. As air travel continues to increase in demand, it will be interesting to see how airports continue to innovate to solve the demands of passenger scale. | arjunrao87 | |
1,889,878 | The beginning of a flutter journey | I am a flutter developer with a bit of experience, but my favourite part of every programming journey... | 0 | 2024-06-15T21:53:00 | https://dev.to/ulrikueue/the-beginning-of-a-flutter-journey-2kf2 | flutter, programming, learning, beginners | I am a flutter developer with a bit of experience, but my favourite part of every programming journey has always been the beginning, where we are clueless and the learning pace is the fastest.
Like most people, I started my flutter development journey with a tutorial. I want to mention several beginner flutter tutorials that I have seen.
The [first](https://docs.flutter.dev/get-started/codelab) should be the official flutter page's codelab that shows the users how to build a simple flutter app with an interactive environment. This was the tutorial I first used and in my opinion the best one available.
Another example is [the medium article for getting started with linux](https://medium.com/@midhunarmid/getting-started-with-flutter-building-your-first-app-9c7e85598957). It is fairly short and only shows how to run a simple template page. Though it doesn't have much content and doesn't ask the newbie to actually code anything, it does a relatively good job explaining.
There are many other [flutter beginner tutorials](https://www.blunix.com/blog/building-your-first-flutter-app-a-step-by-step-guide-to-creating-a-unit-converter.html#step1) that cover the basics and show the user how to get started with developing applications with flutter.
The most deep of the beginner tutorials that I remember was the [free code camp's tutorial](https://www.freecodecamp.org/news/how-to-develop-a-flutter-app-from-scratch/#step-10-code-styles) that covered everything from setting up the environment to actually publishing the app.
The most important thing to remember is that the tutorials are only there to explain the concept and familiarize with the framework. The most important part is to hone our skills through continuous coding and effort. | ulrikueue |
1,889,872 | CoeFont | CoeFont is a global AI Voice Hub pioneering the future of technology. We empower users worldwide to... | 0 | 2024-06-15T21:30:32 | https://dev.to/youcef_appmaker/coefont-4h2g | music, anieme | CoeFont is a global AI Voice Hub pioneering the future of technology. We empower users worldwide to realize the full potential of their voices.
Use our innovative features such as text-to-speech (TTS), AI voice changer, AI voice creation, and our CoeFont Voice Hub, which features thousands of AI voices ready to be used.[](https://coefont.cloud/en) | youcef_appmaker |
1,889,830 | Designing an Optimal Database Schema for a Followers-Following System in a Blog-Post App | Designing an optimal database schema for a followers-following system in a blog-post app... | 0 | 2024-06-15T21:16:02 | https://dev.to/zobaidulkazi/designing-an-optimal-database-schema-for-a-followers-following-system-in-a-blog-post-app-fj4 | webdev, database, schema, javascript | #### Designing an optimal database schema for a followers-following system in a blog-post app involves considering several factors such as performance, scalability, ease of querying, and data integrity. Here are some best practices and optimization strategies to guide you in designing this database schema.
## 1. User Schema
First, define a User schema to store user information. This schema typically includes fields like:
```javascript
const UserSchema = new Schema({
username: { type: String, required: true, unique: true },
email: { type: String, required: true, unique: true },
password: { type: String, required: true },
// Other user profile information
});
```
## 2. Followers-Following Relationship Schema
To implement the followers-following system, you can use a separate schema or integrate it into the User schema using references.
### Separate Schema Approach
```javascript
const FollowSchema = new Schema({
follower: { type: Schema.Types.ObjectId, ref: 'User', required: true },
following: { type: Schema.Types.ObjectId, ref: 'User', required: true },
createdAt: { type: Date, default: Date.now }
});
// Index to enforce uniqueness of follower-following pairs
FollowSchema.index({ follower: 1, following: 1 }, { unique: true });
const Follow = mongoose.model('Follow', FollowSchema);
```
### Integrated Approach (Using Arrays of References)
```javascript
const UserSchema = new Schema({
username: { type: String, required: true, unique: true },
email: { type: String, required: true, unique: true },
password: { type: String, required: true },
followers: [{ type: Schema.Types.ObjectId, ref: 'User' }],
following: [{ type: Schema.Types.ObjectId, ref: 'User' }],
// Other user profile information
});
```
## 3. Optimization Strategies
### Indexing
Ensure to index fields that are frequently queried, such as follower and following fields in the FollowSchema. This speeds up query performance significantly.
### Query Optimization
Use efficient queries to retrieve followers and following lists:
```javascript
// Retrieve followers of a user
const followers = await Follow.find({ following: userId }).populate('follower');
// Retrieve users a user is following
const following = await Follow.find({ follower: userId }).populate('following');
```
### Denormalization (Embedded Arrays)
If the number of followers or following relationships is relatively small and predictable, you may denormalize this data directly into the User schema. This approach can reduce query complexity but may complicate updates.
### Data Integrity
Ensure data integrity with unique constraints (as shown in FollowSchema.index) and proper handling of follow/unfollow operations to prevent duplicates.
### Scalability
Design for scalability by considering potential growth in the number of users and relationships. Use sharding or partitioning strategies if necessary.
## 4. Schema Design Considerations
- **Consistency**: Ensure consistency in naming conventions and data types across schemas.
- **Normalization vs. Denormalization**: Balance between normalization (to reduce redundancy) and denormalization (for improved query performance).
- **Versioning**: Plan for schema versioning to accommodate future updates and changes in data structure.
## Example Queries
### Followers Count
```javascript
const followersCount = await Follow.countDocuments({ following: userId });
```
### Checking if a User Follows Another
```javascript
const isFollowing = await Follow.exists({ follower: userId1, following: userId2 });
```
## Summary
Designing an optimal database schema for a followers-following system involves structuring user and relationship data efficiently, optimizing queries, ensuring data integrity, and planning for scalability. Choose a schema design that fits your application's requirements and anticipated usage patterns while adhering to MongoDB best practices for performance and scalability.
| zobaidulkazi |
1,889,827 | Proposal - Blockchain Coordination | The productive and peaceable coordination of large groups is a cornerstone of modern civilization.... | 0 | 2024-06-15T21:11:41 | https://dev.to/nkianil/proposal-blockchain-coordination-5793 | blockchain, decentralized, security, bitcoin | The productive and peaceable coordination of large groups is a cornerstone of modern civilization. Systems designed to tackle large-scale coordination challenges—from monetary policy to commercial transactions—have traditionally relied on hierarchical, top-down structures to function effectively. Trusting these systems means relying on centralized institutions to ensure adherence to rules and agreements. Consequently, our ability to coordinate on a large scale has been limited by the reliability of these institutions as intermediaries.
The early 21st century witnessed the rise of Bitcoin, the first decentralized system capable of addressing coordination problems at scale without the need for centralized institutions. By embedding trust guarantees in code rather than in individuals or organizations, Bitcoin demonstrated that open-source software protocols with the right game-theoretic and mathematical properties could create networks that challenge, and potentially surpass, their centralized counterparts.
