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 |
|---|---|---|---|---|---|---|---|---|
1,868,344 | Develop an image editor using fabric.js 【series】 | Preview Github https://github.com/nihaojob/vue-fabric-editor Quickly develop an image editor... | 0 | 2024-05-29T02:47:52 | https://dev.to/nihaojob/develop-an-image-editor-using-fabricjs-series-1lob | webdev, javascript, opensource |
[Preview](https://nihaojob.github.io/vue-fabric-editor/#/)
[Github](https://github.com/nihaojob/vue-fabric-editor)
https://github.com/nihaojob/vue-fabric-editor
- [Quickly develop an image editor using fabric.js](https://juejin.cn/post/7155040639497797645) Chinese
- [fabric.js develops a detailed implementation of the image editor](https://juejin.cn/post/7199849226745430076) Chinese
- [What can a fabric.js image editor achieve? Dotu](https://juejin.cn/post/7222141882515128375) Chinese
- [My open source projects and open source experiences to share](https://juejin.cn/post/7224765991896121401) Chinese
- [What does the Canvas library fabric.js do? GIF introduction](https://juejin.cn/post/7336743827827015731) Chinese | nihaojob |
1,868,342 | Help im stuck | I've been self-studying software development for 3 years now and I feel like I have the basics but... | 0 | 2024-05-29T02:39:00 | https://dev.to/jth1903/help-im-stuck-1k1m | programming, learning, help | I've been self-studying software development for 3 years now and I feel like I have the basics but I'm stuck feeling scared to start anything as far as a project is concerned. I like game development and blockchain technology. It just all seems so complicated, and I can't seem to start.
Any help will be greatly appreciated. | jth1903 |
1,868,341 | Day 1: Getting Started with HTML | Welcome to the first day of your journey to mastering HTML and CSS! In this blog post, we'll cover... | 0 | 2024-05-29T02:31:47 | https://dev.to/dipakahirav/day-1-getting-started-with-html-1dj1 | html, css, javascript, beginners | Welcome to the first day of your journey to mastering HTML and CSS! In this blog post, we'll cover the basics of HTML, the fundamental language for creating web pages. By the end of this post, you'll have created your very first HTML page.
#### What is HTML?
HTML (HyperText Markup Language) is the standard language used to create and design documents on the web. It structures the content, which includes text, images, links, and other media, to be displayed in web browsers.
#### Structure of an HTML Document
Every HTML document has a basic structure, which includes several essential elements. Here's a simple example of an HTML document:
```html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>My First HTML Page</title>
</head>
<body>
<h1>Hello, World!</h1>
<p>Welcome to my first HTML page.</p>
</body>
</html>
```
Let's break down the components:
- `<!DOCTYPE html>`: This declaration defines the document type and version of HTML.
- `<html lang="en">`: The root element of an HTML page, with the `lang` attribute specifying the language.
- `<head>`: Contains meta-information about the document, such as the character set and the title.
- `<meta charset="UTF-8">`: Specifies the character encoding for the document.
- `<meta name="viewport" content="width=device-width, initial-scale=1.0">`: Ensures the webpage is responsive on different devices.
- `<title>`: Sets the title of the webpage, which appears in the browser tab.
- `<body>`: Contains the content of the webpage, visible to users.
#### Creating Your First HTML Page
1. **Set Up Your Environment**:
- You only need a text editor (like Notepad on Windows or TextEdit on Mac) and a web browser (like Chrome, Firefox, or Safari).
2. **Write Your HTML**:
- Open your text editor and type the HTML code shown above.
3. **Save Your File**:
- Save the file with an `.html` extension. For example, `index.html`.
4. **Open Your HTML File in a Browser**:
- Double-click the saved file or right-click and choose "Open with" and select your browser.
You should see a page with the heading "Hello, World!" and a paragraph that says, "Welcome to my first HTML page."
#### Basic HTML Tags
Here are some fundamental HTML tags you'll use frequently:
- **Headings**: Define headings with `<h1>` to `<h6>`.
```html
<h1>Main Heading</h1>
<h2>Subheading</h2>
```
- **Paragraphs**: Define paragraphs with `<p>`.
```html
<p>This is a paragraph.</p>
```
- **Links**: Create hyperlinks with `<a>`.
```html
<a href="https://www.example.com">Visit Example</a>
```
- **Images**: Embed images with `<img>`.
```html
<img src="image.jpg" alt="Description of image">
```
#### Summary
In this first blog post, we introduced HTML and its basic structure. You learned how to create a simple HTML document and understood the purpose of essential HTML tags. In the next post, we'll dive deeper into text formatting and links, helping you build more structured content.
Stay tuned for Day 2, where we'll continue our HTML journey. Happy coding!
---
*Follow me for more tutorials and tips on web development. Feel free to leave comments or questions below!*
#### Follow and Subscribe:
- **Website**: [Dipak Ahirav] (https://www.dipakahirav.com)
- **Email**: dipaksahirav@gmail.com
- **Instagram**: [devdivewithdipak](https://www.instagram.com/devdivewithdipak)
- **YouTube**: [devDive with Dipak](https://www.youtube.com/@DevDivewithDipak)
- **LinkedIn**: [Dipak Ahirav](https://www.linkedin.com/in/dipak-ahirav-606bba128)
| dipakahirav |
1,867,860 | Stay Updated with Python/FastAPI/Django: Weekly News Summary (20/05/2024-26/05/2024) | Dive into the latest tech buzz with this weekly news summary, focusing on Python, FastAPI, and Django... | 0 | 2024-05-29T02:00:00 | https://poovarasu.dev/python-fastapi-django-weekly-news-summary-20-05-2024-to-26-05-2024/ | python, django, fastapi, flask | Dive into the latest tech buzz with this weekly news summary, focusing on Python, FastAPI, and Django updates from May 20th to May 26th, 2024. Stay ahead in the tech game with insights curated just for you!
This summary offers a concise overview of recent advancements in the Python/FastAPI/Django framework, providing valuable insights for developers and enthusiasts alike. Explore the full post for more in-depth coverage and stay updated on the latest in Python/FastAPI/Django development.
Check out the complete article here https://poovarasu.dev/python-fastapi-django-weekly-news-summary-20-05-2024-to-26-05-2024/ | poovarasu |
1,868,339 | FMZ Quant: An Analysis of Common Requirements Design Examples in the Cryptocurrency Market (I) | In the cryptocurrency asset trading space, obtaining and analyzing market data, querying rates, and... | 0 | 2024-05-29T02:26:20 | https://dev.to/fmzquant/fmz-quant-an-analysis-of-common-requirements-design-examples-in-the-cryptocurrency-market-i-3omb | cryptocurrency, analysis, trading, fmzquant | In the cryptocurrency asset trading space, obtaining and analyzing market data, querying rates, and monitoring account asset movements are all critical operations. Below are code examples of implementations for some common requirements.
## 1. How do I write the code about getting the currency with the highest increase in 4 hours on Binance Spot?
When writing a quantitative trading strategy program on FMZ platform, the first thing you need to do when you encounter a requirement is to analyze it. So based on the requirements, we analyzed the following contents:
- Which programming language to use?
The plan is to use Javascript to implement it.
- Requires spot real-time quotes in all currencies
The first thing we did when we saw the requirement was to look up Binance API document to find out if there was any aggregated quotes (it's best to have aggregated quotes, it's a lot of work to look up one by one).
We found the aggregated quotes interface: GET https://api.binance.com/api/v3/ticker/price.
On FMZ platform, use the HttpQuery function to access the exchange ticker interface (public interface that does not require a signature).
- Need to count data for a rolling window period of 4 hours
Conceptualize how to design the structure of the statistical program.
- Calculate price fluctuations and sort them
Thinking about the price fluctuations algorithm, is it: price fluctuations (%) = (current price - initial price) / initial price * 100 in "%".
After figuring out the problem, as well as defining the program. We then got down to the business of designing the program.
### Code Design
```
var dictSymbolsPrice = {}
function main() {
while (true) {
// GET https://api.binance.com/api/v3/ticker/price
try {
var arr = JSON.parse(HttpQuery("https://api.binance.com/api/v3/ticker/price"))
if (!Array.isArray(arr)) {
Sleep(5000)
continue
}
var ts = new Date().getTime()
for (var i = 0; i < arr.length; i++) {
var symbolPriceInfo = arr[i]
var symbol = symbolPriceInfo.symbol
var price = symbolPriceInfo.price
if (typeof(dictSymbolsPrice[symbol]) == "undefined") {
dictSymbolsPrice[symbol] = {name: symbol, data: []}
}
dictSymbolsPrice[symbol].data.push({ts: ts, price: price})
}
} catch(e) {
Log("e.name:", e.name, "e.stack:", e.stack, "e.message:", e.message)
}
// Calculate price fluctuations
var tbl = {
type : "table",
title : "Price fluctuations",
cols : ["trading pair", "current price", "price 4 hours ago", "price fluctuations", "data length", "earliest data time", "latest data time"],
rows : []
}
for (var symbol in dictSymbolsPrice) {
var data = dictSymbolsPrice[symbol].data
if (data[data.length - 1].ts - data[0].ts > 1000 * 60 * 60 * 4) {
dictSymbolsPrice[symbol].data.shift()
}
data = dictSymbolsPrice[symbol].data
dictSymbolsPrice[symbol].percentageChange = (data[data.length - 1].price - data[0].price) / data[0].price * 100
}
var entries = Object.entries(dictSymbolsPrice)
entries.sort((a, b) => b[1].percentageChange - a[1].percentageChange)
for (var i = 0; i < entries.length; i++) {
if (i > 9) {
break
}
var name = entries[i][1].name
var data = entries[i][1].data
var percentageChange = entries[i][1].percentageChange
var currPrice = data[data.length - 1].price
var currTs = _D(data[data.length - 1].ts)
var prePrice = data[0].price
var preTs = _D(data[0].ts)
var dataLen = data.length
tbl.rows.push([name, currPrice, prePrice, percentageChange + "%", dataLen, preTs, currTs])
}
LogStatus(_D(), "\n", "`" + JSON.stringify(tbl) + "`")
Sleep(5000)
}
}
```
### Code Analysis
- 1. Data structure
var dictSymbolsPrice = {}: An empty object to store price information for each trading pair. The key is the symbol of the trading pair, and the value is an object containing the name of the trading pair, an array of price data, and information about the price fluctuations.
- 2. Main function main()
2.1. Infinite loop
```
while (true) {
// ...
}
```
The program continuously monitors the Binance API trading pair prices through an infinite loop.
2.2. Get price information
```
var arr = JSON.parse(HttpQuery("https://api.binance.com/api/v3/ticker/price"))
```
Get the current price information of the trading pair via Binance API. If the return is not an array, wait for 5 seconds and retry.
2.3. Update price data
```
for (var i = 0; i < arr.length; i++) {
// ...
}
```
Iterate through the array of obtained price information and update the data in dictSymbolsPrice. For each trading pair, add the current timestamp and price to the corresponding data array.
2.4. Exception processing
```
} catch(e) {
Log("e.name:", e.name, "e.stack:", e.stack, "e.message:", e.message)
}
```
Catch exceptions and log the exception information to ensure that the program can continue to execute.
2.5. Calculate the price fluctuations
```
for (var symbol in dictSymbolsPrice) {
// ...
}
```
Iterate through dictSymbolsPrice, calculate the price fluctuations of each trading pair, and remove the earliest data if it is longer than 4 hours.
2.6. Sort and generate tables
```
var entries = Object.entries(dictSymbolsPrice)
entries.sort((a, b) => b[1].percentageChange - a[1].percentageChange)
for (var i = 0; i < entries.length; i++) {
// ...
}
```
Sort the trading pairs in descending order of their price fluctuations and generate a table containing information about the trading pairs.
2.7. Log output and delay
```
LogStatus(_D(), "\n", "`" + JSON.stringify(tbl) + "`")
Sleep(5000)
```
Output the table and the current time in the form of a log and wait for 5 seconds to continue the next round of the loop.
The program obtains the real-time price information of the trading pair through Binance API, then calculates the price fluctuations, and outputs it to the log in the form of a table. The program is executed in a continuous loop to realize the function of real-time monitoring of the prices of trading pairs. Note that the program includes exception processing to ensure that the execution is not interrupted by exceptions when obtaining price information.
### Live Trading Running Test
Since data can only be collected bit by bit at the beginning, it is not possible to calculate the price fluctuations on a rolling basis without collecting enough data for a 4-hour window. Therefore, the initial price is used as the base for calculation, and after collecting enough data for 4 hours, the oldest data will be eliminated in order to maintain the 4-hour window for calculating the price fluctuations.
## 2. Check the full variety of funding rates for Binance U-denominated contracts
Checking the funding rate is similar to the above code, first of all, we need to check the Binance API documentation to find the funding rate related interface. Binance has several interfaces that allow us to query the rate of funds, here we take the interface of the U-denominated contract as an example:
```
GET https://fapi.binance.com/fapi/v1/premiumIndex
```
### Code Implementation
Since there are so many contracts, we're exporting the top 10 largest funding rates here.
```
function main() {
while (true) {
// GET https://fapi.binance.com/fapi/v1/premiumIndex
try {
var arr = JSON.parse(HttpQuery("https://fapi.binance.com/fapi/v1/premiumIndex"))
if (!Array.isArray(arr)) {
Sleep(5000)
continue
}
arr.sort((a, b) => parseFloat(b.lastFundingRate) - parseFloat(a.lastFundingRate))
var tbl = {
type: "table",
title: "Top 10 funding rates for U-denominated contracts",
cols: ["contracts", "funding rate", "marked price", "index price", "current rate time", "next rate time"],
rows: []
}
for (var i = 0; i < 9; i++) {
var obj = arr[i]
tbl.rows.push([obj.symbol, obj.lastFundingRate, obj.markPrice, obj.indexPrice, _D(obj.time), _D(obj.nextFundingTime)])
}
LogStatus(_D(), "\n", "`" + JSON.stringify(tbl) + "`")
} catch(e) {
Log("e.name:", e.name, "e.stack:", e.stack, "e.message:", e.message)
}
Sleep(1000 * 10)
}
}
```
The returned data structure is as follows, and check the Binance documentation, it shows that lastFundingRate is the funding rate we want.
```
{
"symbol":"STMXUSDT",
"markPrice":"0.00883606",
"indexPrice":"0.00883074",
"estimatedSettlePrice":"0.00876933",
"lastFundingRate":"0.00026573",
"interestRate":"0.00005000",
"nextFundingTime":1702828800000,
"time":1702816229000
}
```
Live trading running test:
### Getting OKX exchange contract funding rates of Python version
A user has asked for a Python version of the example, and it's for the OKX exchange. Here is an example:
The data returned by the interface https://www.okx.com/priapi/v5/public/funding-rate-all?currencyType=1:
```
{
"code":"0",
"data":[
{
"fundingTime":1702828800000,
"fundingList":[
{
"instId":"BTC-USDT-SWAP",
"nextFundingRate":"0.0001102188733642",
"minFundingRate":"-0.00375",
"fundingRate":"0.0000821861465884",
"maxFundingRate":"0.00375"
} ...
```
Specific code:
```
import requests
import json
from time import sleep
from datetime import datetime
def main():
while True:
# https://www.okx.com/priapi/v5/public/funding-rate-all?currencyType=1
try:
response = requests.get("https://www.okx.com/priapi/v5/public/funding-rate-all?currencyType=1")
arr = response.json()["data"][0]["fundingList"]
Log(arr)
if not isinstance(arr, list):
sleep(5)
continue
arr.sort(key=lambda x: float(x["fundingRate"]), reverse=True)
tbl = {
"type": "table",
"title": "Top 10 funding rates for U-denominated contracts",
"cols": ["contracts", "next rate", "minimum", "current", "maximum"],
"rows": []
}
for i in range(min(9, len(arr))):
obj = arr[i]
row = [
obj["instId"],
obj["nextFundingRate"],
obj["minFundingRate"],
obj["fundingRate"],
obj["maxFundingRate"]
]
tbl["rows"].append(row)
LogStatus(_D(), "\n", '`' + json.dumps(tbl) + '`')
except Exception as e:
Log(f"Error: {str(e)}")
sleep(10)
```
Live trading running test:
### END
These examples provide basic design ideas and calling methods, the actual project may need to make appropriate changes and extensions based on the specific needs. Hopefully, these codes can help you better meet the various needs in cryptocurrency digital asset trading.
From: https://blog.mathquant.com/2023/12/19/fmz-quant-an-analysis-of-common-requirements-design-examples-in-the-cryptocurrency-market-i.html | fmzquant |
1,868,336 | JS Versialari haqida: JS Data types: Variables (O'zgaruvchilar): | JS Versialari: JavaScript tilli dasturlash tili bo'lib, u zamonaviy veb dasturlashning asosi... | 0 | 2024-05-29T02:19:08 | https://dev.to/bekmuhammaddev/js-versialari-haqida-js-data-types-variables-ozgaruvchilar-16fh | javascript, webdev, aripovdev | JS Versialari:
JavaScript tilli dasturlash tili bo'lib, u zamonaviy veb dasturlashning asosi hisoblanadi. JavaScript versiyalari haqida gap ketganda, asosiy e'tibor ECMAScript (ES) standartlariga qaratiladi, chunki bu JavaScript tilining spetsifikatsiyasi hisoblanadi. ECMAScript va JavaScript ko'pincha bir xil deb tushuniladi, lekin ECMAScript standartni bildiradi, JavaScript esa shu standart asosida ishlab chiqilgan til.
JavaScriptning asosiy versiyalari quyidagilardan iborat:
ECMAScript (ES) versiyalari
ES1 (ECMAScript 1) - 1997 yil
Birinchi standart versiyasi, asosiy til xususiyatlari belgilandi.
ES2 (ECMAScript 2) - 1998 yil
Kichik o'zgarishlar va moslikni yaxshilash uchun standart yangilandi.
ES3 (ECMAScript 3) - 1999 yil
Ko'plab yangi xususiyatlar qo'shildi, masalan, oddiy regex qo'llab-quvvatlash va uchlik shart operatori (ternary operator).
ES4 (ECMAScript 4) - Bekor qilingan
Juda keng qamrovli va murakkab edi, shuning uchun hech qachon rasmiy nashr qilinmagan.
ES5 (ECMAScript 5) - 2009 yil
Strict mode, JSON, Array va Object funksiyalarining kengaytirilishi, shuningdek, yangi metodlar qo'shildi.
ES6 (ECMAScript 2015) - 2015 yil
Katta yangilanish. Let va const, class, arrow funksiyalar, template stringlar, promises, generators va modullar kabi ko'plab yangi xususiyatlar qo'shildi.
ES7 (ECMAScript 2016) - 2016 yil
Exponentiation operator (**) va Array.prototype.includes metodlari kiritildi.
ES8 (ECMAScript 2017) - 2017 yil
Async/await, Object.values, Object.entries, string padding va boshqalar qo'shildi.
ES9 (ECMAScript 2018) - 2018 yil
Asynchronous iteration, rest/spread operatorlari objectlar uchun, Promise.finally va boshqa xususiyatlar.
ES10 (ECMAScript 2019) - 2019 yil
Object.fromEntries, string trimming funksiyalari, Array.prototype.flat va flatMap, Symbol.description kabi xususiyatlar qo'shildi.
ES11 (ECMAScript 2020) - 2020 yil
Dynamic import, BigInt, nullish coalescing operator (??), optional chaining (?.), globalThis va boshqalar.
ES12 (ECMAScript 2021) - 2021 yil
Logical assignment operators, numeric separators, WeakRefs, Promise.any va boshqalar.
ES13 (ECMAScript 2022) - 2022 yil
Top-level await, at() metodi, class fields va private methods, static blocks.
JS Data type:
8 ta ma'lumot turi
2 ta gurhuga bo'linadi ( primative & non primative )
PRIMATIVE :
1. string
2. number
3. boolean
4. undefined
5. null
6. bigInteger
7. Symbol
COMPLEX
8. object ( array , object , function , new Class ):
`
1.string:
let str = "string"
let str1 = `string`
ket str2 = 'string'
`
2. Number
11 , 0.11 , -1222 , 31/56 0.00001 number
var num=12;
console.log("10"/"5")
console.log(typeof (num/"a"));
3. Boolean
true , false
var bool=true; // true=1 / false=0
console.log(bool+"string");
console.log(typeof bool+"0")
4. undefined
var myArray
console.log(myArray+true)
console.log(typeof (myArray+true))
5. null
var myNull = null;
0 or null
console.log(myNull-"myNull");
6. BigInteger
var myBigInteger = 1222222222222222222222222222n;
console.log(typeof myBigInteger);
var myBigInteger=BigInt(1111111);
console.log(typeof myBigInteger)
7. Symbol
var a=Symbol("hello");
var b=Symbol("hello");;
console.log(a,b)
console.log(a==b)
VARIABLES ( var , let , const);
1. var (elon qilamiz , qayta elon qila olamiz , qayta qiymat tayinlaymiz)
var a=12;
var a=13;
a=14;
2. let
let b=21;
let b=22; x qayata elon qilaolmaymiz.
b=23; // qayta qiymat tayinlasak bo'ladi.
console.log(b)
3. const (elon qilamiz , qayta elon qila olmaymiz , qayta qiymat tayinlay olmaymiz)
const d=32;
const c=32;
c++
const c=33;
c=34; // qayta qiymat tayinlay olmaymiz.
console.log(c)
console.log(d)
{
var a=33;
console.log(a)
}
let a=23;
let b=a;
b+=a; b=b+a; -> b=23+23
b+=a;
console.log(b)
let c=b;
console.log(a,b,c);
| bekmuhammaddev |
1,737,229 | ¿Como Personalizar Neovim? | Personalizar neovim es una excelente manera de mejorar la productividad y la experiencia al... | 0 | 2024-05-29T02:06:15 | https://dev.to/erickvasm/como-personalizar-neovim-3gg8 | Personalizar neovim es una excelente manera de mejorar la productividad y la experiencia al programar. A continuación, te proporcionaré una guía para personalizar neovim para personas que se están iniciando en este tema.
Cabe destacar que utilizaremos un único archivo para configurar neovim, el cual es el `init.vim`. Pero existen otras formas un poco más complejas, como personalizarlo con Lua, el cual es un lenguaje de programación.
## 1. Instalar un administrador de plugins
Antes de comenzar, asegúrate de tener neovim instalado en tu computadora. Puedes descargarlo desde el repositorio oficial de neovim. Nosotros usaremos a partir de la versión `v0.8.0`.
Para personalizar neovim, necesitarás un administrador de plugins. Un administrador de plugins te permite instalar y administrar plugins de forma sencilla. Hay varios administradores de plugins disponibles, pero el más popular es vim-plug.
Para instalar vim-plug, abre una terminal y ejecuta el siguiente comando:
```bash
curl -fLo ~/.local/share/nvim/site/autoload/plug.vim --create-dirs \\
<https://raw.githubusercontent.com/junegunn/vim-plug/master/plug.vim>
```
## 2. Configurar el archivo init.vim
El archivo `init.vim` es donde configurarás Neovim. Primero, vamos a crear el archivo para personalizar nvim, en la ruta `/home/.config/nvim/init.vim`.
En este archivo se estara organizado en tres secciones:
**- Configuración principal**: aquí se configuran algunas opciones importantes como el soporte de resaltado de sintaxis, el soporte de la opción de autocompletado y la configuración de los colores.
**- Configuración de complementos:** aquí se definen y se cargan todos los complementos que se emplearán en neovim.
**- Configuración personalizada:** esta sección contiene opciones personalizadas y mapeos de teclas. Los mapeos de teclas se emplean para definir atajos para hacer tareas específicas en neovim, como guardar archivos, buscar y reemplazar, abrir pestañas y cargar de nuevo el archivo init.vim.
### 2.1 Fuente
Personalmente recomiendo instalar la fuente JetbrainsMono. Sin embargo, si deseas otra fuente, puedes ingresar a la página oficial de NerdFonts y descargar tu favorita. A mí me gusta Hack Nerd Font o Fira Code. Es importante que sea NerdFont ya que, gracias a este tipo de fuentes, es que podremos ver los iconos en neovim.
Una vez instales la fuente, procura que la terminal que usas, utilice la fuente que descargaste.
## 2.2 Configuración
**1. Habilitar el número de línea**
El número de línea es útil cuando necesitas referirte a una línea específica en tu archivo. Puedes habilitar los números de línea usando el siguiente código:
`set number`
**2. Establecer el espaciado**
El espaciado adecuado ayuda a que el código sea más legible. Puedes establecer el espaciado en neovim con el siguiente código:
``` vim
set tabstop=4
set shiftwidth=4
set expandtab
```
**3. Habilitar la indentación automática**
La indentación automática es útil porque te permite identar tu código de forma rápida y sencilla. Puedes habilitar la indentación automática usando el siguiente código: `filetype indent on`
**4. Temas**
Un tema define la apariencia de Neovim. Puedes elegir entre una amplia variedad de temas, y algunos de los más populares incluyen gruvbox, dracula y nord.
Puedes instalar y establecer un tema usando vim-plug con el siguiente código:
```vim
syntax enable
set background=dark
colorscheme gruvbox
call plug#begin()
Plug 'morhetz/gruvbox'
call plug#end()
```
**5. Instalar plugins**
Una vez que hayas configurado tu archivo init.vim, puedes instalar plugins usando vim-plug. Puedes buscar plugins en sitios como vimawesome y agregarlos a tu archivo init.vim utilizando Plug 'autor/nombre_del_plugin'.
`filetype plugin indent on`
Una vez que hayas agregado tus plugins, puedes instalarlos y actualizarlos usando los siguientes comandos en Neovim:
``` vim
:PlugInstall
:PlugUpdate
```
## 3. Algunos plugins
Coc y Treesitter: es un plugin que proporciona funciones avanzadas de autocompletado y corrección de código para varios lenguajes de programación. Treesitter es un plugin que proporciona análisis sintáctico avanzado para una gran cantidad de lenguajes de programación.
Para instalar Coc, abre Neovim y escribe :CocInstall. A continuación, escribe los nombres de los plugins que deseas instalar, como **coc-tsserver** o **coc-prettier**.
Para instalar Treesitter, escribe :TSInstall en Neovim, y luego escribe los nombres de los plugins que deseas instalar, como java o php.
Algunas de las opciones y los plugin más notables que se configuran son:
**Temas de colores para neovim:**
1. gruvbox
2. onedark.vim
3. palenight.vim
4. nord-vim
5. ayu-vim
**Plugin para mejorar la apariencia de la barra de estado de neovim:**
1. vim-airline
2. barbar.nvim:
**Plugin para explorar y navegar por los archivos en un árbol de directorios:**
1. nerdtree
2. nerdtree-git-plugin
**Plugin para mostrar iconos de archivo en la barra lateral de NERDTree:**
1. vim-devicons
2. nvim-web-devicons:
**Otro Pluggins usados son:**
**1. vim-closetag**: para autocompletar etiquetas HTML y XML.
**2. vim-surround**: para agregar y cambiar los paréntesis, corchetes, llaves y comillas que rodean el texto seleccionado.
**3. nvim-autopairs**: para insertar pares de paréntesis, corchetes, llaves y comillas automáticamente mientras se escribe código.
**4. vim-prettier**: para formatear automáticamente el código JavaScript, CSS, HTML y otros lenguajes.
**5. coc.nvim**: plugin para autocompletar y proporcionar características avanzadas de edición de código para varios lenguajes de programación a través del servidor LSP.
**6. nvim-treesitter**: para un resaltado de sintaxis y análisis de código más avanzados, basado en árboles sintácticos, para muchos lenguajes de programación.
**7. lilydjwg/colorizer**: para resaltar los códigos de color en el archivo.
**8. rainbow_parentheses.vim**: para resaltar los paréntesis y corchetes coincidentes.
**9. telescope.nvim**: para buscar palabras claves.
Aquí hay algunos ajustes básicos que puedes hacer para empezar:
## 4. Resultado
## ¿Cómo quedaría todo el archivo?
``` vim
" ---------------------
" 1. MAIN CONFIGURATION
" ---------------------
filetype plugin indent on
filetype plugin on
set termguicolors
set number
set mouse=a
set numberwidth=1
set clipboard=unnamed
set showcmd
set ruler
set cursorline
set encoding=utf8
set showmatch
set termguicolors
set sw=2
set wrap linebreak
set hlsearch
set incsearch
set ignorecase
set smartcase
set laststatus=2
set noshowmode
" ------------
" 2. VIM-PLUG
" ------------
call plug#begin()
" THEME
Plug 'morhetz/gruvbox'
Plug 'joshdick/onedark.vim'
Plug 'drewtempelmeyer/palenight.vim'
Plug 'arcticicestudio/nord-vim'
Plug 'ayu-theme/ayu-vim'
" TABS
Plug 'vim-airline/vim-airline'
Plug 'romgrk/barbar.nvim'
" TREE
Plug 'scrooloose/nerdtree'
Plug 'Xuyuanp/nerdtree-git-plugin'
" ICONS
Plug 'ryanoasis/vim-devicons'
Plug 'kyazdani42/nvim-web-devicons'
" TYPING
Plug 'alvan/vim-closetag'
Plug 'tpope/vim-surround'
Plug 'windwp/nvim-autopairs'
" PRETTIER
Plug 'prettier/vim-prettier', { 'do': 'yarn install' }
" AUTOCOMPLETE
Plug 'neoclide/coc.nvim', {'branch': 'release'}
" SYNTAX
Plug 'nvim-treesitter/nvim-treesitter', {'do': ':TSUpdate'}
" COLORS
Plug 'lilydjwg/colorizer'
Plug 'junegunn/rainbow_parentheses.vim'
" TELESCOPE
Plug 'nvim-lua/plenary.nvim'
Plug 'nvim-telescope/telescope.nvim', { 'tag': '0.1.0' }
" GIT
Plug 'APZelos/blamer.nvim'
" GITHUBCOPILOT
Plug 'github/copilot.vim'
" IDE
Plug 'numToStr/Comment.nvim'
Plug 'easymotion/vim-easymotion'
Plug 'mhinz/vim-signify'
Plug 'yggdroot/indentline'
Plug 'lukas-reineke/indent-blankline.nvim'
" LSP AND MASON
Plug 'williamboman/mason.nvim'
Plug 'williamboman/mason-lspconfig.nvim'
Plug 'neovim/nvim-lspconfig'
call plug#end()
" -----------------
" 3. CONFIGURATION
" -----------------
" AYU THEME
" let ayucolor="dark"
" MASON VIM
lua require('mason').setup()
lua require('mason-lspconfig').setup()
" GIT BLAME
let g:blamer_enabled = 1
" NERDTree
let NERDTreeQuitOnOpen=1
let g:NERDTreeGitStatusIndicatorMapCustom = {
\ 'Modified' :'✹',
\ 'Staged' :'✚',
\ 'Untracked' :'✭',
\ 'Renamed' :'➜',
\ 'Unmerged' :'═',
\ 'Deleted' :'✖',
\ 'Dirty' :'✗',
\ 'Ignored' :'☒',
\ 'Clean' :'✔︎',
\ 'Unknown' :'?',
\ }
let g:NERDTreeGitStatusUseNerdFonts = 1
let NERDTreeMinimalUI = 1
let NERDTreeDirArrows = 1
let NERDTreeShowHidden = 1
" AIRLINE
let g:airline#extensions#tabline#enabled = 0
let g:airline_section_c_only_filename = 1
let g:airline_section_z = ' %{strftime("%-I:%M %p")}'
let g:airline_section_warning = ''
let g:airline#extensions#tabline#formatter = 'unique_tail'
let g:airline_theme = "onedark"
" PRETTIER
let g:prettier#quickfix_enabled = 0
autocmd TextChanged,InsertLeave *.js,*.jsx,*.mjs,*.ts,*.tsx,*.css,*.less,*.scss,*.json,*.graphql,*.md,*.vue,*.svelte,*.yaml,*.html PrettierAsync
"------------------
" 4. CUSTOM MAPING
"-----------------
let mapleader=" "
" SAVE
nmap <C-s> :w<CR>
nmap <C-q> :q<CR>
" ALL TEXT, PASTE, COPY, RENDO, CUT
nmap <C-v> "+P
nmap <C-a> ggVG
nmap <C-z> :undo<CR>
nmap <C-y> :redo<CR>
nmap <C-x> dd
" SEARCH AND REPLACE
nmap <C-r> :%s///gc<Left><Left>
nmap <C-f> /
" SPLIT S
nmap <Leader>s :vsp<CR>
" INIT.VIM
nmap <leader>r :so ~/.config/nvim/init.vim<CR>
" BUFFERS
nmap <Leader>qq :NERDTreeToggle<CR>
nmap \\ <leader>qq
nmap <Tab> :bnext<CR>
nmap <Leader>t :enew<CR>
nmap <Leader>oo :Buffers<CR>
nnoremap <Leader>q :bdelete<CR>
" SPLIT
nnoremap <Leader>> 10<C-w>>
nnoremap <Leader>< 10<C-w><
" SEARCH FILES
nnoremap <leader>ff <cmd>Telescope find_files<cr>
nnoremap <leader>fg <cmd>Telescope live_grep<cr>
nnoremap <leader>fb <cmd>Telescope buffers<cr>
nnoremap <leader>fh <cmd>Telescope help_tags<cr>
nnoremap <leader>fc <cmd>Telescope colorscheme<cr>
" SCROOLLING
nnoremap <silent> <right> :vertical resize +5<CR>
nnoremap <silent> <left> :vertical resize -5<CR>
nnoremap <silent> <up> :resize +5<CR>
nnoremap <silent> <down> :resize -5<CR>
nmap <Leader>es <Plug>(easymotion-s2)
" DEFINITION.
nmap <silent> gd <Plug>(coc-definition)
nmap <silent> gy <Plug>(coc-type-definition)
nmap <silent> gi <Plug>(coc-implementation)
nmap <silent> gr <Plug>(coc-references)
" PRETTIER
nmap <Leader>p :Prettier<CR>
" THEME TRANSPARENT
function! TransparentBackground()
highlight Normal guibg=NONE ctermbg=NONE
highlight LineNr guibg=NONE ctermbg=NONE
set fillchars+=vert:\│
highlight WinSeparator gui=NONE guibg=NONE guifg=#444444 cterm=NONE ctermbg=NONE ctermfg=gray
highlight VertSplit gui=NONE guibg=NONE guifg=#444444 cterm=NONE ctermbg=NONE ctermfg=gray
endfunction
augroup MyColors
autocmd!
autocmd ColorScheme dracula call DraculaTweaks()
autocmd ColorScheme * call TransparentBackground()
augroup END
color onedark
syntax on
```
## Conclusión
Personalizar neovim es una excelente manera de mejorar la productividad y la experiencia al programar. Con estas configuraciones básicas, podrás comenzar a personalizar neovim según tus necesidades y preferencias. Recuerda que siempre puedes buscar en línea para encontrar más ajustes y plugins avanzados. ¡Feliz programación! | erickvasm | |
1,868,334 | Reliable Connections: Hebei Huatong's UL Cable Offerings | Hebei Huatong's UL Cable Offerings: Secure and Efficient Connections for Your Electrical Needs If... | 0 | 2024-05-29T02:04:37 | https://dev.to/david_villanuevalr_86c0b6/reliable-connections-hebei-huatongs-ul-cable-offerings-igm | cable | Hebei Huatong's UL Cable Offerings: Secure and Efficient Connections for Your Electrical Needs
If you wish to ensure your electrical gadgets function efficiently and securely, you require dependable connections. Hebei Huatong's UL Cable Offerings offer benefits over various other cable televisions in regards to development, security, utilization, and solution, which we'll check out.
Benefits of Hebei Huatong's UL Cable Offerings
UL, or even Underwriters Labs, is a worldwide acknowledged organization that carries out extensive screening and accreditation of electrical cable devices and elements. Hebei Huatong's UL Cable Offerings satisfy UL requirements, guaranteeing higher quality and security.
Furthermore, these cable televisions are created along with ingenious products and innovation. They include high-temperature protection, versatility, and robustness, which makes all of them appropriate for different requests. You can easily utilize all of them for energy and command bodies, information focuses, interaction systems, and various other electrical connections.
Development at the Center
Hebei Huatong has been in the cable market for over thirty years, and it has developed credibility for development in cable manufacturing. The business has purchased research and development towards producing cable televisions that can easily endure severe atmospheres and satisfy the needs of varied markets.
Their UL Cable Offerings symbolize this development. They utilize progressed manufacturing techniques and devices to guarantee uniformity and resilience. Likewise, they go through stringent quality command treatments to guarantee that they satisfy client needs and market requirements.
Security Very initial
Security is an essential element when it concerns electrical connections. Defective flexible cable televisions can easily result in terminates, device damage, and also deadly mishaps. Hebei Huatong's UL Cable Offerings ensure security by utilizing products and styles that avoid getting too hot, brief circuits, and various other mistakes.
Furthermore, the business observes stringent security standards and policies, like the Nationwide Electrical Code (NEC), to guarantee that its cable televisions are risk-free for utilization. They carry out comprehensive screening and accreditation, and their items undergo several evaluations to guarantee that they satisfy UL requirements.
Ways to Utilize Hebei Huatong's UL Cable Offerings
Utilizing Hebei Huatong's UL Cable Offerings is simple. Very initially, determine the application you wish to utilize the cable for. After that, select the kind of cable that suits your needs. Hebei Huatong provides various kinds of UL cable televisions, like energy cable televisions, command cable televisions, and interaction cable televisions.
After selecting the kind of cable, you ought to inspect its specs, like its own dimension, voltage score, and temperature level variety. Ensure that the cable you select satisfies the demands of your application. You can easily get in touch with Hebei Huatong's customer support for support and guidance.
When you have your cable, you can easily wage the setup. Comply with the directions in the cable's datasheet or even the manufacturer's handbook. Guarantee that you utilize the appropriate devices and devices to set up the cable correctly. Likewise, ensure that you observe security standards and policies when dealing with electrical connections.
Solution You Can Easily Count On
Hebei Huatong armored cable is worth its clients, and it displays its solution quality. The business is dedicated to offering dependable and efficient solutions to its clients. They deal with technological sustain, item personalization, and after-sales solutions to guarantee client complete fulfillment.
Their technological sustain group is offered to help you with any type of concerns or even problems you have actually along with the cable items. They can easily offer guidance on selecting the appropriate cable, setting up the cable properly, and fixing any type of issues you experience.
Hebei Huatong likewise provides personalized cable services to satisfy particular client needs. You can easily demand adjustments towards the cable's dimension, protection, and conductors, to name a few functions, to suit your application demands. The business has the proficiency and resources to provide personalized cable televisions that satisfy UL requirements.
Finally, Hebei Huatong provides after-sales solutions to guarantee clients complete fulfillment. They offer guarantee and upkeep solutions to their clients. If you experience any type of problems along with the cable items, you can easily get in touch with their customer support for support.
Requests of Hebei Huatong's UL Cable Offerings
Hebei Huatong's UL Cable Offerings have lots of requests in varied markets. Right below are some instances:
1. Energy and command bodies: UL cable televisions are perfect for energy gearboxes and command requests. They include higher conductivity, resilience, and protection of residential or commercial homes, guaranteeing dependable and efficient connections.
2. Information focuses and interaction systems: UL cable televisions are likewise appropriate for information focuses and interaction systems. They offer a fast information gearbox, reduced attenuation, and sound protection, guaranteeing secure and efficient connections.
3. Electrical devices: UL cable televisions are utilized in various kinds of electrical devices, like electric motors, generators, and transformers. They guarantee a steady and risk-free procedure for the devices, reducing the danger of damages and mishaps.
Source: https://www.htcablewire.com/application/flexible-cable | david_villanuevalr_86c0b6 |
1,868,333 | Fastify plugins as building blocks for a backend Node.js API | This blog post will focus on the foundational building blocks of building backend Node.js APIs using Fastify and its recommended plugins in 2024. | 0 | 2024-05-29T02:00:41 | https://snyk.io/blog/fastify-plugins-for-backend-node-js-api/ | applicationsecurity, javascript, node | In the world of building backend Node.js APIs, Fastify stands out with its plugin ecosystem and architecture approach, offering a compelling option beyond the conventional Express framework. This highly efficient, low-overhead web framework distinguishes itself through its remarkable speed and streamlined simplicity. At the heart of Fastify's design is a robust plugin architecture that leverages the asynchronous capabilities of Node.js to the fullest, setting a new standard in performance among Node.js frameworks by emphasizing the integral role of Fastify Plugins.
Fastify's development is driven by a growing open source community, ensuring it stays relevant and up-to-date with the latest trends in web application development. If you practice backend web development in 2024, Fastify has proven to be a valuable framework for building fast, scalable, and secure web applications.
Why Fastify and its plugins make a robust backend Node.js API
-------------------------------------------------------------
When it comes to developing modern web applications, Fastify has emerged as a compelling choice among developers. This web framework, built for Node.js, offers a compelling blend of performance, flexibility, and developer-friendly features. This section will explore the benefits of using Fastify for modern application development.
### Modern ESM support
Fastify has direct support for ECMAScript modules (ESM). This is important because ESM is the official format for package JavaScript modules. With Fastify, you can natively use the import and export syntax without any transpilation step.
Here is a simple example of a Fastify server using ESM:
```
import fastify from 'fastify';
const server = fastify();
server.get('/', async (request, reply) => {
return { hello: 'world' }
});
server.listen({port: 3000}, (err, address) => {
if (err) throw err
server.log.info(`Server listening at ${address}`)
});
```
### Proper async/await promise-based route definitions
Fastify facilitates easier route handling using async/await syntax. This results in cleaner, more readable code as compared to traditional callback patterns.
Express doesn't natively support async/await in route definitions, which often leads to callback hell or the need to wrap route handlers in `try/catch` blocks to handle errors. Fastify's native support for async/await makes it easier to write and maintain asynchronous code using promises.
Here is an example showing how Fastify uses async/await in route definition:
```
server.get('/api/tasks', async (request, reply) => {
const tasks = await Tasks.findAll();
return tasks;
});
```
### High performance with fast radix route tree resolution
Fastify is designed with performance in mind. It features a fast radix route tree resolution, which is a highly efficient routing algorithm. This allows Fastify to handle many routes with minimal overhead, resulting in fast response times even under heavy load.
### A rich Fastify plugin architecture with encapsulation
Fastify has a rich plugin architecture that supports encapsulation. This means you can easily break down your application into isolated components, each with its own set of routes, plugins, and decorators. This promotes better code organization and reduces the risk of name collisions.
Here's an example of a Fastify plugin that decorates the route handler with a utility function:
```
import fp from 'fastify-plugin';
export default fp(async function (fastify, opts) {
fastify.decorate('utility', () => 'This is a utility function');
});
```
You'd use this plugin as follows:
```
// import and get a fastify server instance,
// and then:
server.register(import('./utility-plugin.js'));
server.get('/', async (request, reply) => {
return server.utility();
});
```
### Lightweight dependency injection
Fastify's plugin system also acts as a lightweight dependency injection (DI) system. This allows for easy sharing of common utilities and services across your application without resorting to singletons or global variables.