While Bitcoin is becoming a transformative force in the global monetary system and is on track to becoming the world's first credibly neutral, non-sovereign reserve currency, other areas of society are only beginning to realize the potential of decentralized systems. Building on Bitcoin's principles and achievements, projects like this aim to develop open public infrastructure that supports advanced computation and brings us closer to the vision of a decentralized web.
Despite significant progress by various blockchain platforms, challenges in scalability, usability, and incentivization remain. The decentralized web is still more of a promise than a reality, and a breakthrough akin to the “iPhone moment” that ignited the mobile web revolution has yet to occur. This solution tackles these challenges with its fourth-generation blockchain architecture and the DAVE (Directed Acyclic Validation Engine) consensus model. By leveraging a directed acyclic graph structure and parallel processing, it offers high scalability and efficient validation. The system ensures that multiple transactions can be processed concurrently, reducing bottlenecks and improving performance.
A graph-based structure enables high scalability and efficient validation, making it secure against attacks. Validators earn reputation points for successful validations, ensuring reliable validation and trustworthy participants. Additionally, validators can set their own service fee percentages, creating a dynamic and competitive environment that incentivizes high performance. The system leverages batch transactions and sharding to further enhance scalability. Batch transactions allow multiple transactions to be processed together, reducing overhead and improving efficiency. Sharding divides the network into smaller shards, each capable of processing transactions independently, thereby increasing throughput. Parallel processing and asynchronous processing enable multiple transactions to be validated concurrently and reducing latency. This multi-faceted approach ensures a robust, scalable, and efficient system capable of handling a high volume of transactions.
It should be designed with developers in mind, offering robust APIs and SDKs for seamless integration, comprehensive documentation for guidance, and an active community for support and collaboration. This system provides flexible tools that enable developers to leverage the platform’s capabilities without extensive blockchain expertise. Detailed documentation includes practical examples and tutorials to help developers navigate the platform efficiently. An active developer community fosters collaboration and knowledge sharing, enhancing the overall development experience.
A system like this, with the innovative DAVE consensus model and advanced architecture, is poised to revolutionize the blockchain industry. By addressing key challenges and providing a robust platform for a wide range of applications, creating new standards in the blockchain space and lead the way into the future of decentralized technology.
**DAVE - Consensus model:**
**Transaction Representation**
The system operates by representing each transaction (Ti) as a node within a graph structure. These transactions are stored in a hash map where the key is the transaction ID and the value is the transaction data:
Directed edges between transactions indicate dependencies, such that an edge from (Ti) to (Tj) signifies that (Ti) must be processed before (Tj). Outgoing edges are stored in (o_edges) and incoming edges in (i_edges):
**Transitive Closure and Reduction**
The transitive closure of the graph provides the set of all reachable nodes from a given node, while transitive reduction minimizes the number of edges while preserving reachability:
**Topological Sorting**
Topological sorting orders the transactions such that for every directed edge (Ti -> Tj),
**Consensus Flags**
Consensus flags indicate the state of consensus for each transaction:
**Validator Selection and Cryptographic Operations**
Validators are selected based on their reputation scores. Validators are sorted, and the top third are selected:
The system also performs cryptographic operations to prove knowledge of a secret (x) without revealing it. The proof consists of (y,r), where (y) is the public value and (r) is the response to the challenge:
**Combined Operation**
The combined operation begins with the addition and validation of transactions. Transactions are added to the graph, and validators validate them, updating temporary balances to ensure no double-spending:
Based on the number of validator approvals, consensus flags are updated:
The graph state is synchronized with external sources to ensure consistency across the network:
The module allows for the addition of transactions and the establishment of dependencies through edges. This forms a graph where each transaction must be processed in a specific order to maintain consistency. Another module selects a subset of validators based on their reputation scores. This selection process ensures that only the most reputable validators participate in the validation process. Validators validate each transaction in the graph. This validation checks for consistency, such as ensuring that transactions do not conflict and that double-spending is prevented. Temporary balances are used during validation to simulate the state changes without committing them until consensus is reached. Based on the validation results, the module updates the consensus flags for each transaction. This flag indicates the level of consensus achieved: PreAcceptance, Acceptance, PreConfirmation, Confirmation, and Finalization. The module synchronizes its state with external transactions, ensuring that all nodes in the network have a consistent view of the transaction history. This is crucial for maintaining the integrity and reliability of the network.
**Layer Separation and Fee Distribution**
In the system, Layer 0 and Layer 1 are separated to enhance efficiency and security. All transaction fees are moved to Layer 1, where the main transaction processing occurs. However, Layer 0, consisting of validators, earns service fees from Layer 1. Validators in Layer 0 validate transactions and provide essential network services, for which they receive a portion of the transaction fees as service fees. This separation ensures a clear distinction between transaction processing and validation tasks, improving the overall system performance and scalability.
Navid Kiani Larijani - June 2024 | nkianil |
1,889,828 | Find Your Soulmate with Psychic Luna’s Unique Sketch Service | Are you longing to meet your soulmate? Do you believe in the mystical power of psychic insights to... | 0 | 2024-06-15T21:10:58 | https://dev.to/soulmatesketch/find-your-soulmate-with-psychic-lunas-unique-sketch-service-1kkf | soulmatesketch | Are you longing to meet your soulmate? Do you believe in the mystical power of psychic insights to guide you towards your true love? Psychic Luna is here to help you discover the person destined to be your lifelong partner with her unique soulmate sketch service.
## Introducing Psychic Luna’s Soulmate Sketches
My name is Psychic Luna, and I specialize in creating detailed, hand-[drawn sketches of soulmates](https://thesoulmatesketcher.com/) using my psychic abilities. Combining psychic intuition with artistic skill, I offer you a visual representation of the person who holds the key to your heart.
## What Makes Psychic Luna’s Service Unique?
- **Personalized Sketches**: Each sketch is tailored specifically to you, capturing the essence and appearance of your soulmate.
- **Psychic Insights**: Alongside the sketch, receive personalized insights and messages about your soulmate and the path to finding them.
- **Proven Success**: Countless clients have successfully connected with their soulmates through my sketches and guidance.
## How Does It Work?
1. **Submit Your Request**: Fill out a simple form with basic information about yourself.
2. **Psychic Visualization**: I will meditate and use my psychic abilities to visualize your soulmate.
3. **Receive Your Sketch**: Within a few days, you will receive a detailed sketch of your soulmate along with personalized insights.
## Why Choose Psychic Luna?
- **Authentic Psychic Experience**: With years of experience and numerous success stories, I am dedicated to helping you find true love.
- **Unique and Personalized**: Each sketch is uniquely tailored to you, providing a one-of-a-kind glimpse into your romantic future.