In the following example, a database connection is shared across different parts of the application:
```
fastify.register(async function (fastify, opts) {
const db = await someDbConnectionLibrary(opts.connectionString);
fastify.decorate('db', db);
});
```
A simple backend Node.js API with Fastify
-----------------------------------------
This blog post will focus on the foundational building blocks of building backend Node.js APIs using Fastify and its recommended plugins in 2024. We will dive deep into the essential components of a Fastify application, from routing and middleware to validation and serialization.
Furthermore, given the importance of cybersecurity in today's digital world, we will briefly explore aspects related to web security and how to use Fastify plugins to handle them, a crucial aspect often overlooked in the haste of application development.
To begin, ensure that you have the latest Node.js LTS version installed on your system (at the date of writing, it is v20.11.1). Then, initialize a new Node.js project and install Fastify using npm, as shown below:
```
$ mkdir fastify-app && cd fastify-app
$ npm init -y
$ npm install --save fastify
```
Edit the `package.json` file to add a top level `type: module` key definition to enable ESM support:
```
{
"type": "module",
}
```
We can then continue with the basic structure of a Fastify application in a `server.js` file in the root directory of the project:
```
// Import Fastify using ESM syntax
import Fastify from "fastify";
const fastify = Fastify({ logger: true });
// Defining a route
fastify.get("/", async (request, reply) => {
return { hello: "world" };
});
async function startServer() {
try {
// Start the server
const address = await fastify.listen({
port: 3000,
host: "localhost",
});
// Log the server start information using the address returned by Fastify
// Fastify will already log the server start information by default
// But here is an example of how you can log the server start information
// fastify.log.info(`Server starting up at ${address}`);
} catch (err) {
fastify.log.error(err);
process.exit(1);
}
}
startServer();
```
### Encapsulating the API route in a Fastify plugin
Fastify promotes the use of plugins to organize your code and enable encapsulation. This allows you to keep related code bundled together and helps avoid conflicts in different parts of your application.
Let's refactor our "Hello World" route into a Fastify plugin:
```
const fastify = require('fastify')({ logger: true });
const helloRoute = async (fastify, options) => {
fastify.get('/', async (request, reply) => {
return { hello: 'world' };
});
};
fastify.register(helloRoute);
const start = async () => {
try {
await fastify.listen(3000);
fastify.log.info(`server listening on ${fastify.server.address().port}`);
} catch (err) {
fastify.log.error(err);
process.exit(1);
}
};
start();
```
### Using route request and response schema
Fastify provides a way to validate incoming requests and structure outgoing responses using JSON schema. This helps to ensure the data integrity of your application and simplifies the process of creating documentation.
Here's how you can define a request and response schema for the "Hello World" route:
```
const helloRoute = async (fastify, options) => {
fastify.route({
method: 'GET',
url: '/',
schema: {
response: {
200: {
type: 'object',
properties: {
hello: { type: 'string' },
},
},
},
},
handler: async (request, reply) => {
return { hello: 'world' };
},
});
};
fastify.register(helloRoute);
```
Now, Fastify will automatically validate the response of the "Hello World" route against the provided schema. This helps catch potential bugs and ensures your application behaves as expected.
Fastify plugins as building blocks of Fastify applications
----------------------------------------------------------
In this section, we will take a look at four key Fastify plugins: `@fastify/pino`, `@fastify/cors`, `@fastify/env`, and `@fastify/swagger` along with `@fastify/swagger-ui`. These plugins are helpful in forming the backbone of any Fastify application when building a backend Node.js API.
### The Pino logger for Fastify
Pino is an exceptionally high-performance logger for Node.js, with its own plugins that extend it to integrate with other logging systems such as Sentry and others.
You can take advantage of the fact that Fastify uses Pino as its default logger. You're already utilizing Pino under the hood when you instantiate Fastify with `{ logger: true }`. However, you can pass a configuration object to the logger property if you want more control over the logging level or other Pino-specific configurations.
During development, you might want a friendlier and more colorful log output, so we can use the `pino-pretty` package to achieve this. First, install both `pino` and `pino-pretty`:
```
npm install --save pino pino-pretty
```
And configure `pino-pretty` as follows:
```
import pino from "pino";
const logger = pino({
transport: {
target: "pino-pretty",
options: {
colorize: true,
},
},
});
logger.info("Hello from pino-pretty");
const fastify = Fastify({
logger: logger,
});
```
In the above, we instantiate a logger using pino and configure it to use `pino-pretty` as the transport target, providing it with the `colorize` option to enable colorful log output. We then pass our custom `logger` variable to Fastify's `logger` option.
This transforms the log output into a more human-readable format, making it easier to read and understand:
```
[12:13:43.499] INFO (95477): hello from pino-pretty
[12:13:43.517] INFO (95477): Server listening at http://[::1]:3000
[12:13:43.518] INFO (95477): Server listening at http://127.0.0.1:3000
```
The benefits of using Pino in Fastify include:
* Faster logging: Pino's primary goal is to be the quickest logger for Node.js.
* Versatile logger: It supports different log levels and can format logs as JSON.
### The Fastify plugin @fastify/cors
The` @fastify/cors` plugin provides a simple way to use CORS (cross-origin resource sharing) in your Fastify application.
Benefits:
* Secure: Helps to manage the flow of data between different origins.
* Customizable: Allows you to define a custom function to set CORS options.
Here's a simple example showing how to add and use the `@fastify/cors` plugin:
```
// after creating the fastify instance
// let's register the fastify cors plugin:
fastify.register(require('@fastify/cors'), {
origin: '*',
methods: ['GET','POST', 'PUT', 'DELETE']
})
```
We can then test whether the CORS configuration is working by making a cURL request to the Fastify server:
```
curl -i http://localhost:3000
```
The response should include the `Access-Control-Allow-Origin` header, indicating that the CORS configuration is working as expected:
```
HTTP/1.1 200 OK
access-control-allow-origin: *
content-type: application/json; charset=utf-8
content-length: 17
Date: Sun, 18 Feb 2024 10:20:15 GMT
Connection: keep-alive
Keep-Alive: timeout=72
```
### The Fastify plugin @fastify/env
It's common for Node.js developers to use environment variables to configure their applications and even more so to utilize the `.env` file to manage these variables.
This is where the `@fastify/env` Fastify plugin comes in handy. While you can use `dotenv` or Node.js built-in `--env-file` to load configuration, this Fastify plugin allows you to interact with the configuration of these environment variables directly from your Fastify application while also providing configuration validation and type conversion.
Here's a simple example showing how to add and use the `@fastify/env` plugin. Start by installing the plugin and creating a simple `.env` file:
```
npm install --save @fastify/env
echo "PORT=3001" > .env
```
And then update the `server.js` code to register this new Fastify plugin:
```
fastify.register(import('@fastify/env'), {
dotenv: true,
schema: {
type: 'object',
required: [ 'PORT' ],
properties: {
PORT: {
type: 'string',
default: 3000
}
}
}
})
```
Registering the `@fastify/env` Fastify plugin provides access to the configuration defined in the `.env` file via the `fastify.config` object. However, we can't just use it directly. We need to introduce a new concept related to Fastify plugin architecture.
With Fastify's asynchronous plugin architecture, it is required to wait for Fastify to initialize all the plugins before they are actually applied. Doing so ensures that the plugins are properly registered and ready to be used, and if you had skipped this step, you would have encountered an error when trying to access the `fastify.config` object.
So our new startServer() function needs to be updated as follows:
```
try {
// wait for all plugins to run
await fastify.ready();
// Start the server
const address = await fastify.listen({
// now we can access the fastify.config.PORT configuration
port: fastify.config.PORT,
host: "localhost",
});
```
Benefits of using the `@fastify/env` plugin:
* Environment variable validation: Ensures required environment variables are present.
* Type conversion: Converts environment variables to the required types.
* Light-weight dependency injection: Allows for easy sharing of configuration across your application wherever you can access the `fastify` application instance.
### Document backend Node.js APIs with @fastify/swagger and @fastify/swagger-ui Fastify plugins
The `@fastify/swagger` plugin helps generate and serve a swagger documentation page for your Fastify application. `@fastify/swagger-ui` is a plugin that provides a built-in UI for your swagger documentation that can be accessed via a web browser and the Fastify application itself serves this Swagger UI web page.
As before, we'll begin by adding these plugins to our Fastify application:
```
npm install --save @fastify/swagger @fastify/swagger-ui
```
Then, we continue to register these two plugins in our `server.js` file:
```
fastify.register(import('@fastify/swagger'), {
routePrefix: '/documentation',
swagger: {
info: {
title: 'Test swagger',
description: 'testing the fastify swagger api',
version: '0.1.0'
},
host: 'localhost',
schemes: ['http'],
consumes: ['application/json'],
produces: ['application/json']
},
exposeRoute: true
})
fastify.register(import('@fastify/swagger-ui'))
```
Restart the Fastify server and open this URL `http://localhost:3001/documentation` in your web browser to see the generated Swagger UI documentation page. And just like that, you have a fully functional Swagger documentation page for your Fastify application.
A note regarding security concerns — in a production environment, you should consider securing the Swagger UI documentation page with authentication and authorization and avoid using your production Node.js servers to serve the Swagger UI documentation page.
Benefits:
* Easy API documentation: Automatically generates API documentation.
* Customizable: Allows customization of the documentation page.
Bringing it all together
------------------------
As we've explored, Fastify's vibrant ecosystem offers a variety of plugins that can significantly enhance your backend Node.js API development process. From improving logging capabilities with `pino` and `pino-pretty` to ensuring CORS browser security through `@fastify/cors`, managing environment variables with `@fastify/env`, and documenting your API with `@fastify/swagger` and `@fastify/swagger-ui, these tools are designed to streamline your workflow, enhance performance, and elevate the quality of your applications.
Our learnings about Fastify plugins can be summarized as follows:
**Embracing modular development**: Fastify's plugin architecture promotes modular development and encourages a clean and maintainable codebase. By integrating these plugins, developers can focus on writing business logic rather than boilerplate code, enabling rapid development without compromising performance or scalability.
**Boosting productivity and performance**: Each plugin, with its specific focus, addresses common web development challenges, allowing you to build robust, efficient, and secure APIs. The simplicity of their integration with Fastify, coupled with the benefits they bring, such as enhanced logging, cross-origin resource sharing, environment configuration, and API documentation, directly contributes to increased developer productivity and application performance.
**Encouraging further exploration**: While we've highlighted a few essential plugins, the Fastify ecosystem is rich with many other plugins addressing various needs, from authentication to database integration, rate limiting, and more. We encourage developers to explore the Fastify plugins page and experiment with these tools to discover how they can further optimize and enhance their API development process.
You are welcome to follow the [complete source code](https://github.com/snyk-snippets/fastify-plugins-for-backend-nodejs-api-development.) for all of the above examples of a backend Node.js API with the Fastify plugins we discussed.
| snyk_sec |
1,868,332 | A protoc compiler plugin that generates useful extension code for Kotlin/JVM | Using protobuf-java from Kotlin can be inconvenient, so I created my own protoc compiler plugin to address this | 0 | 2024-05-29T01:59:04 | https://dev.to/behase/a-protoc-compiler-plugin-that-generates-useful-extension-code-for-kotlinjvm-3j0j | kotlin, protobuf | ---
title: A protoc compiler plugin that generates useful extension code for Kotlin/JVM
published: true
description: Using protobuf-java from Kotlin can be inconvenient, so I created my own protoc compiler plugin to address this
tags: kotlin, protobuf
---
## TL;DR
https://github.com/be-hase/protoc-gen-kotlin-ext
- Generate `*OrNull` extension properties for optional field
- In [protoc-gen-kotlin](https://protobuf.dev/getting-started/kotlintutorial/), this extension properties is only
provided for message types. We provide it for scalar types as well.
- https://github.com/protocolbuffers/protobuf/issues/12935
- Generate factory functions that resemble data class constructors
- We do not generate our own code, so we can take advantage of the official ecosystem
- It only generates additional useful code.
### Example
Let's assume we have the following proto file.
```protobuf
message Person {
string first_name = 1;
string last_name = 2;
optional string middle_name = 3;
Gender gender = 4;
optional string nickname = 5;
Address primary_address = 6;
}
enum Gender {
GENDER_UNSPECIFIED = 0;
MALE = 1;
FEMALE = 2;
OTHERS = 3;
}
message Address {
string country = 1;
string state = 2;
string city = 3;
string address_line_1 = 4;
optional string address_line_2 = 5;
}
```
Using the generated code, you can write the following:
```kotlin
fun main() {
// You can use factory functions that resemble data class constructors
val person = Person(
firstName = "Ryosuke",
lastName = "Hasebe",
middleName = null, // Optional fields become nullable
gender = Gender.MALE,
nickname = null, // Optional fields become nullable
primaryAddress = Address(
country = "JP",
state = "Tokyo",
city = "blah blah blah",
addressLine1 = "blah blah blah",
addressLine2 = null, // Optional fields become nullable
),
)
// You can use `*OrNull` extension properties for optional field
println(person.middleNameOrNull)
println(person.nicknameOrNull)
println(person.primaryAddress.addressLine2OrNull)
println(person.primaryAddressOrNull)
}
```
## Motivation
### Challenges with Pptional Field (Field Presence)
From protobuf 3.12, the long-awaited optional field (Field Presence) has been reintroduced. This allows the
representation of null (as in java/kotlin).
```protobuf
message Sample {
optional string hoge = 2;
optional int32 bar = 3;
}
```
However, this optional feature is somewhat tricky. When you retrieve a value with a getter, it returns the default
value (e.g., `""` for strings, `0` for int32). This means that for strings, you cannot distinguish whether the value has
been explicitly set to `""` or not set at all. Instead, optional fields provide a `has*` method to check if the value
has been set, which you should use to determine if it is `null`.
If you are unaware of this specification, you might mistakenly treat an `""` or `0` as a valid value, potentially
causing bugs.
```kotlin
Sample.newBuilder().build().also {
println("[1] hoge: ${it.hoge}")
println("[1] hasHoge: ${it.hasHoge()}")
println("[1] bar: ${it.bar}")
println("[1] hasBar: ${it.hasBar()}")
}
Sample.newBuilder().setHoge("hoge").setBar(1).build().also {
println("[2] hoge: ${it.hoge}")
println("[2] hasHoge: ${it.hasHoge()}")
println("[2] bar: ${it.bar}")
println("[2] hasBar: ${it.hasBar()}")
}
```
```
[1] hoge:
[1] hasHoge: false
[1] bar: 0
[1] hasBar: false
[2] hoge: hoge
[2] hasHoge: true
[2] bar: 1
[2] hasBar: true
```
Even knowing this specification correctly would result in a large amount of boilerplate code, such as the following:
```kotlin
// 😭
val hoge = if (sample.hasHoge()) {
sample.hoge
} else {
null
}
```
To address this for Kotlin, we will auto-generate `*OrNull` extension properties. When implementing,
seeing `*OrNull`
through autocompletion should help avoid some issues. Additionally, this allows the use of the Elvis operator, resulting
in smoother code.
```kotlin
val BlahBlah.hogeOrNull: kotlin.String?
get() = if (hasHoge()) hoge else null
```
Interestingly, for message types, using `protoc-gen-kotlin` already generates similar extension properties.
https://github.com/protocolbuffers/protobuf/blob/b30f3de12f946b6d610c21bc605726bf56ea889f/src/google/protobuf/compiler/java/message.cc#L1352C33-L1370
I have raised an [issue](https://github.com/protocolbuffers/protobuf/issues/12935) requesting the addition of optional
scalar types, but it is not planned to be supported by `protoc-gen-kotlin`.
### Challenges with Java Builder
Protobuf uses builders to set values. Since this code is written in Java, there is no non-null/nullable type checking.
When used from Kotlin, it is often misunderstood that it is okay to set null for optional fields, which results in
passing null and encountering NPEs (NullPointerExceptions).
```kotlin
Sample.newBuilder()
.setHoge(null) // This code raises NPE 😭
.setBar(1)
.build();
```
When using protoc-gen-kotlin, the following DSL is generated for Kotlin. This is beneficial because it includes
non-null/nullable type checking. Great!
```kotlin
sample {
hoge = null // This code results in a compile error 😀
bar = 1
}
```
However, in Kotlin, it feels more natural to write using constructors with named arguments, like data classes.
Additionally, just like the builder, the DSL does not result in a compile error when a field is added later. This can
lead to cases where values are forgotten to be set. However, opinions may differ on whether this is seen as a
disadvantage or an advantage.
If it is code provided by libraries or similar, it is better not to do it as it may break
compatibility.
If it is code used within your own application, I think it is convenient. If you prioritize a more robust programming
style, it is preferable to have a compile error indicating that a value has been forgotten.
Therefore, we will auto-generate the following factory function. Note that this `Sample(...)` is not a constructor but a
function.
It can be written similarly to a data class, and when a field is added later, it will result in a compile error,
indicating that a value might be forgotten to be set. Since it is defined in Kotlin, nullable type checking is also
enabled.
```kotlin
// similar to a data class 😀
Sample(
hoge = "hoge",
bar = 1
)
// Of course, when it is optional, it becomes a nullable type
Sample(
hoge = null, // This code results in a compile error 😀
bar = 1
)
```
```kotlin
public fun Sample(hoge: String?, bar: Int?): Sample {
val _builder = Sample.newBuilder().apply {
hoge?.let { setHoge(it) }
bar?.let { setBar(it) }
}
return _builder.build()
}
```
We considered adding factory functions with default arguments, but we decided not to create them at this time. If there
are default arguments, adding a field later would not result in a compile error.
If you want to use default values, you can use java builder or kotlin DSL.
## How to use?
### Gradle
When used with [protoc-gen-kotlin](https://protobuf.dev/getting-started/kotlintutorial/):
```kotlin
protobuf {
protoc {
artifact = "com.google.protobuf:protoc:<version>"
}
plugins {
id("kotlin-ext") {
artifact = "dev.hsbrysk:protoc-gen-kotlin-ext:<version>:jdk8@jar"
}
}
generateProtoTasks {
all().forEach { task ->
task.plugins {
id("kotlin-ext") {
outputSubDir = "kotlin"
}
}
task.builtins {
id("kotlin")
}
}
}
}
```
When used standalone:
```kotlin
protobuf {
protoc {
artifact = "com.google.protobuf:protoc:<version>"
}
plugins {
id("kotlin-ext") {
artifact = "dev.hsbrysk:protoc-gen-kotlin-ext:<version>:jdk8@jar"
}
}
generateProtoTasks {
all().forEach { task ->
task.plugins {
id("kotlin-ext") {
outputSubDir = "kotlin"
// This option is explained later in the document
option("messageOrNullGetter+")
}
}
}
}
}
```
### Maven or `Manual protoc Usage`
Since the plugin is created using the same mechanism as protoc-gen-grpc-kotlin, please refer to this document.
- [Maven](https://github.com/grpc/grpc-kotlin/blob/master/compiler/README.md#maven)
- [Manual protoc Usage](https://github.com/grpc/grpc-kotlin/blob/master/compiler/README.md#manual-protoc-usage)
## Advanced
### Compile Options
Perhaps you only want the `*OrNull` extension property and do not need the factory function. (and vice versa).
This can be achieved by setting the compile options.
```kotlin
// Here, we will use Gradle as an example.
protobuf {
// ...
generateProtoTasks {
all().forEach { task ->
task.plugins {
id("kotlin-ext") {
// ...
// HERE
option("messageOrNullGetter+")
}
}
}
}
}
```
The following options are available. Appending `+` to the end of an option enables it, while appending `-` disables it.
- `factory`
- Whether to generate a factory (default: on)
- `orNullGetter`
- Whether to generate `orNull` extension functions for optional scalar fields (default: on)
- `messageOrNullGetter`
- Whether to generate `orNull` extension functions for optional message fields (default: off)
- Not needed when using protobuf-kotlin.
When specifying multiple options, please separate them with commas. For
example, `factory-, orNullGetter+, messageOrNullGetter+` | behase |
1,868,331 | Day 1: Getting Started with JavaScript | Introduction Welcome to the first day of your JavaScript journey! JavaScript is a... | 0 | 2024-05-29T01:58:28 | https://dev.to/dipakahirav/day-1-getting-started-with-javascript-16p3 | javascript, beginners, html, css | #### Introduction
Welcome to the first day of your JavaScript journey! JavaScript is a powerful, versatile language used for web development, and it's an essential skill for any aspiring web developer. Today, we will set up your development environment and write your first lines of JavaScript code.
#### Setting Up Your Environment
**1. Install Visual Studio Code**
Visual Studio Code (VS Code) is a popular, free code editor that supports JavaScript and many other languages. Follow these steps to install it:
- Go to the [VS Code download page](https://code.visualstudio.com/download).
- Download and install the appropriate version for your operating system (Windows, macOS, or Linux).
- Launch VS Code after installation.
**2. Setting Up Your Browser for JavaScript**
Modern web browsers like Google Chrome come with built-in developer tools that make it easy to write and test JavaScript. We will use Chrome for this tutorial:
- Download and install [Google Chrome](https://www.google.com/chrome/) if you don't already have it.
- Open Chrome and press `Ctrl + Shift + J` (Windows/Linux) or `Cmd + Option + J` (macOS) to open the JavaScript console.
#### Writing Your First JavaScript Code
Now that we have our tools ready, let's write our first JavaScript program. We'll start with the classic "Hello, World!" example.
**1. Using the Browser Console**
- Open the Chrome Developer Tools console.
- Type the following code into the console and press Enter:
```javascript
console.log("Hello, World!");
```
- You should see "Hello, World!" printed in the console.
**2. Creating a JavaScript File**
- Open VS Code and create a new file named `index.html`.
- Add the following HTML code to the file:
```html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>JavaScript Day 1</title>
</head>
<body>
<h1>Welcome to JavaScript!</h1>
<script src="app.js"></script>
</body>
</html>
```
- Save the file and create another file in the same directory named `app.js`.
- Add the following JavaScript code to `app.js`:
```javascript
console.log("Hello, World from app.js!");
```
- Save the file.
**3. Running Your Code**
- Open `index.html` in your browser.
- Open the Chrome Developer Tools console (`Ctrl + Shift + J` or `Cmd + Option + J`).
- You should see "Hello, World from app.js!" printed in the console.
#### Understanding the Basics
**1. What is JavaScript?**
JavaScript is a programming language that allows you to implement complex features on web pages. It enables interactive web pages and is an essential part of web applications.
**2. How JavaScript Works**
JavaScript runs in the browser and interacts with HTML and CSS to create dynamic web pages. The browser's JavaScript engine executes the code, making it possible to manipulate the content and behavior of web pages.
**3. JavaScript Syntax**
JavaScript code consists of statements that are executed by the browser. Here are a few basic concepts:
- **Statements**: Instructions that perform actions. Each statement ends with a semicolon (`;`).
- **Comments**: Used to add explanatory notes. Single-line comments start with `//`, and multi-line comments are enclosed in `/* */`.
- **Variables**: Used to store data values. Variables are declared using `var`, `let`, or `const`.
**Example:**
```javascript
// This is a single-line comment
let message = "Hello, JavaScript!";
console.log(message); // Output: Hello, JavaScript!
```
#### Summary
Today, we set up our development environment and wrote our first JavaScript code. We've learned how to use the browser console and create a basic HTML file with an external JavaScript file. Understanding these fundamentals is crucial as we continue our journey into JavaScript.
Stay tuned for Day 2, where we'll dive into variables and data types!
#### Resources
- [Visual Studio Code](https://code.visualstudio.com/)
- [Google Chrome](https://www.google.com/chrome/)
- [MDN Web Docs: JavaScript Basics](https://developer.mozilla.org/en-US/docs/Learn/Getting_started_with_the_web/JavaScript_basics)
Happy coding! Let's learn and grow together!
*Follow me for more tutorials and tips on web development. Feel free to leave comments or questions below!*
#### Follow and Subscribe:
- **Website**: [Dipak Ahirav] (https://www.dipakahirav.com)
- **Email**: dipaksahirav@gmail.com
- **Instagram**: [devdivewithdipak](https://www.instagram.com/devdivewithdipak)
- **YouTube**: [devDive with Dipak](https://www.youtube.com/@DevDivewithDipak)
- **LinkedIn**: [Dipak Ahirav](https://www.linkedin.com/in/dipak-ahirav-606bba128) | dipakahirav |
1,868,328 | Mastering Code Quality: Applying SOLID Principles in a Library Checkout System | The SOLID principles are a group of five design rules in object-oriented programming and software... | 0 | 2024-05-29T01:46:17 | https://dev.to/nichetti/mastering-code-quality-applying-solid-principles-in-a-library-checkout-system-kp6 | solidprinciples, tutorial, java |
The **SOLID** principles are a group of five design rules in object-oriented programming and software engineering. These principles give you guidance to write code that's easier to maintain, change, and sturdy. In this blog post, we'll explore each of these SOLID principles, explaining what they mean and how they help you write better software.
---
## Single Responsibility Principle (SRP)
• The Single Responsibility Principle states that a class should have only one reason to change. In other words, it should have a single responsibility. When a class has more than one responsibility, it becomes tightly coupled, making it challenging to make changes without affecting other parts of the code.
• To apply SRP, break down your code into smaller, focused classes or modules, each responsible for a single task. This not only makes your code more maintainable but also enhances its reusability.
• For instance, suppose we have a `LibraryCheckout `class responsible for both checking out books and calculating late fees:
```java
class LibraryCheckout {
public void checkOutBook(Book book) {
// Process book checkout
}
public double calculateLateFee(Book book) {
// Calculate late fee
return lateFee;
}
}
```
• To adhere to SRP, you can separate the responsibilities:
```java
class BookCheckout {
public void checkOutBook(Book book) {
// Process book checkout
}
}
class LateFeeCalculator {
public double calculateLateFee(Book book) {
// Calculate late fee
return lateFee;
}
}
```
---
## Open/Closed Principle (OCP)
• The Open/Closed Principle suggests that software entities should be open for extension but closed for modification. This means you should be able to add new features or behaviors without altering existing code.
• To uphold OCP, employ inheritance, interfaces, and abstractions to enable easy extension. This allows new functionality to be added through new classes or interfaces, without necessitating changes to existing code.
• For example, if we have a `LibraryCheckout `class for checking out books, and we want to extend it to handle video rentals, we can create a new class without modifying the existing one:
```java
class VideoRentalCheckout {
public void checkOutVideo(Video video) {
// Process video checkout
}
}
```
---
## Liskov Substitution Principle (LSP)
• The Liskov Substitution Principle focuses on the relationship between a base class and its derived classes. It states that objects of derived classes should be able to replace objects of the base class without affecting the program's correctness.
• To illustrate LSP, let's consider a LibraryItem base class and its derived classes Book and DVD:
```java
class LibraryItem {
public void checkOut() {
// Check out the library item
}
}
class Book extends LibraryItem {
private String isbn;
public void setIsbn(String isbn) {
this.isbn = isbn;
}
@Override
public void checkOut() {
// Check out the book
}
}
class DVD extends LibraryItem {
private String title;
public void setTitle(String title) {
this.title = title;
}
@Override
public void checkOut() {
// Check out the DVD
}
}
```
• We should be able to substitute a DVD object wherever a LibraryItem object is expected without affecting the program's behavior:
```java
public class Library {
public void processCheckout(LibraryItem item) {
item.checkOut();
}
}
public class Main {
public static void main(String[] args) {
Library library = new Library();
Book book = new Book();
book.setIsbn("978-3-16-148410-0");
library.processCheckout(book); // Process checkout for a book
DVD dvd = new DVD();
dvd.setTitle("The Matrix");
library.processCheckout(dvd); // Process checkout for a DVD
}
}
```
---
## Interface Segregation Principle (ISP)
• The Interface Segregation Principle advocates creating specific, client-focused interfaces rather than large, monolithic ones. It states that no client should be forced to depend on methods it does not use.
• To follow ISP, design interfaces tailored to the specific needs of clients. This reduces the need for clients to implement unnecessary methods, resulting in more cohesive and maintainable code.
• For example, instead of a broad `LibraryService `interface:
```java
interface LibraryService {
void checkOutBook();
void returnBook();
}
```
• Create specific interfaces for each type of service:
```java
interface BookCheckoutService {
void checkOutBook();
}
interface BookReturnService {
void returnBook();
}
```
---
## Dependency Inversion Principle (DIP)
• The Dependency Inversion Principle promotes decoupling high-level modules from low-level modules by suggesting that both should depend on abstractions rather than concrete implementations. This decoupling makes it easier to change low-level modules without impacting high-level ones.
• To implement DIP, use dependency injection, inversion of control containers, and abstractions to separate high-level and low-level components. This increases flexibility, eases testing, and reduces coupling.
• For example, instead of having a `LibraryService `directly depend on specific book providers:
```java
class LibraryService {
private BookProvider provider;
public LibraryService(BookProvider provider) {
this.provider = provider;
}
public void checkOutBook() {
// Use the provider to check out a book
}
}
```
• Depend on abstractions:
```java
interface BookProvider {
void checkOutBook();
}
class LibraryBookProvider implements BookProvider {
public void checkOutBook() {
// Checkout a book from the library
}
}
class OnlineBookProvider implements BookProvider {
public void checkOutBook() {
// Checkout a book online
}
}
class LibraryService {
private BookProvider provider;
public LibraryService(BookProvider provider) {
this.provider = provider;
}
public void checkOutBook() {
provider.checkOutBook();
}
}
```
• These examples illustrate how applying the SOLID principles can make a library checkout system more modular and extensible.
---
## Conclusion
• The SOLID principles offer a robust framework for writing maintainable and extensible code. By adhering to these principles, you can develop software that is more reliable, easier to understand, and less prone to errors. While mastering these principles may require practice, the benefits in terms of code quality and maintainability are significant. Keep the SOLID principles in mind for your next software project or when refactoring existing code to create better, more adaptable software.
| nichetti |
1,868,326 | Variables | Variables in JavaScript are containers for storing data values. They are declared using the var,... | 0 | 2024-05-29T01:43:08 | https://dev.to/__khojiakbar__/variables-1eje | javascript, variables, var, let |
- Variables in JavaScript are containers for storing data values.
- They are declared using the **`var`**, **`let`**, or **`const`** keywords.
- Variables declared with **`var`** have function scope or global scope, while those declared with **`let`** or **`const`** have block scope.
- It's recommended to use **`let`** or **`const`** for variable declarations to avoid issues related to scope and hoisting.
```
// Variable declaration with var (function-scoped)
var firstName = "John";
console.log(firstName); // Output: John
// Variable declaration with let (block-scoped)
let lastName = "Doe";
console.log(lastName); // Output: Doe
// Variable declaration with const (block-scoped constant)
const age = 30;
console.log(age); // Output: 30
```
| __khojiakbar__ |
1,868,320 | My Making of AI Speaking Museum | Experience How AI is Revolutionizing the Business World with Interactive, Voice-Activated... | 0 | 2024-05-29T01:22:42 | https://dev.to/exploredataaiml/my-making-of-ai-speaking-museum-4lhp | llm, rag, ai, machinelearning | Experience How AI is Revolutionizing the Business World with Interactive, Voice-Activated Learning
[Full Article] (https://medium.com/@learn-simplified/my-making-of-ai-speaking-museum-25edf9f0ef1e)
[1 of final Result](https://youtu.be/J-6kKQ6W1D0?si=KHFITAO6ky7tBswk)
● What Are We Building Today? -
This Project is result of visiting a museum with my son where a pre-recorded message about geological origins couldn't engage with his follow-up questions. This sparked the idea of creating a virtual museum with AI dinosaur exhibits that could understand context and provide personalized responses like a real guide.
● Why Read This Article? -
While an AI dinosaur museum may seem niche, the innovative approach of blending technologies has widespread potential across industries to revolutionize products, services, and user experiences through contextualized voice AI and natural language interaction.
● The Goal -
The goal was to build immersive, voice-enabled dinosaur environments that bring prehistoric creatures to life through natural conversation, allowing visitors to ask follow-up queries and explore tangential topics dynamically.
● How to Design? -
The system leverages a multi-model approach: user input is processed by a language model (Llama3 on Ollama), potentially referencing a dataset, then the output is transformed into natural speech by ElevenLabs AI and delivered through a user interface, creating a seamless conversational experience.
● Let's Get Cooking! -
The project has two critical flows:
User Interaction (Streamlit app) and REST API Server (Flask). -
The Streamlit app showcases dinosaurs, allows selecting one and entering queries, sends requests to the server, and displays responses. - The Flask server handles requests, fetches relevant dinosaur content, queries the language model, and returns responses (generating audio with ElevenLabs).
● Setup Instructions -
Detailed step-by-step instructions are provided for setting up a virtual environment, installing dependencies (Streamlit, Ollama, LLaMA-3), running the API server and Streamlit app, and testing the application.
This article explains my motivation and vision for creating an AI-powered virtual museum with voice interaction capabilities. It outlines the multi-model approach, system design, and implementation details, emphasizing the potential for applying similar technologies to various industries. Clear setup instructions are provided for readers to recreate the project.
| exploredataaiml |
1,868,325 | The Art of Hospitality: Selecting the Perfect Linens with After-Sales Support | The Art of Hospitality: Selecting the Perfect Linens with Support Hospitality an essential right... | 0 | 2024-05-29T01:40:59 | https://dev.to/david_villanuevalr_86c0b6/the-art-of-hospitality-selecting-the-perfect-linens-with-after-sales-support-4p3a | linens | The Art of Hospitality: Selecting the Perfect Linens with Support
Hospitality an essential right part of our life. We all love to host and enjoy a right time good our closest friends and family. However, it's not just about the food and beverages, it's about the experience we create. And no experience complete without perfect linens.
Advantages of Linens
When it comes to the hospitality sector, perfect linens are essential for several reasons. They are not just another piece of cloth, they contribute to your guest's overall experience. Hotel Pillow Linens the thing first your guest encounters, and the right choice can help create a atmosphere welcoming. They add a touch of elegance and make the guests feel taken and pampered care of. A quality good can also give a sense of luxury, which a sure-shot way to impress your guests.
Innovation in Linens
Over the years full textile companies have innovated in the development of new fabrics and textures. They have experimented with different materials, from cotton, polyester, and silk. These materials offer different benefits. For example, cotton linens soft, comfortable, and breathable, making them perfect for everyday use. In contrast, silk offers a luxurious feel but requires care special. The innovation in the linen market has enabled the incorporation of different textures and patterns add to the aesthetics of the setting overall.
Safety Concerns
When linens selecting your hospitality business, safety is should be a primary concern. The linens should be made of non-toxic materials do not pose any ongoing health hazards to your guests. Some linens might have a high level, which can be particularly harmful to children. Quality assurance protocols require vendors to disclose the materials used in the production of linens, making it easier to choose linens safe.
How to Use Linens
Using soft pillow hotel linens not rocket science, but there are some best practices one should follow. First, it's essential to choose the right size. Oversized linens tend to bunch up, making it hard for your guests to use them. Secondly, make sure to match your color schemes to the ambiance overall of venue. A well-coordinated theme more appealing to the guests and adds value aesthetic. Finally, always ensure the linens ironed and clean. Dirty or linens crumpled away from the experience overall you're trying to create.
Services and Support
To make the use best of linens, you need to have the services right support system. A vendor that's good quality provide and support services to ensure you get the best linens for your hospitality business. Services like delivery, pick-up, and requests special be available. As a business continuing, you can rest easy, knowing the vendor manages stocking and laundering of the linens. Support services like online portals to track your orders and customer support hotlines contribute to the convenience overall of the vendor's services.
Quality of Linens
The linen's quality is a factor selecting critical perfect Hotel Bath linen. The quality of the material determines the resilience and durability of the linens. Good quality linen can last for years, while a linen low-quality only last a events few. The thread count of the linen a quality good, as it reflects the true number of threads woven into the fabric. Higher thread count linens are denser, softer, and more durable, making them ideal for hospitality businesses.
Applications
There a range wide of linens in the hospitality sector. Each of these linens plays a role significant creating the ideal atmosphere from tablecloths, napkins, table runners, placemats, and chair covers. The perfect linens can help create the desired ambiance for your guests whether you're hosting a family dinner or a event corporate selecting.
Source: https://www.youmianhotellinen.com/Application/soft-pillow-hotel | david_villanuevalr_86c0b6 |
1,868,324 | HOW TO RECOVER STOLEN BITCOIN WITH THE HELP OF DIGITAL WEB RECOVERY | In investment scams, where trust is shattered and fortunes hang in the balance, finding a guiding... | 0 | 2024-05-29T01:34:35 | https://dev.to/christy_baker_0622220e4a5/how-to-recover-stolen-bitcoin-with-the-help-of-digital-web-recovery-22ni | In investment scams, where trust is shattered and fortunes hang in the balance, finding a guiding light amidst the darkness can feel like an impossible feat. I found myself plunged into this abyss of despair when I fell victim to a cunning scheme that cost me nearly half a million dollars. The weight of this loss bore down on me like a crushing burden, threatening to drown me in a sea of frustration and stress. However, in my hour of need, fate intervened in the form of Digital Web Recovery. Introduced to me by influential acquaintances who recognized my plight, this organization emerged as a beacon of hope in the murky depths of deception. With their specialization in crypto recovery, Digital Web Recovery stood poised to navigate the complexities of my situation and lead me toward redemption. I made contact with them, I was enveloped in a cocoon of support and reassurance. Their team of seasoned professionals radiated confidence and competence, instilling within me a newfound sense of hope and optimism. With each interaction, they reaffirmed their commitment to helping individuals and businesses reclaim their lost funds from investment scams. True to their word, Digital Web Recovery wasted no time in springing into action. With the precision of a master craftsman, they meticulously unraveled the tangled web of deceit that ensnared me, leaving no stone unturned in their quest for justice. Their unwavering determination and relentless pursuit of truth were nothing short of awe-inspiring, serving as a testament to their unparalleled expertise in the field. And then, like a phoenix rising from the ashes, the moment of triumph arrived. Through their tireless efforts, Digital Web Recovery successfully tracked down the perpetrators of the scam and secured the complete amount of my lost funds. It was a victory not just for me, but for all those who had been ensnared in the web of deceit. The significance of this redemption cannot be overstated. In the face of overwhelming adversity, Digital Web Recovery emerged as a guiding light, leading me out of the darkness and into the light. Their proven track record and exceptional customer service make them the go-to company for fund recovery in Montreal and beyond. If you find yourself adrift in the turbulent waters of investment scams, do not lose hope. Reach out to Digital Web Recovery, Website https://digitalwebrecovery.com and let them be your guiding light in the storm. With their expertise, dedication, and unwavering support, they will help you reclaim what is rightfully yours. Telegram user; @digitalwebrecovery Zohomail; digitalwebexperts@zohomail.com Trust in Digital Web Recovery, and embark on the journey towards recovery Thanks.
 | christy_baker_0622220e4a5 | |
1,868,323 | Javascript Data Types | JavaScript has two main categories of data types: Primitive and Non-Primitive (Reference) types. 1.... | 0 | 2024-05-29T01:34:27 | https://dev.to/__khojiakbar__/javascript-data-types-1d0n | data, types, javascript | **JavaScript has two main categories of data types: Primitive and Non-Primitive (Reference) types.**
**1. Primitive Data Types**
Primitive data types are the most basic types of data, and they include:
**a. Number**
The Number type represents both integer and floating-point numbers. JavaScript does not differentiate between integer and floating-point numbers.
```
let age = 25;
let price = 19.99;
```
**b. String**
The String type represents a sequence of characters. Strings can be enclosed in single quotes ('), double quotes ("), or backticks (`) for template literals.
```
let greeting = "Hello, world!";
let name = 'John Doe';
let message = `Hello, ${name}!`;
```
**c. Boolean**
The Boolean type has only two values: true or false. It is typically used in conditional statements.
```
let isVerified = true;
let hasAccess = false;
```
**d. Undefined**
A variable that has been declared but not assigned a value is of type undefined.
```
let x;
console.log(x); // undefined
```
**e. Null**
The null type represents the intentional absence of any object value. It is one of JavaScript's primitive values.
```
let emptyValue = null;
```
**f. Symbol (introduced in ES6)**
A Symbol is a unique and immutable primitive value often used as the key of an object property.
```
let sym1 = Symbol('identifier');
let sym2 = Symbol('identifier');
console.log(sym1 === sym2); // false
```
**g. BigInt (introduced in ES11)**
The BigInt type is used for representing integers that are too large to be represented by the Number type.
```
let bigNumber = BigInt(1234567890123456789012345678901234567890n);
```
**2. Non-Primitive (Reference) Data Types**
Non-primitive data types can hold collections of values and more complex entities. These include:
`a. Object`
Objects are collections of key-value pairs. Keys are strings (or Symbols), and values can be any type.
`let person = {
name: 'Alice',
age: 30,
greet: function() {
console.log('Hello!');
}
};
console.log(person.name); // Alice
person.greet(); // Hello!`
**b. Array**
Arrays are ordered collections of values. Arrays are objects, and their elements can be of any type.
`let fruits = ['Apple', 'Banana', 'Cherry'];
console.log(fruits[1]); // Banana`
**c. Function**
Functions are objects that can be called to perform actions.
`function add(a, b) {
return a + b;
}
let sum = add(5, 10);
console.log(sum); // 15`
**d. Date**
The Date object represents a single moment in time. It is used to work with dates and times.
`javascript
Copy code
let now = new Date();
console.log(now); // Current date and time`
e. RegExp
The RegExp object represents regular expressions and is used for pattern matching in strings.
`
let pattern = /hello/;
let str = 'hello world';
console.log(pattern.test(str)); // true`
| __khojiakbar__ |
1,868,322 | Contemplating Internet Inequality in Brazil | Hi everyone! Hope you're doing well during these quarantine days~ While I'm using my mother's... | 0 | 2024-05-29T01:28:32 | https://dev.to/xo_xo_5867d1fbc28f5808892/contemplating-internet-inequality-in-brazil-141c | todayilearned | Hi everyone! Hope you're doing well during these quarantine days~
While I'm using my mother's computer, waiting for my new PC to arrive, I was approved in a Brazilian program about Internet Governance. I never had the curiosity to learn about it such as in-depth as I am having now. It's a very important topic for us, Internet users, and I hope that you read at least some topics about it after reading this blog post.
As our first task, it was created a mailing list between teams of approved people all over the country and we've been discussing some essential themes and something has been quoted a lot in my team: Internet Inequality.
As young people and mostly not working for the government, we are limited to saying they should invest more in education, accessibility, but as we all know, this is not a big priority for them, since even the President and Education Minister are more worried about defeating the leftists than about doing their work.
Nowadays, with the pandemic, this problem has been highlighted with campaigns such as #AdiaENEM (demanding to cancel/postpone the university entrance exams this year) and local campaigns on public schools and universities for not digitalizing their classes (as a private school would do, for example) before all of the students have access to an Internet connection at their homes.
Remote work has also been seen as a solution to some areas such as journalism, programming, et cetera. But, as this LinkedIn blog post by Camila Achutti (in Portuguese) could tell, not everyone has the perfect conditions to work on-line and this should be considered.
The Internet contains information and resources for better education. While its access is not an actual Human Right, it is the main form of information exchange worldwide and the lack of internet access is a lack of reliable and on-time information. For the UN, as stated in this last hyperlink, it's a way to interrupt access to education and freedom of thought/expression, which are actual Human Rights.
So, how do we democratize this access in the middle of a pandemic that is almost obligating us to find new ways to work, to live our lives differently?
Mostly, when we ask ourselves or even official organs this question, we are spammed by the "with public policies" answer. But which public policies? What are the people we voted doing, for making it a thing? As I write this article, the national research "TIC Domicílios" concluded that 3/4 of Brazilians have access to the Internet at their homes. Brazil is populated by more than 212 million people. That means at least 53 million do not have this access to information. That's a lot.
What are the "public policies" doing to help these 53m people get access to the Internet? I googled it up and almost everything I found is almost outdated - most articles are from the first semester of 2016, when Dilma Rousseff was still our President, four years and two governments ago. More recent governments have been doing few - or even nothing - to promote on-line equality.
That was when the "Marco Civil da Internet" (our net neutrality laws) was approved and started working. Since then, I couldn't search for any relevant public policies on democratizing Internet access. That could mean it's not a priority for the federal government.
Both broadband and mobile connections have a broad reach in the country, excluding only a few areas. But not everyone in the reached areas has access to a smartphone or a computer, for example. I'm not saying the government should simply give all of them an iPhone, but at least they should be aware of this condition when digitalizing documents, creating an app for receiving the emergency help from a bank and other exclusive actions for people who have smartphones.
Let's not forget that this last app has suffered a lot since its beginning, remembering the CPF (our social security number) value in the sign-up page was programmed to be an "integer", not a "char" value, excluding numbers that started with zero and that a LOT of people are robbing identities to receive the money.
So, I guess the population itself has to stand up and fight for its rights to information and connection. But how?
As the #AdiaENEM was made mostly by privileged (but heureusement woke) students who had access to Twitter at the time, we will need people who also have access to help with that fight. But only trending a hashtag may not work as well as it did with the ENEM test. We should create actions and campaigns that actually help to bring the Internet to the less privileged, instead of only contemplating numbers and wondering when will someone do something.
Beyond the access of poor people, we should also consider the access of people with disabilities, people of color, and other minorities, such as women and the LGBTQIA+. That makes it even harder and bureaucratic to plan, even in the long term.
[https://betbrasil.org] | xo_xo_5867d1fbc28f5808892 |
1,868,321 | Washers Decoded: Types, Uses, and Benefits | Washers Decoded: Types, Uses, and Benefits Washers are a sort of hardware used to distribute the load... | 0 | 2024-05-29T01:26:35 | https://dev.to/david_villanuevalr_86c0b6/washers-decoded-types-uses-and-benefits-5f90 | decoded | Washers Decoded: Types, Uses, and Benefits
Washers are a sort of hardware used to distribute the load of the fastener such as for example screws or bolts. They are available in differing kinds and sizes depending on the application. We'll decode the types, uses, and advantages of washers.
Features of Using Washers
Washers provide several advantages when used with fasteners. The bonus first that they distribute the load for the fastener over a bigger surface which reduces the stress on the product being fastened. This decreases the opportunity for the material breaking or cracking under load.
Another advantage of utilizing washers is the fact that they offer a area smooth the nut or bolt head to rotate on. This reduces the opportunity of the nut or bolt mind binding or seizing as they are tightened.
Innovation in Washers
As time passes, washers have been innovated to supply more benefits. One innovation such the split washer. Split washers have a split at the center which exerts a pressure spring-like the fastener. It will help to avoid the fastener from loosening due to vibration or other forces.
Another innovation is the lock washer. Lock washers have teeth or ridges on the surface which grip the material being fastened. This gives opposition additional the fastener loosening as a result of vibration or other forces.
How to Use Washers
To employ a washer, first, make sure that the Customized washer could be the size right the fastener getting used. The washer must certainly be placed between the nut or bolt head therefore the material being fastened. The surface flat of washer ought to be facing the product being fastened.
Whenever tightening the nut or bolt, ensure it is tightened to your torque environment suitable. This will ensure that the fastener is secure without which could harm the product being fastened.
Service and Quality of Washers
Whenever choosing a washer provider, it's important to ensure that they supply top-quality washers. High-quality washers are manufactured to exacting tolerances which helps to ensure that they can fit correctly using the fastener used. It will help to present load maximum as well as the benefits noted above.
Application of Washers
Washers are utilized in an assortment wide of. They could be utilized in construction, gear manufacturing, automotive, aerospace, as well as other companies. With respect to the application, the size and sort of washer can vary.
For instance, in construction, lock washer starlock are accustomed to distribute load on structural steel bolts. In the industry automotive lock washers are acclimatized to avoid vibration from loosening nuts and bolts. Into the aerospace industry, high-strength washers can be used to withstand the extreme forces and environments being harsh.
Source: https://www.cn-hchhardware.com/washers | david_villanuevalr_86c0b6 |
1,868,317 | Detailed Explanation of Perpetual Contract Grid Strategy Parameter Optimization | The perpetual grid strategy is a popular classic strategy on FMZ platform. Compared with the spot... | 0 | 2024-05-29T01:16:55 | https://dev.to/fmzquant/detailed-explanation-of-perpetual-contract-grid-strategy-parameter-optimization-281n | strategy, parameter, contract, fmzquant | The perpetual grid strategy is a popular classic strategy on FMZ platform. Compared with the spot grid, there is no need to have currencies, and leverage can be added, which is much more convenient than the spot grid. However, since it is not possible to backtest on the FMZ Quant Platform directly, it is not conducive to screening currencies and determining parameter optimization. In this article, we will introduce the complete Python backtesting process, including data collection, backtesting framework, backtesting functions, parameter optimization, etc. You can try it yourself in juypter notebook.
### Data Collection
Generally, it is enough to use K-line data. For accuracy, the smaller the K-line period, the better. However, to balance the backtest time and data volume, in this article, we use 5min of data from the past two years for backtesting. The final data volume exceeded 200,000 lines. We choose DYDX as the currency. Of course, the specific currency and K-line period can be selected according to your own interests.
```
import requests
from datetime import date,datetime
import time
import pandas as pd
import numpy as np
import matplotlib.pyplot as plt
import requests, zipfile, io
%matplotlib inline
def GetKlines(symbol='BTC',start='2020-8-10',end='2021-8-10',period='1h'):
Klines = []
start_time = int(time.mktime(datetime.strptime(start, "%Y-%m-%d").timetuple()))*1000
end_time = int(time.mktime(datetime.strptime(end, "%Y-%m-%d").timetuple()))*1000
while start_time < end_time:
res = requests.get('https://fapi.binance.com/fapi/v1/klines?symbol=%sUSDT&interval=%s&startTime=%s&limit=1000'%(symbol,period,start_time))
res_list = res.json()
Klines += res_list
start_time = res_list[-1][0]
return pd.DataFrame(Klines,columns=['time','open','high','low','close','amount','end_time','volume','count','buy_amount','buy_volume','null']).astype('float')
df = GetKlines(symbol='DYDX',start='2022-1-1',end='2023-12-7',period='5m')
df = df.drop_duplicates()
```
### Backtesting Framework
For backtesting, we continue to choose the commonly used framework that supports USDT perpetual contracts in multiple currencies, which is simple and easy to use.
```
class Exchange:
def __init__(self, trade_symbols, fee=0.0004, initial_balance=10000):
self.initial_balance = initial_balance #Initial assets
self.fee = fee
self.trade_symbols = trade_symbols
self.account = {'USDT':{'realised_profit':0, 'unrealised_profit':0, 'total':initial_balance, 'fee':0}}
for symbol in trade_symbols:
self.account[symbol] = {'amount':0, 'hold_price':0, 'value':0, 'price':0, 'realised_profit':0,'unrealised_profit':0,'fee':0}
def Trade(self, symbol, direction, price, amount):
cover_amount = 0 if direction*self.account[symbol]['amount'] >=0 else min(abs(self.account[symbol]['amount']), amount)
open_amount = amount - cover_amount
self.account['USDT']['realised_profit'] -= price*amount*self.fee #Deduction of handling fee
self.account['USDT']['fee'] += price*amount*self.fee
self.account[symbol]['fee'] += price*amount*self.fee
if cover_amount > 0: #Close the position first.
self.account['USDT']['realised_profit'] += -direction*(price - self.account[symbol]['hold_price'])*cover_amount #Profits
self.account[symbol]['realised_profit'] += -direction*(price - self.account[symbol]['hold_price'])*cover_amount
self.account[symbol]['amount'] -= -direction*cover_amount
self.account[symbol]['hold_price'] = 0 if self.account[symbol]['amount'] == 0 else self.account[symbol]['hold_price']
if open_amount > 0:
total_cost = self.account[symbol]['hold_price']*direction*self.account[symbol]['amount'] + price*open_amount
total_amount = direction*self.account[symbol]['amount']+open_amount
self.account[symbol]['hold_price'] = total_cost/total_amount
self.account[symbol]['amount'] += direction*open_amount
def Buy(self, symbol, price, amount):
self.Trade(symbol, 1, price, amount)
def Sell(self, symbol, price, amount):
self.Trade(symbol, -1, price, amount)
def Update(self, close_price): #Updating of assets
self.account['USDT']['unrealised_profit'] = 0
for symbol in self.trade_symbols:
self.account[symbol]['unrealised_profit'] = (close_price[symbol] - self.account[symbol]['hold_price'])*self.account[symbol]['amount']
self.account[symbol]['price'] = close_price[symbol]
self.account[symbol]['value'] = abs(self.account[symbol]['amount'])*close_price[symbol]
self.account['USDT']['unrealised_profit'] += self.account[symbol]['unrealised_profit']
self.account['USDT']['total'] = round(self.account['USDT']['realised_profit'] + self.initial_balance + self.account['USDT']['unrealised_profit'],6)
```
### Grid Backtest Function
The principle of the grid strategy is very simple. Sell when the price rises and buy when the price falls. It specifically involves three parameters: initial price, grid spacing, and trading value. The market of DYDX fluctuates greatly. It fell from the initial low of 8.6U to 1U, and then rose back to 3U in the recent bull market. The default initial price of the strategy is 8.6U, which is very unfavorable for the grid strategy, but the default parameters backtested a total profit of 9200U was made in two years, and a loss of 7500U was made during the period.
```
symbol = 'DYDX'
value = 100
pct = 0.01
def Grid(fee=0.0002, value=100, pct=0.01, init = df.close[0]):
e = Exchange([symbol], fee=0.0002, initial_balance=10000)
init_price = init
res_list = [] #For storing intermediate results
for row in df.iterrows():
kline = row[1] #To backtest a K-line will only generate one buy order or one sell order, which is not particularly accurate.
buy_price = (value / pct - value) / ((value / pct) / init_price + e.account[symbol]['amount']) #The buy order price, as it is a pending order transaction, is also the final aggregated price
sell_price = (value / pct + value) / ((value / pct) / init_price + e.account[symbol]['amount'])
if kline.low < buy_price: #The lowest price of the K-line is lower than the current pending order price, the buy order is filled
e.Buy(symbol,buy_price,value/buy_price)
if kline.high > sell_price:
e.Sell(symbol,sell_price,value/sell_price)
e.Update({symbol:kline.close})
res_list.append([kline.time, kline.close, e.account[symbol]['amount'], e.account['USDT']['total']-e.initial_balance,e.account['USDT']['fee'] ])
res = pd.DataFrame(data=res_list, columns=['time','price','amount','profit', 'fee'])
res.index = pd.to_datetime(res.time,unit='ms')
return res
```
### Initial Price Impact
The setting of the initial price affects the initial position of the strategy. The default initial price for the backtest just now is the initial price at startup, that is, no position is held at startup. And we know that the grid strategy will realize all profits when the price returns to the initial stage, so if the strategy can correctly predict the future market when it is launched, the income will be significantly improved. Here, we set the initial price to 3U and then backtest. In the end, the maximum drawdown was 9200U, and the final profit was 13372U. The final strategy does not hold positions. The profit is all the fluctuation profits, and the difference between the profits of the default parameters is the position loss caused by inaccurate judgment of the final price.
However, if the initial price is set to 3U, the strategy will go short at the beginning and hold a large number of short positions. In this example, a short order of 17,000 U is directly held, so it faces greater risks.
### Grid Spacing Settings
The grid spacing determines the distance between pending orders. Obviously, the smaller the spacing, the more frequent the transactions, the lower the profit of a single transaction, and the higher the handling fee. However, it is worth noting that as the grid spacing becomes smaller and the grid value remains unchanged, when the price changes, the total positions will increase, and the risks faced are completely different. Therefore, to backtest the effect of grid spacing, it is necessary to convert the grid value.
Since the backtest uses 5m K-line data, and each K-line is only traded once, which is obviously unrealistic, especially since the volatility of digital currencies is very high. A smaller spacing will miss many transactions in backtesting compared with the live trading. Only a larger spacing will have reference value. In this backtesting mechanism, the conclusions drawn are not accurate. Through tick-level order flow data backtesting, the optimal grid spacing should be 0.005-0.01.
```
for p in [0.0005, 0.001 ,0.002 ,0.005, 0.01, 0.02, 0.05]:
res = Grid( fee=0.0002, value=value*p/0.01, pct=p, init =3)
print(p, round(min(res['profit']),0), round(res['profit'][-1],0), round(res['fee'][-1],0))
0.0005 -8378.0 144.0 237.0
0.001 -9323.0 1031.0 465.0
0.002 -9306.0 3606.0 738.0
0.005 -9267.0 9457.0 781.0
0.01 -9228.0 13375.0 550.0
0.02 -9183.0 15212.0 309.0
0.05 -9037.0 16263.0 131.0
```
### Grid Transaction Value
As mentioned before, when the fluctuations are the same, the greater the value of the holding, the risk is proportional. However, as long as there is no rapid decline, 1% of the total funds and 1% of the grid spacing should be able to cope with most market conditions. In this DYDX example, a drop of almost 90% also triggered a liquidation. However, it should be noted that DYDX mainly falls. When the grid strategy goes long when it falls, it will fall by 100% at most, while there is no limit on the rise, and the risk is much higher. Therefore, Grid Strategy recommends users to choose only the long position mode for currencies they believe have potential.
From: https://blog.mathquant.com/2023/12/11/detailed-explanation-of-perpetual-contract-grid-strategy-parameter-optimization.html | fmzquant |
1,868,316 | RJ45 Connector Ethernet: The Key to High-Speed Data Transmission | RJ45 Connector Ethernet: The Key to High-Speed Data Transmission Introduction Are you tired of... | 0 | 2024-05-29T01:15:59 | https://dev.to/david_villanuevalr_86c0b6/rj45-connector-ethernet-the-key-to-high-speed-data-transmission-3o07 | data | RJ45 Connector Ethernet: The Key to High-Speed Data Transmission
Introduction
Are you tired of waiting for hours for your files to download and upload? Are you struggling with low-speed internet connections? Say goodbye to your worries and say hello to Ethernet! This little device is the key to high-speed data transmission that will change the way you work and stream. We will discuss the advantages, innovation, safety, use, how to use, service, quality, and application of RJ45 Connector Ethernet.
Advantages of RJ45 Connector Ethernet
RJ45 Connector Ethernet could be the solution like perfect high-speed data transfer, providing data transfer speeds as much as 10Gbps
This implies you can actually transfer a 1GB file in under 10 moments, which makes it the decision like ideal companies and houses
The connector could be suitable for both PC and Mac, ensuring simplicity of use for most users
Innovation in RJ45 Connector Ethernet
The rj45 connector Ethernet is a high-tech innovation this is certainly changing the way we make an search like online
Its small size and installation like not hard it is an device like crucial those who who requires high-speed data transfers
You having a quick and connection to the internet like reliable whether you are utilizing your computer in your home, at work, or on the go, RJ45 Connector Ethernet can provide
Safety of RJ45 Connector Ethernet
RJ45 Connector Ethernet was created with safety in your mind
It offers safety like built-in that protect users from electrical hazards and supply security against electromagnetic disturbance
The connector includes a shielded design that ensures the transmission of signals is obviously not influenced by outside interferences such as for instance radio waves, cell phones, or other products which can be electronic
Usage of RJ45 Connector Ethernet
RJ45 Connect Ethernet is simple to work with, and it's also ideal for most products which are networking
The connector may help link computers, laptops, routers, switches, as well as other network devices
It can be employed to transfer files, videos, music, and also other information
Just how to Use RJ45 Connector Ethernet
To make use of RJ keystone connector rj45 Ethernet, you should insert the connector in to the slot like ethernet on your own desktop or other device like networking
Once you have inserted the connector, it is going to immediately detect and configure itself
When you will definitely expect you'll access the world-wide-web at high rates that one may configure the network settings, and
Provider and Quality of RJ45 Connector Ethernet
Our items are often fashioned with excellent quality assurance to ensure our customers find the best outcomes possible
We offer exceptional service, and our products are examined to be sure they meet or surpass industry criteria
Application of RJ45 Connector Ethernet
The RJ45 Connector Ethernet is employed in many different industries such as IT, news, banking, training, healthcare, and video gaming
Its great for companies, domiciles, and folks who need a fast and connection to the internet like dependable
Conclusion
In conclusion, RJ4connector rj45 cat 6 Ethernet is the key to high-speed data transmission. It provides users with a fast, reliable, and safe internet connection, making it a popular choice for businesses and homes. With its easy-to-use and innovative design, RJ45 Connector Ethernet is the perfect solution for those who need a high-speed network. Our products are designed to ensure quality and customer satisfaction, and we are dedicated to providing the best service possible. Try RJ45 Connector Ethernet today and experience the difference it can make!
Source: https://www.hy-connect.com/application/connector-rj45-cat-6 | david_villanuevalr_86c0b6 |
1,868,312 | Powering Innovation: Hebei Huatong's Wide Range of Cable Products | Powering Innovation with Hebei Huatong's Cable Products Intro Cables are the foundation of... | 0 | 2024-05-29T01:00:23 | https://dev.to/david_villanuevalr_86c0b6/powering-innovation-hebei-huatongs-wide-range-of-cable-products-46kj | cable | Powering Innovation with Hebei Huatong's Cable Products
Intro
Cables are the foundation of contemporary culture, powering houses, workplaces, as well as markets. Hebei Huatong is a business that focuses on the production of a wide variety of cables for various requests. Their cables are ingenious, risk-free as well as top quality. We'll check out the benefits of Hebei Huatong's cable products as well as exactly how they could be utilized towards energy innovation.
Benefits of Hebei Huatong's Cable Products
Hebei Huatong's electrical cable are actually above others in lots of methods. They are used in progressed innovation, which guarantees that they are resilient as well as lasting. The cables are likewise versatile, making all of them simple to set up in various setups. This makes all of them perfect for utilization in markets like aerospace, automobile, building, as well as telecom, to name a few.
Innovation
Hebei Huatong is dedicated to constant innovation in the cable market. They have a group of designers that function tirelessly to create brand-brand new as well as much a lot better cable products. This guarantees that they remain in front of the competitors as well as satisfy the altering requirements of their clients. Hebei Huatong's dedication to innovation has made all of them credibility as dependable as well as ingenious cable producers.
Security
Security is a leading concern for Hebei Huatong. They utilize top-quality products as well as follow stringent security requirements throughout the production procedure. This guarantees that their cables satisfy market requirements as well as are risk-free towards utilization. Clients can easily count on Hebei Huatong's cables for energy in their houses, workplaces, as well as markets without fretting.
Utilize
Hebei Huatong's solar panel cable are flexible as well as could be utilized in different requests. They could be utilized for energy houses, workplaces, as well as markets. They can easily likewise be utilized in specific markets like aerospace as well as automobile. Hebei Huatong's cables are available in various dimensions as well as kinds, making it simple to discover the appropriate cable for your requirements.
Ways to Utilize
When utilizing Hebei Huatong's cables, it is essential to comply with the manufacturer's directions. The cables ought to be chosen based on their meant utilization as well as application. This guarantees that they are utilized securely as well as efficiently. It is likewise essential to utilize the appropriate devices as well as devices when setting up the cables to avoid damages as well as guarantee appropriate setup.
Solution
Along with top-quality products, Hebei Huatong likewise provides outstanding customer support. They have a group of professionals that can easily respond to any type of concerns or even issues that clients might have. They likewise deal with after-sales sustain to guarantee that their clients are pleased with their acquisition. This creates purchasing as well as utilizing Hebei Huatong's cables as a hassle-free expertise.
Quality
Hebei Huatong's cables are actually of the greatest quality. They are produced utilizing the most recent innovation as well as following stringent quality requirements. This guarantees that they are dependable, effective, as well as lasting. Clients can easily count on Hebei Huatong's cables for energy in their houses as well as markets with very little downtime.
Application
Hebei HuPatong's submersible cable could be utilized in different commercial as well as domestic requests. They could be utilized for energy houses, workplaces, as well as markets like aerospace, automobile, as well as telecom. Hebei Huatong's cables are perfect for requests that need resilience, versatility, as well as security.
Source: https://www.htcablewire.com/application/electrical-cable
| david_villanuevalr_86c0b6 |
1,868,308 | How to Change .NET C# Report Control Properties at Runtime | Learn how to change .NET C# report control properties at runtime. See more from ActiveReports today. | 0 | 2024-05-29T00:58:19 | https://developer.mescius.com/blogs/how-to-change-net-c-sharp-report-control-properties-at-runtime | webdev, devops, tutorial, csharp | ---
canonical_url: https://developer.mescius.com/blogs/how-to-change-net-c-sharp-report-control-properties-at-runtime
description: Learn how to change .NET C# report control properties at runtime. See more from ActiveReports today.
---
**What You Will Need**
- ActiveReports.NET
- Visual Studio 2017 - 2022 for Code-Based Section Reports
**Controls Referenced**
- [Section Report Scenarios](https://developer.mescius.com/activereportsnet/docs/latest/online/tutorials-section-report-scenarios.html)
- [Expressions](https://developer.mescius.com/activereportsnet/docs/latest/online/expressions.html)
- [Code-based Section Reports in .NET Core](https://developer.mescius.com/activereportsnet/docs/latest/online/designing-code-based-section-reports-in-net-core.html)
- [Report Events](https://developer.mescius.com/activereportsnet/docs/latest/online/report-events.html)
**Tutorial Concept**
Learn how to dynamically adjust properties of .NET C# report controls in real-time. Explore efficient methods for modifying control properties to enhance the functionality and aesthetics of your reports effortlessly.
---
When it comes to dynamically altering control properties at runtime in reports, the approach can vary depending on the type of report being used - whether it's a Section-based report or a Page/RDL-based report. In this article, we will look at the procedure for each of the following report types:
* [Page and RDL Reports](#Page)
* [Code-Based Section Reports](#Code)
* [XML-Based Section Reports](#XML)
## <a id="Page"></a>Page and RDL Reports
In a Page or RDL Report, you can change control properties at run time by adding code to expressions in the control properties. See examples below.
**Note**: You can set an expression in any property whose type is ExpressionInfo. However, you cannot change control properties like Location or Size. Since a Page report is designed to have a WYSIWYG output, we don't allow size and location settings to be changed at run time.
### Change the Output Value
To change the output value, find the control's Value property in the Properties Window and click the drop-down arrow button to select <Expression...>. With the Expression Editor open, enter an expression like the following (replacing _FieldName_ with the name of your field):
```
=Switch(Fields!_FieldName_.Value="1","string1", Fields!_FieldName_.Value="2","string2", Fields!_FieldName_.Value="3","string3", Fields!_FieldName_.Value<>"","stringX")
```
### Conditional Formatting
To conditionally format specific values, for example, displaying all negative values in Italics, set the Font.FontStyle property to the following expression:
```
=IIF(Fields!_FieldName_.Value<0,"Italic","Normal")
```
### Show Only on the Specific Page
To set a field to show only on the report's final page, find the control's Value property in the Properties Window and click the drop-down arrow to select _<Expression...>_. With the Expression Editor open, enter an expression like the following:
```
=IIF(Globals!PageNumber=Globals!TotalPages, Fields!_FieldName_.Value,"")
```
For more information about expressions and examples of Page and RDL reports, visit the following topics in our User Guide: [Expressions](https://developer.mescius.com/activereportsnet/docs/latest/online/expressions.html "https://developer.mescius.com/activereportsnet/docs/latest/online/expressions.html") | [Create Red Negatives Report](https://developer.mescius.com/activereportsnet/docs/latest/online/create-red-negatives-greenbar-report.html "https://developer.mescius.com/activereportsnet/docs/latest/online/create-red-negatives-greenbar-report.html") | [Create Green Bar Report](https://developer.mescius.com/activereportsnet/docs/latest/online/create-red-negatives-greenbar-report.html "https://developer.mescius.com/activereportsnet/docs/latest/online/create-red-negatives-greenbar-report.html") | [Expressions in Reports](https://developer.mescius.com/activereportsnet/docs/latest/online/expressions.html "https://developer.mescius.com/activereportsnet/docs/latest/online/expressions.html") | [Reports with Custom Code](https://developer.mescius.com/activereportsnet/docs/latest/online/designing-code-based-section-reports-in-net-core.html "https://developer.mescius.com/activereportsnet/docs/latest/online/designing-code-based-section-reports-in-net-core.html")
## <a id="Code"></a>Code-Based Section Reports
In a Section report, you can change control properties at run time by adding code to report events. For example, the following code changes the text property of a Label in C# and VB.NET:
#### C#:
```
private void detail_Format(object sender, EventArgs e)
{
string s;
switch (this.label1.Text)
{
case "1": s = "string 1"; break;
case "2": s = "string 2"; break;
case "3": s = "string 3"; break;
default: s = "string X"; break;
}
this.label1.Text = s;
// (**1) Move a Label control from its original location to: (X,Y) = (1,0)
this.label2.Location = new System.Drawing.PointF(1,0);
// (**2) Set the Font property for a Label control to: "Bold,Arial,14pt,Italic"
this.label3.Font = new System.Drawing.Font("Arial", 14.0F,
FontStyle.Bold | FontStyle.Italic,
GraphicsUnit.Point,1);
}
```
#### VB.NET:
```
Private Sub Detail_Format(…) Handles Detail.Format
'Change the value of the Text property for a Label control.
Dim s As String
Select Case Me.Label1.Text
Case "1" : s = "string 1"
Case "2" : s = "string 2"
Case "3" : s = "string 3"
Case Else : s = "string X"
End Select
Me.Label1.Text = s
' (**1) Move a Label control from its original location to: (X,Y) = (1,0)
Me.Label2.Location = new System.Drawing.PointF(1, 0)
' (**2) Set the Font property for a Label control to: "Bold,Arial,14pt,Italic"
Me.Label3.Font = new System.Drawing.Font("Arial", 14.0F,
FontStyle.Bold Or FontStyle.Italic,
GraphicsUnit.Point,1)
End Sub
```
(**1) You cannot directly change members of the Location object (e.g., Location.X) that are returned from this property because Location property values are indicated in numeric type. To change the Location property at run time, you need to create a new instance of the System.Drawing.PointF class to match the data type of the Location property.
(**2) The values of the Font property are ReadOnly, so you cannot directly change the value of Font.Name. To change the Font property at run time, you must create a new instance of the Font object.
**Important**: You can change a control's properties only within the events for the section that contains the control (e.g., Detail_Format, PageHeader_BeforePrint, or GroupFooter_AfterPrint) or within the ReportStart event. You can also change properties at the report instance creation level in code outside the report with a private or public modifier. For more information, see the following topics in the ActiveReports help file: [Section Report Events](https://developer.mescius.com/activereportsnet/docs/latest/online/report-events.html "https://developer.mescius.com/activereportsnet/docs/latest/online/report-events.html") | [Conditional Scenarios](https://developer.mescius.com/activereportsnet/docs/latest/online/tutorials-section-report-scenarios.html "https://developer.mescius.com/activereportsnet/docs/latest/online/tutorials-section-report-scenarios.html") | [Create Green Bar Report](https://developer.mescius.com/activereportsnet/docs/latest/online/create-green-bar-reports.html "https://developer.mescius.com/activereportsnet/docs/latest/online/create-green-bar-reports.html")
## <a id="XML"></a>XML-Based Section Reports
In an XML-Based Section report (and Section Reports in the End-User Designer), you can change control properties at run time by adding the script to report events in the script tab. For example, the following code changes the text property of a Label in C# and VB.NET:
#### C#:
```
public void Detail_Format()
{
string s;
switch (this.Label1.Text)
{
case "1": s = "string 1"; break;
case "2": s = "string 2"; break;
case "3": s = "string 3"; break;
default: s = "string X"; break;
}
this.Label1.Text = s;
// (**1) Move a Label control from its original location to: (X,Y) = (1,0)
this.Label2.Location = new System.Drawing.PointF(1,0);
// (**2) Set the Font property for a Label control to: "Bold,Arial,14pt,Italic"
this.Label3.Font = new System.Drawing.Font("Arial", 14.0F,
FontStyle.Bold | FontStyle.Italic,
GraphicsUnit.Point,1);
}
```
#### VB.NET:
```
Sub Detail_Format
'Change the value of the Text property for a Label control.
Dim s As String
Select Case Me.Label1.Text
Case "1" : s = "string 1"
Case "2" : s = "string 2"
Case "3" : s = "string 3"
Case Else : s = "string X"
End Select
Me.Label1.Text = s
' (**1) Move a Label control from its original location to: (X,Y) = (1,0)
Me.Label2.Location = new System.Drawing.PointF(1, 0)
' (**2) Set the Font property for a Label control to: "Bold,Arial,14pt,Italic"
Me.Label3.Font = new System.Drawing.Font("Arial", 14.0F,
FontStyle.Bold Or FontStyle.Italic,
GraphicsUnit.Point,1)
End Sub
```
## Conclusion
In summary, while both Section-based and Page/RDL-based reports offer ways to change control properties dynamically at runtime, the methods and techniques may vary depending on the underlying structure and features of the reporting tool being used. Understanding the capabilities and best practices for each type of report can help developers create more flexible and interactive reporting solutions.
There is a lot more to dynamic reporting with ActiveReports. Check out the latest version to test these features and more for yourself. | chelseadevereaux |
1,868,311 | Javascript versions | JavaScript (JS) versions are essentially iterations of the language defined by the ECMAScript (ES)... | 0 | 2024-05-29T00:55:27 | https://dev.to/__khojiakbar__/javascript-versions-511n |
JavaScript (JS) versions are essentially iterations of the language defined by the ECMAScript (ES) standard, which is managed by the Ecma International organization. These versions bring new features, improvements, and fixes to the language. Below is a detailed explanation of the key versions and their major features:
**ES1 (1997)**
The first edition of ECMAScript, laying the foundational syntax and features of JavaScript.
**ES2 (1998)**
Introduced minor updates and bug fixes to the initial specification.
**ES3 (1999)**
**Major Features:**
Regular Expressions: Patterns for matching character combinations in strings.
Try/Catch: Error handling mechanism.
More robust string manipulation methods.
**ES5 (2009)
Major Features:**
**Strict Mode:** A restricted variant of JavaScript for catching common coding errors.
**JSON Support:** Methods for parsing and generating JSON data.
**Array Methods:** Higher-order functions like map(), filter(), forEach(), and reduce().
**Property Attributes:** Control over property behaviors (enumerable, configurable, writable).
**ES6 / ECMAScript 2015: The Big Leap
Major Features:**
**Let and Const: **Block-scoped variable declarations.
**Arrow Functions:** Shorter syntax for functions, with lexical this binding.
**Classes:** Syntactical sugar for prototype-based inheritance.
**Template Literals:** String interpolation and multi-line strings using backticks.
**Destructuring Assignment:** Unpacking values from arrays or objects into distinct variables.
**Modules:** import and export statements for modular code.
Promises: Better asynchronous programming with then and catch.
**Default Parameters:** Setting default values for function parameters.
**Spread and Rest Operators:** For arrays and function arguments.
**ES7 / ECMAScript 2016
Major Features:**
Exponentiation Operator: ** for power calculations.
**Array.prototype.includes():** Check if an array includes a certain element.
**
ES8 / ECMAScript 2017
Major Features:**
**Async/Await:** Syntactic sugar for promises, making asynchronous code look synchronous.
**Object.entries() and Object.values(): **Methods to get object keys/values.
**String Padding:** padStart() and padEnd() for string padding.
**ES9 / ECMAScript 2018**
**Major Features:**
**Asynchronous Iteration:** for await...of loops.
**Promise.finally():** A method that executes a callback when a promise is settled.
**Rest/Spread Properties for Objects:** Combining or splitting object properties.
**ES10 / ECMAScript 2019
Major Features:**
**Array.flat() and Array.flatMap():** Flattening nested arrays.
**Object.fromEntries():** Transforms a list of key-value pairs into an object.
**String.trimStart() and String.trimEnd():** String trimming methods.
**Optional Catch Binding:** Omit the error parameter in catch.
**ES11 / ECMAScript 2020
Major Features:**
**BigInt:** A new data type for arbitrarily large integers.
**Dynamic Import: **import() function for dynamic module loading.
**Nullish Coalescing Operator (??):** Provides a way to fall back to default values only when dealing with null or undefined.
**Optional Chaining (?.):** Safely access deeply nested properties.
**ES12 / ECMAScript 2021
Major Features:**
**Logical Assignment Operators:** (&&=, ||=, ??=) for more concise code.
**Numeric Separators:** Improve readability of numeric literals (1_000_000).
**String.replaceAll():** Replaces all occurrences of a substring.
**ES13 / ECMAScript 2022
Major Features:**
**Top-Level Await: **Await at the top level of modules.
**Class Fields and Private Methods:** Define fields and private methods in classes.
**Ergonomic Brand Checks for Private Fields: **Simplifies working with private fields in classes.
**How to Check JavaScript Version**
JavaScript environments (browsers, Node.js, etc.) often support different subsets of ECMAScript features. To check which version or features are supported, you can:
Use feature detection with typeof, in, or try/catch.
Check the compatibility tables on resources like MDN Web Docs.
Use online tools like caniuse.com to see browser support for specific features.
**Importance of Keeping Up-to-Date**
**Performance Improvements:** New versions often bring optimizations.
**New Features:** Utilizing the latest features can make development faster and code more readable.
**Security Enhancements:** Newer versions address security vulnerabilities.
**Community and Ecosystem:** Staying current with the language helps in collaborating and using modern libraries/frameworks. | __khojiakbar__ | |
1,868,307 | SAP BTP, RISE and AWS network patterns | SAP's BTP ( Business Technology Platform) is a SaaS offering where SAP is providing various... | 0 | 2024-05-29T00:45:06 | https://dev.to/sourabh_chordiya_08c34bcc/sap-btp-rise-and-aws-network-patterns-1765 | saponaws, sapbtp, risewithsap, aws | SAP's BTP ( Business Technology Platform) is a SaaS offering where SAP is providing various integration and development services. The key focus of BTP is to keep the SAP ERP core cleaner, less customized in other words, and rely on these services to create integrations and deliver front-end services. While customers are in the process of determining use-cases to leverage this, they typically see that both BTP and AWS will be used. Typically, customers have their ERP systems in IaaS setup on AWS, and they leverage BTP on AWS as well. Let's first understand the scenarios that can exist and then cover how network design can be defined for these scenarios.
1. Customer is using their SAP systems in IaaS setup on AWS and are leveraging BTP services as well on AWS
2. Customer is using their SAP systems in IaaS setup on another cloud or on-premise and plans to deploy BTP services on AWS
3. Customer is using SAP under RISE with SAP on AWS setup and plans to leverage BTP on AWS
In each of the above cases, several AWS services can be used to minimize latency and keep traffic secure while configuring the interfaces.
<u>SAP systems and BTP both on AWS</u> - The communication in this case can be kept away from internet completely, reducing the surface area for attackers. The AWS PrivateLink for SAP (AWS PrivateLink and SAP on AWS Deployments - DZone) addresses this use-case. PrivateLink provides an endpoint on SAP owned AWS Account that runs BTP called Interface VPC Endpoint. This endpoint can be connected from any AWS service in AWS account owned by customer using the so-called AWS PrivateLink or SAP PrivateLink in the manner described in below image, which is further elaborated in referenced blog. (Image Ref - How to connect SAP BTP Services with AWS Services using SAP Private Link Service | AWS for SAP (amazon.com))
<u>SAP on another cloud or on-premises while BTP services are on AWS</u> - In this case, if there is an existing VPN or Direct Connect established between on-premises and AWS, the same can be leveraged to enhance security. PrivateLink cannot be used in these scenarios as the PrivateLink services are a native scenario exclusively available for connectivity between various services within AWS but on different accounts. In such multi-cloud scenarios, network traversal must be over internet, unless customer has private connectivity with each of the service provider that they wish to use BTP services and SAP Infrastructure services. There are 2 possible scenarios, either customer has these connectivity setups with both cloud providers from their own managed data centers or this setup can be performed via a Multi-Cloud Connectivity provider, for example F5.
<u>RISE with SAP on AWS and BTP on AWS</u> - RISE with SAP is an SAP construct in which the SAP support team manages AWS Accounts, Infrastructure and SAP Platform, which provides customer an "Enterprise Software as a Service" experience. The actual SAP systems run in IaaS manner from the SAP perspective, however customer does not need to worry about the IaaS as SAP manages it completely along with all Operational tasks. RISE with SAP on AWS provides BTP Platform Credits which further makes it easier for customers to start leveraging BTP. From an architectural perspective, this setup can be performed in same manner as above, however, SAP need to enable the Load Balancer and accept the BTP endpoint connectivity request in their VPC (to be further checked and image to be updated.
Network in AWS can lead to challenges related to latency that can impact the performance.
It is necessary that a consideration is made in terms of latency requirements and accordingly the right design is chosen. The key considerations are below -
1. Choosing the location of various components - The cloud deployments brings plenty of choices and with options discussed above, there is always a possibility of customer setting up a multi-cloud deployment. In such cases, its important that the end-user location, SAP systems deployment location, and the SAP BTP services deployment location are as close as possible, which will minimize latency. It should be noted that with global user base for large enterprises, this may not be possible in all cases.
2. Ensuring the routing is setup correctly - It is observed in many deployments that even when servers are setup closely, there are lot of hops for packets introduced due to routing issues. Always perform a trace route of the traffic to ensure that this problem is not increasing latency and keep the hops to minimal by changing routing. Route Manager, a part of AWS Network Manager, can help diagnose and correct such problems.
3. Data being transferred is chosen carefully - The BTP is a processing engine, whereas core ERP system is a data store. It might happen that lot of data is transferred over to BTP , which can eventually increase throughput and slow down the end-to-end flow processing. Always perform the selection within ERP and transfer the data chunks that are as small as possible, which can be transferred multiple times if required.
SAP BTP and SAP on AWS can help customers transform their SAP business processes to ensure that the systems are ready for new-age integrations and the innovations. It is a necessity for any SAP customer now to consider these options carefully and decide their roadmap based on the available options and the customer's future roadmap for overall transformation and digitalization journey.
Image Ref - https://community.sap.com/t5/technology-blogs-by-sap/business-continuity-with-rise-and-btp-part-3-technical-building-blocks-in/ba-p/13574997
| sourabh_chordiya_08c34bcc |
1,868,306 | Exploring the Capabilities of the Docker Engine | Introduction Docker has revolutionized the way software is developed, shipped, and... | 0 | 2024-05-29T00:33:11 | https://dev.to/kartikmehta8/exploring-the-capabilities-of-the-docker-engine-j4g | webdev, javascript, beginners, programming | ## Introduction
Docker has revolutionized the way software is developed, shipped, and deployed. As a containerization tool, Docker allows developers to package their applications and dependencies into portable and easily deployable containers. At the heart of this innovative technology lies the Docker Engine, a powerful tool that enables the creation and management of containers. In this article, we will explore the capabilities of the Docker Engine, its advantages and disadvantages, and the key features that make it a popular choice among developers.
## Advantages of the Docker Engine
1. **Lightweight and Efficient:** The Docker Engine provides a lightweight and efficient platform for running applications in isolated containers. This allows for better resource utilization and scalability.
2. **Cross-Platform Compatibility:** Containers can be easily deployed on any operating system that supports Docker, providing a flexible and consistent environment for running applications.
3. **Speed and Ease of Deployment:** With its simple and intuitive commands, developers can quickly spin up containers, making the development and testing process more efficient.
## Disadvantages of the Docker Engine
1. **Learning Curve:** Developers need to understand the underlying technology and its components before effectively using the Docker Engine.
2. **Lack of Graphical User Interface (GUI):** While the command-line interface (CLI) is powerful and efficient, it may not be suitable for all developers, especially those who are new to containerization.
## Key Features of the Docker Engine
1. **Multiple Container Management:** The Docker Engine can create and manage multiple containers on a single host, providing efficient resource management.
```bash
# Start multiple containers with Docker
docker run -d --name webapp nginx
docker run -d --name database mongo
```
2. **Built-In Networking Capabilities:** Containers can communicate with each other and with the external network, enabling the development of complex applications with interconnected containers.
```bash
# Connect containers with Docker networking
docker network create app-network
docker network connect app-network webapp
docker network connect app-network database
```
3. **Robust Security Framework:** Docker ensures that containers are isolated and have access only to necessary resources, enhancing application security.
```bash
# Manage Docker container security
docker run -d --name secure-app --security-opt seccomp=unconfined nginx
```
## Conclusion
The Docker Engine has revolutionized the way we develop and deploy software. With its impressive capabilities, lightweight design, and efficient performance, it has become a must-have tool for modern developers. While it has a few limitations, its advantages and features far outweigh any drawbacks. As the technology continues to evolve, we can expect to see even more innovative features and enhancements that will further improve the capabilities of the Docker Engine.
| kartikmehta8 |
1,868,305 | Cracking the Clicks: Pursuing as Google Ads/Pay Per Click (PPC) Expert | In today's world, we are caught in the attention war of the digital modernized age. Here every... | 0 | 2024-05-29T00:31:52 | https://dev.to/liong/cracking-the-clicks-pursuing-as-google-adspay-per-click-ppc-expert-2ngb | google, ppc, malaysia, kualalumpur | In today's world, we are caught in the attention war of the digital modernized age. Here every business battles to be visible to the potential customer or another audience, and that is where PPC (pay-per-click) advertising lends a hand. However, the PPC world can be crippling to guide through and Google Ads is a clear bean in the bunch. Don't worry fellow entrepreneurs!!! So, here in this blog, your godfather is going to uplift the power of [Google Ads](https://ithubtechnologies.com/google-advertising-malaysia/?utm_source=dev.to&utm_campaign=googleadsandppc&utm_id=Offpageseo+2024) and PPC towards your better marketing, this will give you an idea of how Google ads and PPC works.