- **Community of Believers**: Join a growing community of individuals who believe in the power of psychic connections and soulmate revelations.
## Real Success Stories
Don’t just take my word for it – here are a few stories from clients who have found their soulmates through my service:
- **Emma from New York**: “Psychic Luna’s sketch was astonishingly accurate. I met my soulmate a few months later, and he looked just like the drawing!”
- **James from London**: “The insights Luna provided helped me understand my path to finding love. I am now happily engaged to my soulmate.”
- **Sofia from Sydney**: “I was skeptical at first, but the sketch and messages resonated deeply with me. Meeting my soulmate has been the most amazing experience.”
## Take the First Step Towards True Love
Are you ready to uncover the mysteries of your love life and meet your soulmate? Visit my Substack, Psychic Luna Soulmate Sketch, and subscribe today to start your journey.
**Subscribe Now** and let’s discover your true love together!
---
**About Psychic Luna**: With years of experience in psychic readings and soulmate sketches, Psychic Luna is dedicated to helping individuals find their true love. Her unique combination of psychic intuition and artistic talent has transformed countless lives, providing hope and guidance to those seeking their soulmate.
---
Feel free to share your thoughts and experiences in the comments below. I look forward to guiding you on this incredible journey of love and discovery.
With love and light,
Psychic Luna | soulmatesketch |
1,889,819 | Fixing Apex Domain Issues for Next.js Sites Hosted on Vercel | Fixing Apex Domain Issues for Next.js Sites Hosted on Vercel If you're hosting Next.js... | 0 | 2024-06-15T20:40:11 | https://dev.to/joshydev/fixing-apex-domain-issues-for-nextjs-sites-hosted-on-vercel-5h52 | ### Fixing Apex Domain Issues for Next.js Sites Hosted on Vercel
If you're hosting Next.js sites on Vercel and using custom domains purchased from Namecheap, you might encounter a common issue where the apex domain (mysite.com) does not load while the www subdomain (www.mysite.com) works perfectly. This guide will walk you through the steps to resolve this issue by correctly setting up your DNS records.
#### The Issue
When visiting `www.mysite.com`, your site loads without any problems, but trying to access `mysite.com` results in the "site can’t be reached". This is usually due to incorrect DNS record configurations for the apex domain.
#### The Solution
To fix this, you need to update your DNS records in Namecheap to properly point the apex domain to your Vercel-hosted site.
### Step-by-Step Guide
1. **Access Namecheap DNS Settings**
- Log in to your [Namecheap account](https://www.namecheap.com/).
- Navigate to the "Domain List" section from the left sidebar.
- Find the domain you want to configure and click on the "Manage" button.
2. **Update DNS Records**
- Go to the "Advanced DNS" tab.
- Look for existing DNS records related to the domain. You might find an A record pointing to an IP address (e.g., `@ -> 76.76.21.21`).
3. **Remove Incorrect A Record**
- If you have an A record for the apex domain (`@`), remove it. This record typically points to an IP address that might not be suitable for Vercel's configuration.
4. **Add CNAME Record for Apex Domain**
- Click on "Add New Record".
- Select "CNAME Record" from the dropdown menu.
- Set the "Host" field to `@`.
- Set the "Value" field to your Vercel subdomain (e.g., `your-site-name.vercel.app`).
- Click the checkmark to save the record.
Example:
```
Type: CNAME Record
Host: @
Value: your-site-name.vercel.app
TTL: Automatic
```
5. **Verify the Changes**
- DNS changes can take some time to propagate. It might take anywhere from a few minutes to 48 hours for the changes to fully take effect.
- To verify, you can use online tools like [DNS Checker](https://dnschecker.org/) to see if your apex domain is correctly pointing to Vercel.
6. **Test Your Site**
- After the DNS changes have propagated, visit both `mysite.com` and `www.mysite.com` to ensure both URLs load your site correctly.
### Additional Tips
- **Vercel Domain Configuration**: Ensure that you have added both the www and apex versions of your domain in the Vercel dashboard under your project’s settings.
- **Redirect Non-www to www (or vice versa)**: You might want to set up a redirect from the non-www version to the www version (or the other way around) to ensure consistent access. This can be done in Vercel's project settings or through additional DNS configurations.
### Conclusion
By replacing the A record with a CNAME record pointing to your Vercel subdomain, you can resolve the issue of your apex domain not loading. This ensures that both `mysite.com` and `www.mysite.com` work seamlessly. | joshydev | |
1,889,826 | How to Create a Library Package from an existing Angular App | Creating a library package from an existing Angular application can significantly streamline code... | 0 | 2024-06-15T21:02:20 | https://dev.to/jcarloscandela/how-to-create-a-library-package-from-an-existing-angular-app-using-ng-packagr-3b62 | angular, libraries, npm, tutorial | Creating a library package from an existing Angular application can significantly streamline code reuse and modularity across different projects. In this guide, we'll walk through the process using the `ng-packagr` tool, with an example based on the [Ionic Conference App](https://github.com/ionic-team/ionic-conference-app).
## Prerequisites
Before we begin, ensure you have an existing Angular project. For this example, we'll use the Ionic Conference App.
1. Clone the Ionic Conference App:
```sh
git clone https://github.com/ionic-team/ionic-conference-app
cd ionic-conference-app
```
## Step 1: Install ng-packagr
First, install `ng-packagr` in your project:
```sh
npm install ng-packagr
```
## Step 2: Create ng-package.json
Next, create a `ng-package.json` file in the root of your project with the following content:
```json
{
"$schema": "./node_modules/ng-packagr/ng-package.schema.json",
"allowedNonPeerDependencies": [
"@angular/common",
"@angular/core",
"@angular/forms",
"@angular/platform-browser",
"@angular/router",
"@angular/service-worker",
"@awesome-cordova-plugins/core",
"@awesome-cordova-plugins/in-app-browser",
"@capacitor/android",
"@capacitor/app",
"@capacitor/core",
"@capacitor/device",
"@capacitor/haptics",
"@capacitor/ios",
"@capacitor/keyboard",
"@capacitor/splash-screen",
"@capacitor/status-bar",
"@ionic/angular",
"@ionic/storage-angular",
"cordova-plugin-inappbrowser",
"core-js",
"rxjs",
"sw-toolbox",
"wait-on",
"webdriver-manager",
"zone.js"
]
}
```
This configuration file specifies the dependencies that are allowed in the package. The app depends on those packages, so we need to add them inside **allowedNonPeerDependencies**.