## Understanding the Clickoncomics — PPC101
Get this — You only get paid when someone clicks on your ad. That's the magic of PPC. You choose particular keywords that your potential customers might search for, and then, when those keywords are used in Google Search or any other compatible website (or app), your ad will appear just above the organic search results. The more the research by the people according to the use of keywords means the more the organic search, so more traffic, and more clicks, and at least you will be paid more. When there is a click on your ad then the traffic goes to your website, landing page, or online store and it has people who will most likely become our customers that are coming straight in.
## Why Google Ads? The King of the Clicks
When it comes to PPC, Google Ads are the king. Why? Simply because Google is king of all the search engines. There are billions of purchases Google has made daily and thus, Google Ads shows your business right in front when someone is searching for a product or service that you sell. Like having a top-tier high street premise on the busiest interweb shopping mall in months.
## Your Google Ads Toolkit
Let the rubber Hit the road. There are a few of the top tools inside Google Ads that will allow you to create highly successful campaigns. These tools are not just limited to this but have opened doors for us in doing advertisements of our creativity.
## What Are The Key Weapons in your PPC Arsenal?
Now, let me tell you about every tool that acts as a weapon in the Google ads system.
**- Keywords:**
The Lifeforce Of A Campaign Choose searchable keywords that people would use if they were looking for your products. If used the right way, a huge goldmine of opportunities Research Tools — Google Keyword Planner.
**- Bidding:**
Where the PPC magic takes place. They bid what price they are willing to pay per click on their ad. Bidding strategies can be a bit played out, but you need to master them if you want to tame your budget and reach more often.
**- Ad Copy:**
This is where you write a convincing message that will encourage people to click. There are different ad formats in Google Ads ranging from text-based to visually appealing. Keep your ad copy clean, and brief, and focus on the service you provide for the searcher.
**- Target Audience:**
Specifications for audience targeting are accessible through Google Ads and you can target your perfect customer arrangement. Demographics, Interests, Location, and even specific devices the choice is yours. This allows your ads to be served up to those most likely to convert into real customers.
**- Landing Pages:**
We often neglect the potential of a good landing page. That is visitors come after clicking on your ad and it must be such that they convert into a lead or sales.
## Campaign Craft, The Keys to Success
So, you now have your PPC arsenal ready to go, and it's time for winning campaigns. You can win the attention battle if you follow up on these awesome worth working techniques. Check out the below, tried and true strategies.
**- Think Big, But Execute Smaller:**
Take over your entire digital world with controlled parameters. Highly focused campaign on only a few targeted keywords You slowly scale up, as you gain experience and start to optimize your Campaigns.
**- Test & Iterate:**
The beauty of PPC is that it allows you to test and iterate your present keyword strategy even in mid-campaign. Test various keywords, ad copy, and landing pages to determine which appeals most to your intended audience.
**- Analysis:**
In this you will get the idea that google Ads gives you tons of data about how well your ads are performing. Identify areas of improvement by analyzing metrics like click-through rate (CTR), conversion rate, and cost per click (CPC). According to this, you are able to become a pro at PPC.
**- Above the Click:**
The Extended Play of PPC comes in when you get the idea about PPC that it does not mean buying clicks, it means buying valuable customers.
**- Conversion Tracking:**
Measure the number of clicks that translate into sales or leads. After you have the data, find out which are the keywords and campaigns that yield the best ROI.
## The Takeaway: Be a PPC Master
This will open a source of targeted advertising at a lower-end price scale than ad networks ever could be mastered by mastering Google Ads and PPC. But with the correct information and relentless
## Conclusion: The very last click — Mastering the techniques of PPC
So, there you have it! Voilà, you have unlocked the secret of cracking the clicks with Google Ads and PPC. Bear in mind that this is just the start of your PPC story. If you test, tweak, and analyze your campaigns regularly, you become a PPC mastermind. In no time, you would start pulling hundreds of targeted traffic and would see your sales climb up higher than your expectations.
There's no shame in trying new things or adapting to the ever-changing landscape of PPC. If you are ready to put in the work and equip yourself with this critical framework, your clicks will become raving fans who consume everything you create at an unprecedented rate. Give Google Ads a go and triumph in the digital realm!
| liong |
1,868,240 | 7 Steps to Level Up Your Social Media Strategy | Our world is now getting more and more modernized with awesome technology. Have you ever thought that... | 0 | 2024-05-29T00:15:47 | https://dev.to/liong/7-steps-to-level-up-your-social-media-strategy-29d8 | socialmedia, instagram, malaysia, kualalumpur | Our world is now getting more and more modernized with awesome technology. Have you ever thought that your boring brands need some enlightening promotion? Now all your questions about how to market and why to market are going to be answered. [Social media marketing](https://ithubtechnologies.com/social-media-marketing-malaysia/?utm_source=dev.to&utm_campaign=socialmediamarketing&utm_id=Offpageseo+2024) has played an important role in giving an amazing transformation or change to this digital world. This has changed the way for brands to interact with their customers/ Clients. There was once an era in which people used billboards or television for advertisements for their brands and this was one-way communication. In this blog, you'll learn the way of doing this marketing in a more authentic and right manner.
## What is Social Media Marketing?
When you are using social media platforms like Facebook, Twitter, Instagram, and WhatsApp to give a promotion to your business is known as Social Media Marketing.
There are some of the benefits of marketing mentioned in the following:
**- Making shareable Content:**
This includes the creation of something like fun videos, images, or anything like that that you can easily share online. Sometimes, such things like this get noticed by people and they may share it with their friends.
**- Building Connection:**
When you are trying to build connections and interact with people by following them Afterwards, the follow-up leads to starting conversations, answering their questions, and doing updates. This will automatically allow you to meet with more people and have a big social circle.
**- Paid Ads:**
Running paid ads is all about paying your social media platform to boost up visibility like more likes, follows up, and features you post to more people. This would allow more people to see you.
**- Tracking Scheme:**
Social media has another feature known as tracking which gives you the analysis of how many likes, shares, or comments are given to your post. This generation has a craze to achieve all this.
**- Highlight your brand:**
Your brand is highlighted by social media because when more people see your brand post, they share with their friends, more likes, and more followers, all this means more visibility for your brand.
## Steps needed for Doing Social Media marketing:
## Step 1: Understanding Your Audience
Before getting started with the marketing you need to first craft the post. Firstly you need to do thorough research on the content and what kind of content-related post you have to create. This content research will help you to get an idea of the demographics like pictures or images, interests, and online behavior. Now imagine that you have a donut shop and you are targeting health-conscious people through the posts. Instagram is such an awesome platform that it consists of amazing visuals that can beautifully click and showcase your donuts and healthy treats and also share recipes. On the other side, there is Facebook which is very important for providing you with a financial services company that aims to connect with experts seeking investment advice.
## Step 2: Defining Your Goals
Do you want to boost your brand posts or do you want to increase the visibility of your brand? If you want to increase your brand awareness and drive more traffic to your social media account of your brand, generate leads, or double the sales then you must set clear goals. This spirit will automatically make your brand increase up to 20 percent within a quarter. Then your action comes in to light up your brand through spark conversations and get your brand name out there.
## Step 3: Building a Content Strategy
When you have the needs and requirements of your audience in mind, you will be able to make an amazing content strategy. When we talk about content strategy, it makes the best content and this is only possible if we focus on creating high-quality, informative, and interesting content in the audience's eyes. You should also add funny videos or shorts/clips to increase visibility and also add interactive polls. All such things altogether will help you to make your content more engaging and awesome which will keep traffic on your social media platform all the time.
## Step 4: Make your profiles represent your brand
Treat your social media pages like your online storefront. Craft short bios that clearly say what your brand is about and why people should care. You must start using high-quality visuals, include profile photos or pictures, add cover photos and even reflect your brand.
## Step 5: Mastering the Art of Engagement
The social media platform is a two-way system. You have to encourage and stay interacting with your people through messages or comments. Reply to comments and messages quickly so people feel part of a community. Keep interactions going by asking questions, running contests, and doing live videos. Reacting to any complaints shows you care about customer service and can turn angry folks into loyal fans. You must reply to negative feedback to remove any misunderstandings that will automatically lead to making a loyal customer.
## Step 6: Utilizing Analytics
The social media platform has these insights that will help you to get an idea about your strategy. You must analyze metrics like engagement reach that you have on a post, likes, and clicks. Tracking such an analysis of your post on social media will make sure that you can perform better in creating content in the future. As a result more successful businesses with more successful social media marketing.
## Step 7: Staying Ahead of the Curve
Social media is an awesome platform that is always with something new as this may involve new trends. The most successful brands are those that act according to adapting themselves to the trends and staying beyond the curve. This makes them limitless and successful in marketing.
## Conclusion
According to the above-highlighted points, it can be concluded that social media marketing offers a wide variety of powerful tools for brands. These tools are so powerful that they play a major role in promoting the brand to build up a connection with the audience, building brand awareness and loyalty, and getting more sales done. This has also given the basic idea that when we understand and analyze our audience, we will be sure of what kind of product we have to take according to our audience's liking. Additionally, your brand's online social platform will be more visible which will automatically turn your followers into loyal customers.
| liong |
1,870,044 | What I missed about Ruby | I'm back in Ruby on Rails land after two years using only Node/TS. And I'm thrilled to be back! I... | 0 | 2024-06-07T18:23:18 | https://jonathanyeong.com/what-i-missed-about-ruby/ | ruby | ---
title: What I missed about Ruby
published: true
date: 2024-05-29 00:00:00 UTC
tags: ruby
canonical_url: https://jonathanyeong.com/what-i-missed-about-ruby/
---
I'm back in Ruby on Rails land after two years using only Node/TS. And I'm thrilled to be back! I feel like I missed so much progress with Rails 7 over the last 2 years. But now that I'm back, I can finally use all the things I missed. Here's all the things that I took for granted before my break:
- Convention is enforced in Rails. Organization is much easier in a rails project, and I'm able to hop into any Rails project and find my way around.
- _Some_ magic is nice. Such as auto-loading files!
- Rails console!!! Omg being able to run code snippets is amazing. I downloaded [RunJS](https://runjs.app/) to be able to achieve the same thing. But it's not a replacement for being able to play around with the data along with your code.
- Mocking with RSpec is way easier than Jest. In Node/TS, we used dependency injection to be able to mock classes and methods. But it was annoying to use dependency injection when it was only used in testing. _Please let me know if there's a better way to do it_.
- Having Rails routes to get an overview of all the entry points to the app is so underrated.
One thing that I took away from the last two years, is typing. I'm not going to lie. I like it. It's nice to be able to hover over an object and know what fields exist in it. I would love with Ruby to be able to hover over a hash and see all the keys that exist. I added [Sorbet](https://sorbet.org/) and [RBS](https://github.com/ruby/rbs) to my things to learn list. | jonoyeong |
1,869,653 | Using the GOV.UK Design System with Laravel | I recently worked on a project using the GOV.UK Design System with a Laravel project. The GOV.UK... | 0 | 2024-06-12T16:32:59 | https://www.csrhymes.com/2024/05/29/using-gov-uk-design-system-with-laravel.html | laravel, webdev, frontend | ---
title: Using the GOV.UK Design System with Laravel
published: true
date: 2024-05-29 00:00:00 UTC
tags: Laravel,WebDev,Frontend
canonical_url: https://www.csrhymes.com/2024/05/29/using-gov-uk-design-system-with-laravel.html
cover_image: https://www.csrhymes.com/img/london.jpg
---
I recently worked on a project using the GOV.UK Design System with a Laravel project. The GOV.UK frontend provides layouts and accessible HTML components with their own CSS and JavaScript. The two packages worked really well together, so I thought I would provide a quick example of how to get it setup.
## Things to consider
Before you use the GOV.UK frontend you must consider the following:
> You’re welcome to use the template even if your service isn’t considered part of GOV.UK, but your site or service must not:
>
> - identify itself as being part of GOV.UK
> - use the crown or GOV.UK logotype in the header
> - use the GDS Transport typeface
> - suggest that it’s an official UK government website if it’s not
[GOV UK Frontend Readme](https://github.com/alphagov/govuk-frontend-docs/blob/main/README.md)
## Creating a new project
First we create a new Laravel project, let’s call it `gov-uk-laravel-demo`:
```
composer create-project laravel/laravel gov-uk-laravel-demo
```
## Install npm dependencies
Then we change into the directory and install our npm dependencies.
```
cd gov-uk-laravel-demo
npm install
npm install govuk-frontend --save
npm install sass vite-plugin-static-copy —dev
```
## Importing the styles
Rename `resources/css/app.css` to `resources/scss/app.scss` and add the following content.
```scss
$govuk-assets-path: "/build/assets/";
@import "node_modules/govuk-frontend/dist/govuk/all";
```
The sass variable is updating the default path from `/assets/` as we are using vite, which puts everything inside a `build` folder.
## Importing the JavaScript
In `resources/js/app.js`, update to the following to initialise the govuk-frontend JavaScript.
```js
import "./bootstrap";
import { initAll } from "govuk-frontend";
initAll();
```
## Configuring vite and building
Update vite.config.js to build our scss files (previously css) and [copy the fonts and images](https://frontend.design-system.service.gov.uk/import-font-and-images-assets/#copy-the-font-and-image-files-into-your-application) to the `public/build/assets` folder using the viteStaticCopy plugin.
```js
import { defineConfig } from "vite";
import laravel from "laravel-vite-plugin";
import { viteStaticCopy } from "vite-plugin-static-copy";
export default defineConfig({
plugins: [
laravel({
input: ["resources/scss/app.scss", "resources/js/app.js"],
refresh: true,
}),
viteStaticCopy({
targets: [
{
src: "node_modules/govuk-frontend/dist/govuk/assets/",
dest: "",
},
],
}),
],
});
```
Then run `npm run build` to build the css, js and copy the relevant assets.
## Creating a page
Copy and paste the [default page template HTML](https://design-system.service.gov.uk/styles/page-template/) from the documentation page into the `welcome.blade.php` file.
Remove the script tags at the bottom of the page
```html
<script type="module" src="/javascripts/govuk-frontend.min.js"></script>
<script type="module">
import { initAll } from "/javascripts/govuk-frontend.min.js";
initAll();
</script>
```
Then replace these two lines in the head:
```html
<link rel="manifest" href="/assets/manifest.json" />
<link rel="stylesheet" href="/stylesheets/govuk-frontend.min.css" />
```
With this:
```html
@vite(['resources/scss/app.scss', 'resources/js/app.js'])
```
Then run php artisan serve and head to `http://localhost:8000` to view our new page.
## What next
From here you can start building your app by creating a layout blade component that other pages can reuse, then create reusable components following the HTML examples in the [GOV.UK Design System](https://design-system.service.gov.uk/components/).
[Photo](https://stocksnap.io/photo/bigben-night-LWRWOL8KSV) by [NegativeSpace](https://stocksnap.io/author/negativespace) on [StockSnap](https://stocksnap.io) | chrisrhymes |
1,812,677 | Welcome Thread - v278 | Leave a comment below to introduce yourself! You can talk about what brought you here, what... | 0 | 2024-05-29T00:00:00 | https://dev.to/devteam/welcome-thread-v278-2jha | welcome | ---
published_at : 2024-05-29 00:00 +0000
---
---
1. Leave a comment below to introduce yourself! You can talk about what brought you here, what you're learning, or just a fun fact about yourself.
2. Reply to someone's comment, either with a question or just a hello. 👋
3. Elevate your writing skills on DEV using our [Best Practices](https://dev.to/devteam/best-practices-for-writing-on-dev-creating-a-series-2bgj) series! | sloan |
1,868,239 | Yashirin indekserga kirish | Bazida 0 indekslangan collectionlarni ohirgi qiymatiga murojat qilishda ko'pchiligimiz yo'l... | 0 | 2024-05-28T23:58:46 | https://dev.to/farkhadk/obektni-initsializatorlarida-yashirin-indekserga-kirish-17i7 | csharp, news, featur, dotnet | Bazida [0 indekslangan](https://dev.to/farkhadk/nol-indekslangan-toplamlar-6c3) collectionlarni ohirgi qiymatiga murojat qilishda ko'pchiligimiz yo'l qo'yadigon oddiy bir xatolik bor `array[array.Length]`, va hozirham oramizda bu yerda xatolikni payqamaganlarxam bo'lishi mumkin. Bu error esa o'z vaqtida judaham kichik, payqa qolish qiyin va asabga o'ynaydigon hatoliklardan deb xisoblayman (`array[array.Length - 1]` to'g'ri varianti).
C# 13-chi versiyasida **Implicit Index Access** -> **yashirincha indeksga murojat** degan feature qo'shildi. Bu feature ni ishlatishda bizga **_caret_**-`^` operatori yordam beradi.
Misol:
```
int[] nums = new int[5] { 1, 2, 3, 4, 5 };
Conosle.WriteLine(nums[^1]);
// output -> 5
```
Implicit Index Access feature sini funksionalligi faqatgina ohirgi elementga murojat qilish bilan cheklanib qolmaydi. Bu xususiyat har-qanday `0` indekslangan collection ni oxiridan boshlab har bir qiymatiga murojat qilishda yordam beradi.
Misol:
```
int[] nums = [1, 2, 3, 4, 5];
for(int i = 1; i <= nums.Length; i++)
Console.Write($"{nums[^i]} ");
// output -> 5 4 3 2 1
```
Etibor berish kerak bolga joyi bu funksional `^1`(birdan) boshlanadi, bu degani arrayimizni uzunligi `n` bolsa, oxirgi qiymatning indexi `n-1` ga teng, shu bilan birgalikda `^1 = n-1` yaniy eng oxirgi indeksga ko'rsatib turadi, `^2` esa oxirgidan bitta oldingi(^2 = n-2) indeksga teng, va hokazo.
Arrayni teskari o'girish misoliga boshqacharoq qilib ishlatamiz
Misol:
```
int[] nums = [1, 2, 3, 4, 5];
foreach (var item in ReverseArray(nums))
Console.Write($"{item} ");
int[] ReverseArray(int[] array)
{
int[] reversed = new int[array.Length];
for(int i = 0; i < array.Length; i++) <---
reversed[i] = array[^(i+1)]; <---
return reversed;
}
// output -> 5 4 3 2 1
```
Bu safargi ko'dimizda `i` 1 ga emas 0 ga teng va array ni oxiridan murojatni boshlash uchun esa `array[^(i+1)]` ishlatildi.
> Bundan tashqari bu feature ni harkim o'z tassavuri yetganicha va albatta C# kompilyatori ruhsat berganicha ishlata oladi. @wahidustoz aytganlaridek "Sky is the limit". | farkhadk |
1,867,207 | Nol indekslangan to'plamlar | C# da bir nechta to'plam(collection type) turlari nol indekslangan, ya'ni ularning qiymatiga indeks 0... | 0 | 2024-05-28T23:57:32 | https://dev.to/farkhadk/nol-indekslangan-toplamlar-6c3 | csharp, dotnet, index | C# da bir nechta to'plam(collection type) turlari nol indekslangan, ya'ni ularning qiymatiga indeks `0` dan boshlab murojat qilish mumkin. Yani arrayni yoki listni 0-chi indeksga murojat qilsak, bizga 1-chi element(qiymati)ni qaytaradi.
Misol:
```
var nums = new int[]{1,2,3,4,5};
Console.WriteLine(nums[0]);
// output --> 1
```
> C# da nol indeksli to'plamlar ro'yxatidan bir shingil: `array`, `List<T>`, `ArrayList` va hokazolar kiradi.
Yuqorida ko'rganimizdek, bizda `nums` nomi bilan, 1 dan 5 gacha bolgan sonlar arrayi berilgan, va biz konsolga birinchi elementi(qiymatini)ni chiqarishimiz uchun `nums[0]` deb murojat qildik. Keyingi elementiga murojat qilish uchun esa `nums[1]` deyish kifoya, va shu zaynda davom etaveradi.
`0` indeksli toplamlarni ohirgi elementiga(umumiy elementlar soni `n` ga teng bolsa) `nums[n-1]` qilib murojat qilinadi. Nima uchun aynan `n-1`?!
Buning sababi, yuqoridagi kodga yuzlansak, u yerda qiymatlarning umumiy soni 5 ga teng(n = 5), indeks bo'ylab sanalganda esa 4 ga teng (0,1,2,3,4). Agar `nums[5]` qilsak, indeks bo'yicha sanalganda 5-chi indeks 6-chi elementga to'g'ri keladi, bizda esa umumiy 5ta qiymatlar bor.
> indekslar -> 0 | 1 | 2 | 3 | 4
> qiymatlar-> 1 | 2 | 3 | 4 | 5
Misol:
```
var nums = new int[]{1,2,3,4,5};
int n = nums.Length; // n = 5,
Console.WriteLine(nums[n-1]);
// output --> 5
```
Bu kodda `nums.Length`(length -> uzunligi) bizga `n` yaniy qiymatlar sonini topishda yordam beradi. Yuqoridagi kodimizni yanda qisqartirsak boladi.
Misol:
```
var nums = new int[]{1,2,3,4,5};
Console.WriteLine(nums[nums.Length - 1]);
// output --> 5
```
Bazida shunday holatlar boladiki ohirgi elementga murojat qilyotkanimizda `nums[nums.Length]` **-1** ni qo'shib ketish yoddan chiqishi mumkin, bu esa o'z vaqtida hatolikga olib keladi.
C# 13-chi versiyasidan boshlab yangi feature(xususiyat) kirib keldi uning nomini
**_Implicit index access_** -> **_Indeksga yashirin kirish_** deb nomlashdi, va bu xususiyatni ishlatish uchun esa `^`(caret -> karet) aperatori bilan amalga oshirish mumkin. Bu feature xaqida ushbu -> [link](https://dev.to/farkhadk/obektni-initsializatorlarida-yashirin-indekserga-kirish-17i7) postimda tanishib chiqsangiz boladi. | farkhadk |
1,868,238 | E-commerce: A gateway to your successful business | The Internet is like a key that has provided so many ways for us to modernize in every way. It has... | 0 | 2024-05-28T23:57:00 | https://dev.to/liong/e-commerce-a-gateway-to-your-successful-business-3ii | businesss, malaysia, kualalumpur, ecommerce |
The Internet is like a key that has provided so many ways for us to modernize in every way. It has reduced our workload, provided more interaction with different people globally, and much more. The Internet has provided us with unlimited opportunities that have made a way of providing ease to our lives. Our business is not just limited now because it has gained attention at the world level. The e-commerce world has provided a realm of easy, accessible, worthwhile shopping in just one click. This is not only the way to shop but also the most chaos-free shopping. In this blog, you are going to achieve all the basic hacks of doing e-commerce shopping, the benefits of e-commerce, and much more. This world's future lies in the hands of e-commerce.
## The Rise of E-commerce Giants and Niche Players
The top companies like Amazon and eBay were the ones that marked the early days of e-commerce. Amazon and eBay, are known to be the top players that introduced a way of new shopping experience. These top players also offered a huge selection of products with different niches or roles. In this century, [e-commerce](https://ithubtechnologies.com/ecommerce-online-retailer/?utm_source=dev.to&utm_campaign=e-commerce&utm_id=Offpageseo+2024) has gone so far that it has crossed these players. The niche or role of online stores has gone far beyond specializing itself in everything from handmade jewelry to original organic stuff of groceries. It also depends upon the needs and requirements of customers. Their interests and preferences are the main ones that cater to the online stores. The opening of online stores has been boosted due to many reasons. The more the use of smartphones the more internet speed and internet are needed, and last, this has caused a lot of trafficking in online stores for online shopping. The online shopping scheme has given so much to the customers coming up online and even online platforms like social media (Facebook, Instagram, Snapchat, WhatsApp) have created powerful businesses. These powerful online businesses can easily interact with their customers directly through status, stories, and DMs(Direct Messages) and also showcase their products easily.
## The Convenience Factor: Shopping from Anywhere, Anytime
When we talk about the convenience factor, there are the most important benefits of e-commerce. This gives us the idea of e-commerce as a convenience. The [physical stores in the market are way more facing difficulties and fuss while the e-commerce, which is the 24/7 online stores are opened. This kind of online store allows you to easily buy products from your comfort zone with just one click on the go. This kind of flexibility is very good for busy people who do not have much time to do anything for themselves but they can do shopping quickly and also for the people who are working in remote locations.
E-commerce has played an awesome role in the expanding or building up of business in the online platform. Not only this but e-commerce has provided a huge range of product selection as compared to the physical stores with physical space. Online retailers are not limited by physical space as it allows the stock of goods of huge inventory or products, this also includes niche or hard-to-find items. This automatically gives us the ability to a very broad range of options and it increases the same type of product that you are looking for.
## Competitive Prices and Comparative Shopping Made Easy
The competitive prices give us the idea that price is considered to be the main thing whenever you are making any purchasing decisions. These competitive prices are offered by the e-commerce platforms for many reasons. The lower the prices of the products of the online stores the more savings are passed onto the customers as compared to physical stores. One more thing is that online shopping has made it easier for us to compare the prices throughout different stores and that will make sure we save money by focusing on getting the best deals. There are many e-commerce stores or platforms that provide their regular customers or new ones with discount codes, vouchers, sales, and loyalty programs to get more attention to their online stores. These are different kinds of ways that ensure that our e-commerce online store is expanded, attractive, and becomes known in the eyes of the online audience.
## E-commerce: The Trends and Future
E-commerce has been the only way of making new trends and creations. This kind of e-commerce has many new technologies and trends that are making a way of shaping the future. This also includes some of the exciting and impressive technologies and trends that are shaping the future of e-commerce. Here are some of the descriptions of exciting g technologies like the following:
1.**Artificial Intelligence (AI):** From AI we can get the idea of artificial intelligence. Artificial intelligence through its unique technology has provided e-commerce businesses with special features like recommendation schemes, which provide the recommended products to customers according to their likings and needs.
2.**Augmented Reality (AR) and Virtual Reality (VR):** These are those types of technologies that can boost modernizing the online shopping system. They can make the way of getting the offline and online shopping experience together.
3.**Voice Commerce:** Voice commerce includes voice artists like Alexa and Google Assistant. These are the ones that make it easier for us to shop by the command of our voice.
4.**Social Commerce:** This includes that people can purchase the products or goods according to their liking directly from the e-commerce platform.
## Conclusion: E-commerce - A Boon for Customers and Companies
According to the above-highlighted points, it can be concluded that E-commerce has unexpectedly changed the way we used to shop as it has opened up new possibilities. This online shop platform includes many features like new offers, competitive prices, and much more. If you think from the business point of view, e-commerce has opened up doors. This has opened up doors for businesses to reach huge audiences and expand the business on local to national levels.
| liong |
1,868,221 | [Game of Purpose] Day 10 | Today I played around with Foliage. I learned about various settings for a mesh in Foliage Mode,... | 27,434 | 2024-05-28T23:34:41 | https://dev.to/humberd/game-of-purpose-day-10-673 | gamedev | Today I played around with Foliage.
I learned about various settings for a mesh in Foliage Mode, such as:
* Align to Normal:
* checked - good for grass, the grass is rotated to the angle of the slope
* unchecked - good for trees, not rotated despite being on a slope
* Scaling
* Density, etc.
I had a problem with Foliage wind animation. For some reason the Foliage has different wind depending on where it's placed. The first trees have normal animation, but the next placed far away have their wind animation way too exaggerated.
{% youtube https://youtu.be/2dG5KRrKp6I %} | humberd |
1,868,236 | I've been trying Haruki Murakami's routine (Wake up at 4 am to get 6 hours of deep work) | Hi everyone, I quit my job last year to build my own online business. The problem is that I usually... | 0 | 2024-05-28T23:30:20 | https://dev.to/buditanrim/ive-been-trying-haruki-murakamis-routine-wake-up-at-4-am-to-get-6-hours-of-deep-work-39hk | productivity, learning | Hi everyone,
I quit my job last year to build my own online business. The problem is that I usually work from 9 am to 4 pm. I feel I have no life :D
Since I work for myself, I need to push myself and work hard. However, I end up feeling tired and unable to exercise and do other things.
Then I stumbled upon Haruki Murakami’s schedule.
He wakes up at 4 am and does deep work for 8 hours.
I've tried it for a week. It's been amazing. After lunch, I can stop thinking about work. If needed, I do another 2 focus hours in the evening.
My schedule looks like this:
- 4 am: wake up
- 4.30 am - 12 am: deep work,
- Use Pomodoro 1 hour focus and 10 min break
- 12 pm - 1 pm: lunch and break
- 2 pm: exercise
- 3 pm - 6 pm: read, walk, chill
- 8 pm: go to bed and try to sleep
My favorite thing is that I can have life outside of my work.
I wonder if anyone has done this and wants to exchange some suggestions. Or, if you are considering this routine, feel free to ask questions.
If you're interested in building the same routine. You can join my live stream session: https://youtube.com/live/slwvDGYwXBQ?feature=share | buditanrim |
1,868,235 | [Programming, Opinion] Should you read the GoF(design pattern) book? | image source: https://www.irasutoya.com/2021/01/blog-post_11.html (A sleeping woman in front of a... | 0 | 2024-05-28T23:29:46 | https://dev.to/uponthesky/programming-opinion-should-you-read-the-gofdesign-pattern-book-2cef | books, productivity, programming | *image source: https://www.irasutoya.com/2021/01/blog-post_11.html*
(A sleeping woman in front of a PC)
## TL; DR
- I won’t recommend reading it without much experience in programming - Have experience of real-world problems first
- Use it as a reference, especially when building a complex system on your own
## Introduction
In software engineering world, there are several books that allegedly called **MUST-READ**. There are millions of such, but one of the noticeable books is the ["Design Patterns" book a.k.a. the GoF(Gang of Four) book](https://www.amazon.com/Design-Patterns-Elements-Reusable-Object-Oriented/dp/0201633612). Regardless of its age, this book is being mentioned frequently on the Internet even in 2024 as of this writing. To introduce it shortly, it is considered as a "bible" for designing objected-oriented applications, with examples in C++ and SmallTalk. Some even say you **MUST READ** it before becoming a senior level engineer.
Attracted by so many compliments on this book, I read through this book as well, checking every pattern introduced. But after finishing the book and working on a real-world product, I now doubt about whether this book is really something you **MUST READ**. Has this book helped me writing better code, or led to making better design and decision in software development in general?
**DISCLAIMER**: I am not a senior engineer with 10+ YOE, so my opinion is highly skewed towards the standpoint of junior software engineers of YOE less than 5 years. I highly value different opinions on this book as well.
## Why I won’t recommend the GoF book for beginners
One thing I want to speak up is that this book is not for beginners in programming and software engineering. There are several reasons I can think up but here are two main things:
### 1. You might focus too much on the patterns themselves
You may have heard these seemingly "professional" jargons from a lot of documentations, such as *Singleton*, *Facade*, *Factory*, *Strategy*, etc. These are the patterns introduced in the GoF book. If you don’t have that much experience in software engineering, you may feel that you have to read the book to understand these concepts thoroughly.
However, personally I think this is a bad approach to software engineering in general. Being exposed to the patterns first may obscure the practical intention of the patterns themselves - organize the solution in structured ways to solve designing software problems. Unless you face and touch the problems first, you won’t fully grasp why you use those patterns in the first place.
Conversely, you may concentrate on memorizing the patterns and their code examples. But do you actually understand why the singleton pattern is used here and not there, and why the prototype pattern is not discussed in languages like Python? These insights are only learnable from real experiences, not from the book.
Basically, we only need knowledge that we use. There should be several patterns that are implicitly used in your daily work, but even so, you don’t have to memorize the patterns themselves. If your hands know them, then you know them.
### 2. The code examples are abstract and you can’t run them
The other reason is because of the code examples introduced in the book. The code itself is not bad, although it is rather old(even before C++11). The problem of the code examples is that it is abstract and not used in a real application example.
Of course, the book introduces a real application example before the catalogs, in chapter 1 and 2. However, in my opinion it is too short to grasp each of the patterns. Also, in 2024, we need examples that we are more familiar with, such as web, mobile, and machine learning applications.
When it comes to the examples in the individual patterns, they are not a part of an actually running application, but a collection of mock classes and functions in C++. Thus, even if you read the code, you won’t really understand how it would be implemented in a real application. And the problem is, you only learn from concrete code that actually runs and gives expected results.
## How I would approach this book in the second read
But I am not saying you should not read this book. Rather, I think it would be good to read after having experienced in several software projects so that you can relate your own experience to the patterns from the book. If I would read this book again in the future, I would take the following approaches:
### 1. Looking up the list of the patterns only when the names of the patterns come up from documentations
Some software authors love to quote the patterns introduced in this book. Therefore, unfortunately, you have to know what the patterns do that the author of a documentation mentions(for example, [Rust's THE BOOK directly discuss the state pattern in a single chapter](https://doc.rust-lang.org/book/ch17-03-oo-design-patterns.html)). However, it doesn’t mean that you have to know every single design pattern in GoF. Only after you bump into the jargons, then you look up the book.
Read the general introduction of the pattern from the book, then read the documentation. Compare the code examples in the book with the one in the documentation. Write your own code according to the documentation and understand why the author mentions those specific patterns.
For example, [LlamaIndex framework uses the singleton pattern for configuration](https://docs.llamaindex.ai/en/stable/module_guides/supporting_modules/settings/). Why did the authors use this pattern for configuration, and why not something else? You many find useful insights from the GoF book about this design decision.
### 2. Consulting the designs when designing a complex system on your own
Sometimes, we may create an application that is totally brand new - not using highly opinionated frameworks written by others but your own one. It is absolutely necessary for you to design the application from scratch, and you need to consider various options.
In this case, I think it would be good to brush up on your knowledge on design patterns. The GoF book already contains a lot of patterns with clear explanations in diagrams, so it is a good way to replenish your options. Especially, the design patterns in the book are for managing a complex system efficiently, thus you would benefit from skimming through the list of the patterns.
## Conclusion
Against the hype that “You should read the GoF book”, I strongly claimed here in this article that you should face the real-world problems first and use the book as a helpful reference. There is no such book as **MUST READ** - you **USE** books for your own good and efficiency. | uponthesky |
1,868,234 | Developer diary #11. Cheating with AI. | Now is the time of AI hype. It helps to as solve problems, find optimal solutions, generate fun image... | 0 | 2024-05-28T23:26:44 | https://dev.to/kiolk/developer-diary-11-cheating-with-ai-2k0l | programming, ai, java, android | Now is the time of AI hype. It helps to as solve problems, find optimal solutions, generate fun image or music. One question disturb me all this time. Where is the border between useful of AI and cheating.
It is useful when I try to understand a piece of code, it provides detailed explanation. I use generated code to solve a problem if I am not experienced in some languages, but I always read code carefully and try to understand how it works. I don't want to use something that I cannot understand.
I avoid use AI to generate text for presentation, feedback on my colleagues, message in chat, CV or cover latter and more other cases. I feel it is not so natural, because text reflect our person. With AI we try to create an ideal version of ourselves. Of Course, with LLM I can do this work in 10 times faster, but It hides my identity. It looks like use computer when you play in online chess, it is clear cheating.
It will be interesting to know of your borders of using AI. | kiolk |
1,868,233 | Ruby on Rails está muerto, fin. | No, es broma, ni cerca de estar muerto, a pesar de que todos los años aparece alguien sensacionalista... | 0 | 2024-05-28T23:23:54 | https://dev.to/paulmarclay/ruby-on-rails-esta-muerto-fin-2cc | ruby, rails, python, development | No, es broma, ni cerca de estar muerto, a pesar de que todos los años aparece alguien sensacionalista matando a Ruby, Rails, PHP y otros lenguajes o frameworks.
> Me encanta ROR, no es mi lenguaje materno, pero casi.
Cada vez que tengo una idea, la pienso en Ruby, en Ruby on Rails, me resulta mucho más fácil, tranquilamente se puede hacer un MVP en un día, si uno sabe a lo que quiere llegar.
Usando ROR, he trabajado en proyectos pequeños y grandes, algunos demasiado grandes, pero Rails hace que se sienta natural cada movimiento que das.
Ruby y Rails llevan al extremo el paradigma de "Convention Over Configuration" hasta el punto de que pensar saltarselo suene a blasfemia.
**Todo hermoso, pero se acerca un problema**.
Al pensar en hacer todo lo que conlleva a un proyecto utilizando sólo Rails, podemos pecar de integridad, y es lo que me pasó.
¿Qué quiero decir con eso?, que estamos utilizando un framework y sus buenas prácticas, pero las buenas prácticas deben organizarnos, no limitarnos.
Por ejemplo, me ha pasado tener que hacer consultas SQL complejas y, para no ser hereje, obviamente las hacía utilizando las buenas prácticas y modelos de ActiveRecord, a veces resultando queries costosas, difíciles de digerir para SQL mismo, ah, pero yo usaba buenas prácticas del framework.
Según mis pensamientos, nada debía tocar la base de datos si no era a través de un modelo de datos, su "updated_at" debía reflejar la fecha de última actualización de lo que se tocara, y ni hablar de que algo externo al proyecto accediera a ella!.
**¿A dónde quería llegar con todo esto?**, justo a este punto, un framework, por más poderoso, grande y versátil que sea, no deja de ser eso, un framework, un marco de trabajo, no restrictivo, si organizativo.
Utilizar un framework no quiere decir que tenemos que estrictamente limitarnos a sus buenas prácticas (ya veo un aluvión de comentarios de fanáticos de las buenas prácticas), simplemente debemos utilizarlas siempre y cuando nos sea posible, tomar lo que necesitemos y para el resto, usar nuestro ingenio de desarrolladores.
Este último tiempo trabajando con scrapers para obtener precios de productos en [RantiQ](https://rantiq.com), indexando noticias y menciones a marcas, organizaciones y personas en [Dolem Labs](https://dolemlabs.com.ar), etc.; decidí romper con el paradigma que tenía casi impreso en mi hardware, a pesar de haber realizado las tareas con mi framework preferido, decidí darle una oportunidad a otros métodos, otros lenguajes incluso.
Ahora los crawlers corren sobre Python y sin un framework de guía, al menos no un framework de verdad, organizo mis propios modelos de datos cuando lo necesito, corro queries costosas que hacen "cosas locas" cuando lo necesito, analizando miles de páginas web por día y una vez más rompiendo mis estándares, no en un solo lenguaje, no todo bajo la tutela de un framework.
Y si, los scripts python tocan la base de datos, insertan miles de registros, actualizan otros cientos e indexan información para que a Rails le resulte más sencillo hacer su trabajo.
Y si, las cosas van mejor, no quiero entrar en el tema de Monolito vs Micro Servicios, ya está muy gastado. Vas a ver que al cargar un script Python (no porque sea Python, es porque no hay un framework) para realizar la tarea de scrapeo, sin necesidad de cargar todo un framework para una simple tarea, todo fluyó mucho más rápido, con mayor performance a la hora de hacer SQL queries libremente. También para el front fue todo más fácil y barato, ya que algunos scripts "pre mastican" la información y la dejan lista para consumir.
**¿Hay que tener cuidado?**, si, hay que tener cuidado, hay que conocer el framework como para no corromper datos y que después todo explote cuando se lo quiera consumir.
Ahora tengo tablas de las que Ruby on Rails no está enterado de que existen, tablas que se utilizan para hacer procesos costosos de indexación, ROR no necesita saber de eso, y ya no me siento culpable :)
En fin, no estoy diciendo que hagan cochinadas, estoy diciendo que al igual que Scrum es un marco de trabajo en el cual debemos basarnos para hacer un desarrollo de manera ágil, no es algo que nos limite para nada, las ceremonias que tiene (muchas para mi gusto) no suelen ser obligatorias, uno va tomando lo que necesita para que el proyecto fluya.
Volviendo al código, hay cosas que pueden ser mucho más performantes en otros lenguajes y/o frameworks que el que estás usando de base, vale la pena evaluarlo y sacarse la duda.
**¿Es siempre recomendable hacer esto?**
No, en general es recomendable atenerse a las buenas prácticas del lenguaje/framework que estés usando, más si es una startup en sus primeros pasos. Puede ser muy costoso mantener un proyecto con diferentes lenguajes y frameworks, sin mencionar el conocimiento de la lógica de ejecución de los mismos, y más aún, si hay scripts corriendo en diferentes servidores, puede llegar a ser un dolor de cabeza.
Y como para cerrar, experimenten, no se cierren a una sola manera de hacer las cosas.
Un saludo.
Paul.
| paulmarclay |
1,868,228 | Issue 46 of AWS Cloud Security Weekly | (This is just the highlight of Issue 46 of AWS Cloud Security weekly @... | 0 | 2024-05-28T23:16:08 | https://aws-cloudsec.com/p/issue-46 | (This is just the highlight of Issue 46 of AWS Cloud Security weekly @ https://aws-cloudsec.com/p/issue-46 << Subscribe to receive the full version in your inbox weekly).
**What happened in AWS CloudSecurity & CyberSecurity last week May 22-May 28, 2024?**
- AWS Billing and Cost Management console now offers a streamlined, console-based migration process for policies with retired IAM actions (aws-portal). Customers who have not yet transitioned to fine-grained IAM actions can initiate this process by selecting the Update IAM Policies recommended action on the Billing and Cost Management home page. This feature identifies affected policies, recommends equivalent new actions to maintain current access, provides testing options, and completes the migration of all affected policies across the organization.
- AWS IAM now supports signing AWS API requests with the Sigv4A encryption algorithm using session tokens issued in the AWS GovCloud (US-West) Region. By using the Sigv4A algorithm to cryptographically sign an AWS request, you can send the request to service endpoints in any of the AWS GovCloud (US) Regions.
If your account's workloads or callers need to sign AWS requests with Sigv4A, or if you plan to use an AWS feature that requires it, configure the AWS Security Token Service (STS) endpoint in the AWS GovCloud (US-West) Region to issue session tokens that support the Sigv4A algorithm. This configuration can be done via the AWS IAM Console or by calling the AWS IAM SetSecurityTokenServicePreferences API. These session tokens are larger in size, similar to those issued by the STS endpoint in the AWS GovCloud (US-East) Region, which already supports Sigv4A.
**Trending on the news & advisories (Subscribe to the newsletter for details):**
- GitHub. On instances that use SAML single sign-on (SSO) authentication with the optional encrypted assertions feature, an attacker could forge a SAML response to provision and/or gain access to a user with administrator privileges.
- LastPass Is Encrypting URLs. Here’s What’s Happening.
- SEC Charges Intercontinental Exchange and Nine Affiliates Including the New York Stock Exchange with Failing to Inform the Commission of a Cyber Intrusion.
- GitLab high severity patch release. | aws-cloudsec | |
1,868,227 | CRYPTOCURRENCY RECOVERY EXPERT (CYBERPUNK PROGRAMMERS) | In the realm of financial treachery, where promises unravel into nightmares and trust is a fragile... | 0 | 2024-05-28T23:11:30 | https://dev.to/bryden_west_062fa98a3ced4/cryptocurrency-recovery-expert-cyberpunk-programmers-4mlo | cryptocurrency, recovery, experts | In the realm of financial treachery, where promises unravel into nightmares and trust is a fragile currency, the saga of Cyberpunk Programmers emerges as a beacon of redemption. Our saga unfurled innocuously, as we ventured into the world of forex trading, entrusting our collective investments of $70,000 to an ostensibly reputable individual. Each of us, lured by the siren song of promised returns, committed $10,000 to the venture, envisioning a future of prosperity and abundance. Yet, as the ephemeral veil of trust dissolved, revealing the stark reality of deception, our collective dreams lay shattered at our feet. The individual, once regarded as a paragon of reliability, vanished into the ether, leaving behind a trail of deceit and desolation. The abrupt cessation of promised payouts and the eerie silence that pervaded his once-accessible realm spoke volumes of betrayal. In our hour of despondency, a fortuitous encounter transpired, as providence led us to the doorstep of Cyberpunk Programmers . With hearts heavy and hopes tentative, we entrusted them with the harrowing chronicle of our misfortune, laying bare the intricate nuances of our plight. Their response was a symphony of empathy and determination, resonating with a resolute commitment to rectify the injustices inflicted upon us. The ensuing journey was one fraught with peril and uncertainty. Yet, guided by the steady hand of Cyberpunk Programmers, we traversed the tempestuous seas of financial malfeasance with unwavering resolve. Armed with a panoply of forensic acumen and digital dexterity, they embarked on a relentless pursuit of justice, delving into the murky depths of cyberspace with unparalleled tenacity. The odyssey culminated in a triumph of epic proportions, as Cyberpunk Programmers successfully unmasked the elusive perpetrator and commenced the arduous restitution process. The recovery of $50,000, a testament to their indomitable spirit and unyielding dedication, heralded a dawn of vindication and renewal. Yet, beyond the tangible reclamation of funds, Cyberpunk Programmers bestowed upon us a more precious gift – the restoration of faith. In the crucible of adversity, they stood as bastions of integrity and guardians of virtue, illuminating the path toward redemption with their unwavering commitment to justice. In summation, the saga of Cyberpunk Programmers transcends the confines of mere financial restitution, embodying the quintessence of resilience and redemption in the face of adversity. To those ensnared in the tangled web of financial deceit, take solace in the knowledge that amidst the darkness, a beacon of hope awaits – Cyberpunk Programmers, the heralds of redemption in an era plagued by duplicity and despair.Simply visit their website CYBERPUNKERS DOT ORG or email CYBERPUNK @ PROGRAMMER . NET | bryden_west_062fa98a3ced4 |
1,868,225 | Mastering React: A Mindset for Component-Centric Development | React is a widely embraced front-end library renowned for crafting intuitive UI/UX experiences.... | 0 | 2024-05-28T22:55:00 | https://dev.to/chelmerrox/mastering-react-a-mindset-for-component-centric-development-d76 | react, javascript, softwareengineering, frontend | React is a widely embraced front-end library renowned for crafting intuitive UI/UX experiences. However, there is a necessary fundamental shift in mindset to have a mastery of React. As opposed to the instruction-based way of building in JavaScript, React apps have a component-based architecture. To learn & eventually build with it requires a complete change of perception.
This article will dive into how you can think & view sites in React before building in it. It draws parallels to the semantics & layout of a site and explores the advantages of adopting a component-based architecture.
## Layout of a web page
The layout of a web page is quite simple. There is a header or a navbar, followed by the other parts such as the sidebars, main sections in the middle & the footer at the bottom.
This image exemplified by [W3Schools](https://www.w3schools.com/) gives the best perspective of its layout.
With this overview, we can also view React apps in a similar model & conceptualize each segment as a component.
Deconstructing this model into components, we identify elements such as a Header or a Navbar component, a Hero section component, the second section which can be for advertisements called an advertisement component, a side-bar component & a footer component.
Thinking of components as Lego building blocks helps as each piece is fitted together through interlocking to create a cohesive whole.
Now these components can even be broken down further into smaller components and so on. We will keep it quite simple for now.
## A real-life example using W3School’s home page
Let’s take a look at the W3School’s homepage. We will focus on the main parts for brevity & in this case, will make it simpler to understand how it could be broken down into components. This means that the other sections (except for the footer) after the second section is excluded.
Clearly we see that there are 5 main components — a header, a navbar, the hero component, the HTML markup component and the footer.
This is how the page is broken down:
As explained earlier, there can also be further breakdowns of the page into much smaller components making things much more modular & maintainable in the long run.
Take the footer for example. It can be broken down into 5 more components as seen in the image below.
This can also be done on other components such as the header or even the hero component. How you would like to break down your applications into components is entirely dependent on how you want it to be. As long as they are re-usable and fits seamlessly with the other components to reach your desired result.
## Benefits of deconstructing a site’s layout into components
There are several reasons why using components is beneficial, especially during development.
## 1. Re-usable components
Components can effortlessly be re-used across various pages or even on another site.
## 2. Separation of concerns
This is a great way to keep the problems of a component isolated from every other component. It‘s encapsulated within a particular component but not in the others.
## 3. Isolation of logic
Speaking of isolation, the logic behind these components remains within the component.
## 4. Modularity
The components are just JavaScript modules (ES6 modules). Having these modular building blocks encapsulates specific functionalities which makes it easier to maintain & test through testing frameworks such as Jest.
## 5. Easier for Maintainability
The component-based architecture gives a more structured & clear flow of how these building blocks fit together. It’s easier to maintain, refactor & debug.
Adding a new feature/component becomes even easier too.
## 6. Consistency
The architecture also provides consistency in the design & eventual behaviour of the app.
## 7. Performance Optimization
The application’s performance is optimized since we can render the parts that need to be rendered onto the UI. Ultimately, this prevents any unnecessary re-renders of components that are not used.
## 8. Scalability
The scalability of the app is more efficient as complex UI becomes more manageable once it is broken down into smaller parts.
## Summary
React empowers developers to construct robust and scalable applications. This means there is a paradigm shift in perception to a component-based approach. It is akin to compartmentalization and is a high-level abstraction.
With this altered mindset, we can easily map out what parts we need, the parts that can be re-used & the ones that need to be rendered conditionally, and so on.
Re-thinking application building in this way helps in understanding React before you will even learn it. In fact, this will also be a great introduction if you will dive into other technologies such as no-code tools that uses this conceptualization.
## 📝 Additional Resources
For further insights, refer to the [React](https://www.react.dev/) documentation to learn more about the library.
## 🔍 Connect with me!
Follow me on [X](https://x.com/chelmerrox) and [LinkedIn](https://www.linkedin.com/in/losalini-rokocakau) if you like my work and want to stay updated for more.
## 🙏🏽 Support
If you’ve found my work helpful & want to support it, you can do so [here](https://beacons.ai/chelmerrox) & it’s greatly appreciated!
| chelmerrox |
1,868,220 | The Magic of Mocking with Pester in PowerShell | PowerShell, Microsoft's task automation and configuration management framework, has revolutionized... | 0 | 2024-05-28T22:54:52 | https://dev.to/mstanojevic/the-magic-of-mocking-with-pester-in-powershell-32ol | PowerShell, Microsoft's task automation and configuration management framework, has revolutionized the way administrators and developers manage and automate their environments. Among its many powerful tools, Pester stands out as the de facto testing framework for PowerShell. One of the most compelling features of Pester is its ability to mock functions and commands. In this blog post, we'll explore how cool and powerful the mocking feature in Pester is, and why it's a game-changer for PowerShell scripting and testing.
## What is Pester?
Pester is a testing framework for PowerShell that allows you to write and run tests for your PowerShell scripts, modules, and functions. It is essential for ensuring your code is reliable, maintainable, and free of bugs. Pester supports a range of testing capabilities, from simple assertions to complex behavioral-driven development (BDD) tests.
## Why Mocking?
Mocking is a technique used in unit testing that allows you to replace real objects or functions with mock versions. This is particularly useful when you want to isolate the unit of code being tested from its dependencies. By using mocks, you can:
- Test code in isolation.
- Simulate different scenarios and edge cases.
- Avoid making real changes to the system or environment.
- Improve test performance by eliminating time-consuming operations like network calls or disk I/O.
## How to Use Mocking in Pester
Pester makes it incredibly easy to mock functions and commands. Let's dive into some examples to see just how cool this feature is.
### Basic Mocking Example
Suppose you have a function Get-Weather that fetches weather information from an external API:
```
function Get-Weather {
param (
[string]$City
)
# Imagine this calls an external API
Invoke-RestMethod -Uri "https://api.weather.com/v3/wx/conditions/current?city=$City"
}
```
To test this function without actually calling the external API, you can mock **Invoke-RestMethod** using Pester:
```
Describe "Get-Weather" {
Mock Invoke-RestMethod {
return @{
temperature = 75
condition = 'Sunny'
}
}
It "should return weather information for the given city" {
$result = Get-Weather -City "San Francisco"
$result.temperature | Should -Be 75
$result.condition | Should -Be 'Sunny'
}
}
```
In this example, **Invoke-RestMethod** is mocked to return a predefined response. This allows you to test the **Get-Weather** function without making an actual API call.
### Conditional Mocking
Sometimes you need different behaviors based on the input parameters. Pester allows you to conditionally mock responses:
```
Describe "Get-Weather" {
Mock Invoke-RestMethod -MockWith {
param ($uri)
if ($uri -like "*San Francisco*") {
return @{ temperature = 75; condition = 'Sunny' }
}
elseif ($uri -like "*New York*") {
return @{ temperature = 60; condition = 'Cloudy' }
}
}
It "should return sunny weather for San Francisco" {
$result = Get-Weather -City "San Francisco"
$result.temperature | Should -Be 75
$result.condition | Should -Be 'Sunny'
}
It "should return cloudy weather for New York" {
$result = Get-Weather -City "New York"
$result.temperature | Should -Be 60
$result.condition | Should -Be 'Cloudy'
}
}
```
This flexibility allows you to simulate different scenarios and ensure your code behaves correctly in various conditions.
### Verifying Mock Calls
Another powerful feature is the ability to verify if a mock was called, and with what parameters. This can be crucial for testing interactions between components:
```
Describe "Get-Weather" {
Mock Invoke-RestMethod {
return @{ temperature = 75; condition = 'Sunny' }
}
It "should call Invoke-RestMethod with the correct URI" {
Get-Weather -City "San Francisco"
Assert-MockCalled Invoke-RestMethod -ParameterFilter {
$Uri -eq "https://api.weather.com/v3/wx/conditions/current?city=San Francisco"
}
}
}
```
In this test, **Assert-MockCalled** ensures that **Invoke-RestMethod** was called with the expected URI. This helps you verify that your code interacts with dependencies correctly.
## The Benefits of Mocking in Pester
1. **Isolation**: By isolating the code under test, you can focus on its logic without worrying about external dependencies.
2. **Speed**: Tests run faster because they don't perform real operations like API calls, disk I/O, or database queries.
3. **Determinism**: Mocking allows you to control the responses of dependencies, making your tests more predictable and reliable.
4. **Coverage**: You can easily simulate edge cases and error conditions that might be difficult to reproduce in a real environment.
5. **Safety**: Avoid making real changes to the system during testing, which can be especially important in production-like environments.
## Conclusion
Mocking with Pester is an incredibly powerful feature that can greatly enhance your PowerShell testing experience. It allows you to write more reliable, efficient, and comprehensive tests by isolating your code from its dependencies. Whether you're a seasoned PowerShell developer or just getting started, mastering Pester's mocking capabilities will undoubtedly make your testing process smoother and more effective.
So, next time you're writing tests for your PowerShell scripts, remember the magic of mocking with Pester and harness its full potential to create robust, high-quality code. Happy testing!
| mstanojevic | |
1,868,224 | We Should Write Energy Efficient Code | I remember the days when Intel released new chips back in 2015 Intel I7 6000 Series, and it actually... | 0 | 2024-05-28T22:49:57 | https://sotergreco.com/we-should-write-energy-efficient-code | webdev | I remember the days when Intel released new chips back in 2015 Intel I7 6000 Series, and it actually meant something. We had real performance improvements, and you needed the new model. Taking chips from 14nm to 10nm was a big deal.
Now we have reached the limits of physics, so basically, 3nm of the Apple M4 is the smallest we can get with small room for improvement
## **Progression**
As we went down in nanometers, I actually thought that when we reached the limit, there would be no improvement.
But I was wrong. The problem all along was not the hardware; the problem was the software. The first to realize this were Apple developers when they changed the architecture of their CPUs and saw a massive improvement.
Imagine that a simple change to the software increased the performance of a CPU by 10 times with basically little to no improvement to the hardware.
This is a comparison of a relatively old M1 Max Chip with the latest I9 MacBooks that existed before the Apple Chips. Also, the power consumption is almost cut in half, which is why new MacBooks have much better battery life than the old Intel models.
## **Energy efficiency in 2010**
Do you remember when buying the new iPhone actually meant something? Now every model just gets a software update, and that’s it. No actual hardware improvements.
Creating websites in 2010 with PHP was not the most energy-efficient thing. As it turned out, you needed a lot of energy to run a PHP server at scale.
Both the x86 architecture consumed a lot of power, and the old PHP needed strong hardware to handle a lot of traffic.
Compared to 2024, we are still running code on x86, but our software has gotten a lot better, consuming much less power with better languages like Go or Rust or Even Kotlin.
## **Writing Energy Efficient Code**
Big O Notation plays a bigger role than previously imagined. You might think that as a single developer you might not make a change if you write clean and fast code, but I believe as developers we are making backward improvements, especially on the frontend.
When talking backend, Go is amazing, Kotlin is fast and clean, and even PHP is starting to become better. But on the front, energy efficiency is not something Vercel really looks into.
As time progresses, we need to realize that hardware has reached a limit and there is big room for improvement in our software.
## Efficiency > Power
People in 2024 value efficiency more than horse power. People don't want beast computers that pay $6000 for and weight 20lbs. They want lightweight programs running on ARM Chips written in Go, Rust. We need to double-down on improving the performance of our code rather than wanting 1000 Watts to run Adobe Photoshop on x86.
Also battery life is much more important. That's why I made a change on my software on Kotlin for my API's and vanilla Web Components on the frontend.
## **Solution**
The big tech companies have already started focusing on software and architecture instead of adding more transistors.
As individuals, we should shift our focus to faster and memory-efficient languages on the backend and simplify our frontend code.
Electron for desktop should be discarded, and React Native for mobile should be used with ease.
Overall, monitor metrics like size and memory consumption for your apps and try to reduce them as much as possible.
Paying $10k per month on AWS isn’t a solution just because we can. JetBrains requiring 4GB of RAM just to open the IDE isn’t normal. They should actually switch to Go or Rust.
## Conclusion
We can create the illusion of faster hardware simply by making significant improvements to our software. By optimizing our code and focusing on efficiency, we can enhance performance without needing to upgrade physical components. This means writing cleaner, more efficient code, choosing faster and more memory-efficient programming languages, and simplifying our frontend frameworks.
Ultimately, by prioritizing software optimization, we can achieve the performance gains that might otherwise seem possible only with hardware upgrades. This shift in focus can lead to more sustainable and cost-effective solutions in the tech industry.
Thanks for reading, and I hope you found this article helpful. If you have any questions, feel free to email me at [**kourouklis@pm.me**](mailto:kourouklis@pm.me)**, and I will respond.**
You can also keep up with my latest updates by checking out my X here: [**x.com/sotergreco**](http://x.com/sotergreco) | sotergreco |
1,866,256 | Manufacturers innovate with Brainboard | Leading manufacturers are investing in automation and digital capabilities. Traditional practices are... | 0 | 2024-05-28T22:42:00 | https://dev.to/brainboard/manufacturers-innovate-with-brainboard-44ei | industry, terraform, automotive, airlines | Leading manufacturers are investing in automation and digital capabilities. Traditional practices are being modernized with cloud infrastructure to boost revenue and reduce operating expenses.
Elastic infrastructure creates new opportunities for differentiation, but it also increases the attack surface for hackers.
To achieve new levels of innovation — along with security and compliance — top manufacturers work with Brainboard. Learn how they are using Brainboard to deliver new customer experiences, and to run more securely and efficiently.
> The visibility, transparency, and control we have with Brainboard eliminates so many of the service discovery and connectivity obstacles that used to prevent us from working as quickly and efficiently as we wanted.
## **Challenge:**
Manufacturers need to rapidly deploy and integrate new production lines to meet market demands or innovate product offerings. Traditional infrastructure management can delay these deployments, affecting time to market and operational efficiency.
## **Brainboard accelerates digital transformation for manufacturers around the world**
Brainboard enables manufacturers to quickly design, simulate, and deploy cloud infrastructures that support new production lines. Its intuitive drag-and-drop interface allows even those with limited coding knowledge to participate in infrastructure setup, speeding up the deployment process and ensuring that production lines are up and running faster.
## **Implementation:**
1. **Rapid Prototyping:** Use Brainboard’s designer to create and test new production line setups in a virtual environment before actual deployment, accelerating cloud adoption.
2. **Integration of IoT and Automation Tools:** Seamlessly integrate IoT devices and automation tools into the production line through easy-to-configure cloud infrastructure templates.
3. **Real-time Monitoring and Adjustments:** Use Brainboard’s visual monitoring tools to oversee production lines and make immediate adjustments and quickly respond to new market opportunities, seasonal campaigns, product launches and security incidents.
4. Protect customer data and business systems through zero trust security and improve efficiency across multi-cloud environments.
## **Outcome:**
Manufacturers reduce the time it takes to bring new production lines online from weeks to days, significantly increasing their agility. Enhanced ability to respond to market trends and technological advances results in better product quality and higher customer satisfaction.
## Ready to get started?
[Talk to our technical sales team](https://meetings.hubspot.com/brainboard/discovery) to answer your questions. | miketysonofthecloud |
1,868,223 | suppressHydrationWarning. What is it? | You might have faced an error like “Hydration failed because the initial UI does not match what was... | 0 | 2024-05-28T22:41:36 | https://dev.to/ramunarasinga/suppresshydrationwarning-what-is-it-2edd | javascript, opensource, nextjs, node | You might have faced an error like “Hydration failed because the initial UI does not match what was rendered on the server.” So did [shadcn-ui/ui](https://github.com/shadcn-ui/ui/blob/main/apps/www/app/layout.tsx). How can I be so sure? because they have suppressHydrationWarning attribute in the [app/layout.tsx](https://github.com/shadcn-ui/ui/blob/main/apps/www/app/layout.tsx)
I am making efforts to understand how shadcn-ui/ui is built and in this process, I saw suppressHydrationWarning in the app/layout.tsx.
I found this next.js documentation link: [Text content does not match server-rendered HTML](https://nextjs.org/docs/messages/react-hydration-error) and it is quite insightful.
### Why does hydration error occur?
When there is a mismatch between the React tree pre-rendered on server and the first rendered React tree in the browser, in other words, during hydration.
[Hydration](https://react.dev/reference/react-dom/client/hydrateRoot) is when React converts the pre-rendered HTML from the server into a fully interactive application by attaching event handlers.
The following common causes are picked from the Next.js documentation
> [Build shadcn-ui/ui from scratch.](https://tthroo.com/)
### Common Causes
Hydration errors can occur from:
1. Incorrect nesting of HTML tags
- `<p>` nested in another `<p>` tag
- `<div>` nested in a `<p>` tag
- `<ul>` or `<ol>` nested in a `<p>` tag
- [Interactive Content](https://html.spec.whatwg.org/#interactive-content-2) cannot be nested (`<a>` nested in a `<a>` tag, <button> nested in a `<button>` tag, etc.)
2\. Using checks like typeof window !== 'undefined' in your rendering logic
3\. Using browser-only APIs like window or localStorage in your rendering logic
4\. Using time-dependent APIs such as the Date() constructor in your rendering logic
5. [Browser extensions](https://github.com/facebook/react/issues/24430) modifying the HTML
6\. Incorrectly configured [CSS-in-JS libraries](https://nextjs.org/docs/app/building-your-application/styling/css-in-js)
* Ensure your code is following [our official examples](https://github.com/vercel/next.js/tree/canary/examples)
7\. Incorrectly configured Edge/CDN that attempts to modify the html response, such as Cloudflare [Auto Minify](https://developers.cloudflare.com/speed/optimization/content/auto-minify/)
### Possible solutions:
There are three possible ways to fix the hydration error.
[Solution 1: Using](https://nextjs.org/docs/messages/react-hydration-error#solution-1-using-useeffect-to-run-on-the-client-only) useEffect [to run on the client only](https://nextjs.org/docs/messages/react-hydration-error#solution-1-using-useeffect-to-run-on-the-client-only)
[Solution 2: Disabling SSR on specific components](https://nextjs.org/docs/messages/react-hydration-error#solution-2-disabling-ssr-on-specific-components)
[Solution 3: Using](https://nextjs.org/docs/messages/react-hydration-error#solution-3-using-suppresshydrationwarning) suppressHydrationWarning
This stackoverflow question: [How To Solve React Hydration Error in Next](https://stackoverflow.com/questions/73451295/how-to-solve-react-hydration-error-in-next) was solved by using the appropriate tbody tag in the table. Although #1 in [common causes](https://nextjs.org/docs/messages/react-hydration-error#common-causes) does not specifically point out that for table tag, hydration error might occur if you skip adding tbody, it is worth considering.
See [Suppress Hydration Warning (React Docs)](https://reactjs.org/docs/dom-elements.html#suppresshydrationwarning):
> _If you set suppressHydrationWarning to true, React will not warn you about mismatches in the attributes and the content of that element. It only works one level deep, and is intended to be used as an escape hatch. Don’t overuse it. You can read more about hydration in the ReactDOM.hydrateRoot() documentation._
### Conclusion:
Use suppressHydrationWarning as your last resort if you cannot resolve the issue by referring to common causes.
I said last resort because consider this sentence from the Next.js docs — “Sometimes content will inevitably differ between the server and client, such as a timestamp. You can silence the hydration mismatch warning by adding suppressHydrationWarning={true} to the element.”, it says “content will inevitably differ”.
| ramunarasinga |
1,868,222 | Relocating? Ultimate Guide To Find Your Next Apartment | Find your new home abroad | 0 | 2024-05-28T22:35:47 | https://confidence.sh/blog/find-your-next-apartment/ | life, personal, digitalnormad | ---
published: true
cover_image: https://dev-to-uploads.s3.amazonaws.com/uploads/articles/svk67m8spy4rnqut4vyx.png
# published_at: 2024-05-28 22:24 +0000
title: "Relocating? Ultimate Guide To Find Your Next Apartment"
description: "Find your new home abroad"
canonical_url: https://confidence.sh/blog/find-your-next-apartment/
tags: ["life", "personal", "digitalnormad"]
---
Heya, how's it going? [My previous post](https://confidence.sh/blog/my-experience-relocating-to-england/) seemed well received, so I wanted to write a follow-up. This article discusses a few things to look out for when searching for accommodation in a new city. You may have recently moved or plan to do so in the coming months, I hope you find this is helpful.
I know getting the right apartment and moving in can be difficult and stressful. So I hope you find a tip or two from this article to help you save time and money.
## Start Searching Early
This is probably the most important tip on this list. It’s super important to start your apartment search early as it will save you a lot of time and effort. Because I did this, I got my apartment in just two weeks of moving, saving several hundred pounds and a lot of time. You can too!
Most cities have online sites where lettings are listed. [Rightmove](https://www.rightmove.co.uk/), [OnTheMarket](https://www.onthemarket.com/), and [Zoopla](https://www.zoopla.co.uk/) are quite popular in the UK. Using these sites, you can search for a place that meets your requirements and book a viewing with the agent. The best part is you don’t have to be in the city to do all of this because everything you need is online. It takes about a week to get a viewing confirmation, so take advantage of this and book in advance. I took my advice and had four confirmed viewings the week I got to the city I live.
## Set A Budget
It might seem obvious, but sometimes we need a reminder. That said, I wouldn’t advise having a strict budget because it may mean you’ll miss out on some great deals. So have a base budget, then set a buffer. For instance, I set aside an extra £100 if I saw something exceptional. Having a budget can also help you streamline your search. Most online sites let you filter properties by price, making it quicker.
Another benefit of having a clear budget is that it can help you find great deals elsewhere. While your budget may only get you a studio flat in one city, it may get you a duplex in another. It may sound like I’m over-exaggerating, but it’s true. Of course, there are always trade-offs, but having a budget will help you optimize your search to get the best value for money.
## “This is not a drill”
The idea here is to take your search seriously. I lost a pretty good deal because I wasn’t as aggressive as I should have been. Don’t make the same mistake, many others are searching too and you’ll have to beat them to it. It’s survival of the quickest. So go above and beyond to make an offer the agent/landlord can't refuse. You can go as far as offering to pay 6 months up-front or offer to pay a slightly higher rent. Whatever the case, you should play to win.
Speaking about taking things seriously, you should use a tool to track your progress. I used a Kanban board to keep track of flats I liked and updated it frequently. This helped me keep the search organized. Also, you start to notice certain patterns when using a tracker For instance, the rent of apartments with certain amenities always falls in close brackets, or a single building may have different agents handling each flat with significant price variations. This means it’s possible to get another flat in the same building for significantly less.
## Don’t Get Scammed
This could happen in various ways. First, you could get scammed by fake agents. Remember that scammers are everywhere, so be cautious of any suspicious behaviour by the agent. You could also get scammed by the images of properties posted online. Images usually don’t tell an accurate story. Sometimes, images are enhanced to make the apartment appear larger or newer than the property is, and it can be misleading.
The best way to avoid both traps is to view the property yourself. Only legitimate agents can provide viewing access to the property. So if an agent wants you to make payment before viewing the property—that’s a red flag. Also, when you go for a viewing, you have a better sense of the size of the flat, and its state of maintenance. Then proceed your expectations are met.
## One More Thing. Actually, Many
If it’s your first time in the UK, you’ll need to know about [EPC ratings](https://www.gov.uk/selling-a-home/energy-performance-certificates). In summary, it’s an A to G metric to measure the energy efficiency of a flat—where A is most efficient. My advice is you aim for flats between 'A' to 'C'. You'll also want to ensure your [Council tax](https://www.moneyhelper.org.uk/en/homes/buying-a-home/how-to-save-money-on-your-council-tax-bill) falls within a reasonable band to avoid paying higher taxes.
Heating should be the largest chunk of your electricity bill, so if you want to save cost, you could go with a gas-heated apartment. The drawback is gas outages are quite frequent, and you may spend a night or two in the cold, without any heating. Conversely, electric heaters are a bit expensive to run, but way more reliable. So, pick your poison.
## Conclusion
Great! So these are a few things to keep in mind when house hunting. Before you go, I’ll leave you with this hot take. In my opinion, houses with visible pillars are poorly designed and you should stay away from them. It’s common for buildings to have load-bearing pillars, but it’s purely bad design to create apartment layouts that reveal them.
This looks ridiculous:
That’s it from me, see you next time. Bye bye! [Follow me Twitter for more updates](https://twitter.com/megaconfidence).
| megaconfidence |
1,868,169 | Top 7 Featured DEV Posts of the Week | Welcome to this week's Top 7, where the DEV Team handpicks our favorite posts from the previous... | 0 | 2024-05-28T22:21:32 | https://dev.to/devteam/top-7-featured-dev-posts-of-the-week-160j | top7 | _Welcome to this week's Top 7, where the DEV Team handpicks our favorite posts from the previous week._
Congrats to all the authors that made it onto the list 👏
{% embed https://dev.to/madsstoumann/wheel-of-fortune-with-css-p-pi-1ne9 %}
Follow Mads' journey in recreating this commonly used pop-up. We dare you not to spin!
---
{% embed https://dev.to/jenc/stop-resizing-your-browser-improve-testing-for-responsiveness-4pbm %}
Jenn shares all the things browser resizing won't account for, and explains how to utilize better tools and techniques for mobile testing.
---
{% embed https://dev.to/lowlighter/make-naked-websites-look-great-with-matchacss-4ng7 %}
Check out matcha.css, a lightweight, free and open-source css library that uses semantic styling.
---
{% embed https://dev.to/dshafik/finding-terminal-utopia-583k %}
Follow along Davey's journey towards Nerdvana as he sets up a new laptop from scratch and evaluates his terminal set up.
---
{% embed https://dev.to/srbhr/search-will-be-the-future-of-llm-and-ai-applications-26fl %}
Saurabh highlights the importance of developing efficient search architectures alongside LLM applications.
---
{% embed https://dev.to/shuttle_dev/building-agentic-rag-with-rust-openai-qdrant-3bjd %}
Learn how to build an agent-based Retrieval-Augmented Generation (RAG) system using Rust, OpenAI, and Qdrant.
---
{% embed https://dev.to/cyclops-ui/is-kubernetes-a-database-crds-explained-in-three-minutes-361d %}
Juraj explains the role of Custom Resource Definitions in Kubernetes and whether Kubernetes can be considered a database.
---
_And that's a wrap for this week's Top 7 roundup! 🎬 We hope you enjoyed this eclectic mix of insights, stories, and tips from our talented authors. Keep coding, keep learning, and stay tuned to DEV for more captivating content and [make sure you’re opted in to our Weekly Newsletter] (https://dev.to/settings/notifications) 📩 for all the best articles, discussions, and updates._ | thepracticaldev |
1,868,161 | Pele Radiante:Os Melhores Óleos Essenciais para Limpeza Profunda | A busca por uma pele impecável e radiante é uma jornada constante. Entre os tesouros da natureza... | 0 | 2024-05-28T22:19:00 | https://dev.to/vidacomartesanato/pele-radianteos-melhores-oleos-essenciais-para-limpeza-profunda-4lfk | peleradiante, óleos, óleosessenciais, limpezadepel |
A busca por uma pele impecável e radiante é uma jornada constante.
Entre os tesouros da natureza que nos ajudam nessa busca, o óleo de camomila se destaca como um calmante excepcional para a pele irritada.
Este artigo explora as maravilhas do óleo de [camomila](https://pt.wikipedia.org/wiki/Camomila) e como ele pode ser integrado em sua rotina de cuidados com a pele.
## O Poder Calmante do Óleo de Camomila:
O óleo de camomila é um elixir suave, mas poderoso, conhecido por suas propriedades anti-inflamatórias e antioxidantes.
Ele é particularmente benéfico para acalmar a pele irritada, reduzindo a vermelhidão e proporcionando alívio imediato para condições como eczema e rosácea.
## Incorporando Óleo de Camomila na Rotina de Cuidados com a Pele:
Integrar o óleo de camomila em sua rotina de cuidados com a pele é fácil e eficaz. Você pode começar adicionando algumas gotas a seu hidratante diário ou soro noturno, permitindo que as propriedades calmantes do óleo trabalhem enquanto você descansa.
## Receitas Caseiras com Óleo de Camomila:
Uma das melhores maneiras de aproveitar os benefícios do óleo de camomila é criando suas próprias misturas em casa. Aqui estão duas receitas simples que você pode experimentar:
## Máscara Facial Calmante de Camomila:
Misture 2 colheres de sopa de mel orgânico com 4 gotas de óleo de camomila.
Adicione 1 colher de sopa de iogurte natural para uma consistência cremosa.
Aplique a mistura no rosto limpo e deixe agir por 15 minutos antes de enxaguar com água morna.
## Óleo de Limpeza Profunda de Camomila:
Combine 1/4 de xícara de óleo de coco derretido com 10 gotas de óleo de camomila.
Adicione 5 gotas de óleo de lavanda para potencializar o efeito calmante.
Use a mistura para remover maquiagem e impurezas, massageando suavemente a pele e enxaguando com água morna.
## Acalmando a Pele com Óleo de Camomila:
O óleo de camomila é um tratamento eficaz que pode ser aplicado em todas as idades e tipos de pele.
Suas propriedades suavizantes são especialmente úteis após procedimentos estéticos ou exposição ao sol.
## Óleo de Camomila e Aromaterapia:
Além dos benefícios tópicos, o óleo de camomila também pode ser usado em aromaterapia.
Inalar o aroma do óleo de camomila pode ajudar a reduzir o estresse e promover uma sensação de bem-estar, o que indiretamente beneficia a saúde da pele.
## Óleo de Camomila para Pele Sensível:
A pele sensível requer cuidados especiais, e o óleo de camomila é um ingrediente notável que pode oferecer o alívio necessário.
Conhecido por suas propriedades suavizantes e anti-inflamatórias, o óleo de camomila é ideal para acalmar a pele irritada e minimizar desconfortos como coceira e vermelhidão.
## Por Que Escolher Óleo de Camomila para Pele Sensível:
O óleo de camomila contém **bisabolol**, um composto que ajuda a reduzir a inflamação e a acalmar a pele sensível.
É uma escolha natural para aqueles que buscam uma solução gentil para acalmar a pele irritada sem recorrer a produtos químicos agressivos que podem exacerbar a sensibilidade.
## Como Aplicar Óleo de Camomila em Pele Sensível:
Para aplicar o óleo de camomila em pele sensível, comece com uma pequena quantidade para garantir que não haja reação adversa.
Você pode diluir o óleo de camomila com um óleo transportador, como óleo de jojoba ou amêndoas, para criar uma mistura mais suave que ainda seja eficaz para acalmar a pele irritada.
## Integrando Óleo de Camomila na Rotina de Cuidados com a Pele Sensível:
Inclua o óleo de camomila em sua rotina diária de cuidados com a pele, aplicando-o como parte de seu regime noturno ou adicionando-o a produtos como loções e cremes específicos para pele sensível.
Isso ajudará a manter a pele calma e protegida ao longo do dia.
## Benefícios a Longo Prazo do Óleo de Camomila para Pele Sensível:
Com o uso regular, o óleo de camomila pode ajudar a fortalecer a barreira cutânea da pele sensível, tornando-a menos propensa a irritações futuras.
Além de acalmar a pele irritada, o **óleo de camomila** também pode melhorar a aparência geral da pele, deixando-a mais uniforme e radiante.
## Óleo de Camomila e Cuidados Noturnos:
A noite é um período de restauração e cura para o nosso corpo, e a pele não é exceção.
Integrar o óleo de camomila em sua rotina de cuidados noturnos pode ser uma estratégia eficaz para aproveitar este tempo de renovação.
Enquanto dormimos, nossa pele passa por um ciclo de reparo celular, e o **óleo de camomila** pode ajudar a acelerar esse processo, resultando em uma pele mais suave e rejuvenescida pela manhã.
O óleo de camomila é particularmente adequado para uso noturno devido às suas propriedades calmantes.
Ele pode ajudar a reduzir a inflamação e a vermelhidão que podem ocorrer durante o dia, seja por estresse ambiental ou por irritações cutâneas.
Ao aplicar o óleo de camomila antes de dormir, você permite que seus agentes ativos trabalhem ininterruptamente, maximizando os benefícios para a pele.
Além disso, o óleo de camomila contém compostos que podem promover um sono mais tranquilo.
A aromaterapia com óleo de camomila tem sido associada à redução da ansiedade e à indução do relaxamento, o que pode melhorar a qualidade do sono.
Um sono de qualidade não só é essencial para o bem-estar geral, mas também é crucial para a saúde da pele.
Para aqueles que lutam contra a pele seca ou desidratada, o óleo de camomila pode ser um hidratante noturno eficaz.
Suas propriedades emolientes ajudam a reter a umidade, mantendo a pele hidratada durante toda a noite.
Isso é especialmente benéfico durante os meses de inverno, quando o ar frio e seco pode extrair a umidade da pele.
## Dicas para Incluir Óleo de Camomila na Rotina Noturna:
## Como Hidratante Noturno:
Após a limpeza, aplique algumas gotas de óleo de camomila diretamente na pele ou misture com seu hidratante favorito.
Massageie suavemente em movimentos circulares para promover a absorção e estimular a circulação.
## Tratamento para Áreas Específicas:
Para áreas com vermelhidão ou eczema, aplique o óleo de camomila diretamente com um cotonete.
Deixe agir durante a noite para uma ação calmante intensiva.
## Máscara Facial Noturna:
Combine o óleo de camomila com ingredientes como; **aloe vera **ou **argila para criar uma máscara facial calmante.
Aplique a máscara e deixe-a durante a noite, se os ingredientes forem adequados para uso prolongado.
## Banho Relaxante:
Adicione algumas gotas de óleo de camomila à água do banho para um efeito relaxante antes de dormir.
O vapor ajudará a abrir os poros e permitir que o óleo penetre melhor na pele.
## Compressa Calmante:
Umedeça um pano com água morna e adicione algumas gotas de óleo de camomila.
Aplique como uma compressa nas áreas irritadas para **aliviar a inflamação.**
## Benefícios do Uso Noturno do Óleo de Camomila:
O uso noturno do óleo de camomila oferece vários benefícios, incluindo a **redução da inflamação** e a **promoção de uma pele** mais uniforme e luminosa.
Suas propriedades calmantes também podem ajudar a melhorar a qualidade do sono, o que é benéfico para a saúde geral da pele.
Conclusão:
O **óleo de camomila** é um ingrediente versátil e eficaz para manter a pele jovem e saudável.
Experimente incorporá-lo em sua rotina de cuidados com a pele e descubra por si mesmo os seus benefícios transformadores. | vidacomartesanato |
1,868,159 | How to Resolve Node.js ERR_OSSL_EVP_UNSUPPORTED Error | Are you facing the notorious ERR_OSSL_EVP_UNSUPPORTED error in your Node.js applications? This error... | 0 | 2024-05-28T22:17:01 | https://dev.to/saint_vandora/how-to-resolve-nodejs-errosslevpunsupported-error-1cd1 | webdev, javascript, programming, node | Are you facing the notorious `ERR_OSSL_EVP_UNSUPPORTED error` in your Node.js applications?
This error is a common stumbling block that occurs due to changes in cryptographic operations handling introduced with [Node.js version 17](https://nodejs.org/en/blog/release/v17.0.0). The root of the problem lies in the default configuration of [OpenSSL](https://www.openssl.org/) in newer Node.js versions, which restricts the use of certain algorithms. Fortunately, there are effective solutions to overcome this error, ensuring your development process remains smooth and uninterrupted.
## Why Does This Error Occur?
The `ERR_OSSL_EVP_UNSUPPORTED error` typically arises when applications or dependencies try to invoke cryptographic algorithms that are no longer supported by default in the OpenSSL version bundled with Node.js v17 and later. This change is part of an effort to enhance security by discouraging the use of older, potentially vulnerable cryptographic practices.
## Resolving the Error
There are several strategies to resolve this error, each suited to different needs and project requirements. Below, we explore the most effective solutions:
1.**Utilize the OpenSSL Legacy Provider**
A quick fix to bypass this issue is to instruct Node.js to use the OpenSSL legacy provider. This can be achieved by setting an environment variable:
**Temporary Fix:**
```
export NODE_OPTIONS=--openssl-legacy-provider
npm start
```
**Permanent Fix:**
Add the environment variable to your shell configuration file to ensure it persists across sessions.
```
echo 'export NODE_CODE=--openssl-legacy-provider' >> ~/.zshrc
source ~/.zshrc
```
2.**Downgrade Node.js**
For projects that are not yet compatible with the latest Node.js versions, downgrading to an earlier version such as Node.js v16.x can be a practical solution:
**Using [nvm](https://github.com/nvm-sh/nvm) (Node Version Manager):**
```
nvm install 16
nvm use 16
```
If you don't have nvm installed, you can set it up easily:
```
curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.39.1/install.sh | bash
# or
wget -qO- https://raw.githubusercontent.com/nvm-sh/nvm/v0.39.1/install.sh | bash
```
3.**Update Your Dependencies**
Keeping your project’s dependencies updated is crucial, especially those that utilize Node.js’s crypto APIs, such as webpack and sass-loader. An updated ecosystem can potentially resolve compatibility issues:
```
npm update
```
## Conclusion
Choosing the right approach to resolve the `ERR_OSSL_EVP_UNSUPPORTED error` depends on your project's specific needs and environment. Whether you opt for a quick workaround by setting an environment variable, downgrade Node.js for compatibility, or update your dependencies for a more long-term solution, each method offers a reliable way to keep your Node.js applications running smoothly.
Thanks for reading...
**Happy Coding!** | saint_vandora |
1,868,155 | Self-Hosted WordPress Plugin Updates | Thinking of monetizing your WordPress plugin? You'll need to take care of version updates and it's simpler than you think. | 0 | 2024-05-28T22:04:08 | https://drazen.bebic.dev/blog/self-hosted-wordpress-plugin-updates | wordpress, php | ---
title: Self-Hosted WordPress Plugin Updates
published: true
description: Thinking of monetizing your WordPress plugin? You'll need to take care of version updates and it's simpler than you think.
tags: WordPress, PHP
cover_image: https://dev-to-uploads.s3.amazonaws.com/uploads/articles/fmy98co1ny2dfyp1wcrn.jpeg
canonical_url: https://drazen.bebic.dev/blog/self-hosted-wordpress-plugin-updates
---
So you developed your own plugin and now want to monetize on it. Since it's not free, you can't use the WordPress Plugin Repository for this purpose because it only supports free plugins. You will need to either host it on a marketplace or host it yourself. If you chose the latter and don't know how, then this guide is for you.
## What will we be doing?
It takes a solid amount of effort, but it's not too complex. It basically boils down to two things:
1. **Client** - Point your WordPress plugin to your own server for updates
2. **Server** - Build & deploy an update server to handle said updates
The first point is rather simple. It takes a couple of hooks to modify your plugin in such a way that it points to a custom server for plugin updates.
The most effort lies in developing an update server which makes sense for you. This is also the part that is up to you on how to design it, since there is no single approach that will work for everyone. For the sake of simplicity, I have developed this as a WordPress plugin. In the past I also used an app built on the PERN stack. Anything goes.
## The Client Plugin
I have created a simple plugin where everything is located in the main plugin file. Of course you can split this up into separate files, use classes, composer with autoloading, etc. But for simplicity's sake we will throw everything into one pot 🍲
### Preparation
Before we start with the actual code, let's define some constants to make our life a little bit easer.
```php
/*
Plugin Name: Self-Hosted WordPress Plugin Updates - Client
Description: Demo plugin showcasing a client plugin which updates from a custom update server.
Version: 1.0.0
Author: Drazen Bebic
Author URI: https://drazen.bebic.dev
Text Domain: shwpuc
Domain Path: /languages
*/
// Current plugin version.
define( "SHWPUC_PLUGIN_VERSION", "1.0.0" );
// Output of this will be
// "self-hosted-plugin-updates/self-hosted-plugin-updates.php".
define( "SHWPUC_PLUGIN_SLUG", plugin_basename( __FILE__ ) );
// Set the server base URL. This should
// be replaced with the actual URL of
// your update server.
define( "SHWPUC_API_BASE_URL", "https://example.com/wp-json/shwpus/v1" );
/**
* Returns the plugin slug: self-hosted-plugin-updates
*
* @return string
*/
function shwpuc_get_plugin_slug() {
// We split this string because we need the
// slug without the fluff.
list ( $t1, $t2 ) = explode( '/', SHWPUC_PLUGIN_SLUG );
// This will remove the ".php" from the
// "self-hosted-plugin-updates.php" string
// and leave us with the slug only.
return str_replace( '.php', '', $t2 );
}
```
We defined a new plugin, constants for the plugin version, slug, and the base URL of our update server. Another thing we added is a function to retrieve the plugin slug, without the ".php" ending.