## Step 3: Create a Public API File
Create a `public_api.ts` file in the `src` folder to export the components and modules you want to make available for import in other projects. For example:
```typescript
export * from './app/shared/shared.component';
export * from './app/shared/shared.module';
```
## Step 4: Define Components and Modules
Define the components and modules you want to share. Here’s an example of a shared component and module:
### `shared.component.ts`
```typescript
import { Component } from '@angular/core';
@Component({
selector: 'app-shared',
template: `
<div>
<h2>Shared Component</h2>
<p>This is a shared component created for reuse.</p>
</div>
`
})
export class SharedComponent { }
```
### `shared.module.ts`
```typescript
import { NgModule } from '@angular/core';
import { CommonModule } from '@angular/common';
import { SharedComponent } from './shared.component';
@NgModule({
declarations: [
SharedComponent
],
imports: [
CommonModule
],
exports: [
SharedComponent
]
})
export class SharedModule { }
```
## Step 5: Update package.json Scripts
Add the following script to your `package.json`:
```json
"scripts": {
"package": "ng-packagr -p ng-package.json"
}
```
Run this script to generate the package in the `dist` folder:
```sh
npm run package
```
## Step 6: Link the Package Locally
Once the package is generated, navigate to the `dist` folder and create a link to reuse the package locally:
```sh
cd dist
npm link
```
## Step 7: Consume the Library in Another Project
In the project where you want to use the library, run the following command to link the library:
```sh
npm link ionic-conference-app
```
Import the necessary components and modules from the library and use them in your project. If you encounter build errors during execution, add the following to `angular.json` to resolve symlink issues:
```json
"architect": {
"build": {
"options": {
"preserveSymlinks": true
}
}
}
```
## Step 8: Make Changes and Rebuild the Package
If you need to make changes to your library package, update the code as needed and then run the packaging script again to generate the updated package:
1. Make your changes to the components, modules, or any other part of the library.
2. Run the packaging script to rebuild the package:
```sh
npm run package
```
## Conclusion
By following these steps, you can efficiently create a library package from an existing Angular application and reuse components and modules across different projects. This approach not only promotes code reuse but also simplifies maintenance and updates. Happy coding! | jcarloscandela |
1,889,825 | Vue.js Loyihamizning tuzilmasi haqida. | ﷽ Assalamu alaykum! Vue.js loyihasi Vite orqali yaratilganda, loyihaning tuzilmasi quyidagicha... | 0 | 2024-06-15T20:53:28 | https://dev.to/mukhriddinweb/vuejs-loyihamizning-tuzilmasi-haqida-3cek | webdev, javascript, programming, vue | ﷽
Assalamu alaykum!
Vue.js loyihasi Vite orqali yaratilganda, loyihaning tuzilmasi quyidagicha bo'ladi. Har bir katalog va faylning maqsadi va vazifalari haqida batafsil tanishamiz.
```
my-app/
├── node_modules/
├── public/
│ └── vite.svg
├── src/
│ ├── assets/
│ │ └── vue.svg
│ ├── components/
│ │ └── HelloWorld.vue
│ ├── App.vue
│ ├── main.js
├── .gitignore
├── index.html
├── package.json
├── README.md
└── vite.config.js
```
### Loyihaning asosi
#### `node_modules/`
Bu katalogda loyihamizni barcha bog'liq package va modullari saqlanadi. `npm install` buyruği bajarilganda, barcha kerakli paketlar shu katalogga yuklanadi.
#### `public/`
Bu katalog loyihamizni umumiy statik fayllarini saqlaydi. Bu katalogdagi fayllar ilova tuzilayotganda o'zgartirilmasdan oxirgi tuzilmaga ko'chiriladi. Misol uchun, `vite.svg` fayli.
#### `src/`
Loyihamizning asosiy manba kodi shu katalogda joylashgan. Barcha komponentlar, stillar , rasmlar va boshqa resurslar shu yerda saqlanadi.
##### `src/assets/`
Bu katalogda loyihamizning rasmlari, shriftlar, va boshqa statik resurslari saqlanadi. Misol uchun, `vue.svg` fayli.
##### `src/components/`
Bu katalogda Vue komponentlari saqlanadi. Har bir komponent alohida `.vue` faylida saqlanadi. Misol uchun, `HelloWorld.vue`.
##### `src/App.vue`
Bu asosiy Vue komponentidir. Bu komponent ilovangizning asosiy tuzilishini va boshqa komponentlarni o'z ichiga oluvchi hisoblanadi.
##### `src/main.js`
Bu fayl ilovamzini ishga tushishi uchun kirish nuqtasi hisoblanadi. Bu faylda Vue ilovasi yaratiladi va asosiy komponent (`App.vue`) ni o'z ichida HTML faylga renderlaydi , bundan tashqar ba'zi css fayllarimizni global holatda ulashimiz mumkin bo'laadi.
```javascript
import { createApp } from 'vue'
// import "./style.css" (misol)
import App from './App.vue'
createApp(App).mount('#app')
```
#### `.gitignore`
Bu faylda Git uchun qaysi fayl va kataloglarni versiya boshqaruviga qo'shmaslik kerakligini belgilab qo'yiladi. Misol uchun, `node_modules` va `dist` kataloglari.
#### `index.html`
Bu ilovamizga kirish uchun asosiy bo'lgan HTML fayl hisoblanadi. Bunda ilovangizni qayerda yuklash kerakligi belgilanadi.
```html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Vite + Vue</title>
</head>
<body>
<div id="app"></div>
<script type="module" src="/src/main.js"></script>
</body>
</html>
```
#### `package.json`
Bu faylda loyihamizning meta ma'lumotlari, bog'liqliklar (dependencies), skriptlar va boshqa sozlamalar saqlanadi. Misol uchun:
```json
{
"name": "my-app",
"version": "0.0.0",
"scripts": {
"dev": "vite",
"build": "vite build",
"serve": "vite preview"
},
"dependencies": {
"vue": "^3.0.0"
},
"devDependencies": {
"vite": "^2.0.0"
}
}
```
#### `README.md`
Bu fayl loyihamiz haqida ma'lumot beruvchi hujjatdir. Bu yerda loyihangizni qanday o'rnatish va ishlatish bo'yicha ko'rsatmalar beriladi.
#### `vite.config.js`
Bu faylda Vite konfiguratsiyasi saqlanadi. Bu faylda tuzilma jarayonini o'zgartirish va kengaytirish mumkin.
```javascript
import { defineConfig } from 'vite'
import vue from '@vitejs/plugin-vue'
// https://vitejs.dev/config/
export default defineConfig({
plugins: [vue()]
})
```
### Qo'shimcha kataloglar va fayllar
### 1. `src/store/`
Agar ilovangizda Vuex yoki Pinia kabi davlat boshqaruv kutubxonalari foydalanilsa, bu katalogda global store boshqaruv fayllari saqlanadi.
### 2. `src/router/`
Agar ilovangizda Vue Router ishlatilsa, bu katalogda (sahifalar yo'llari , qoidalari ) saqlanadi.
### 3. `src/styles/`
Umumiy uslublar saqlanadigan katalog. Misol uchun, global CSS yoki SASS fayllar.
### 4. `src/utils/`
Umumiy yordamchi funksiyalar va boshqa umumiy kodlar uchun katalog.