### Package download
The very first thing we want to do is to add a filter to the `pre_set_site_transient_update_plugins` hook. We will modify the response for our plugin so that it checks the remote server for a newer version.
```php
/**
* Add our self-hosted auto-update plugin
* to the filter transient.
*
* @param $transient
*
* @return object $transient
*/
function shwpuc_check_for_update( $transient ) {
// This will be "self-hosted-plugin-updates-client"
$slug = shwpuc_get_plugin_slug();
// Set the server base URL. This should be replaced
// with the actual URL of your update server.
$api_base = SHWPUC_API_BASE_URL;
// This needs to be obtained from the
// site settings. Somewhere set by a
// setting your plugin provides.
$license_i_surely_paid_for = 'XXX-YYY-ZZZ';
// Get the remote version.
$remote_version = shwpuc_get_remote_version( $slug );
// This is the URL the new plugin
// version will be downloaded from.
$download_url = "$api_base/package/$slug.$remote_version.zip?license=$license_i_surely_paid_for";
// If a newer version is available, add the update.
if ( $remote_version
&& version_compare( SHWPUC_PLUGIN_VERSION, $remote_version, '<' )
) {
$obj = new stdClass();
$obj->slug = $slug;
$obj->new_version = $remote_version;
$obj->url = $download_url;
$obj->package = $download_url;
$transient->response[ SHWPUC_PLUGIN_SLUG ] = $obj;
}
return $transient;
}
// Define the alternative API for updating checking
add_filter( 'pre_set_site_transient_update_plugins', 'shwpuc_check_for_update' );
```
This function alone already does quite a lot of the heavy lifting, it...
1. Retrieves the latest plugin version from the remote server.
2. Checks if the remote version is greater than the currently installed version.
3. Passes the `license` URL parameter to the download link.
4. Stores update information into the transient if there is a newer version available.
### Version Check
You probably noticed the `shwpu_get_remote_version()` function, so let's get into that now.
```php
/**
* Return the latest version of a plugin on
* the remote update server.
*
* @return string|null $remote_version
*/
function shwpuc_get_remote_version( $slug ) {
$api_base = SHWPUC_API_BASE_URL;
$license = 'XXX-YYY-ZZZ';
$url = "$api_base/version/$slug?license=$license";
$request = wp_remote_get( $url );
if ( ! is_wp_error( $request )
|| wp_remote_retrieve_response_code( $request ) === 200
) {
return $request['body'];
}
return null;
}
```
Pretty straightforward: Send the request and pass on the response.
### Plugin Information
Now our plugin knows that there is a new version, but what about the "What's new?" section and the changelog for this new fancy-pants version? Gues what? We need *another* hook for this.
```php
/**
* Add our self-hosted description to the filter
*
* @param boolean $false
* @param array $action
* @param stdClass $arg
*
* @return bool|stdClass
*/
function shwpuc_check_info( $false, $action, $arg ) {
// This will be "self-hosted-plugin-updates"
$slug = shwpuc_get_plugin_slug();
// Abort early if this isn't our plugin.
if ( $arg->slug !== $slug ) {
return false;
}
// Set the server base URL. This should be replaced
// with the actual URL of your update server.
$api_base = SHWPUC_API_BASE_URL;
$license = 'XXX-YYY-ZZZ';
$url = "$api_base/info/$slug?license=$license";
$request = wp_remote_get( $url );
if ( ! is_wp_error( $request )
|| wp_remote_retrieve_response_code( $request ) === 200
) {
return unserialize( $request['body'] );
}
return null;
}
// Define the alternative response for information checking
add_filter( 'plugins_api', 'shwpuc_check_info', 10, 3 );
```
This hook will trigger when you go to check the changelog of the newly available update for your plugin. Your update server needs to return information about the new version, like the description, changelog, and anything else you think is important to know.
## The Update Server
Now that we covered the basics about what the client plugin should do, let's do the same for the update server. Like I said before, this part leaves a lot more room for interpretation, becasue it is a 3rd party application which you can design and run on anything you want. You only need to make sure that the response is compatible with WordPress.
For this demo, I decided to use a simple WordPress plugin which you would install on a regular WordPress instance. This WordPress instance will then act as your plugin update server.
> **Important:** The client and server plugin will not work on the same WordPress instance! When the client tries to perform the update, it will automatically turn on maintenance mode on the WordPress instance, which disables the REST API, which makes the download of the new package version fail.
### API routes
This server plugin will have to provide a handful of API routes which we have previously mentioned in the client plugin, and those are:
1. **`/v1/version/:plugin`** - Used to check the latest version of the plugin.
2. **`/v1/info/:plugin`** - Used to check the information about the latest version of the plugin.
3. **`/v1/package/:plugin`** - Used to download the latest version of the plugin.
#### Registering the routes
The very first thing you need to do is to register the necessary REST API routes with WordPress. We will register one route for every endpoint mentioned previously. Pretty straightforward:
```php
/**
* Registers the routes needed by the plugins.
*
* @return void
*/
function shwpus_register_routes() {
register_rest_route(
'shwpus/v1',
'/version/(?P<plugin>[\w-]+)',
array(
array(
'methods' => WP_REST_Server::READABLE,
'callback' => 'shwpus_handle_plugin_version_request',
'permission_callback' => 'shwpus_handle_permission_callback',
'args' => array(
'plugin' => array(
'description' => 'The plugin slug, i.e. "my-plugin"',
'type' => 'string',
),
),
),
)
);
register_rest_route(
'shwpus/v1',
'/info/(?P<plugin>[\w-]+)',
array(
array(
'methods' => WP_REST_Server::READABLE,
'callback' => 'shwpus_handle_plugin_info_request',
'permission_callback' => 'shwpus_handle_permission_callback',
'args' => array(
'plugin' => array(
'description' => 'The plugin slug, i.e. "my-plugin"',
'type' => 'string',
),
),
),
)
);
register_rest_route(
'shwpus/v1',
'/package/(?P<plugin>[\w.-]+)',
array(
array(
'methods' => WP_REST_Server::READABLE,
'callback' => 'shwpus_handle_plugin_package_request',
'permission_callback' => 'shwpus_handle_permission_callback',
'args' => array(
'plugin' => array(
'description' => 'The plugin slug with the version, ending in .zip, i.e. "my-plugin.2.0.0.zip"',
'type' => 'string',
),
),
),
)
);
}
```
#### Permission Callback
You'll notice that I set the `permission_callback` to `shwpus_handle_permission_callback`. This function checks whether the license your client passed along is valid, so you know that the client is actually authorized for future updates.
You could also remove this check for the version and info routes, so that everyone gets notified about new version and knows what's new, but only the customers with valid licenses can actually update. To do this simply set the `permission_callback` to `__return_true`, which is a WordPress utility function which returns `true` right away.
Here's how our permission callback function looks like:
```php
/**
* @param WP_REST_Request $request
*
* @return true|WP_Error
*/
function shwpus_handle_permission_callback( $request ) {
$slug = $request->get_param( 'plugin' );
$license = $request->get_param( 'license' );
if ( $license !== 'XXX-YYY-ZZZ' ) {
return new WP_Error(
401,
'Invalid license',
array(
'slug' => $slug,
'license' => $license
)
);
}
return true;
}
```
#### Check the version
This route fetches the latest version of the given plugin from your databse or whatever else you have. It needs to return it as `text/html` with nothing but the version number as a response.
```php
/**
* Finds the latest version for a given plugin.
*
* @param WP_REST_Request $request
*
* @return void
*/
function shwpus_handle_plugin_version_request( $request ) {
// Retrieve the plugin slug from the
// request. Use this slug to find the
// latest version of your plugin.
$slug = $request->get_param( 'plugin' );
// This is hardcoded for demo purposes.
// Normally you would fetch this from
// your database or whatever other
// source of truth you have.
$version = '1.0.1';
header('Content-Type: text/html; charset=utf-8');
echo $version;
die();
}
```
After you've done that, your plugin should be able to tell you that there's a new version.
#### Plugin Information
This is where it gets interesting. This route needs to return the plugin information in a specific structure as a serialized PHP object. If you're using Node.js don't worry - there is a nifty npm package called [php-serialize](https://www.npmjs.com/package/php-serialize?activeTab=readme) which will let you do just that.
Since we're using PHP, there's no need for that and we can just call the PHP native `serialize()` function.
```php
/**
* Fetches information about the latest version
* of the plugin with the given slug.
*
* @param WP_REST_Request $request
*
* @return void
*/
function shwpus_handle_plugin_info_request( $request ) {
$slug = $request->get_param( 'plugin' );
$version = '1.0.1';
// This data should be fetched dynamically
// but for demo purposes it is hardcoded.
$info = new stdClass();
$info->name = 'Self-Hosted WordPress Plugin Updates - Client';
$info->slug = 'self-hosted-plugin-updates-client';
$info->plugin_name = 'self-hosted-plugin-updates-client';
$info->new_version = $version;
$info->requires = '6.0';
$info->tested = '6.5.3';
$info->downloaded = 12540;
$info->last_updated = '2024-05-23';
$info->sections = array(
'description' => '
<h1>Self-Hosted WordPress Plugin Updates - Client</h1>
<p>
Demo plugin showcasing a client plugin
which updates from a custom update
server.
</p>
',
'changelog' => '
<h1>We did exactly 3 things!</h1>
<p>
You thought this is going to be a huge update.
But it\'s not. Sad face.
</p>
<ul>
<li>Added a cool new feature</li>
<li>Added another cool new feature</li>
<li>Fixed an old feature</li>
</ul>
',
// You can add more sections this way.
'new_tab' => '
<h1>Woah!</h1>
<p>We are so cool, we know how to add a new tab.</p>
',
);
$info->url = 'https://drazen.bebic.dev';
$info->download_link = get_rest_url( null, "/shwpus/v1/package/$slug.$version.zip" );
header('Content-Type: text/html; charset=utf-8');
http_response_code( 200 );
echo serialize( $info );
die();
}
```
This should make your changes in the frontend visible.
#### Package Download
This is where your plugin will be downloaded from. For demo purposes I simply put the plugin .zip files in a `packages` directory which I put into `wp-content`. You can of course integrate whatever other file storage you have and fetch your plugin zips from there.
```php
/**
* @param WP_REST_Request $request
*
* @return void
*/
function shwpus_handle_plugin_package_request( $request ) {
// Contains the plugin name, version, and .zip
// extension. Example:
// self-hosted-plugin-updates-server.1.0.1.zip
$plugin = $request->get_param( 'plugin' );
// The packages are located in wp-content for
// demo purposes.
$file = WP_CONTENT_DIR . "/packages/$plugin";
if ( ! file_exists( $file ) ) {
header( 'Content-Type: text/plain' );
http_response_code( 404 );
echo "The file $file does not exist.";
die();
}
$file_size = filesize( $file );
header( 'Content-Type: application/octet-stream' );
header( "Content-Length: $file_size" );
header( "Content-Disposition: attachment; filename=\"$plugin\"" );
header( 'Access-Control-Allow-Origin: *' );
http_response_code( 200 );
readfile( $file );
die();
}
```
And last but not least, your plugin can now be fully updated!
## Conclusion
Hosting your own plugin update server is very much doable. The complexity increases with your requirements for the "backend" administration. If you need a UI then you will need to expand on the server part quite a lot.
The client part is pretty easy and straightforward, there's not much that you need to do except add a few hooks. You could go a step further and disable the plugin if there is no valid license present.
## Resources
I added the source code for these two plugins into two comprehensive GitHub gists.
1. [Client Plugin](https://gist.github.com/drazenbebic/4680c415371bb57e2a9997dc44a64a51)
2. [Server Plugin](https://gist.github.com/drazenbebic/448f018ba2095626ecb9edc93980fd1c) | drazenbebic |
1,868,136 | Instalar Docker en modo rootless (Sin privilegios root) | El modo sin raíz permite ejecutar el demonio Docker y los contenedores como usuario no raíz para... | 0 | 2024-05-28T22:01:26 | https://dev.to/systemsapatrick/instalar-docker-en-modo-rootless-sin-privilegios-root-52df | El modo sin raíz permite ejecutar el demonio Docker y los contenedores como usuario no raíz para mitigar posibles vulnerabilidades en el demonio y el tiempo de ejecución del contenedor.
**Pre-requisitos:**
- Tener actualizado docker
**Consideraciones**
**Proceso de instalación**
1.- Crear un nuevo usuario para Docker
Ejecuta los siguientes comandos para crear un usuario llamado test y asignarle una contraseña:
```
sudo useradd test
sudo passwd test
```
2.- Asignar permisos sudo al nuevo usuario
Abre el archivo de configuración de sudo:
```
sudo visudo
```
En la sección de usuarios, agrega la siguiente línea para otorgar permisos sudo al usuario test:
```
test ALL=(ALL:ALL) ALL
```
Guarda y cierra el archivo.
3.- Agregar el usuario a los grupos necesarios y ajustar IDs:
Ejecuta los siguientes comandos para agregar el usuario test a los grupos hiper y docker, y luego cambia su UID y GID a 1000:
```
usermod -aG test test
usermod -aG docker test
usermod -u 1000 test
groupmod -g 1000 test
```
4.- Deshabilitar Docker y habilitar linger para el usuario:
Desactiva el servicio Docker, habilita linger para el usuario test y reinicia el sistema:
```
sudo systemctl disable --now docker.service docker.socket
sudo loginctl enable-linger test
sudo reboot
```
5.- Instalar Docker en modo rootless:
Inicia sesión con el usuario test e instala Docker en modo rootless:
```
su - test
dockerd-rootless-setuptool.sh install --force --skip-iptables
```
Al finalizar la instalación, debería aparecer algo semejante a esto:
Si no aparece, algo en el proceso de instalación no se realizó de manera correcta.
6.- Actualizar el archivo .bashrc:
Abre el archivo .bashrc para editarlo:
```
vi ~/.bashrc
```
Agrega al final del archivo las siguientes líneas (estas se mencionan en la imagen anterior):
```
export PATH=/usr/bin:$PATH
export DOCKER_HOST=unix:///run/user/2002/docker.sock
```
Guarda y cierra el archivo. Luego, ejecuta el siguiente comando para aplicar los cambios:
```
source ~/.bashrc
```
7.- Verificar la creación del archivo docker.service:
Una vez realizada la instalación, debería haberse creado un archivo docker.service en la siguiente ruta. Revisa si el archivo existe:
```
vi ~/.config/systemd/user/docker.service
```
8.- Finalmente iniciamos docker en modo rootlees con el siguiente comando:
```
systemctl --user start docker
```
**Notas Adicionales:**
- Nota 1: Los archivos de configuración ahora se encuentran en la ruta mencionada.
- Nota 2: Luego de estos pasos, ya puedes instalar cualquier contenedor en Docker. Es importante tener en cuenta que estos contenedores no tendrán acceso a todos los archivos del sistema, sino únicamente a aquellos a los que el usuario test tenga acceso.
Este procedimiento asegura que Docker se ejecute en modo rootless con un usuario específico, manteniendo configuraciones seguras y adecuadas para tus necesidades
**Referencias**:
https://www.portainer.io/blog/portainer-and-rootless-docker
https://docs.docker.com/engine/security/rootless/
https://docs.docker.com/config/daemon/
| systemsapatrick | |
1,854,407 | Dev: DevOps | A DevOps Developer is a specialized professional responsible for streamlining the software... | 27,373 | 2024-05-28T22:00:00 | https://dev.to/r4nd3l/dev-devops-5653 | devops, developer | A **DevOps Developer** is a specialized professional responsible for streamlining the software development process by integrating development (Dev) and operations (Ops) practices. Here's a detailed description of the role:
1. **Software Development and Deployment:**
- DevOps Developers write code, develop applications, and implement software features using programming languages such as Python, Java, Ruby, or JavaScript.
- They collaborate with software engineers, testers, and system administrators to automate the build, test, and deployment processes.
2. **Infrastructure as Code (IaC):**
- DevOps Developers use infrastructure as code (IaC) tools such as Terraform, AWS CloudFormation, or Ansible to provision and manage infrastructure resources.
- They define infrastructure configurations in code, enabling reproducibility, scalability, and consistency across environments.
3. **Continuous Integration and Continuous Deployment (CI/CD):**
- DevOps Developers design and implement CI/CD pipelines to automate software delivery, testing, and deployment processes.
- They use CI/CD tools such as Jenkins, GitLab CI/CD, or CircleCI to build, test, and deploy code changes rapidly and reliably.
4. **Containerization and Orchestration:**
- DevOps Developers work with containerization technologies such as Docker and container orchestration platforms like Kubernetes to deploy and manage microservices-based applications.
- They containerize applications, manage container lifecycles, and scale containerized workloads to meet performance and availability requirements.
5. **Monitoring and Logging:**
- DevOps Developers set up monitoring and logging systems using tools such as Prometheus, Grafana, ELK Stack (Elasticsearch, Logstash, Kibana), or Splunk.
- They monitor application performance, track system metrics, and analyze logs to identify issues, optimize resource utilization, and ensure system reliability.
6. **Configuration Management:**
- DevOps Developers use configuration management tools such as Chef, Puppet, or Ansible to automate the configuration and management of servers and infrastructure components.
- They define infrastructure configurations, enforce compliance policies, and manage infrastructure changes efficiently.
7. **Security and Compliance:**
- DevOps Developers implement security best practices and compliance standards throughout the software development lifecycle (SDLC).
- They integrate security scanning tools, vulnerability assessments, and identity management solutions into CI/CD pipelines to detect and remediate security threats.
8. **Collaboration and Communication:**
- DevOps Developers collaborate with cross-functional teams, including developers, testers, system administrators, and business stakeholders, to align DevOps practices with business goals and objectives.
- They communicate project status, progress, and challenges through meetings, reports, and documentation, fostering transparency and alignment across teams.
9. **Cloud Computing and Infrastructure Management:**
- DevOps Developers leverage cloud computing platforms such as AWS, Azure, or Google Cloud to deploy, scale, and manage applications in cloud environments.
- They optimize cloud infrastructure, configure networking, and implement security controls to ensure robust and cost-effective cloud solutions.
10. **Continuous Learning and Improvement:**
- DevOps Developers stay updated on emerging technologies, DevOps practices, and industry trends through self-study, training programs, and certifications.
- They seek feedback, learn from past experiences, and continuously improve DevOps processes, tools, and workflows to enhance efficiency, reliability, and innovation.
In summary, a DevOps Developer plays a critical role in driving collaboration, automation, and innovation across software development and operations teams. By embracing DevOps principles and practices, they empower organizations to deliver high-quality software products rapidly and reliably, driving business agility and customer satisfaction. | r4nd3l |
1,866,706 | Python Architecture Essentials: Building Scalable and Clean Application for Juniors | Structuring a project with SOLID, KISS, DRY, and clean code principles, along with efficient design... | 27,473 | 2024-05-28T22:00:00 | https://dev.to/markparker5/python-architecture-essentials-building-scalable-and-clean-application-for-juniors-2o14 | python, development, tutorial, cleancode | Structuring a project with SOLID, KISS, DRY, and clean code principles, along with efficient design patterns. In simple words with real examples.
---
Dive into the fundamentals of scalable and clean application architecture in Python with this beginner-friendly guide. Here, we explore essential concepts such as Object-Oriented Programming (OOP), SOLID principles, Dependency Injection (DI), and typing. This article is designed to take you from zero to hero, transforming complex architectural standards into actionable insights that enhance modularity, low coupling, and high cohesion. Through practical examples, you'll learn how to develop multilayered architectures that ensure modularity and independence, preparing you for successful, maintainable projects.
## Some Clean Code Theory
Before diving into architecture, I would like to answer a few frequently asked questions:
- What are the benefits of specifying types in Python?
- What are the reasons for splitting an app into layers?
- What are the advantages of using OOP?
- What are the drawbacks of using global variables or singletons?
Feel free to skip the theory sections if you already know the answers and jump directly to the "Building the App" section.
### Always Annotate Types
Annotating all types in Python significantly enhances your code by increasing its clarity, robustness, and maintainability:
1. **Type Safety**: Type annotations help catch type mismatches early, reducing bugs and ensuring your code behaves as expected.
2. **Self-documenting Code**: Type hints increase the readability of your code and act as built-in documentation, clarifying the expected input and output data types of functions.
3. **Improved Code Quality**: Employing type hints encourages better design and architecture, promoting thoughtful planning and implementation of data structures and interfaces.
4. **Enhanced Tool Support**: Tools like **mypy** utilize type annotations for static type checking, identifying potential errors before runtime, thus enhancing the development process.
5. **Support from Modern Libraries**: Libraries such as **FastAPI** and **Pydantic** leverage type annotations to provide functionalities like automatic data validation, schema generation, and comprehensive API documentation.
6. **Advantages of Typed Dataclasses Over Simple Data Structures**: Typed dataclasses improve readability, structured data handling, and type safety compared to dicts and tuples. They use attributes instead of string keys, which minimizes errors due to typos and improves code autocompletion. Dataclasses also provide clear definitions of data structures, support default values, and simplify code maintenance and debugging.
### Why Do We Need to Split the App Into Layers
Splitting an application into layers enhances maintainability, scalability, and flexibility. Key reasons for this strategy include:
#### Separation of concerns
- Each layer focuses on a specific aspect, which simplifies development, debugging and maintenance.
#### Reusability
- Layers can be reused in different parts of the application or in other projects. Code duplication is eliminated.
#### Scalability
- Allows different layers to scale independently of each other depending on needs.
#### Serviceability
- Simplifies maintenance by localizing common functions in separate layers.
#### Improved collaboration
- Teams can work on different layers independently.
#### Flexibility and adaptability
- Changes in technology or design can be implemented in specific layers. Only the affected layers need to be adapted, the others remain unaffected.
#### Testability
- Each layer can be tested independently, simplifying unit testing and debugging.
Adopting a layered architecture offers significant advantages in development speed, operational management, and long-term maintenance, making systems more robust, manageable, and adaptable to change.
### Global Constants vs Injected Parameters
When developing software, the choice between using global constants and employing dependency injection (DI) can significantly impact the flexibility, maintainability, and scalability of applications. This analysis delves into the drawbacks of global constants and contrasts them with the advantages provided by dependency injection.
#### Global Constants
1. **Fixed Configuration**: Global constants are static and cannot dynamically adapt to different environments or requirements without modifying the codebase. This rigidity limits their utility across diverse operational scenarios.
2. **Limited Testing Scope**: Testing becomes challenging with global constants as they are not easily overridden. Developers might need to alter the global state or employ complex workarounds to accommodate different test scenarios, thereby increasing the risk of errors.
3. **Reduced Modularity**: Relying on global constants decreases modularity since components become dependent on specific values being set globally. This dependence reduces the reusability of components across different projects or contexts.
4. **Tight Coupling**: Global constants integrate specific behaviors and configurations directly into the codebase, making it difficult to adapt or evolve the application without extensive modifications.
5. **Hidden Dependencies**: Similar to global variables, global constants obscure the dependencies within an application. It becomes unclear which parts of the system rely on these constants, complicating both the understanding and the maintenance of the code.
6. **Namespace Pollution and Scalability Challenges**: Global constants can clutter the namespace and complicate the scaling of applications. They promote a design that isn't modular, hindering efficient distribution across different processes.
7. **Maintenance and Refactoring Difficulties**: Over time, the use of global constants can lead to maintenance challenges. Refactoring such a codebase is risky as changes to the constants might inadvertently affect disparate parts of the application.
8. **Module-Level State Duplication**: In Python, module-level code might be executed multiple times if imports occur under different paths (e.g., absolute vs. relative). This can lead to duplication of global instances and hard-to-track maintenance bugs, further complicating the application’s stability and predictability.
#### Injected Parameters
1. **Dynamic Flexibility and Configurability**: Dependency injection allows for the dynamic configuration of components, making applications adaptable to varying conditions without needing code changes.
2. **Enhanced Testability**: DI improves testability by enabling the injection of mock objects or alternative configurations during tests, effectively isolating components from external dependencies and ensuring more reliable test outcomes.
3. **Increased Modularity and Reusability**: Components become more modular and reusable as they are designed to operate with any injected parameters that conform to expected interfaces. This separation of concerns enhances the portability of components across various parts of an application or even different projects.
4. **Loose Coupling**: Injected parameters promote loose coupling by decoupling the system’s logic from its configuration. This approach facilitates easier updates and changes to the application.
5. **Explicit Dependency Declaration**: With DI, components clearly declare their dependencies, typically through constructor parameters or setters. This clarity makes the system easier to understand, maintain, and extend.
6. **Scalability and Complexity Management**: As applications grow, DI helps manage complexity by localizing concerns and separating configuration from usage, aiding in the effective scaling and maintenance of large systems.
### Procedural vs OOP
Using Object-Oriented Programming (OOP) and Dependency Injection (DI) can significantly enhance code quality and maintainability compared to a procedural approach with global variables and functions. Here's a simple comparison that demonstrates these advantages:
#### Procedural Approach: Global Variables and Functions
```python
# Global configuration
database_config = {
'host': 'localhost',
'port': 3306,
'user': 'user',
'password': 'pass'
}
def connect_to_database():
print(f"Connecting to database on {database_config['host']}...")
# Assume connection is made
return "database_connection"
def fetch_user(database_connection, user_id):
print(f"Fetching user {user_id} using {database_connection}")
# Fetch user logic
return {'id': user_id, 'name': 'John Doe'}
# Usage
db_connection = connect_to_database()
user = fetch_user(db_connection, 1)
```
- **Code Duplication**: `database_config` must be passed around or accessed globally in multiple functions.
- **Testing Difficulty**: Mocking the database connection or configuration involves manipulating global state, which is error-prone.
- **Tight Coupling**: Functions directly depend on global state and specific implementations.
#### OOP + DI Approach
```python
from typing import Dict, Optional
from abc import ABC, abstractmethod
class DatabaseConnection(ABC):
@abstractmethod
def connect(self):
pass
@abstractmethod
def fetch_user(self, user_id: int) -> Dict:
pass
class MySQLConnection(DatabaseConnection):
def __init__(self, config: Dict[str, str]):
self.config = config
def connect(self):
print(f"Connecting to MySQL database on {self.config['host']}...")
# Assume connection is made
def fetch_user(self, user_id: int) -> Dict:
print(f"Fetching user {user_id} from MySQL")
return {'id': user_id, 'name': 'John Doe'}
class UserService:
def __init__(self, db_connection: DatabaseConnection):
self.db_connection = db_connection
def get_user(self, user_id: int) -> Dict:
return self.db_connection.fetch_user(user_id)
# Configuration and DI
config = {
'host': 'localhost',
'port': 3306,
'user': 'user',
'password': 'pass'
}
db = MySQLConnection(config)
db.connect()
user_service = UserService(db)
user = user_service.get_user(1)
```
- **Reduced Code Duplication**: The database configuration is encapsulated within the connection object; no need to pass it around.
- **DI Possibilities**: Easily switch out `MySQLConnection` with another database connection class without changing `UserService` code.
- **Encapsulation and Abstraction**: Implementation details of how users are fetched or how the database is connected are hidden away.
- **Ease of Mocking and Testing**: `UserService` can be easily tested by injecting a mock or stub of `DatabaseConnection`.
- **Object Lifetime Management**: The lifecycle of database connections can be managed more granularly (e.g., using context managers).
- **Use of OOP Principles**: Demonstrates inheritance (abstract base class), polymorphism (implementing abstract methods), and protocols (interfaces defined by `DatabaseConnection`).
By structuring the application using OOP and DI, the code becomes more modular, easier to test, and flexible to changes, such as swapping out dependencies or changing configurations.
## Building the App
You can find all examples and more details with comments at the [repo](https://github.com/MarkParker5/python-app-architecture-demo)
### Starting a new Project
Just a short check-list:
#### 1. Project and Dependency Management with Poetry
Poetry shines not only as a project creation tool but also excels in managing dependencies and virtual environments. Start by setting up your project structure using the following command:
```bash
poetry new python-app-architecture-demo
```
This command crafts a well-organized directory structure: separate folders for Python code and tests, with a root directory for meta-information like `pyproject.toml`, lock files, and git configurations.
#### 2. Version Control with Git
Initialize Git in your project directory:
```bash
git init
```
Add a `.gitignore` file to exclude unnecessary files from your repository. Use the standard Python `.gitignore` provided by GitHub, and append any specific exclusions like `.DS_Store` for macOS or IDE configs (`.idea`, `.vscode`, `.zed`, etc):
```bash
wget -O .gitignore https://raw.githubusercontent.com/github/gitignore/main/Python.gitignore
```
```bash
echo .DS_Store >> .gitignore
```
#### 3. Manage Dependencies
Install your project’s dependencies using Poetry:
```bash
poetry add fastapi pytest aiogram
```
You can install all dependencies later using:
```bash
poetry install
```
Refer to the official documentation of each library if you need more specific instructions.
#### 4. Configuration Files
Create a `config.py` file to centralize your application settings—a common and effective approach.
Set environment variables for secrets and parameters:
```bash
touch .env example.env
```
`.env` contains sensitive data and should be git-ignored, while `example.env` holds placeholder or default values and is checked into the repository.
#### 5. Application Entry Point
Define the entry point of your application in `main.py`:
*python_app_architecture/main.py:*
```python
def run():
print('Hello, World!')
if __name__ == '__main__': # avoid run on import
run()
```
Make your project usable as a library and allow programmatic access by importing the `run` function in the `__init__.py`:
*python_app_architecture/__init__.py*
```python
from .main import run
```
Enable direct project execution with Poetry by adding a shortcut in `__main__.py`. This allows you to use the command `poetry run python python_app_architecture` instead of the longer `poetry run python python_app_architecture/main.py`.
*python_app_architecture/__main__.py:*
```python
from .main import run
run()
```
### Defining Directories and Layers
> **Disclaimer:**
> *Of course, every application is different and their architecture will differ depending on the goals and objectives. I'm not saying that this is the only correct option, but I think that this one is fairly average and suitable for a big part of projects. Try to focus on main approaches and ideas rather than specific examples.*
Now, let's setup directories for different layers of the application.
Typically, it's wise to version your API (e.g., by creating subdirectories like `api/v1`), but we'll keep things simple for now and omit this step.
```
.
├── python_app_architecture_demo
│ ├── coordinator.py
│ ├── entities
│ ├── general
│ ├── mappers
│ ├── providers
│ ├── repository
│ │ └── models
│ └── services
│ ├── api_service
│ │ └── api
│ │ ├── dependencies
│ │ ├── endpoints
│ │ └── schemas
│ └── telegram_service
└── tests
```
- **The App**
- **Entities** — App-wide data structures. Purely carriers of data with no embedded logic.
- **General** — The utility belt! A consolidated hub for shared utilities, helpers, and library facades.
- **Mappers** — Specialists in data translation, converting between data forms like database models to entities or between different data formats. It's good practice to encapsulate mappers to its usage boundary instead of making them global. For example, models-entities mapper may be part of the repository module. Another example: schemas-entities mapper must stay inside api service and be its private tool.
- **Providers** — The backbone of core business logic. Providers implement the main logic of the application but remain agnostic of the interface details, ensuring their operations are abstract and isolated.
- **Repository** — The librarians. Custodians of data access, abstracting the complexities of data source interactions through models, thus isolating database operations from the broader app.
- **Models** — Definitions of local data structures interacting with the database, distinct and isolated from Entities.
- **Services** — Each service acts as a (almost) standalone sub-application, orchestrating its specific domain of business logic while delegating foundational tasks to providers. This configuration ensures centralized and uniform application-wide logic
- **API Service** — Manages external communications via HTTP/S, structured around a FastAPI framework.
- **Dependencies** — Essential tools and helpers required by various parts of your API, integrated via FastAPI’s DI system.
- **Endpoints** — Routes that publicly expose your business logic via HTTP.
- **Schemas** — Data structure definitions for API inputs and outputs, confined to their service layer to maintain encapsulation.
- **Telegram Service** — Operates similarly to the API Service, providing functionality via Telegram without replicating the core business logic. This is achieved by calling the same providers that API Service uses, ensuring consistency and reducing code redundancy.
- **Tests** — Dedicated solely to testing, this directory contains all test code, maintaining a clear separation from application logic.
The connection between layers will look something like this:
Note that *entities* are not active components, but only data structures that are passed between layers:
Keep in mind that layers are not directly connected, but only depend on abstractions. Implementations are passed using dependency injection:
This flexible structure allows you to easily add functionality, for example, change the database, create a service, or connect a new interface without extra changes or code duplication, because logic of each module is located on its own layer:
At the same time, all logic of a separate service is encapsulated within it:
### Exploring the Code
#### Endpoint
Let's start from the endpoint:
```python
# api_service/api/endpoints/user.py
from typing import Annotated
from fastapi import APIRouter, Depends, HTTPException, status
from entities.user import UserCreate
from ..dependencies.providers import (
user_provider, # 1
UserProvider # 2
)
router = APIRouter()
@router.post("/register")
async def register(
user: UserCreate, # 3
provider: Annotated[UserProvider, Depends(user_provider)] # 4
):
provider.create_user(user) # 5
return {"message": "User created!"}
```
1. Importing dependency injection helper function (we will look at it in a minute)
2. Importing UserProvider **protocol** for type annotation
3. Endpoint requires the request's body to have `UserCreate` scheme in json format
4. The `provider` parameter in the `register` function is an instance of implementation of `UserProvider`, injected by FastAPI using the `Depends` mechanism.
5. The `create_user` method of the `UserProvider` is called with the parsed user data. This demonstrates a clear separation of concerns, where the API layer delegates business logic to the provider layer, adhering to the principle that interface layers should not contain business logic.
#### UserProvider
Now, let's see the business logic:
```python
# providers/user_provider.py
from typing import Protocol, runtime_checkable, Callable
from typing_extensions import runtime_checkable
from repository import UserRepository
from providers.mail_provider import MailProvider
from entities.user import UserCreate
@runtime_checkable
class UserProvider(Protocol): # 1
def create_user(self, user: UserCreate): ...
@runtime_checkable
class UserProviderOutput(Protocol): # 2
def user_provider_created_user(self, provider: UserProvider, user: UserCreate): ...
class UserProviderImpl: # 3
def __init__(self,
repository: UserRepository, # 4
mail_provider: MailProvider, # 4
output: UserProviderOutput | None, # 5
on_user_created: Callable[[UserCreate], None] | None # 6
):
self.repository = repository
self.mail_provider = mail_provider
self.output = output
self.on_user_created = on_user_created
# Implementation
def create_user(self, user: UserCreate): # 7
self.repository.add_user(user) # 8
self.mail_provider.send_mail(user.email, f"Welcome, {user.name}!") # 9
if output := self.output: # unwraping the optional
output.user_provider_created_user(self, user) # 10
# 11
if on_user_created := self.on_user_created:
on_user_created(user)
```
1. **Defining the Interface**: `UserProvider` is a protocol that specifies the method `create_user`, which any class adhering to this protocol must implement. It serves as a formal contract for user creation functionality.
2. **Observer Protocol**: `UserProviderOutput` serves as an observer (or delegate) that is notified when a user is created. This protocol enables loose coupling and enhances the event-driven architecture of the application.
3. **Protocol Implementation**: `UserProviderImpl` implements the user creation logic but does not need to explicitly declare its adherence to `UserProvider` due to Python's dynamic nature and the use of duck typing.
4. **Core Dependencies**: The constructor accepts `UserRepository` and `MailProvider`—both defined as protocols—as parameters. By relying solely on these protocols, the `UserProviderImpl` remains decoupled from specific implementations, illustrating the principles of Dependency Injection where the provider is agnostic of the underlying details, interfacing only through defined contracts.
5. **Optional Output Delegate**: The constructor accepts an optional `UserProviderOutput` instance, which, if provided, will be notified upon the completion of user creation.
6. **Callback Function**: As an alternative to the output delegate, a callable `on_user_created` can be passed to handle additional actions post-user creation, providing flexibility in response to events.
7. **Central Business Logic**: The `create_user` method encapsulates the main business logic for adding a user, demonstrating separation from API handling.
8. **Repository Interaction**: Utilizes the `UserRepository` to abstract the database operations (e.g., adding a user), ensuring the provider does not directly manipulate the database.
9. **Extended Business Logic**: Involves sending an email through `MailProvider`, illustrating that the provider's responsibilities can extend beyond simple CRUD operations.
10. **Event Notification**: If an output delegate is provided, it notifies this delegate about the user creation event, leveraging the observer pattern for enhanced interactivity and modular reactions to events.
11. **Callback Execution**: Optionally executes a callback function, providing a straightforward method to extend functionality without complex class hierarchies or dependencies.
#### FastAPI Dependencies
Ok, but how to instantiate the provider and inject it? Let's take a look at the injection code, powered by FastAPI's DI engine:
```python
# services/api_service/api/dependencies/providers.py
from typing import Annotated
from fastapi import Request, Depends
from repository import UserRepository
from providers.user_provider import UserProvider, UserProviderImpl
from providers.mail_provider import MailProvider
from coordinator import Coordinator
from .database import get_session, Session
import config
def _get_coordinator(request: Request) -> Coordinator:
# private helper function
# NOTE: You can pass the DIContainer in the same way
return request.app.state.coordinator
def user_provider(
session: Annotated[Session, Depends(get_session)], # 1
coordinator: Annotated[Coordinator, Depends(_get_coordinator)] # 2
) -> UserProvider: # 3
# UserProvider's lifecycle is bound to short endpoint's lifecycle, so it's safe to use strong references here
return UserProviderImpl( # 4
repository=UserRepository(session), # 5
mail_provider=MailProvider(config.mail_token), # 6
output=coordinator, # 7
on_user_created=coordinator.on_user_created # 8
# on_user_created: lambda: coordinator.on_user_created() # add a lambda if the method's signature is not compatible
)
```
1. Getting a database session through FastAPI's dependency injection system, ensuring that each request has a clean session.
2. Obtaining an instance of `Coordinator` from the application state, which is responsible for managing broader application-level tasks and acting as an event manager.
3. Note: the function returns protocol but not the exact implementation
4. Constructing an instance of `UserProviderImpl` by injecting all the necessary dependencies. This demonstrates a practical application of dependency injection to assemble complex objects.
5. Initializing `UserRepository` with the session obtained from FastAPI's DI system. This repository handles all data persistence operations, abstracting the database interactions from the provider.
6. Setting up `MailProvider` using a configuration token.
7. Injecting `Coordinator` as the output protocol. This assumes that `Coordinator` implements the `UserProviderOutput` protocol, allowing it to receive notifications when a user is created.
8. Assigns a method from `Coordinator` as a callback to be executed upon user creation. This allows for additional operations or notifications to be triggered as a side effect of the user creation process.
This structured approach ensures that the `UserProvider` is equipped with all necessary tools to perform its tasks effectively, while adhering to the principles of loose coupling and high cohesion.
#### Coordinator
The Coordinator class acts as the main orchestrator within your application, managing various services, interactions, events, setting the initial state, and injecting dependencies. Here's a detailed breakdown of its roles and functionalities based on the provided code:
```python
# coordinator.py
from threading import Thread
import weakref
import uvicorn
import config
from services.api_service import get_app as get_fastapi_app
from entities.user import UserCreate
from repository.user_repository import UserRepository
from providers.mail_provider import MailProvider
from providers.user_provider import UserProvider, UserProviderImpl
from services.report_service import ReportService
from services.telegram_service import TelegramService
class Coordinator:
def __init__(self):
self.users_count = 0 # 1
self.telegram_service = TelegramService( # 2
token=config.telegram_token,
get_user_provider=lambda session: UserProviderImpl(
repository=UserRepository(session),
mail_provider=MailProvider(config.mail_token),
output=self,
on_user_created=self.on_user_created
)
)
self.report_service = ReportService(
get_users_count = lambda: self.users_count # 3
)
# Coordinator's Interface
def setup_initial_state(self):
fastapi_app = get_fastapi_app()
fastapi_app.state.coordinator = self # 4
# 5
fastapi_thread = Thread(target=lambda: uvicorn.run(fastapi_app))
fastapi_thread.start()
# 6
self.report_service.start()
self.telegram_service.start()
# UserProviderOutput Protocol Implementation
def user_provider_created_user(self, provider: UserProvider, user: UserCreate):
self.on_user_created(user)
# Event handlers
def on_user_created(self, user):
print("User created: ", user)
self.users_count += 1
# 7
if self.users_count >= 10_000:
self.report_service.interval_seconds *= 10
elif self.users_count >= 10_000_000:
self.report_service.stop() # 8
```
1. Some state can be shared between different providers, services, layers, and the entire app
2. Assembling implementations and injecting dependencies
3. Be aware of circular references, deadlocks, and memory leaks here, see [the full code]( https://github.com/MarkParker5/python-app-architecture-demo) for detatils
4. Pass the coordinator instance to the FastAPI app state so you can access it in the endpoints via FastAPI's DI system
5. Start all services in separate threads
6. Already runs in a separate thread inside the service
7. Some cross-service logic here, just for example
8. Example of controlling services from the coordinator
This orchestrator centralizes control and communication between different components, enhancing manageability and scalability of the application. It effectively coordinates actions across services, ensuring that the application responds appropriately to state changes and user interactions. This design pattern is crucial for maintaining a clean separation of concerns and enabling more robust and flexible application behavior.
#### DI Container
However, in large-scale applications manual DI can lead to a significant amount of boilerplate code. This is when DI Container comes to rescue. DI Containers, or Dependency Injection Containers, are powerful tools used in software development to manage dependencies within an application. They serve as a central location where objects and their dependencies are registered and managed. When an object requires a dependency, the DI Container automatically handles the instantiation and provision of these dependencies, ensuring that objects receive all the necessary components to function effectively. This approach promotes loose coupling, enhances testability, and improves the overall maintainability of the codebase by abstracting the complex logic of dependency management away from the business logic of the application. DI Containers simplify the development process by automating and centralizing the configuration of component dependencies.