### Loyihani kengaytirish
Yuqoridagi tuzilma Vue.js ilovangizni boshlash uchun asosiy tuzilma (struktura) . Loyihamiz kattalashgani sayin, qo'shimcha kataloglar va fayllar qo'shishimiz mumkin. Modularizatsiya orqali kodni tashkil qilish, qayta foydalanish va boshqarish oson bo'ladi. Vue.js o'rganishda davom etamiz BaarakAllohu fiikum!
https://t.me/mukhriddinweb
https://khodieff.uz | mukhriddinweb |
1,889,823 | BharatGPT: The Next Generation AI Language Model | Introduction BharatGPT represents a monumental stride in the field of natural language... | 0 | 2024-06-15T20:50:44 | https://dev.to/nashetking/bharatgpt-the-next-generation-ai-language-model-296c | llm, webdev, ai, machinelearning |
## Introduction
BharatGPT represents a monumental stride in the field of natural language processing (NLP) and AI, tailored specifically to understand and generate text in multiple Indian languages with contextual accuracy and cultural relevance. This blog delves into the technical intricacies, working mechanisms, deployment strategies, hardware design, and the collaborative efforts behind BharatGPT, including key contributions from Jio and the Indian Institutes of Technology (IITs).
## Technical Foundation
### Model Architecture
BharatGPT is built upon the GPT-4 architecture, leveraging transformer models which utilize self-attention mechanisms to process and generate human-like text. The model comprises:
- **Encoder-Decoder Layers**: Multiple layers of encoders and decoders that process the input text, capturing intricate patterns and contextual information.
- **Attention Mechanisms**: Self-attention and cross-attention mechanisms that help the model focus on relevant parts of the input sequence, enhancing its understanding of context and relationships between words.
The architecture can be broken down into:
1. **Embedding Layer**: Converts input tokens into dense vectors of fixed size.
2. **Positional Encoding**: Adds positional information to the embeddings to help the model understand the order of tokens.
3. **Multi-Head Attention**: Computes attention scores across different heads, allowing the model to focus on various parts of the input.
4. **Feedforward Neural Networks**: Processes the attention outputs, applying transformations to capture complex patterns.
5. **Layer Normalization and Residual Connections**: Stabilizes and accelerates training.
### Multilingual Training
The model is trained on a diverse corpus containing text in Hindi, Tamil, Bengali, Telugu, Marathi, and other Indian languages. This multilingual training involves:
- **Tokenization**: Utilizing a subword tokenization approach (Byte Pair Encoding or BPE) to handle the diverse scripts and linguistic structures.
- **Pre-training**: Extensive pre-training on a vast dataset, including books, articles, social media content, and more, to capture linguistic nuances and cultural context.
- **Fine-tuning**: Specific fine-tuning tasks to adapt the model for various applications such as translation, summarization, and question-answering.
### Calculations and Parameters
BharatGPT involves a significant number of parameters to ensure its robustness:
- **Number of Layers (L)**: 48 layers
- **Embedding Dimension (d_model)**: 1600 dimensions
- **Number of Attention Heads (h)**: 20 heads
- **Feedforward Dimension (d_ff)**: 6400 dimensions
- **Total Parameters**: Approximately 175 billion parameters
The calculations for the self-attention mechanism are given by:
\[ \text{Attention}(Q, K, V) = \text{softmax}\left(\frac{QK^T}{\sqrt{d_k}}\right) V \]
Where:
- \( Q \) (Query), \( K \) (Key), and \( V \) (Value) are derived from the input embeddings.
- \( d_k \) is the dimension of the key vectors.
The multi-head attention mechanism can be expressed as:
\[ \text{MultiHead}(Q, K, V) = \text{Concat}(\text{head}_1, \ldots, \text{head}_h)W^O \]
Where each head is computed as:
\[ \text{head}_i = \text{Attention}(QW_i^Q, KW_i^K, VW_i^V) \]
\( W_i^Q \), \( W_i^K \), \( W_i^V \), and \( W^O \) are learned weight matrices.
## Working Mechanisms
### Text Generation
The core of BharatGPT's functionality lies in its ability to generate coherent and contextually relevant text. This involves:
1. **Input Processing**: The input text is tokenized and passed through the encoder layers, where self-attention mechanisms help in understanding the context.
2. **Contextual Embeddings**: The model generates contextual embeddings for each token, capturing its meaning in relation to surrounding words.
3. **Decoding**: Using these embeddings, the decoder generates the output sequence, one token at a time, while maintaining contextual coherence.
### Conversational AI
BharatGPT excels in conversational AI, making it suitable for chatbots and virtual assistants. It handles:
- **Dialogue Management**: Maintaining context across turns in a conversation, ensuring relevant and consistent responses.
- **Intent Recognition**: Identifying user intents and providing appropriate responses or actions.
## Behind the Scenes
### Model Deployment
Deploying BharatGPT involves several critical steps:
1. **Infrastructure Setup**: Utilizing cloud platforms like AWS, Azure, or GCP to provide scalable computing resources.
2. **Containerization**: Using Docker to create portable and consistent environments for the model.
3. **Orchestration**: Employing Kubernetes for automating deployment, scaling, and managing containerized applications.
### Hardware Design
BharatGPT's deployment demands high-performance hardware to ensure efficient processing and quick response times:
- **GPUs**: Leveraging NVIDIA A100 GPUs for their parallel processing capabilities, essential for handling the large-scale computations involved in running transformer models.
- **TPUs**: Google’s Tensor Processing Units (TPUs) are also used for accelerating machine learning workloads, providing an alternative to GPUs.
- **Custom Hardware**: Exploring custom ASICs (Application-Specific Integrated Circuits) tailored for specific NLP tasks to further enhance performance.
### Architecture Diagram
Below is a simplified architecture diagram for BharatGPT:
```
+----------------------+
| Input Tokenizer |
+----------+-----------+
|
v
+----------------------+
| Embedding Layer |
+----------+-----------+
|
v
+----------------------+
| Positional Encoding |
+----------+-----------+
|
v
+----------------------+---------------------+
| Multi-Head Self-Attention (Multi-Layers) |
+----------------------+---------------------+
|
v
+----------------------+---------------------+
| Feedforward Neural Networks (Multi-Layers) |
+----------------------+---------------------+
|
v
+----------------------+
| Output Decoder |
+----------+-----------+
|
v
+----------------------+
| Output Tokens |
+----------------------+
```
## API Integration
To facilitate easy integration into various applications, BharatGPT offers robust APIs:
- **RESTful APIs**: Providing endpoints for text generation, language translation, summarization, and more.
- **GraphQL APIs**: Allowing more flexible and efficient queries, suitable for complex applications.
- **SDKs**: Software Development Kits (SDKs) for popular programming languages like Python, JavaScript, and Java to simplify integration.
## Collaborative Efforts
### Development Team
BharatGPT is the result of a collaborative effort involving:
- **Data Scientists and NLP Researchers**: Leading the research and development of the model, fine-tuning algorithms, and ensuring linguistic diversity.