For python, there are many libraries providing different DI Container implementations, I looked almost all of them and wrote down the best IMO
- [python-dependency-injector](https://python-dependency-injector.ets-labs.org/introduction/di_in_python.html) — automated, class-based, has different lifecycle options like Singleton or Factory
- [lagom](https://lagom-di.readthedocs.io/en/latest/) — a dictionary interface with automatic resolve
- [dishka](https://github.com/reagento/dishka) — good scope control via context manager
- [that-depends](https://github.com/modern-python/that-depends) — support for context managers (objects required to be closed in the end), native fastapi integration
- [punq](https://github.com/bobthemighty/punq) — more classic approach with `register` and `resolve` methods
- [rodi](https://github.com/Neoteroi/rodi) — classic, simple, automatic
#### main.py
For the end, let's update the main.py file:
```python
# main.py
from coordinator import Coordinator
def run(): # entry point, no logic here, only run the coordinator
coordinator = Coordinator()
coordinator.setup_initial_state()
if __name__ == '__main__':
run()
```
## Conclusion
To gain a comprehensive understanding of the architectural and implementation strategies discussed, it is beneficial to review all files in the [repository](https://github.com/MarkParker5/python-app-architecture-demo). Despite the limited amount of code, each file is enriched with insightful comments and additional details that offer a deeper understanding of the application’s structure and functionality. Exploring these aspects will enhance your familiarity with the system, ensuring you are well-equipped to adapt or expand the application effectively.
This approach is universally beneficial across various Python applications. It's effective for stateless backend servers such as those built with FastAPI, but its advantages are particularly pronounced in no-framework apps and applications that manage state. This includes desktop applications (both GUI and command-line), as well as systems that control physical devices like IoT devices, robotics, drones, and other hardware-centric technologies.
Additionally, I highly recommend reading *Clean Code* by Robert Martin for further enrichment. You can find a summary and key takeaways [here](https://gist.github.com/MarkParker5/6f47112b73d695127cdf5447213f3bb4). This resource will provide you with foundational principles and practices that are crucial for maintaining high standards in software development.
| markparker5 |
1,868,157 | Javascript behind the scenes | Hello Everyone, السلام عليكم و رحمة الله و بركاته JavaScript is a powerful and dynamic language... | 0 | 2024-05-28T21:55:04 | https://dev.to/bilelsalemdev/javascript-behind-the-scenes-35og | javascript, webdev, algorithms, performance | Hello Everyone, السلام عليكم و رحمة الله و بركاته
JavaScript is a powerful and dynamic language widely used for web development. Its performance and capabilities are large due to the sophisticated architecture and runtime environment that execute JavaScript code. Let's delve into the main components behind the scenes including the V8 engine, the event loop, the heap, the queue, and the call stack.
### V8 Engine
The V8 engine is an open-source JavaScript engine developed by Google. It is used in Chrome and Node.js, providing high performance by converting JavaScript code directly into machine code rather than interpreting it. Here are some key features of the V8 engine:
1. **Just-In-Time (JIT) Compilation**: V8 uses JIT compilation to enhance performance. It compiles JavaScript code into machine code at runtime, allowing it to execute much faster than interpreted code.
2. **Garbage Collection**: V8 includes an efficient garbage collector that automatically frees up memory that is no longer needed, preventing memory leaks and optimizing resource usage.
3. **Optimization**: V8 performs various optimizations during the execution of JavaScript code, such as inline caching, hidden classes, and function inlining, which significantly boost performance.
### Event Loop
The event loop is a fundamental concept in JavaScript, crucial for managing asynchronous operations. JavaScript is single-threaded, meaning it executes one piece of code at a time. The event loop allows JavaScript to handle non-blocking operations efficiently. Here’s how it works:
1. **Call Stack**: The call stack is a data structure that keeps track of function calls. When a function is invoked, it is pushed onto the stack. When it completes, it is popped off the stack.
2. **Task Queue**: Also known as the callback queue, this is where asynchronous tasks (like setTimeout callbacks, network requests, etc.) are queued. When the call stack is empty, the event loop takes the first task from the queue and pushes it onto the stack for execution.
3. **Microtask Queue**: This queue handles promises and other microtasks. It has a higher priority than the task queue, meaning the event loop will process all microtasks before moving on to tasks in the task queue.
### Heap
The heap is a memory structure used for dynamic memory allocation. Objects, arrays, and other reference types are allocated in the heap. The V8 garbage collector manages the heap, ensuring that unused memory is reclaimed and the application doesn't run out of memory.
### Queue
JavaScript has two main types of queues to handle different kinds of asynchronous tasks:
1. **Task Queue (Macro Task Queue)**: This queue handles tasks like setTimeout, setInterval, and I/O operations. When the event loop finds the call stack empty, it picks the next task from the task queue and executes it.
2. **Microtask Queue**: This queue is for microtasks such as promise callbacks and process.nextTick() (in Node.js). Microtasks are given higher priority and are executed before the next rendering or macro task.
### Stack
The call stack is an essential part of JavaScript's execution model:
1. **Push and Pop Operations**: Functions are pushed onto the call stack when called and popped off when they return.
2. **Synchronous Execution**: The call stack ensures that JavaScript code runs synchronously, meaning one function executes at a time until completion.
### Behind the Scenes Workflow
1. **Execution Context**: When JavaScript code runs, an execution context is created. This context contains the code that will be executed, the variables, and references to the outer environment.
2. **Global Execution Context**: This is the default context where the code starts executing.
3. **Function Execution Context**: Each time a function is invoked, a new execution context is created for that function.
4. **Hoisting**: Variable and function declarations are hoisted to the top of their containing scope during the creation phase of the execution context, allowing for their use before they are defined in the code.
5. **Scope Chain**: Each execution context has access to its own variables and those in its outer environment through the scope chain, which ensures proper variable lookup.
### Summary
The V8 engine, event loop, heap, queue, and stack are crucial components of the JavaScript runtime environment. They work together to handle synchronous and asynchronous operations efficiently, manage memory, and ensure smooth execution of JavaScript code. Understanding these behind-the-scenes mechanisms is key to writing efficient and high-performance JavaScript applications. | bilelsalemdev |
1,868,156 | My first ever company meeting. | Hey everyone! So, today was my very first meeting with a real business team. Yep, I'm just a... | 0 | 2024-05-28T21:54:10 | https://dev.to/angeljrp/my-first-ever-business-meeting-1kjl | Hey everyone! So, today was my very first meeting with a real business team. Yep, I'm just a 14-year-old guy in high school, and I landed an internship at a game developer company. Pretty cool, right?
At first, I was super nervous. I mean, who wouldn't be, right? It's like stepping into a whole new world. But you know what? The team was really supportive. They told me it's totally okay to mess up sometimes. Phew, that took a load off my shoulders!
I got to introduce myself, which was pretty cool. Then, I showed them a demo of a video game I've been working on it was kinda funny though, because we had some trouble sharing my screen at first. But hey, we fixed it pretty quickly!(btw here's a link to my demo: [A Knight's Adventure](https://angeljrp.itch.io/aknightsadventure))
I talked about my game, all its cool mechanics, how it works—you know, the whole deal. And then, it was the other new member's turn. He showed off his game demo too. It was really cool to see all these different ideas in one room!
After that, one of the team members filled me in on the story behind the games they're making. It's pretty neat how they all connect together. I gotta say, I learned a lot in just one meeting.
And get this, at the end, they invited me to join their GitHub and chats. How awesome is that? I feel like a real part of the team now!
So yeah, that was my first business meeting adventure. It was quite the experience, full of new faces, exciting discussions, and valuable insights into the world of game development. I'm eager to dive even deeper into this journey and discover all the amazing opportunities that lie ahead as part of this incredible team! | angeljrp | |
1,868,153 | Ingredientes prejudiciais a evitar em produtos de beleza: Um guia para iniciantes | A beleza natural é um tesouro que todos desejam preservar. No entanto, muitas vezes, sem saber,... | 0 | 2024-05-28T21:50:11 | https://dev.to/vidacomartesanato/ingredientes-prejudiciais-a-evitar-em-produtos-de-beleza-um-guia-para-iniciantes-133p | beleza, produtosdebeleza, ingredientesprejudiciais |
A beleza natural é um tesouro que todos desejam preservar.
No entanto, muitas vezes, sem saber, aplicamos produtos que contêm ingredientes prejudiciais que podem comprometer nossa saúde dermatológica.
É essencial conhecer os componentes dos produtos que usamos diariamente para evitar reações adversas e manter a pele e o cabelo saudáveis.
No primeiro passo desta jornada, é importante entender que a pele, nosso maior órgão, absorve grande parte do que colocamos nela.
Portanto, ingredientes como; **parabenos** e **sulfatos**, frequentemente encontrados em [cosméticos](https://pt.wikipedia.org/wiki/Cosm%C3%A9tico), devem ser evitados, pois podem causar irritações e outros problemas a longo prazo.
Além disso, para aqueles que têm condições específicas da pele, como psoríase ou melasma, a atenção deve ser redobrada.
Ingredientes como álcool e fragrâncias artificiais podem agravar essas condições, tornando o cuidado com a seleção de produtos ainda mais crucial.
Por certo, a escolha consciente de produtos de beleza não apenas beneficia a saúde da pele, mas também reflete um compromisso com o bem-estar geral.
Ao evitar ingredientes prejudiciais, abrimos caminho para uma rotina de beleza mais sustentável e responsável.
Portanto, nesta seção, exploraremos os ingredientes que devem ser mantidos longe de nossos armários de beleza.
Com esta informação, você poderá fazer escolhas mais informadas e seguras, garantindo que sua rotina de beleza contribua para a saúde e a vitalidade da sua pele e cabelo.
## Protegendo Sua Pele: Ingredientes Prejudiciais que Você Deve Evitar:
Ao escolher produtos de beleza, é fundamental estar ciente dos ingredientes prejudiciais que podem afetar condições específicas da pele.
Para quem tem dermatite, por exemplo, é essencial evitar fragrâncias e conservantes artificiais, que são comuns em muitos cosméticos e podem exacerbar a sensibilidade da pele.
Certamente, ao se informar e selecionar cuidadosamente os produtos, você estará não apenas protegendo sua pele, mas também investindo em sua saúde a longo prazo.
Portanto, lembre-se de verificar os rótulos e escolher opções mais seguras e benéficas para o seu tipo de pele.
## Cuidados Especiais para Pele com Psoríase:
A psoríase requer atenção especial quando se trata de produtos de beleza.
Evite ingredientes como álcool denat e lauril sulfato de sódio, que podem desencadear inflamação e irritação.
Opte por produtos com hidratantes naturais e calmantes, como aloe vera e manteiga de karité, que ajudam a manter a pele nutrida e suave.
## Melasma e os Riscos dos Agentes Clareadores:
Para quem lida com melasma, é crucial evitar agentes clareadores agressivos como; **hidroquinona e mercúrio**, que podem causar mais danos do que benefícios.
Em vez disso, busque ingredientes gentis que protejam a pele e previnam a hiperpigmentação, como vitamina C e ácido azelaico.
## Vitiligo e a Importância da Proteção Solar:
Quem tem vitiligo deve ser extremamente cuidadoso com a exposição solar.
Produtos com oxibenzona e avobenzona podem ser irritantes; portanto, prefira filtros solares minerais com óxido de zinco ou dióxido de titânio, que oferecem proteção sem riscos adicionais.
## Navegando pela Beleza: Evite Estes Ingredientes Se Você Tem Acne ou Cabelos Oleosos:
Para aqueles com cabelos oleosos, a escolha do shampoo e condicionador é fundamental.
Ingredientes como sulfatos fortes podem remover os óleos naturais do couro cabeludo, levando a uma produção excessiva de óleo como resposta. Shampoos suaves com agentes de limpeza derivados de coco podem limpar sem agredir.
Além disso, evitar produtos com silicones pesados que podem deixar resíduos e contribuir para a oleosidade é uma boa prática.
Ao compreender os ingredientes prejudiciais a evitar em produtos de beleza, você estará tomando uma atitude proativa em relação à saúde da sua pele e cabelo.
A leitura atenta dos rótulos e a escolha de produtos alinhados com as necessidades específicas do seu tipo de pele e cabelo são passos importantes para uma rotina de beleza saudável e consciente.
## Acne Rosácea:
Ingredientes a Evitar A acne rosácea pode ser um desafio diário, e a escolha dos produtos de beleza certos é crucial.
Ingredientes como álcool e fragrâncias sintéticas são conhecidos por agravar a vermelhidão e a irritação.
Além disso, conservantes como parabenos e liberadores de formaldeído podem desencadear surtos.
É preferível optar por produtos formulados para peles sensíveis, que contenham ingredientes calmantes como niacinamida e extrato de chá verde, que ajudam a reduzir a inflamação e acalmar a pele.
## Acne Vulgar:
Escolhas Seguras A acne vulgar requer uma abordagem cuidadosa na seleção de produtos de beleza.
Óleos pesados e silicones em maquiagens e hidratantes podem obstruir os poros e piorar a condição.
Produtos não comedogênicos são essenciais, pois ajudam a manter os poros limpos.
Ingredientes como ácido salicílico e peróxido de benzoíla podem ser benéficos, mas devem ser usados com moderação para evitar secar excessivamente a pele.
## Acne Cística:
Cuidado com Ingredientes Oclusivos A acne cística, sendo uma forma mais severa de acne, exige uma seleção ainda mais criteriosa de produtos.
Ingredientes oclusivos como petrolato e óleo mineral podem ser particularmente problemáticos, pois criam uma barreira que pode bloquear os poros e agravar as lesões.
É importante buscar produtos que contenham ácidos como o glicólico ou o lático, que ajudam na renovação celular e na prevenção de bloqueios nos poros.
## Cabelos Secos:
Fique Longe Destes Ingredientes. pois, Cuidar de cabelos secos significa evitar ingredientes que possam retirar ainda mais a umidade natural dos fios.
Sulfatos fortes, como lauril sulfato de sódio, são conhecidos por sua ação detergente intensa, que pode deixar os cabelos ressecados e quebradiços.
Além disso, o álcool presente em muitos produtos de styling pode exacerbar a secura.
Prefira produtos que contenham ingredientes hidratantes como glicerina e ácido hialurônico, que ajudam a reter a umidade e manter os cabelos saudáveis.
## Cabelos Danificados:
Evite Estes Vilões Cabelos danificados precisam de cuidados especiais para evitar ingredientes que possam causar mais danos.
Evite produtos com parabenos e ftalatos, que podem ser prejudiciais ao couro cabeludo e aos fios.
Silicones insolúveis também devem ser evitados, pois podem acumular-se no cabelo e impedir a penetração de hidratantes.
Busque produtos enriquecidos com proteínas e aminoácidos, que ajudam a reparar a fibra capilar e fortalecer os cabelos.
## Cabelos Grossos:
Ingredientes que Não Fazem Bem Cabelos grossos podem parecer fortes, mas ainda assim são suscetíveis a ingredientes nocivos.
Produtos com altas concentrações de detergentes fortes podem desgastar a cutícula do cabelo, enquanto óleos minerais e petrolatos podem pesar e sufocar os fios.
Opte por produtos que contenham óleos naturais e manteigas, que nutrem os cabelos sem comprometer sua saúde.
##
Conclusão: Realçando a Beleza Natural com uma Rotina Consciente:
## Implementação Diária das Dicas:
Incorporar as dicas de produtos seguros em sua rotina diária é mais fácil do que parece.
Comece substituindo itens que contêm ingredientes prejudiciais por alternativas mais saudáveis gradualmente.
Isso não apenas protege sua pele e cabelo, mas também lhe dá a chance de descobrir novos favoritos que se alinham com seu compromisso com a beleza consciente.
## O Impacto de Escolhas Conscientes:
Escolher produtos livres de ingredientes nocivos tem um impacto positivo não só na sua saúde, mas também no meio ambiente.
Ao evitar certos químicos, você contribui para a demanda por práticas de fabricação mais sustentáveis e éticas.
## A Jornada para uma Beleza Sustentável:
A jornada para uma rotina de beleza consciente é contínua e sempre evolutiva.
Mantenha-se informado sobre os ingredientes prejudiciais a evitar em produtos de beleza e esteja aberto a experimentar novas soluções que possam surgir no mercado.
## Conteúdo: Adotar uma rotina de beleza consciente é um passo significativo para o cuidado pessoal.
Ao implementar essas dicas em sua vida diária, você não só verá melhorias na saúde da sua pele e cabelo, mas também sentirá a satisfação de fazer escolhas que refletem seus valores.
Portanto, encorajamos você a dar esse passo e a desfrutar dos benefícios de uma beleza que é verdadeiramente saudável e sustentável.
| vidacomartesanato |
1,868,152 | JavaScript | JavaScript Versions JavaScript DataTypes JavaScript kuchli turdagi... | 0 | 2024-05-28T21:42:14 | https://dev.to/mirabbos-dev/javascript-12bh | javascript, jsdatatypes, jsvariables | ## JavaScript Versions
## JavaScript DataTypes
JavaScript kuchli turdagi dasturlash tili bo'lib, uning o'ziga xos turdagi tizimi mavjud. JavaScriptda ma'lumot turlarini ikki asosiy guruhga bo'lish mumkin: primitiv (asosiy) turlar va murakkab turlar. Keling, ushbu turlarning har birini batafsil ko'rib chiqamiz.
**Primitiv ma'lumot turlari**
- Number. Number turi butun sonlar va o'nlik sonlarni o'z ichiga oladi.
```
let integer = 42;
let float = 3.14;
```
- String. String turi matnlarni ifodalaydi va qo'shtirnoq (" ") yoki bir tirnoq (' ') ichida yoziladi.
```
let greeting = "Hello, world!";
let name = 'John Doe';
```
- Boolean. Boolean turi faqat ikkita qiymatga ega: true yoki false.
```
let isJavaScriptFun = true;
let isJavaHard = false;
```
- Undefined. O'zgaruvchi e'lon qilingan, lekin unga qiymat berilmagan bo'lsa, uning qiymati undefined bo'ladi.
```
let x;
console.log(x); // undefined
```
- Null. Null qiymati hech qanday qiymat mavjud emasligini ifodalaydi. Bu o'zgaruvchiga qiymat berilmaganligini bildiradi.
```
let y = null;
```
- Symbol (ES6dan boshlab). Symbol turi noyob va o'zgarmas qiymatni ifodalaydi va ko'pincha ob'ekt kalitlari uchun ishlatiladi.
```
let sym1 = Symbol('description');
let sym2 = Symbol('description');
console.log(sym1 === sym2); // false
```
- BigInt (ES2020dan boshlab). BigInt juda katta butun sonlarni ifodalash uchun ishlatiladi va oxiriga n harfi qo'shiladi.
```
let bigNumber = 9007199254740991n;
```
**Nonprimitiv ma'lumot turlari**
- Object. Object turida bir nechta qiymatlar to'plami mavjud bo'lib, ular kalit-qiymat juftliklari shaklida saqlanadi.
```
let person = {
name: "Alice",
age: 25,
isStudent: true
};
```
- Array. Array turi ma'lumotlar ro'yxatini saqlaydi va elementlar indeks bo'yicha joylashadi.
```
let colors = ["red", "green", "blue"];
```
- Function. Function turi bajariladigan kod blokini ifodalaydi va parametrlar hamda qaytarish qiymati bo'lishi mumkin.
```
function greet(name) {
return "Hello, " + name + "!";
}
```
## Turini Aniqlash
**JavaScriptda o'zgaruvchining turini aniqlash uchun typeof operatoridan foydalaniladi:**
```
console.log(typeof 42); // "number"
console.log(typeof "Hello"); // "string"
console.log(typeof true); // "boolean"
console.log(typeof undefined); // "undefined"
console.log(typeof null); // "object" (bu eski xato, null aslida null turiga kiradi)
console.log(typeof Symbol("id")); // "symbol"
console.log(typeof 9007199254740991n); // "bigint"
console.log(typeof {}); // "object"
console.log(typeof []); // "object" (array ham object turiga kiradi)
console.log(typeof function(){}); // "function"
```
## JavaScript Variables (O'zgaruvchilar)
_JavaScript dasturlash tilida o'zgaruvchilar ma'lumotlarni saqlash va ularga murojaat qilish uchun ishlatiladi. O'zgaruvchilarni e'lon qilish va boshqarish JavaScript dasturining asosiy qismi hisoblanadi. Quyida JavaScript o'zgaruvchilarini e'lon qilish, turlari va ularni ishlatish usullari haqida batafsil ma'lumot beramiz._
O'zgaruvchilarni E'lon Qilish
- JavaScriptda o'zgaruvchilarni e'lon qilish uchun uchta asosiy kalit so'z mavjud: var, let, va const.
- var
- ES6 dan avval, var kalit so'zi o'zgaruvchilarni e'lon qilish uchun ishlatilgan. var blok ichidan ham chiqa oladi.
Misol:
```
var x = 10;
if (true) {
var x = 20;
console.log(x); // 20
}
console.log(x); // 20
```
- let
- ES6 bilan kiritilgan let kalit so'zi blokdan chiqa olmaydi. Bu esa o'zgaruvchining faqat blok ichida mavjudligini anglatadi.
Misol:
```
let y = 10;
if (true) {
let y = 20;
console.log(y); // 20
}
console.log(y); // 10
```
- const
- ES6 bilan kiritilgan const kalit so'zi ham blokdan chiqa olmaydi. const bilan e'lon qilingan o'zgaruvchining qiymati o'zgartirilmaydi.
Misol:
```
const z = 10;
// z = 20; // Xato: const o'zgaruvchining qiymatini o'zgartirish mumkin emas
```
| mirabbos-dev |
1,868,231 | An AI-generated song that sings Javascript Source Code | Developers sometimes describe their code as beautiful, unique, or flowing. Non-developers never had... | 0 | 2024-06-06T08:57:35 | https://brianchristner.io/an-ai-generated-song-using-javascript-as-the-text-of-the-song/ | ai, javascript, chatgpt | ---
title: An AI-generated song that sings Javascript Source Code
published: true
date: 2024-05-28 21:41:46 UTC
tags: AI, javascript,chatgpt
canonical_url: https://brianchristner.io/an-ai-generated-song-using-javascript-as-the-text-of-the-song/
---
Developers sometimes describe their code as beautiful, unique, or flowing. Non-developers never had the same appreciation. But have you ever had your code sing to you?
AI tools such as [https://suno.com/](https://suno.com/?ref=brianchristner.io) or [https://www.udio.com/](https://www.udio.com/?ref=brianchristner.io) make creating AI music extremely easy using text prompts. Prompt to music is now a thing.
What is I find incredible is taking every day text like MIT licesnes agreements, Blue Screen of Deaths (BSOD), or general computer errors and turning them into really great songs.
Here's a great example of taking Javascript and promting Suno to sing the Javascript like dubstep.
> Absolutely incredible. An AI-generated song using Javascript as the text of the song. - [https://t.co/ylXRHwv4jF](https://t.co/ylXRHwv4jF?ref=brianchristner.io)
>
> — Brian Christner (@idomyowntricks) [May 3, 2024](https://twitter.com/idomyowntricks/status/1786291679776903649?ref_src=twsrc%5Etfw&ref=brianchristner.io)
<script async src="https://platform.twitter.com/widgets.js" charset="utf-8"></script><!--kg-card-end: html-->
Another example, is using the MIT license and turning into 90's grunge music.
[MIT - Open Source Anthem by @sunnycover638 | Suno](https://suno.com/song/a4c5a8e2-0284-4234-ab04-8343b33b5219?ref=brianchristner.io)
How about adding Tango to your Access Viloation Error?
[ACCESS VIOLATION by @reversed | Suno](https://suno.com/song/e7bec6e6-83f2-412d-96ba-444c2f407b14?ref=brianchristner.io)
These are just some of the many interesting ways to use AI to generate new content and experiences. I encourage everyone to really experiment with these tools just to understand what is possible.
**FAQ Section: Exploring AI-Generated Music with JavaScript**
1. **What is AI-generated music and how is it created using JavaScript code?**
AI-generated music uses tools like [Suno](https://suno.com/?ref=brianchristner.io) or [Udio](https://www.udio.com/?ref=brianchristner.io) to convert text, including JavaScript code, into musical compositions, showcasing AI’s creative potential in music production.
1. **What are some examples of AI-generated songs featured on the blog?**
The blog features unique tracks like a dubstep song created from JavaScript code and a 90’s grunge song derived from an MIT license.
1. **How can AI-generated music be utilized for innovative content creation?**
It can create engaging and novel content for entertainment, education, and marketing by transforming everyday text into music.
1. **What tools are used to generate music from text like JavaScript code?**
Tools like Suno are used to convert text, including code, licenses, and error messages, into musical compositions.
1. **What is the significance of using AI to transform text into music?**
This innovative approach demonstrates the versatility of AI, offering new ways to engage audiences and explore the intersection of technology and creativity.
### Follow me
If you liked this article, [Follow Me](https://twitter.com/idomyowntricks?ref=brianchristner.io) on Twitter to stay updated! | vegasbrianc |
1,868,150 | Smooth Moves-Expert Furniture Movers at Your Service | Entrust your valuable furniture to the expert hands of our dedicated team. Whether you're moving... | 0 | 2024-05-28T21:26:36 | https://dev.to/colleen_shirley_bdb350af9/smooth-moves-expert-furniture-movers-at-your-service-155m | Entrust your valuable furniture to the expert hands of our dedicated team. Whether you're moving across town or across the country, our experienced professionals guarantee a seamless transition for your prized possessions. With meticulous care and precision, we handle every aspect of your furniture move, ensuring it arrives at its destination intact and on time.
The team understands that each piece of furniture holds sentimental and monetary value. That's why we employ the highest standards of safety and protection throughout the moving process. From delicate antiques to bulky couches, we treat every item with the utmost respect and attention it deserves, ensuring it remains in pristine condition from start to finish.
We pride ourselves on our reliability and efficiency, aiming to alleviate the stress and hassle often associated with furniture moving. Whether you're a homeowner, business owner, or interior designer, you can rely on us to deliver exceptional service tailored to your specific needs and requirements.
Experience the peace of mind that comes with choosing a trusted partner for your furniture moving needs. With our proven track record of customer satisfaction, you can rest assured that your furniture is in capable hands. Sit back, relax, and let us handle the heavy lifting while you focus on settling into your new space.
[More hints](https://capitalcitymoversabudhabi.com/furniture-movers-dubai/) | colleen_shirley_bdb350af9 | |
1,868,142 | React 19 example of the useOptimistic() hook | a really simple tutorial to get familiar with useOptimistic() hook | 18,357 | 2024-05-28T21:20:16 | https://dev.to/sensorario/react-19-example-of-new-useoptimistic-hook-27lf | react, canary | ---
title: React 19 example of the useOptimistic() hook
published: true
description: a really simple tutorial to get familiar with useOptimistic() hook
tags: react, canary
cover_image: https://dev-to-uploads.s3.amazonaws.com/uploads/articles/cfvvhanpr4lrp39nlnl7.png
series: react
---
## A working example
This post is related to this [example](https://github.com/sensorario/react-typescript-nextjs/tree/next/react/useOptimistic). You can see just the code or read this article that explain step by step what's happening in the little app.
## Create new react app
First of all create new React application. If you like vite, you can use the command below.
```bash
npm create vite@latest
```
## Experimental stuffs
Meanwhile I am writing the hook is still experimental. In the canary version of React 19 so... we need more packages to add the hook to the project.
```bash
npm install react@^0.0.0-experimental-6f23540c7d-20240528 \
react-dom@^0.0.0-experimental-6f23540c7d-20240528 \
uuid@^9.0.1 \
@types/react@18.3 \
@types/react-dom@18.3
```
## Import
The import is obviously...
```TypeScript
import { useOptimistic, useState } from "react";
```
## Data
In this example we will treat books. Because this example will be part of a book I am writing (italian only) about Reacct 19.
```TypeScript
type Book = { text: string; sending: boolean; key?: number };
```
## Rest call
At some point The little example will call some api. For simplicity I am simulating network delay with a Promise. Also, I simulate the the real call will update a value adding " content from rest api" like a rest api is returning data updated/filtered/fixed...
```TypeScript
const createNewBook = async (message: FormDataEntryValue | null) => {
await new Promise((resolve) => setTimeout(resolve, 1000));
return message + " content from rest api";
};
```
## App
Here we are!! The application contains a listo of books. React, TypeScript and Next.js is already written. React... is a working progress... The App create a list of books. A function that send data to an api and then add the result to the books.
```TypeScript
export default function App() {
const [books, setBooks] = useState<Book[]>([
{ text: "React", sending: false, key: 1 },
{ text: "React, TypeScript e Next.js", sending: false, key: 3 },
]);
async function sendMessage(formData: FormData) {
const sentMessage = await createNewBook(formData.get("message"));
setBooks((messages: any) => [...messages, { text: sentMessage }]);
}
return <Library books={books} createBook={sendMessage} />;
}
```
## Library
The main point of this article is the component `<Library />`. Let's take a step back. The data we are working with are book. And books are stored in this way:
```TypeScript
type Book = { text: string; sending: boolean; key?: number };
```
Whenever sending is true, `<small> (Sending...)</small>` will appear after the new book. And sending is false in books array we have seen before.
```TypeScript
const [books, setBooks] = useState<Book[]>([
{ text: "React", sending: false, key: 1 },
{ text: "React, TypeScript e Next.js", sending: false, key: 3 },
]);
```
We also add a form to add a new title to the book list.
```TypeScript
function Library(/** some params */) {
/** some contents */
return (
<>
{optimisticContent.map(
(message: { text: string; sending: boolean }, index: number) => (
<div key={index}>
{message.text}
{!!message.sending && <small> (Sending...)</small>}
</div>
)
)}
<form action={formAction}>
<input type="text" name="message" placeholder="Hello!" />
<button type="submit">Send</button>
</form>
</>
);
}
```
## Form action
Form will send data to `formAction()` function. Then the function add the content to the book list and send form to an external api. (use the imagination about the external api).
```TypeScript
async function formAction(formData: FormData) {
addContent(String(formData.get("message")));
await sendMessage(formData);
}
```
## useOptimistic
With this syntax we configure `optimisticContent` as optimistic content. For example, when addContent method is called, he receive new book marking the Book with sending=true.
```TypeScript
const [optimisticContent, addContent] = useOptimistic(
messages,
(state: Book[], newMessage: string) => [
...state,
{
text: newMessage,
sending: true,
},
]
);
```
## Complete code
```TypeScript
function Library({
books: messages,
createBook: sendMessage,
}: {
books: Book[];
createBook: (formData: FormData) => void;
}) {
async function formAction(formData: FormData) {
addContent(String(formData.get("message")));
await sendMessage(formData);
}
const [optimisticContent, addContent] = useOptimistic(
messages,
(state: Book[], newMessage: string) => [
...state,
{
text: newMessage,
sending: true,
},
]
);
return (
<>
{optimisticContent.map(
(message: { text: string; sending: boolean }, index: number) => (
<div key={index}>
{message.text}
{!!message.sending && <small> (Sending...)</small>}
</div>
)
)}
<form action={formAction}>
<input type="text" name="message" placeholder="Hello!" />
<button type="submit">Send</button>
</form>
</>
);
}
```
## Resume
When you use a form to send a new Book to the list of books, the `formAction` method add the item into the optimistic list. Then send data to an api, for example. After a while, the api return a value. And then the value is added to the real list of books.
| sensorario |
1,867,930 | Entendendo a Lei de Demeter em Design de Software | O Que é a Lei de Deméter? A Lei de Deméter, também conhecida como "Princípio do Mínimo Conhecimento",... | 0 | 2024-05-28T21:17:31 | https://dev.to/diegobrandao/entendendo-a-lei-de-demeter-em-design-de-software-3p5g | java, designpatterns, designsystem, oop | **O Que é a Lei de Deméter?**
A Lei de Deméter, também conhecida como "Princípio do Mínimo Conhecimento", é uma diretriz de design de software formulada para promover o encapsulamento e reduzir o acoplamento entre classes.
A pauta foi proposta por Ian Holland na Northeastern University no final de 1987, e pode ser sucintamente resumido nas seguintes formas:
- Cada unidade deve ter conhecimento limitado sobre outras unidades: apenas unidades próximas se relacionam.
- Cada unidade deve apenas conversar com seus amigos; Não fale com estranhos.
- Apenas fale com seus amigos imediatos.
**Em termos simples, ela recomenda que um objeto deve se comunicar apenas com seus amigos mais próximos e não se intrometer em detalhes internos de outros objetos.**
**Definição**
A definição formal da Lei de Deméter pode ser resumida da seguinte forma:
Um método M de uma classe C deve apenas chamar métodos que pertencem a:
1. C (a própria classe),
2. Objetos criados por M,
3. Objetos passados como parâmetros para M,
4. Objetos armazenados em variáveis de instância de C.
**Exemplo de Violação da Lei de Deméter**
Considere o seguinte exemplo em Java, onde a Lei de Deméter é violada:
**Problemas com Este Código**
No código acima, a classe ProcessadorDePagamentos conhece muitos detalhes internos de Pedido, Cliente e Endereco, o que viola a Lei de Deméter. Isso resulta em alto acoplamento e baixa coesão, dificultando a manutenção e a evolução do sistema.
**Exemplo de Conformidade com a Lei de Deméter**
Agora, vamos refatorar o código para conformidade com a Lei de Deméter:
**Melhorias com Este Código**
No código refatorado, a classe ProcessadorDePagamentos só conhece Pedido e não precisa saber sobre a estrutura interna de Cliente ou Endereco. **Isso reduz o acoplamento e melhora a coesão.**
**Vantagens**
- Redução de Acoplamento: Minimiza a dependência entre classes, tornando o código mais modular e fácil de modificar.
- Maior Encapsulamento: Promove o encapsulamento, ocultando os detalhes internos das classes.
- Facilidade de Manutenção: Com menos dependências, as mudanças em uma classe têm menor probabilidade de impactar outras partes do sistema.
- Teste e Debugging Simplificados: Classes menos acopladas são mais fáceis de isolar e testar.
**Desvantagens**
- Aumento do Número de Métodos: Pode levar a um aumento no número de métodos pass-through, que simplesmente delegam chamadas a outros métodos.
- Complexidade Percebida: Em alguns casos, pode ser mais difícil entender o fluxo de chamadas, especialmente para novos desenvolvedores que ainda não estão familiarizados com a base de código.
**Aplicação Prática da Lei de Deméter**
Para aplicar a Lei de Deméter de maneira eficaz, siga estas práticas:
- Utilize Métodos de Acesso Adequados: Em vez de expor estruturas internas, forneça métodos que retornem as informações necessárias.
- Delegue Responsabilidades: Cada classe deve ser responsável por suas próprias operações e não delegar trabalho a objetos internos de outras classes.
- Revise Regularmente o Código: Realize revisões de código focadas na conformidade com a Lei de Deméter para garantir que novas violações não sejam introduzidas.
**Conclusão**
A Lei de Deméter promove um design de software _mais limpo e sustentável ao reduzir o acoplamento entre classes e aumentar o encapsulamento_. Aplicar este princípio pode parecer trabalhoso no início, mas os benefícios a longo prazo em termos de manutenibilidade e clareza do código são inegáveis.
| diegobrandao |
1,866,936 | Securing My First Internship with Open Source | Hey👋, I am Archit Sharma, a student and SDE based in India. In this blog, I aim to share my... | 0 | 2024-05-28T21:17:09 | https://dev.to/iarchitsharma/securing-my-first-internship-with-open-source-15bn | webdev, beginners, programming, opensource | Hey👋, I am [Archit Sharma](https://iarchitsharma.github.io/), a student and SDE based in India. In this blog, I aim to share my experience and journey of obtaining my first internship through open source contributions.
## How did it all begin?
It all started back in 2023 when I was confused about what I was doing. I was learning different tech stacks but wasn't applying them anywhere. One night, I was looking through the LFX mentorship page and found a project called Meshery, which is under Layer5. Even though I didn't have all the required tech stacks, I still applied.
A few days later, I received a DM from the founder of Layer5, asking me to participate in the community and projects. He also gave me a brief introduction to the community and its projects.
And that is how I kickstarted my journey in open source.
## Joining the Community
I joined the Layer5 Slack and introduced myself in the `#newcomers` channel, where I received advice to join the website meeting held every Monday. Taking that advice, I attended the website meeting. At first, I was a bit shy, but then I introduced myself during the meeting. Additionally, I received my very first issue to work on during the same meeting. It was a simple task—just adding an image to a React component.
From that day onward, I never looked back and continued making contributions to the project. After six months of contributing, I was offered a six-month internship with Layer5.
## Advice for New Open Source Contributors
1. Consistency is key, be consistent in solving the project's problems
2. Ask your questions, but don't overly rely on or disturb the maintainers, as they might end up solving the issue themselves.
3. Things may seem overwhelming at first, but with patience, everything will eventually start to make sense.
## Conclusion
Besides all of this, **Layer5** is an awesome organization for networking and learning new things. In my opinion, it’s the most beginner-friendly organization, and I advise all open source beginners to give it a try.
> You can't connect the dots looking forward; you can only connect them looking backwards. So you have to trust that the dots will somehow connect in your future. You have to trust in something - your gut, destiny, life, karma, whatever. This approach has never let me down, and it has made all the difference in my life. - **Steve Jobs**
| iarchitsharma |
1,868,141 | From Slow Code to Lightning Fast: Mastering the Trampolining Technique | Introduction Is your JavaScript code running slower than you’d like? Ever heard of the... | 0 | 2024-05-28T21:15:04 | https://dev.to/silverindigo/from-slow-code-to-lightning-fast-mastering-the-trampolining-technique-3cem | trampoliningtechnique, javascriptoptimization, recursivefunctionoptimization, tailcalloptimization | ## Introduction
Is your JavaScript code running slower than you’d like? Ever heard of the trampolining technique? It's a powerful method that can turbocharge your code, making it run faster and more efficiently. In this guide, we'll explain what trampolining is, how it works, and how you can implement it to optimize your JavaScript functions.
## Understanding Trampolining
**What is Trampolining?**
Trampolining is a technique used in software engineering to optimize recursive functions. It helps to avoid stack overflow errors by converting recursive calls into a loop, effectively managing the function calls without piling them up on the call stack.
**Why Use Trampolining?**
Using trampolining has several benefits:
- **Improved Performance:** It makes your code run faster by converting recursive calls into iterations.
- **Preventing Stack Overflow:** By avoiding deep recursion, it prevents stack overflow errors, especially in functions that call themselves repeatedly.
## How Trampolining Works
**Basic Principle**
Trampolining works by converting recursive calls into iterations. Instead of a function calling itself directly, it returns another function to be executed. This process continues until a final value is produced.
**Example Code**
Before Trampolining:
```javascript
function factorial(n) {
if (n === 0) {
return 1;
} else {
return n * factorial(n - 1);
}
}
```
**After Trampolining:**
```javascript
function trampoline(fn) {
return function(...args) {
let result = fn(...args);
while (typeof result === 'function') {
result = result();
}
return result;
};
}
function factorial(n, acc = 1) {
if (n === 0) {
return acc;
} else {
return () => factorial(n - 1, n * acc);
}
}
const trampolinedFactorial = trampoline(factorial);
console.log(trampolinedFactorial(5)); // Output: 120
```
**Technical Explanation**
Trampolining leverages continuations and tail-call optimization. Continuations allow the function to pause and resume, while tail-call optimization ensures that the function doesn’t add new frames to the call stack.
## Technical Explanation
Trampolining leverages continuations and tail-call optimization. Continuations allow the function to pause and resume, while tail-call optimization ensures that the function doesn’t add new frames to the call stack.
**Preparing Your Functions**
Not all functions need trampolining. Identify functions that involve deep recursion or are likely to cause stack overflow.
**Refactoring for Trampolining**
1. **Identify the Recursive Function:** Find the function that repeatedly calls itself.
2. **Modify the Function:** Change it to return another function instead of making a direct recursive call.
3. **Wrap with a Trampoline:** Use a trampoline function to execute the modified function iteratively.
**Common Pitfalls and How to Avoid Them**
Common pitfalls include infinite loops and performance overhead. Ensure your base case is correct to avoid infinite loops, and test and optimize performance as needed.
## Advanced Trampolining Techniques
**Enhancing Performance Further**
Trampolining can be further enhanced with techniques like memoization and lazy evaluation.
**Real-World Applications**
Many large-scale JavaScript applications use trampolining to handle recursive tasks efficiently, such as parsing complex data structures and certain functional programming paradigms.
## Conclusion
Trampolining is a powerful technique to optimize recursive functions in JavaScript. It improves performance and prevents stack overflow errors, making your code more robust and efficient.
Need help optimizing your JavaScript code? Check out this [Fiverr gig](https://www.fiverr.com/s/rE7bg7N) for professional bug fixing and performance enhancements! Let’s make your code lightning fast and error-free!
By following this guide, you can master the trampolining technique and take your JavaScript skills to the next level. Happy coding! | silverindigo |
1,868,139 | PART 1: Deploy modern applications on a production grade, local K8s Cluster, layered with Istio Service Mesh and Observability. | This is a three part tutorial that showcases how to build modern applications from ground up, using Kubernetes, service mesh, Next.js and FasAPI for Hackathons, MVPs and POCs. | 0 | 2024-05-28T21:09:34 | https://dev.to/codewired/part-1-deploy-modern-applications-on-a-production-grade-local-kubernetes-cluster-with-istio-service-mesh-and-observability-1ifp | ---
title: PART 1: Deploy modern applications on a production grade, local K8s Cluster, layered with Istio Service Mesh and Observability.
published: True
description: This is a three part tutorial that showcases how to build modern applications from ground up, using Kubernetes, service mesh, Next.js and FasAPI for Hackathons, MVPs and POCs.
tags:
# cover_image: https://direct_url_to_image.jpg
# Use a ratio of 100:42 for best results.
# published_at: 2024-05-28 19:44 +0000
---
This first part of the three part series will guide you through, how to setup a Hackathon Starter ready, production grade, local development k8s cluster and a service mesh using Rancher's k3s light weight clusters and Istio service mesh. We will then deploy a sample application, add observability and ramp up traffic to see the service mesh in action. The next two parts of this series which will be released next month, will focus on full stack application development with Next.js and FastAPI, effectively showing intermediate and advanced developers how to scaffold production grade dashboard applications and powerful, scalable Fast REST APIs for all purposes, and finally deploying them to the infrastructure that we will setup in this part.
INSTALL DOCKER AND k3d ON LINUX (Debian) & MAC
Install Docker Engine and k3d on MAC
1. `brew update`
2. `brew install --cask docker` (Recommended if you don't have docker desktop installed)
3. `brew install k3d` (Install k3d tool)
On Linux, you will need to uninstall older versions of docker engine on your Linux box if you installed an earlier version. There are two ways to do it.
The first option is to: Uninstall Docker Engine, CLI, containerd, and compose packages
`sudo apt-get purge docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin docker-ce-rootless-extras`
And delete all images, containers and volumes run:
1. `sudo rm -rf /var/lib/docker`
2. `sudo rm -rf /var/lib/containerd`
The second option is to run the command below to install all conflicting packages
`for pkg in docker.io docker-doc docker-compose docker-compose-v2 podman-docker containerd runc; do sudo apt-get remove $pkg; done`
Install latest docker engine using the apt repository
Add Docker's official GPG key:
1. `sudo apt-get update`
2. `sudo apt-get install ca-certificates curl`
3. `sudo install -m 0755 -d /etc/apt/keyrings`
4. `sudo curl -fsSL https://download.docker.com/linux/ubuntu/gpg -o /etc/apt/keyrings/docker.asc`
5. `sudo chmod a+r /etc/apt/keyrings/docker.asc`
Add the repository to Apt sources:
1. `echo "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.asc] https://download.docker.com/linux/ubuntu $(. /etc/os-release && echo "$VERSION_CODENAME") stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null`
2. `sudo apt-get update`
If you use an Ubuntu derivative distro, such as Linux Mint, you may need to use UBUNTU_CODENAME instead of VERSION_CODENAME.