- **Software Engineers**: Handling the implementation, optimization, and deployment of the model.
- **Linguists and Cultural Experts**: Providing insights into linguistic nuances and cultural contexts to enhance the model's relevance and accuracy.
### Jio's Contribution
Reliance Jio, one of India's largest telecommunications companies, played a crucial role in the development and deployment of BharatGPT:
- **Data Infrastructure**: Jio provided robust data infrastructure and cloud services, ensuring scalable and reliable computing resources for training and deploying the model.
- **Connectivity**: Leveraging Jio's extensive network to enable widespread access to BharatGPT, particularly in rural and underserved areas.
- **Research Collaboration**: Partnering with academic institutions and providing funding and resources for cutting-edge research in NLP and AI.
### IITs' Involvement
The Indian Institutes of Technology (IITs) were instrumental in the research and development of BharatGPT:
- **Expertise**: Leading researchers and professors from IITs contributed their expertise in machine learning, NLP, and data science.
- **Data Curation**: Collaborating on the collection and curation of diverse linguistic datasets, ensuring comprehensive coverage of Indian languages.
- **Algorithm Development**: Developing and refining algorithms to enhance the model's performance and accuracy, especially for complex linguistic structures unique to Indian languages.
## Conclusion
BharatGPT stands as a testament to the advancements in AI and NLP, tailored specifically for the rich and diverse linguistic landscape of India. With cutting-edge technology, robust deployment strategies, and a dedicated team of experts, BharatGPT is poised to revolutionize how AI interacts with and understands Indian languages. Whether it's for conversational AI, content generation, or language translation, BharatGPT offers unparalleled capabilities, making it an invaluable tool in the digital transformation of India.
The collaboration between industry leaders like Jio and academic powerhouses like the IITs underscores the importance of synergy in technological innovation. Together, they have not only created a powerful AI model but also paved the way for future advancements that will continue to drive India's technological progress. | nashetking |
1,889,821 | Safely Handling HTML in React | Safely Handling HTML in React: html-react-parser vs dangerouslySetInnerHTML When working... | 0 | 2024-06-15T20:46:27 | https://dev.to/joshydev/safely-handling-html-in-react-ba | webdev, javascript, react, mongodb | ### Safely Handling HTML in React: `html-react-parser` vs `dangerouslySetInnerHTML`
When working with React, there are times when you need to render HTML content dynamically. Whether it's content fetched from an API, user-generated content, or from a database. Handling HTML strings safely and efficiently is crucial. This article explores two common methods for rendering HTML in React: using `html-react-parser` and `dangerouslySetInnerHTML`, along with the importance of sanitizing HTML using DOMPurify.
#### Method 1: `html-react-parser`
**`html-react-parser`** is a popular library that converts HTML strings into React elements. It offers several advantages, especially in terms of security and control over the HTML content.
**Pros:**
1. **Element Transformation**: It allows for transforming elements during parsing, enabling you to manipulate the DOM structure or attributes as needed.
2. **Ease of Use**: The API is straightforward, making it easy to integrate into your project.
3. **Selective Parsing**: Provides control over which parts of the HTML to parse and render.
**Cons:**
1. **Performance Overhead**: Parsing and converting HTML strings to React elements can introduce some performance overhead.
2. **Bundle Size**: Adding this dependency increases your bundle size, potentially affecting load times.
3. **Complexity**: For very simple use cases, using a library might be overkill compared to the straightforward approach of `dangerouslySetInnerHTML`.
**Example Usage:**
```javascript
import React from 'react';
import parse from 'html-react-parser';
const MyComponent = ({ htmlString }) => {
return <div>{parse(htmlString)}</div>;
};
```
#### Method 2: `dangerouslySetInnerHTML`
**`dangerouslySetInnerHTML`** is a built-in React feature that allows you to set HTML directly. Despite its name, it can be used safely with proper precautions.
**Pros:**
1. **Performance**: Directly setting the inner HTML can be more performant since it involves fewer processing steps.
2. **Simplicity**: For straightforward cases, it is very simple and requires no additional dependencies.
**Cons:**
1. **Security Risk**: It exposes your application to XSS attacks if the HTML content is not properly sanitized.
2. **Lack of Control**: Offers less control over the HTML content being rendered.
**Example Usage:**
```javascript
const MyComponent = ({ htmlString }) => {
return <div dangerouslySetInnerHTML={{ __html: htmlString }} />;
};
```
### The Importance of DOMPurify
When using `dangerouslySetInnerHTML`, it is crucial to sanitize the HTML strings to prevent XSS attacks. [DOMPurify](https://github.com/cure53/DOMPurify) is a robust library that cleans HTML content by removing or neutralizing potentially dangerous scripts or tags.
**Installing DOMPurify:**
```bash
npm install dompurify
```
**Example Usage with `dangerouslySetInnerHTML`:**
```javascript
import React from 'react';
import DOMPurify from 'dompurify';
const MyComponent = ({ htmlString }) => {
const sanitizedHtml = DOMPurify.sanitize(htmlString);
return <div dangerouslySetInnerHTML={{ __html: sanitizedHtml }} />;
};
```
### Conclusion
Choosing between `html-react-parser` and `dangerouslySetInnerHTML` depends on your specific use case:
- **Use `html-react-parser`**: If you need safer HTML parsing with transformation capabilities and can afford the performance and bundle size trade-offs.
- **Use `dangerouslySetInnerHTML`**: If you need a simple and performant way to inject HTML, but ensure you sanitize the HTML using a library like DOMPurify to mitigate security risks.
In most cases, `html-react-parser` provides a good balance of safety and flexibility. However, for maximum security when directly injecting HTML, always sanitize your input with DOMPurify.
By understanding these methods and their implications, you can make informed decisions on how to handle HTML content safely and efficiently in your React applications. | joshydev |
1,889,624 | Mathematics secret behind AI on Digit Recognition | Introduction Hi everyone! I’m devloker, and today I’m excited to share a project I’ve been... | 0 | 2024-06-15T20:45:29 | https://dev.to/devloker/mathematics-secret-behind-ai-on-digit-recognition-49lc | # Introduction
Hi everyone! I’m [devloker](https://www.dev-loker.com), and today I’m excited to share a project I’ve been working on: a digit recognition system implemented using pure math functions in Python. This project aims to help beginners grasp the mathematics behind AI and digit recognition without relying on high-level libraries like [TensorFlow](https://www.tensorflow.org/) or [PyTorch](https://pytorch.org/).
You can find the complete code on my [GitHub repository](https://github.com/DEVLOKER/Pure-Math-Digit-Recognition).
# Fundamental concepts in AI world
## Artificial Intelligence (AI)
Artificial Intelligence (AI) is a broad field of computer science focused on creating systems capable of performing tasks that typically require human intelligence. These tasks include problem-solving, understanding natural language, recognizing patterns, and making decisions. AI can be categorized into several subdomains, each with its own focus and techniques.
## Artificial Neural Networks (ANN)
Artificial Neural Networks are a type of machine learning model inspired by the structure and function of the human brain. They consist of layers of interconnected nodes (or neurons), each performing simple computations.
# Neuron
Neurons are the basic building blocks of artificial neural networks, inspired by biological neurons in the human brain. In AI, a neuron is a mathematical function that receives one or more inputs, applies weights to these inputs, sums them up, applies an activation function, and produces an output. In the context of artificial neural networks, a neuron performs the following operations:
- **Input Features**: The neuron takes multiple input features, each input represents a characteristic or attribute of the input data which represented as: `x1 ,x2 , ..., xn`.
- **Weights**: Each input feature is associated with a weight `w1, w2, ...,wn`. which indicates the importance of the feature in making the prediction. During training, these weights are adjusted to learn the optimal values.
- **Summation Function**: Each input is multiplied by its weight, the weighted inputs are summed together, often with an added bias term: `z = sum(xi * wi for xi, wi in zip(x, w)) + b`
- **Bias**: The bias b is an additional parameter that allows to make adjustments that are independent of the input, which helps the model make accurate predictions.
- **Activation Function**: This function decides whether the neuron should be fired or not based on weighted sum, introducing non-linearity to the model. Common activation functions include _softmax_, _sigmoid_, and _ReLU_ _(Rectified Linear Unit)_.
- **Output**: the neuron's output is the obtained result after applying the activation function. This output can be fed as input to the next layer of neurons or can be the final output in the case of the output layer, the final output represents the decision or prediction based on the input and the weights.
These operations work together to enable a neuron to learn and make predictions, while a single neuron can only solve linearly separable problems, combining multiple neurons into layers allows the creation of more complex models capable of solving non-linear problems. This structure forms the basis of multi-layer neural networks used in deep learning.
## Deep Learning (DL)
Deep Learning is a subfield of machine learning that focuses on neural networks with many layers (hence "deep" networks). These networks are capable of learning from vast amounts of data and can model complex, high-dimensional patterns. Deep learning has been particularly successful in fields like speech & image recognition, natural language processing, medical diagnosis, and game playing. These models require vast amounts of data and computational power to train effectively but can achieve remarkable accuracy and performance.
Deep learning models consist of multiple layers of neurons. The common types of layers include:
- **Input Layer**: The first layer, which receives the initial data (e.g., pixel values of an image).
- **Hidden Layers**: Intermediate layers that transform the input of previous layer into more abstract representations through weighted connections and activation functions.
- **Output Layer**: The final layer, which produces the final prediction or classification (e.g., the probabilities of each digit in digit recognition).
Training deep networks involves adjusting the weights and biases of the network to minimize the error in predictions. This is done using backpropagation and optimization algorithms like [gradient descent](https://en.wikipedia.org/wiki/Gradient_descent).
- **Forward Propagation**: Calculate the output of the network for given inputs.
- **Loss Computation**: Measure the error between the predicted output and the actual output.
- **Backword Propagation**: Compute the gradient of the loss function with respect to each weight and bias, propagating the error backward through the network.
- **Weight Update**: during training, the perceptron learns by adjusting its weights and bias based on the difference between the predicted output and the true output.
Types of Deep Neural Networks:
- **Feedforward Neural Networks (FNNs)**: The simplest type where connections between the nodes do not form a cycle.
- **Convolutional Neural Networks (CNNs)**: Primarily used for image processing, recognizing patterns using convolutional layers.
- **Recurrent Neural Networks (RNNs)**: Suitable for sequence data like time series or text, where outputs from previous steps are fed as inputs to the next step.
- **Generative Adversarial Networks (GANs)**: Consist of two networks (generator and discriminator) that compete against each other, useful for generating synthetic data.
# Digits recognition process
Digit recognition is a classic application of neural networks where the goal is to correctly identify handwritten digits (0-9) from images. This task involves several key steps:
##1. Preparing the Data
To start with digit recognition, we first need to prepare our data. We'll be using the [MNIST dataset](https://en.wikipedia.org/wiki/MNIST_database), a standard dataset consisting of 60,000 training images and 10,000 testing images of handwritten digits (0-9).
- **Loading the Data**: Load the MNIST dataset, which contains images of handwritten digits.
- **Normalizing**: Normalization involves scaling pixel values to a range of 0 to 1. This helps the model converge faster during training. Each pixel value, originally between 0 and 255, is divided by 255.
- **Reshaping**: Each image in the MNIST dataset is 28x28 pixels. We'll reshape these 2D arrays into 1D vectors of 784 elements (28 * 28). This reshaped vector will serve as the input features for our model.
Here’s a sample code snippet for data preparation:
```python
import numpy as np
from keras.datasets import mnist
# Load the MNIST dataset
(X_train, y_train), (X_test, y_test) = mnist.load_data()
# Normalize the images to values between 0 and 1
X_train = X_train / 255.0
X_test = X_test / 255.0
# Reshape the images from (28, 28) to (784,)
X_train = X_train.T.reshape(-1, 784)
X_test = X_test.T.reshape(-1, 784)
```
- _X_train_: A numpy array containing the training images. Each image is a _28x28_ pixel grayscale image of a handwritten digit (0-9). The shape of _X_train_ is typically _(60000, 28, 28)_, where _60000_ is the number of training images.
- _Y_train_: A numpy array containing the labels for the training images. Each label is an integer (0-9) representing the digit shown in the corresponding training image. The shape of _Y_train_ is typically _(60000,)_, where _60000_ is the number of training labels.
- _X_test_: A numpy array containing the testing images. Similar to _X_train_, each image is a _28x28_ pixel grayscale image. The shape of X_test is typically _(10000, 28, 28)_, where _10000_ is the number of testing images.
- _Y_test_: A numpy array containing the labels for the testing images. Each label is an integer _(0-9)_ representing the digit shown in the corresponding testing image. The shape of _Y_test_ is typically _(10000,)_, where _10000_ is the number of testing labels.
##2. Model Architecture
Our neural network will consist of an input layer, two hidden layers, and an output layer. The structure and sizes of weights and biases for each layer are as follows:
- **Input Layer**: _784_ neurons (one for each pixel in the image).
- **Hidden Layer 1**: _10_ neurons.
- Each neuron is connected with _784_ input neurons from the previous layer, so have _10*784_ different weights, and we can store them in a matrix _W1_ with size of _(10, 784)_.
- Each neuron has own bais, in total we have _10_ different biases, and we can store them in vector _B1_ with size of _(10,1)_.
- **Hidden Layer 2**: _10_ neurons.
- Each neuron is connected with _784_ input neurons from the previous layer, so have _10*10_ different weights, and we can store them in a matrix _W2_ with size of _(10, 10)_.
- Each neuron has own bais, in total we have _10_ different biases, and we can store them in vector _B2_ with size of _(10,1)_.
- **Output Layer**: _10_ neurons (one for each digit _0-9_).
- Each digit assigns by one neuron, and each neuron represents the probability of the assigned digit.
- the predicted digit is the one corresponding to the neuron with the highest probability.
Here’s the structure of our model:
```python
# Initialize weights and biases
W1 = np.random.rand(10, 784)
B1 = np.random.rand((10, 1))
W2 = np.random.rand(10, 10)
B2 = np.random.rand((10, 1))
```
##3. Training the Model
Training the model involves forward propagation, loss and accuracy calculation, backward propagation, and updating weights and biases.
```
Initialize the neural network's weights W1, W2 and biases B1, B2 with random float between 0 and 1.
For each epoch from 1 to epochs (inclusive):
- Forward Propagation: Compute the activations A1 and A2 (output of each layer) using the current weights and biases.
- Compute error: quantifies the error in the predictions using output A2 and the true labels Y_train.
- Compute Accuracy, which is the proportion of correctly predicted labels (evaluate the performance of the model).
- Backward Propagation: compute the gradients of the error with respect to the weights and biases. Witch indicate how much each parameter needs to change to reduce the error.
- Update the model parameters: Adjust the weights W1, W2 and biases B1, B2 using the computed gradients and the learning rate.
End For Loop
Return the last version of the trained model parameters (weights W1, W2 and biases B1, B2)
```
**Forward Propagation**: Calculating the activations of each layer using the weights and biases. We'll use the ReLU (Rectified Linear Unit) activation function for the hidden layers and softmax for the output layer.
```python
def relu(Z):
return np.maximum(0, Z)
def softmax(Z):
exp_z = np.exp(Z - np.max(Z))
return exp_z / exp_z.sum(axis=0, keepdims=True)
def forward_propagation(X):
Z1 = np.dot(W1, X) + B1
A1 = relu(Z1)
Z2 = np.dot(W2, A1) + B2
A2 = softmax(Z2)
return Z1, A1, Z2, A2
```
**Loss and Accuracy Calculation**: Using cross-entropy loss to measure the model's performance and calculating accuracy.
```python
def compute_loss(A2, Y):
m = Y.size
return -np.sum(np.log(A2[Y, np.arange(m)]))/ m
def compute_accuracy(A2, Y):
predictions = np.argmax(A2, axis=0)
return np.sum(predictions == Y)/Y.size
```
**Backward Propagation**: Calculating gradients using derivatives to adjust the weights and biases. The chain rule is applied here.
```python
def backward_propagation(X, Y, A1, A2):
m = X.shape[1]
dZ2 = A2 - Y
dW2 = np.dot(dZ2, A1.T) / m
dB2 = np.sum(dZ2, axis=1, keepdims=True) / m
dZ1 = W2.T.dot(dZ2) * (A1>0)
dW1 = np.dot(dZ1, X.T) / m
dB1 = np.sum(dZ1, axis=1, keepdims=True) / m
return dW1, dB1, dW2, dB2
def update_parameters(dW1, dB1, dW2, dB2, learning_rate):
W1 -= learning_rate * dW1
B1 -= learning_rate * dB1
W2 -= learning_rate * dW2
B2 -= learning_rate * dB2
```
**Training Loop**: Iteratively performing forward and backward propagation, and updating weights and biases.
```python
learning_rate = 0.01
epochs = 1000
for epoch in range(epochs):
A1, A2 = forward_propagation(X_train)
loss = compute_loss(A2, y_train)
accuracy = compute_accuracy(A2, y_train)
dW1, dB1, dW2, dB2 = backward_propagation(X_train, y_train, A1, A2)
W1, B1, W2, B2 = update_parameters(W1, B1, W2, B2, dW1, dB1, dW2, dB2, learning_rate)
# print results for each 10 iterations
if epoch % 10 == 0:
print(f'Epoch {epoch}, Loss: {loss}, Accuracy: {accuracy}')
```
##4. Evaluating and Reusing the Model
After training, we evaluate the model's performance on the test set and discuss how to save and reuse the model.
**Saving the Model**: The trained model, represented by its weights and biases, can be saved to a file for future use.
```python
import pickle
model_parameters = {'W1': W1, 'B1': B1, 'W2': W2, 'B2': B2}
with open('digit_recognition_model.pkl', 'wb') as file:
pickle.dump(model_parameters, file)
```
**Loading and Evaluating the Model**: Load the saved model and evaluate its performance.
In the context of digit recognition and neural networks, _accuracy_ is a key metric used to evaluate the performance of the model. It represents the proportion of correctly predicted digits out of the total number of predictions made. High accuracy indicates that the model is effectively learning and generalizing from the training data to make correct predictions on unseen data.
```python
with open('digit_recognition_model.pkl', 'rb') as file:
model_parameters = pickle.load(file)
W1 = model_parameters['W1']
B1 = model_parameters['B1']
W2 = model_parameters['W2']
B2 = model_parameters['B2']
# Evaluate the model on the test set
A1, A2 = forward_propagation(X_test)
test_accuracy = compute_accuracy(A2, y_test)
print(f'Test Accuracy: {test_accuracy}')
```
By following these steps, we can build, train, and evaluate a neural network for digit recognition using the MNIST dataset. This process highlights the importance of data preparation, model architecture, training, and evaluation in developing effective machine learning models.
# The implementation overview
In this section, we will describe the implementation of a digit recognition system using Python. The system consists of two main components:
**User Interface (UI)**: Built using _PyQt6_, this provides an interactive interface for drawing digits, training the model using (_epochs_, _target accuracy_ and _learning rate_) parameters, loading a pre-trained model, and predicting the drawn digit.
**Backend Script**: Contains the _NeuralNetworkModel_ class, which handles the core functionalities of training the model and making predictions.
run main python file `app.py`
Configure the training parameters (_epochs_, _target accuracy_, and _learning rate_) and click on the "Train" button, or alternatively, load a pre-trained model using the "Load" button.
**Important**: For optimal results, ensure you train your model until achieving a high accuracy (e.g. greater than _95%_) by setting the target accuracy to _0.95_. Note that reaching high training accuracy may require a significant amount of time (several minutes or longer).
Once trained, draw a digit on the left side (e.g., **6**), and click the "Recognize" button. The system will display the probability for each digit, with the highest probability indicating the most likely digit (e.g. digit: **6**, probability: **97.04%**).
# Conclusion
By implementing digit recognition using pure math functions, we’ve demystified the math behind AI. I hope this helps you understand the fundamentals and encourages you to dive deeper into the world of machine learning.
You can find the complete code on my [GitHub repository](https://github.com/DEVLOKER/Pure-Math-Digit-Recognition).
For further reading, check out this video [But what is a neural network? | Chapter 1, Deep learning](https://www.youtube.com/watch?v=aircAruvnKk)
| devloker |
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