To install the latest version run:
`sudo apt-get install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin`
To install a specific version based on your Linux distro version, do this:
List the available versions:
`apt-cache madison docker-ce | awk '{ print $3 }'`
Select and install the desired version
1. `VERSION_STRING=5:26.1.0-1~ubuntu.24.04~noble`
2. `sudo apt-get install docker-ce=$VERSION_STRING docker-ce-cli=$VERSION_STRING containerd.io docker-buildx-plugin docker-compose-plugin`
Create a docker group and add the current user
1. `sudo groupadd -f docker`
2. `sudo usermod -aG docker $USER`
Verify that the Docker Engine installation is successful by running the hello-world image.
`sudo docker run hello-world`
Install K3d, a light weight wrapper to run Rancher's K3s light weight clusters.
Latest Release `curl -s https://raw.githubusercontent.com/k3d-io/k3d/main/install.sh | bash`
Specific Release `curl -s https://raw.githubusercontent.com/k3d-io/k3d/main/install.sh | TAG=v5.0.0 bash`
Show docker version
`docker version`
Show k3d version
`k3d version`
INSTALL ISTIO (As of the time of writing this doc, the latest was 1.22.0 and it works with Kubernetes 1.30.1)
Install from Istio Download site
1. `curl -L https://istio.io/downloadIstio | sh -` (Install the Latest Release Version)
2. `curl -L https://istio.io/downloadIstio | ISTIO_VERSION=1.22.0 TARGET_ARCH=x86_64 sh -` (Install a specific version OR override processor architecture)
Install from Github Repo
1. `ISTIO_VERSION=1.22.0`
2. `ISTIO_URL=https://github.com/istio/istio/releases/download/$ISTIO_VERSION/istio-$ISTIO_VERSION-linux-amd64.tar.gz` (For Linux processor ARCH, change as needed)
3. `curl -L $ISTIO_URL | tar xz`
Move to the Istio folder and set your PATH env variables for Istio bin directory so you can run istioctl from anywhere
1. `cd istio-1.22.0`
2. `export PATH=$PWD/bin:$PATH` (You should add this line to your shell config file, .zshrc or .bashrc. Replace the $PWD value with the actual value in your shell config)
Show Istio CTL version
`istioctl version`
Inspect profiles:
1. `istioctl profile list` (Will list available profiles)
2. `istioctl profile dump default` (Will dump the default profile config)
Install Istio with the demo profile
`istioctl install --set profile=demo -y`
Deploy Multi-Node K3s Kubernetes Cluster (v1.30.1) with a local registry, disabling treafik for istio instead (3 nodes, including control plane)
The incantation below creates a 3 node Kubernetes cluster (1 control plane and 2 workers) and uses a load balancer port to expose the internal application via the nginx load balancer, also setting up an internal repository for pushing local images
`k3d cluster create svc-mesh-poc --agents 2 --port 7443:443@loadbalancer --port 3070:80@loadbalancer --api-port 6443 --registry-create svc-mesh-registry --image rancher/k3s:v1.30.1-k3s1 --k3s-arg '--disable=traefik@server:*'`
Probe local k3s docker images and the newly installed cluster
1. `docker ps --format 'table {{.ID}}\t{{.Image}}\t{{.Names}}\t{{.Ports}}'`
2. `kubectl get nodes`
3. `kubectl get ns`
4. `kubectl get pods -A`
5. `kubectl get services -A`
Create a Namespace for Demo Application that will be deployed so we can see Istio in action
`kubectl create namespace istio-demo-app`
To enable the automatic injection of Envoy sidecar proxies on the demo app namespace, run the following: (Otherwise you will need to do this manually when you deploy your applications)
`kubectl label namespace istio-demo-app istio-injection=enabled`
Deploy Istio's demo application using images from the manifests in the Istio installation samples folder which points to their public registries (Please examine the manifest before applying and make sure you are in the istio version folder)
1. `cd istio-1.22.0`
2. `kubectl -n istio-demo-app apply -f samples/bookinfo/platform/kube/bookinfo.yaml`
When installation is complete verify pods and services:
1. `kubectl -n istio-demo-app get services`
2. `kubectl -n istio-demo-app get pods`
Open Outside Traffic to pods so we can browse it locally and on the internal network via the browser:
`kubectl -n istio-demo-app apply -f samples/bookinfo/networking/bookinfo-gateway.yaml`
Analyze Namespace for Errors
`istioctl -n istio-demo-app analyze`
Open in browser
`http://localhost:3070/productpage`
Install Metrics and Tracing Utilities
1. `kubectl apply -f samples/addons`
2. `kubectl rollout status deployment/kiali -n istio-system`
If there are errors trying to install the addons, try running the command again. There may be some timing issues which will be resolved when the command is run again.
Access the Kiali dashboard
`istioctl dashboard kiali`
Ramp up hits on the demo application to see Istio MESH in action on Kiali. Run the command
`for i in $(seq 1 100);
do curl -so /dev/null http://localhost:3070/productpage;
done`
You many need to clean up all installation in the cluster at some point:
1. `kubectl delete -f samples/addons`
2. `kubectl -n istio-demo-app delete -f samples/bookinfo/networking/bookinfo-gateway.yaml`
3. `kubectl -n istio-demo-app delete -f samples/bookinfo/platform/kube/bookinfo.yaml`
4. `istioctl x uninstall --purge`
5. `kubectl delete namespace istio-system`
6. `kubectl delete namespace istio-demo-app`
7. `kubectl label namespace istio-demo-app istio-injection-`
You my need to delete the k3d/k3s cluster:
`k3d cluster delete svc-mesh-poc`
Yo may want to have more Graphical User Interface to see your cluster in full swing.To do that, deploy Kubernete Dashboard by running the following commands:
Add kubernetes-dashboard repository
`helm repo add kubernetes-dashboard https://kubernetes.github.io/dashboard/`
Deploy a Helm Release named "kubernetes-dashboard" using the kubernetes-dashboard chart
`helm upgrade --install kubernetes-dashboard kubernetes-dashboard/kubernetes-dashboard --create-namespace --namespace kubernetes-dashboard`
Verify that Dashboard is deployed and running.
`kubectl get pod -n kubernetes-dashboard`
Create a ServiceAccount and ClusterRoleBinding to provide admin access to the newly created cluster.
1. `kubectl create serviceaccount -n kubernetes-dashboard admin-user`
2. `kubectl create clusterrolebinding -n kubernetes-dashboard admin-user --clusterrole cluster-admin --serviceaccount=kubernetes-dashboard:admin-user`
To log in to your Dashboard, you need a Bearer Token. Use the following command to store the token in a variable.
`token=$(kubectl -n kubernetes-dashboard create token admin-user)`
Display the token using the echo command and copy it to use for logging into your Dashboard.
`echo $token`
You can access your Dashboard using the kubectl command-line tool and port forwarding by running the following commands and pasting the Bearer token on the text box:
`kubectl -n kubernetes-dashboard port-forward svc/kubernetes-dashboard-kong-proxy 8443:443`
Browse to https://localhost:8443
Clean Up Admin Service Account and Cluster Role Binding for Kubernetes Dashboard user.
1. `kubectl -n kubernetes-dashboard delete serviceaccount admin-user`
2. `kubectl -n kubernetes-dashboard delete clusterrolebinding admin-user`
Now that you have A lightweight multi-node cluster running locally with Istio configured, you can now try out all of these Istio features:
1. Request Routing
2. Fault Injection
3. Traffic Shifting
4. Querying metrics
5. Visualizing metrics
6. Accessing external services
7. Visualizing your mesh.
Stay tuned for more! | codewired | |
1,868,137 | Deploy static websites and web apps anywhere in minutes with TurboCloud | Big cloud providers want you to think that the cloud is super complicated so they can sell their... | 0 | 2024-05-28T21:05:41 | https://dev.to/pavel_localcloud/deploy-static-websites-and-web-apps-everywhere-in-minutes-with-turbocloud-32k3 | Big cloud providers want you to think that the cloud is super complicated so they can sell their services. But that's not true at all - the cloud is just remote machines connected together. We at LocalCloud want to simplify deployments and show that the cloud industry is overengineered nowadays.
That's why we developed what's probably the lightest and simplest way to deploy web projects anywhere - VPS, cloud server, dedicated server, or even on-premise. No configuration, no Git required, not even CLI setup - just go to the project's root folder and run one command. Meet TurboCloud - https://github.com/localcloud-dev/turbo-cloud
## Main Advantages
- Zero dependencies - your project will be available as long as your cloud provider is live
- Daemonless
- Unbelievably lightweight - one script, less than 10KB
- HTTPS for custom domains
- Works with WebSocket services (ws:// and wss://)
- TurboCloud itself uses very few resources
- Fully predictable cloud costs (with cloud providers from "Recommended Cloud Providers" below)
- Zero DevOps knowledge required
- Only one command to deploy from your local machine
- Works with virtually any cloud provider
- No Docker registry required
- Zero downtime deployments
# A few examples how it works
## How to Deploy Static Websites
- Order a VPS, cloud server, or dedicated server with a public IP address, fresh Ubuntu 22.04, and SSH access from any cloud provider (see Recommended Cloud Providers section below).
- Add an A record with the IP address of your new server to your custom domain (DNS A record: your_domain.com or subdomain.your_domain.com -> IP address of the server created in step 1)
- In the root folder of your static website project, run the following command (replace ip_address_of_server, expose_port_from_dockerfile, and your_domain_without_http_https with the real values):
```
curl https://raw.githubusercontent.com/localcloud-dev/turbo-cloud/main/turbocloud | sh -s -- -i ip_address_of_server -d your_domain_without_http_https -t static -p expose_port_from_dockerfile
```
- Open the URL you set with the -d flag in step 3 in your browser
## How to Deploy projects with Dockerfile
- Order a VPS, cloud server, or dedicated server with a public IP address, fresh Ubuntu 22.04, and SSH access from any cloud provider (see Recommended Cloud Providers section below).
- Add an A record with the IP address of your new server to your custom domain (DNS A record: your_domain.com or subdomain.your_domain.com -> IP address of the server created in step 1)
- In the root folder of your project with Dockerfile (Dockerfile should be in the project's root folder), run the following command (replace ip_address_of_server and your_domain_without_http_https with the real values):
```
curl https://raw.githubusercontent.com/localcloud-dev/turbo-cloud/main/turbocloud | sh -s -- -i ip_address_of_server -d your_domain_without_http_https -t dockerfile
```
- Open the URL you set with the -d flag in step 3 in your browser
**Full documentation can be found at https://github.com/localcloud-dev/turbo-cloud** | pavel_localcloud | |
1,868,138 | Örnek ile converter java | @NoArgsConstructor(access = AccessLevel.PRIVATE) public class CustomerConverter { public static... | 0 | 2024-05-28T21:04:09 | https://dev.to/mustafacam/ornek-ile-converter-java-4nao |
@NoArgsConstructor(access = AccessLevel.PRIVATE)
public class CustomerConverter {
public static Customer toCustomer(CustomerSaveRequest request) {
String hashedPassword = HashUtil.generate(request.getPassword());
Customer customer = new Customer(request.getName(), request.getSurname(), request.getEmail(), hashedPassword);
customer.setAccountType(AccountType.STANDARD);
customer.setIsActive(Boolean.TRUE);
return customer;
}
}
burda ne yapılmış ?
Bu kod parçasında, bir `CustomerConverter` adında bir sınıf oluşturulmuş ve bu sınıf içinde bir statik metot tanımlanmış. Bu metot, bir `CustomerSaveRequest` nesnesini alarak bir `Customer` nesnesine dönüştürmek için kullanılıyor. İşlemlerin ayrıntılarına bakalım:
### Anotasyon ve Sınıf Tanımı
```java
@NoArgsConstructor(access = AccessLevel.PRIVATE)
public class CustomerConverter {
```
- **@NoArgsConstructor(access = AccessLevel.PRIVATE)**: Bu anotasyon, Lombok kütüphanesi tarafından sağlanır ve sınıfın özel bir parametresiz (no-args) kurucu oluşturur. Böylece bu sınıftan nesne oluşturulması engellenir. Bu, tüm metotların statik olacağını ve bu sınıfın yalnızca bir yardımcı (utility) sınıf olarak kullanılacağını gösterir.
### Statik Metot
```java
public static Customer toCustomer(CustomerSaveRequest request) {
```
- **public static Customer toCustomer(CustomerSaveRequest request)**: Bu metot, `CustomerSaveRequest` nesnesini alarak bir `Customer` nesnesine dönüştürür. Metot statik olduğu için `CustomerConverter` sınıfının bir örneğini oluşturmadan doğrudan çağrılabilir.
### Parolanın Hashlenmesi
```java
String hashedPassword = HashUtil.generate(request.getPassword());
```
- **String hashedPassword = HashUtil.generate(request.getPassword())**: `request` nesnesinden alınan parola (`password`), `HashUtil` sınıfındaki `generate` metodu kullanılarak hashlenir. Bu, parolanın güvenli bir şekilde saklanmasını sağlar.
### Customer Nesnesinin Oluşturulması
```java
Customer customer = new Customer(request.getName(), request.getSurname(), request.getEmail(), hashedPassword);
```
- **Customer customer = new Customer(...)**: `CustomerSaveRequest` nesnesinden alınan isim (`name`), soyisim (`surname`), e-posta (`email`) ve hashlenmiş parola (`hashedPassword`) kullanılarak yeni bir `Customer` nesnesi oluşturulur.
### Ek Ayarların Yapılması
```java
customer.setAccountType(AccountType.STANDARD);
customer.setIsActive(Boolean.TRUE);
```
- **customer.setAccountType(AccountType.STANDARD)**: Müşterinin hesap türü `STANDARD` olarak ayarlanır.
- **customer.setIsActive(Boolean.TRUE)**: Müşteri aktif olarak işaretlenir.
### Sonuç
```java
return customer;
```
- **return customer**: Oluşturulan ve ayarları yapılan `Customer` nesnesi geri döndürülür.
### Özet
Bu kod parçası, bir `CustomerSaveRequest` nesnesinden bir `Customer` nesnesi oluşturan bir yardımcı sınıf (utility class) tanımlar. `CustomerConverter` sınıfı, özel bir kurucuya sahip olduğu için doğrudan örneklenemez. Statik `toCustomer` metodu, `CustomerSaveRequest`'ten gelen verileri kullanarak yeni bir `Customer` nesnesi oluşturur, parolayı hashler, hesap türünü ve aktif durumunu ayarlar ve son olarak bu nesneyi geri döndürür. | mustafacam | |
1,868,135 | Google's Updated Algorithm | I thought that this was an interesting topic to look into because of Google's status as a tech giant.... | 0 | 2024-05-28T20:50:15 | https://dev.to/christopherchhim/googles-updated-algorithm-13oe | algorithms, browser, ai | I thought that this was an interesting topic to look into because of Google's status as a tech giant. Google is widely known for its technological innovations and is the most frequently used browser so I wanted to look into the changes it was making. This also gives me an idea of Google's functionality and external factors affecting its engine.
Google is the leading company when it comes to web browsers so I wanted to blog about the incoming changes to its engine and the impacts they will bring. As of late, Google started implementing AI into its search engine to generate a response for users. While this may be beneficial to the users, this is a huge setback for businesses relying on Google's engine, effectively putting many people out of business. Thomas Germain's article _Google just updated its algorithm. The Internet will never be the same_ presents the pros and cons of Google's search engine. It also makes me understand how Google is being used from a corporation's point of view, providing me insight on how it is currently being used.
AI was Google's solution in weeding out insignificant search results by corporations. As it turns out, Google has received discordance on the web traffic received by users as they are being led to websites that provide little information as a way for corporations to gain revenue off of said traffic. This led to many users doubting the web browser's search engine optimization, resulting in Google's development of their personal AI.
While AI did help solve issues regarding web traffic, it also brought new issues to Google's search engine optimization. Consequently, various companies were receiving less traffic and losing revenue. I had never understood Google's reasons for developing AI up until I had read this blog and this development fascinates me. It helps me to understand AI's emerging impacts in the technology industry.
This post was heavily inspired from:
Germain, T. (2024, May 25) Google just updated its algorithm. The Internet will never be the same
Retrieved from: [https://www.bbc.com/future/article/20240524-how-googles-new-algorithm-will-shape-your-internet]
| christopherchhim |
1,868,133 | How to Build a Balance Sheet in an Angular Report Designer | Learn how to build a balance sheet in an Angular report designer. See more from ActiveReportsJS today. | 0 | 2024-05-28T20:48:04 | https://developer.mescius.com/blogs/how-to-build-a-balance-sheet-in-an-angular-report-designer | webdev, devops, javascript, tutorial | ---
canonical_url: https://developer.mescius.com/blogs/how-to-build-a-balance-sheet-in-an-angular-report-designer
description: Learn how to build a balance sheet in an Angular report designer. See more from ActiveReportsJS today.
---
**What You Will Need**
- ActiveReportsJS Report Designer
- NPM
- VisualStudio Code
- Angular
**Controls Referenced**
- [Angular Report Designer](https://developer.mescius.com/activereportsjs/docs/GettingStarted/QuickStart-ARJS-Designer-Component/QuickStart-Angular)
**Tutorial Concept**
Angular Balance Sheet - Using the ActiveReportsJS Angular report designer component, many different types of data can be visualized, including financial reports (such as balance sheets) in a web application.
---
Businesses utilize balance sheets, some quarterly, others annually, to provide a snapshot of their company’s financial position at that point in time. Presenting a summary of the company’s assets, liabilities, and equity, balance sheets are used to glean insights on the financial health and stability of the business and are used by creditors, investors, and stakeholders.
In the modern business landscape, it is important to be able to build and access reports, like a balance sheet, from anywhere, at any time, and ActiveReportsJS is there to help. With our Angular Report Designer and Viewer, we make it easy to build, modify, and view reports from any device at any time. In this article, we’ll show you how to design a balance sheet using our Angular Report Designer, which can then be viewed using our Angular Report Viewer.
In this article, we’ll be covering the following topics:
* [Adding the Angular Report Designer to an Application](#Designer)
* [Saving the Report Details](#Details)
* [Adding a Data Source and Data Set to the Report](#Source)
* [Designing the Balance Sheet and Binding Data to Controls](#Design)
If you’d like more information about Angular integration, you can check out our [documentation](https://developer.mescius.com/activereportsjs/docs/DeveloperGuide/ActiveReportsJSDesignerComponent/Integration/Angular-Component "https://developer.mescius.com/activereportsjs/docs/DeveloperGuide/ActiveReportsJSDesignerComponent/Integration/Angular-Component").
## <a id="Designer"></a>Adding the Angular Report Designer to an Application
The first thing that we’ll need to do is add the ActiveReportsJS Angular packages to our application. Inside the folder of the application, run the following command:
```
npm i @grapecity/activereports-angular
```
After a moment of installation, you’ll have access to the ActiveReportsJS Angular library in your application. Next, we’ll need to ensure that the proper modules are loaded into the application and that we reference all of the required files.
Inside the **app.module.ts** file, import the following module:
```
import { ActiveReportsModule } from '@grapecity/activereports-angular';
```
This will ensure we can access the Angular Report Designer in our markup. Also, do not forget to add it to your imports list:
```
imports: [
BrowserModule,
ActiveReportsModule
]
```
Now, we can reference the Report Designer in our application; however, before implementing the designer, we’ll need to include the required CSS files.
For ActiveReportsJS, we need to import these files in the **styles.css** file of the application. The files must be loaded here, or the styles will not be applied to the control. Inside of this file, include the following imports:
```
@import "@grapecity/activereports/styles/ar-js-ui.css";
@import "@grapecity/activereports/styles/ar-js-designer.css";
```
Now that all required files have been imported, we can start working with the Report Designer in markup. To reference the Report Designer, include the following code in the **app.component.html** file:
```
<div id="designer-host">
<gc-activereports-designer></gc-activereports-designer>
</div>
```
That’s all there really is to include the Angular Report Designer in your application. Note that we’re also including a div wrapped around the designer. This is so that we can use it to control the size. By default, the designer will fill whatever element it’s placed in, so we do this to control the size.
Inside the **app.component.css** file, we set the size using the following code:
```
#designer-host {
width: 100%
height: 100%
}
```
Now, when we run the application, we should see the following:
With that complete, we can add functionality to save the report, which we’ll cover in the next section.
## <a id="Details"></a>Saving the Report Details
With the Report Designer added to our application, we’ll next need to add the ability for users to save their reports. Thankfully, the ActiveReportsJS Report Designer features several built-in events that allow us to do so: the **onSave** and **onSaveAs** events.
In the **app.component.html** file, modify the markup of the report designer to match the following:
```
<gc-activereports-designer [onSave]="onSaveReport" [onSaveAs]="onSaveAsReport"></gc-activereports-designer>
```
This will bind two methods, **onSave** and **onSaveAs**, to these two events. Now, inside the **app.component.ts** file, we’ll implement these methods so that they can be used when the events are fired:
```
counter = 0;
reportStorage = new Map();
onSaveReport = (info: any) => {
const reportId = info.id || `NewReport${++this.counter}`;
this.reportStorage.set(reportId, info.definition);
return Promise.resolve({displayName: reportId});
}
onSaveAsReport = (info: any) => {
const reportId = `NewReport${++this.counter}`;
this.reportStorage.set(reportId, info.definition);
return Promise.resolve({id: reportId, displayName: reportId});
}
```
Here, we first create a **Map()** that can be used to store the key-value pairs used by the report. Then, passing the information of the report as an argument, we map the data from the report to the map, and we return a promise with the report information included.
Note that this is using the in-memory reports storage. When implementing this live, you’ll most likely want to pass the report definition, which is a JSON object, to your backend to be stored.
## <a id="Source"></a>Adding a Data Source and Data Set to the Report
With the designer implemented and save functionality included, it’s time to get to work building out the balance sheet. However, before we start including controls in the report, we will need to get some data to display in the controls.
To bind data to a report, we will first need to add a **Data Source**. The data source is where we’ll be retrieving the data from.
To add a data source, open up the **Data Panel** and click the **Add** button in the data source panel:
This will bring up the data source wizard:
ActiveReportsJS supports two different ways of data binding (remote and embedded data binding), as well as two different data types (JSON and CSV data types). For the purposes of this demonstration, we'll use embedded JSON data as our data source.
Now, we have a source from which we can pull the data. However, we need to create a data set that can be used to hold that data, allowing us to reference it in the report. With the source added, we’ll need to click on the **Add** button next to our data source to bring up the data set creation wizard:
This is where we can set up the actual data that we’re pulling into the report. Note that if you’re using remote data, there will be some additional options for parameters, and so on, that you can pass to your backend. Since we’re embedding our data, we have fewer options here.
To properly load the data in, we’ll need to set the **JSON Path** field. This acts like a filter of sorts, allowing you to control which data is retrieved when building the data set. For our scenario, we want all of the data available, so we use the string **$.***, which signifies to the Report Designer that we want to pull in all of the available data.
Before we save the data source, we need to make sure that we can validate the data. This just checks that the data set can actually pull data from the source when building the report. If everything is as expected, you should see the **Database Fields** array populated with values:
With that complete, we have data that we can connect to controls. In the next section, we’ll build out the balance sheet and add data to the various components used.
## <a id="Design"></a>Designing the Balance Sheet and Binding Data to Controls
With our data set up, we can now build out the balance sheet in the report designer. The first thing we’re going to do is set up a page header to identify what the report is. At the top of the designer, click on the **Section** tab and select **Add Header.** This will add a header section to the top of this report.
Next, we’re going to drag a **TextBox** and an **Image** control into the page header. For the TextBox, we will set the text as **Balance Sheet,** and we will embed an image into the report, which we’ll use within the Image control.
To embed an image, select the Image control, and then under the **Action** section of the Properties Panel, open the **Image** dropdown, select the **Embedded** option, and click the **Load** button to bring up the file explorer and select the image that you want to upload.
After adding these controls (with a little bit of styling), the page header should look something like this:
Now, we will add some controls to display the company’s total assets and total liabilities. Drag and drop a table control from the control toolbox onto the report. Next, we will delete the header and footer rows. This is done by right-clicking on a cell in the row that we want to remove, hovering over the **Row**option, and then selecting **Delete Row**. We’re also going to delete a column, so follow the same steps above, except select **Column** and **Delete Column**.
Then, copy and paste this table so that we have two. For the cells in the first table, we’re going to set their values as **Total Assets** and **{TotalAssets}**, and **Total Liabilities** and **{TotalLiabilities}**.
Finally, select the second cell in each table, navigate to the **Format** property in the Properties Panel, and set it equal to **Currency**; this will ensure that our monetary values display in a currency format.
After some additional styling, our report now appears as shown below:
With that complete, it’s time to start adding additional tables to show all of the various assets and liabilities of the company. For this, we’re going to have six tables covering the following areas:
* Current Assets
* Current Liabilities
* Fixed Assets
* Long-Term Liabilities
* Other Assets
* Shareholders Equity
To make this easier, we will create a table template, which we can then duplicate to fill out with the rest of our data.
Drag and drop another table control onto the report, this time keeping the header and footer rows but removing one of the columns so that we only have two.
Then, we’re going to select both cells in the header row and merge them using the context menu. Finally, we’ll also add some styling so that the header and footer rows stand out. We’re going to set the background of the header row to grey, and then we'll also set the text color of the footer row to grey. Finally, in the second column, we will again set the format to 'Currency.'
When complete, the table should look something like this:
Now, we’re going to duplicate this table for each table of data that we will implement. In the case of this balance sheet, we will have six tables: **Current Assets**, **Current Liabilities**, **Fixed Assets**, **Long-Term Liabilities**, **Other Assets**, and **Shareholders Equity**. See the tables below to view how each are set up:
With the tables set up, the report is complete! If you preview the report, it should look similar to this:
## Conclusion
With that, we’ve come to the end of the article. I hope that this has shown you how easy it is to use ActiveReportsJS to build out your company’s balance sheet. Now, your employees can access the sheet from anywhere using the ActiveReportsJS Angular Report Viewer. If you use a remote data source that receives updates, this report will display the most recent changes to the balance sheet.
Happy coding! | chelseadevereaux |
1,868,134 | Top Open Source Tools | A post by BEIDI DINA SAMUEL | 0 | 2024-05-28T20:41:48 | https://dev.to/samglish/top-open-source-tools-4841 | nmap, censys, shodan, metasploit |
 | samglish |
1,868,131 | LeetCode Meditations: Design Add and Search Words Data Structure | Let's start with the description for Design Add and Search Words Data Structure: Design a data... | 26,418 | 2024-05-28T20:35:36 | https://rivea0.github.io/blog/leetcode-meditations-design-add-and-search-words-data-structure | computerscience, algorithms, typescript, javascript | Let's start with the description for [Design Add and Search Words Data Structure](https://leetcode.com/problems/design-add-and-search-words-data-structure):
> Design a data structure that supports adding new words and finding if a string matches any previously added string.
>
> Implement the `WordDictionary` class:
> - `WordDictionary()` Initializes the object.
> - `void addWord(word)` Adds `word` to the data structure, it can be matched later.
> - `bool search(word)` Returns `true` if there is any string in the data structure that matches `word` or `false` otherwise. `word` may contain dots `'.'` where dots can be matched with any letter.
For example:
```ts
WordDictionary wordDictionary = new WordDictionary();
wordDictionary.addWord('bad');
wordDictionary.addWord('dad');
wordDictionary.addWord('mad');
wordDictionary.search('pad'); // return False
wordDictionary.search('bad'); // return True
wordDictionary.search('.ad'); // return True
wordDictionary.search('b..'); // return True
```
We also have some constraints:
- `1 <= word.length <= 25`
- `word` in `addWord` consists of lowercase English letters.
- `word` in `search` consists of `'.'` or lowercase English letters.
- There will be at most `2` dots in `word` for `search` queries.
- At most `10^4` calls will be made to `addWord` and `search`.
---
Since we're dealing with words, especially _storing_ and _searching_ a lot of words, [the trie data structure](https://rivea0.github.io/blog/leetcode-meditations-chapter-10-tries) can be efficient to use here.
Adding words is easy — in fact, we've seen how to insert a word into a trie in [the previous problem](https://rivea0.github.io/blog/leetcode-meditations-implement-trie-prefix-tree).
However, searching seems to be a bit more challenging since we have to do something similar to a [regex](https://en.wikipedia.org/wiki/Regular_expression) search, using the dot character as a wildcard.
Before that, let's take a deep breath, and start with creating a simple trie node.
---
A simple trie node might look like this:
```ts
class TrieNode {
public children: Map<string, TrieNode>;
public isEndOfWord: boolean;
constructor() {
this.children = new Map();
this.isEndOfWord = false;
}
}
```
Our `TrieNode` class has `children` that is a `Map` with `string`s as keys, and `TrieNode`s as values.
It also has an `isEndOfWord` flag to mark the node as the end character of a word.
The `WordDictionary` class is going to be a trie, so we can initialize our root node in the `constructor`:
```ts
class WordDictionary {
public root: TrieNode;
constructor() {
this.root = new TrieNode();
}
...
}
```
Adding a word is the exact same thing we did in `insert` function of [the previous problem](https://rivea0.github.io/blog/leetcode-meditations-implement-trie-prefix-tree).
We'll traverse each character, and one by one, add it to our trie. We'll create a `currentNode` that initially points to the root node, and update it as we go. At the end, we'll mark the last node as the end of the word:
```ts
addWord(word: string): void {
let currentNode = this.root;
for (const char of word) {
if (!currentNode.children.has(char)) {
currentNode.children.set(char, new TrieNode());
}
currentNode = currentNode.children.get(char) as TrieNode;
}
currentNode.isEndOfWord = true;
}
```
| Note |
| :-- |
| Similar to the previous problem, we're casting `currentNode.children.get(char)` as a `TrieNode`, because TypeScript thinks that it might be `undefined`. This is one of those times that we know more than the TS compiler, so we're using a [type assertion](https://www.typescriptlang.org/docs/handbook/2/everyday-types.html#type-assertions). <br> Alternatively, we could've also used a [non-null assertion operator](https://www.typescriptlang.org/docs/handbook/2/everyday-types.html#non-null-assertion-operator-postfix) that asserts values as non `null` or `undefined`, like this: <br> <br> `currentNode = currentNode.children.get(char)!;` |
Now, it gets a little confusing when we need to implement `search`. We need to be able to match any letter for a dot, and the idea here is about _recursively checking the nodes_.
For example, if we are to search for `a.c`, first we check if `a` exists, then go on to its children two levels below to see if `c` exists as the last character. If we don't reach our goal on our first try, we need to _backtrack_, and search through the other children of `a` again.
So, the idea is that if the current character of the `word` we're searching for is a dot (`.`), then, we'll go through the children of the current node, and _do the same thing for each child, continuing with each character in the `word`_.
Let's see another example.
If the word is `s.y`, we first check if `s` exists as a child node of the root, if so, we go on to check if it has any child node that has a child node of `y`, and it marks the end of the word. We could have `say` or `sky` or `spy`, etc., it doesn't matter. As soon as it matches our criteria, we can return `true` immediately.
Note that for each child, we're essentially doing the same thing, but with the next character in `word` — it's a recursive function. In fact, it's a [depth-first search](https://rivea0.github.io/blog/leetcode-meditations-chapter-7-trees#dfs).
We'll keep track of the current index of the character we're looking at in `word` as well as the current node.
If the character is a dot (`.`), we'll go on to check each child, incrementing the current character index. Otherwise, we'll do our usual search. If the character is not in the children of the current node, we can return `false` immediately. If we have that character, we'll recursively search again, incrementing the character index and updating the current node:
```ts
function dfs(currentCharIdx: number, currentNode: TrieNode) {
if (currentCharIdx === word.length) {
return currentNode.isEndOfWord;
}
const char = word[currentCharIdx];
if (char === '.') {
for (const child of currentNode.children.values()) {
if (dfs(currentCharIdx + 1, child)) {
return true;
}
}
return false;
} else {
if (!currentNode.children.has(char)) {
return false;
}
return dfs(currentCharIdx + 1, currentNode.children.get(char) as TrieNode);
}
}
```
And, inside `search`, we can simply return whatever this function returns, passing it the first index of `word` and our `root` as arguments:
```ts
return dfs(0, this.root);
```
Here is the final solution in TypeScript:
```ts
class TrieNode {
public children: Map<string, TrieNode>;
public isEndOfWord: boolean;
constructor() {
this.children = new Map();
this.isEndOfWord = false;
}
}
class WordDictionary {
public root: TrieNode;
constructor() {
this.root = new TrieNode();
}
addWord(word: string): void {
let currentNode = this.root;
for (const char of word) {
if (!currentNode.children.has(char)) {
currentNode.children.set(char, new TrieNode());
}
currentNode = currentNode.children.get(char) as TrieNode;
}
currentNode.isEndOfWord = true;
}
search(word: string): boolean {
function dfs(currentCharIdx: number, currentNode: TrieNode) {
if (currentCharIdx === word.length) {
return currentNode.isEndOfWord;
}
const char = word[currentCharIdx];
if (char === '.') {
for (const child of currentNode.children.values()) {
if (dfs(currentCharIdx + 1, child)) {
return true;
}
}
return false;
} else {
if (!currentNode.children.has(char)) {
return false;
}
return dfs(currentCharIdx + 1, currentNode.children.get(char) as TrieNode);
}
}
return dfs(0, this.root);
}
}
/**
* Your WordDictionary object will be instantiated and called as such:
* var obj = new WordDictionary()
* obj.addWord(word)
* var param_2 = obj.search(word)
*/
```
#### Time and space complexity
The time complexity of adding a word is {% katex inline %} O(n) {% endkatex %} where {% katex inline %} n {% endkatex %} is the length of the word — because we iterate through each character once, doing a constant operation each time. The space complexity is also {% katex inline %} O(n) {% endkatex %} as our need for additional space will grow as the length of the word we're adding grows.
The time complexity of searching is—I think—{% katex inline %} O(n * m) {% endkatex %} where {% katex inline %} n {% endkatex %} is the length of the word and {% katex inline %} m {% endkatex %} is the total number of nodes. In the worst case where all the characters are dots, we'll search the entire tree for the word. The space complexity will be {% katex inline %} O(h) {% endkatex %} where {% katex inline %} h {% endkatex %} is the height of the trie, because of the recursive call stack.
---
Next up, we'll look at the last problem in this chapter, [Word Search II](https://leetcode.com/problems/word-search-ii). Until then, happy coding.
| rivea0 |
1,868,130 | The Best Way To Integrate APIs In React JS | Hii Developers. How do you integrate the APIs in React JS? Is there any best way to integrate the... | 0 | 2024-05-28T20:32:02 | https://dev.to/sajithpj/integrate-apis-using-a-common-function-in-react-js-the-best-way-to-integrate-apis-in-react-js-53he | javascript, learning, beginners, tutorial |
**Hii Developers**.
How do you integrate the **APIs** in **React JS**? Is there any best way to integrate the APIs, which will reduce the line of code, and provide an easy method to handle errors?
Let me share an improved way to integrate the APIs in React JS.
**Let's Explore🙌**
## **Before We Start**
Be ready with your React JS project with a form and install Yup to validate the form. Confused??, No worries.
**Step 1: Installing React JS**
I am going with vite to install the React JS. Simply run the following command to install React JS.
```
npm create vite@latest my-react-app --template react
```
*replace the my-react-app with your project name.
change the directory to the project folder.
```
cd my-react-app
```
Install the required dependencies by running
```
npm install
```
**Step 2: Install Axios**
Install the Axios by running
```
npm i axios
```
**Step 3: Install react-toastify**
We are going to use react-toastify to handle the errors from backend.
```
npm i react-toastify
```
You can ignore this step if you have your own way to display the error.
That's all about installations. Let's create a form.
**Step 4: Setup a form with validation**
I am creating the form inside `App.jsx`. You follow your folder structure.
```jsx
import { useState } from "react";
import { removeError, validate } from "./utils/validation";
import { object, string } from "yup";
import { httpRequest } from "../../../config";
const App = () => {
const [employeeDetails, setEmployeeDetails] = useState({
name: "",
email: "",
phoneNumber: "",
password: "",
});
const handleChange = (event) => {
setEmployeeDetails({
...employeeDetails,
[event.target.name]: event. target.value,
});
removeError(event.target.name)
};
// A yup validation schema to validate the form.
const validationSchema = object().shape({
name: string().required("Please enter you name"),
email: string()
.required("Email is required")
.email("Please enter a valid email address"),
phoneNumber: string()
.matches(/^[0-9]{10}$/, "Phone number must be exactly 10 digits")
.required("Phone number is required"),
password: string()
.required("Password is required")
.min(8, "Password must be at least 8 characters long")
.matches(/[a-z]/, "Password must contain at least one lowercase letter")
.matches(/[A-Z]/, "Password must contain at least one uppercase letter")
.matches(/[0-9]/, "Password must contain at least one number"),
});
const handleSubmit = async (event) => {
event.preventDefault();
// validate is a function which will validate the value against the
// validationSchema and generates the error in UI
const { errors, isValid } = await validate({
validationSchema,
value: employeeDetails,
});
if (!isValid) return;
// apiCall()
};
return (
<div className="flex items-center justify-center min-h-screen bg-gray-100">
<div className="w-full max-w-md p-8 space-y-6 bg-white rounded shadow-lg">
<h2 className="text-2xl font-bold text-center">Add Employee</h2>
<form onSubmit={handleSubmit} className="space-y-4">
<div data-input-parent="true">
<label className="block text-sm font-medium">Name</label>
<input
type="text"
name="name"
id="name"
value={employeeDetails.name}
onChange={handleChange}
className="w-full px-3 py-2 border rounded-lg focus:outline-none focus:ring focus:border-blue-300"
data-input="true"
/>
</div>
<div data-input-parent="true">
<label className="block text-sm font-medium">Email</label>
<input
type="email"
name="email"
id="email"
value={employeeDetails.email}
onChange={handleChange}
className="w-full px-3 py-2 border rounded-lg focus:outline-none focus:ring focus:border-blue-300"
data-input="true"
/>
</div>
<div data-input-parent="true">
<label className="block text-sm font-medium">Phone Number</label>
<input
type="text"
name="phoneNumber"
id="phoneNumber"
value={employeeDetails.phoneNumber}
onChange={handleChange}
data-input="true"
className="w-full px-3 py-2 border rounded-lg focus:outline-none focus:ring focus:border-blue-300"
/>
</div>
<div data-input-parent="true">
<label className="block text-sm font-medium">Password</label>
<input
type="password"
name="password"
id="password"
value={employeeDetails.password}
onChange={handleChange}
data-input="true"
className="w-full px-3 py-2 border rounded-lg focus:outline-none focus:ring focus:border-blue-300"
/>
</div>
<button
type="submit"
className="w-full px-4 py-2 text-white bg-blue-500 rounded-lg hover:bg-blue-700 focus:outline-none focus:ring focus:ring-blue-300"
>
Submit
</button>
</form>
</div>
</div>
);
};
export default App;
```
**Cool**😎, Now we have the form ready with us 🥳.
> **_IF YOU ARE USING THE ABOVE FORM AND ITS VALIDATION. PLEASE READ ABOUT THE [VALIDATE](https://dev.to/sajithpj/validation-with-yup-did-you-know-this-method--5h8) METHOD USED TO VALIDATE THE FORM_**.
## **All Set!! Let's Start**
First, you need to create the reusable function to make API calls, for that, you need to set up the Axios.
- Create a folder called `config` inside `src`.
- Create a file called `index.js` inside the folder called `config`.
- Create a file called `axios.js` inside the folder called `config`.
So, the project's folder structure will be like this.
```
my-react-app/
├── src/
│ ├── config/
│ │ ├── axios.js
│ │ └── index.js
│ ├── App.jsx
│ ├── main.jsx
│ ├── assets/
│ ├── components/
│ ├── pages/
│ ├── styles/
├── public/
├── index.html
├── package.json
├── vite.config.js
```
In `axios.js`, we will create axios instance and a interceptors to request and response.
```javascript
import axios from "axios";
const axiosInstance = axios.create();
// Request Interceptor
axiosInstance.interceptors.request.use((config) => {
// setting the base URL from env, example: https://api.example.com/api
config.baseURL = import.meta.env.VITE_API_BASE_URL;
// config.headers = Object.assign(
// {
// Authorization: `Bearer ${localStorage.getItem("token")}`,
// },
// config.headers
// );
return config;
});
//Example of Response Interceptor
axiosInstance.interceptors.response.use(
(response) => {
return response;
},
(err) => {
return Promise.reject(err);
}
);
export default axiosInstance;
```
Here, We created a axios instance and stored in axiosInstance.
**Request Interceptor:** The request interceptor modifies the request configuration before the request is sent.
**Base URL:** config.baseURL is set from an environment variable (VITE_API_BASE_URL). This sets the base URL for all requests made with this Axios instance.
**Authorization Header (Commented):** There is a commented-out section that would add an Authorization header with a token from local storage. Uncommenting this code would attach the header to every request made by this Axios instance.
**Response Interceptor:** The response interceptor allows you to handle responses and errors globally.
- Success Handler: The first function passed to
axiosInstance.interceptors.response.use is the success handler. It
receives the response object and returns it directly, meaning
successful responses are passed through without modification.
- **Error Handler:** The second function is the error handler. It
receives the error object and returns a rejected Promise. This
allows you to handle errors in a centralized place. You can add
custom error handling logic here if needed.
Finally, we are exporting axiosInstance from this file.
Inside `src/config/index.js` we will add functions to make the API call and handle the response.
```javascript
const getMessages = (status, message) => {
if (message !== undefined && message !== "") {
return message;
}
return "Something Went Wrong";
};
const handleResponse = (error) => {
// set the message according to your API response.
let message =
error.response?.data.message !== undefined
? error.response.data.message
: "";
let successStatusCode = [200];
let errorStatusCode = [400, 500, 404, 403];
let status = error.response?.status;
if (errorStatusCode.includes(status)) {
toast(getMessages(status, message), {
type: "error",
position: "top-right",
autoClose: 2000,
hideProgressBar: false,
closeOnClick: true,
pauseOnHover: true,
draggable: true,
progress: undefined,
theme: "light",
});
} else if (status === 401) {
window.location = "/signin";
}
};
export const httpRequest = ({
api,
method = "get",
data = {},
config = {},
catchError = true,
}) => {
const httpMethod = method.toLocaleLowerCase();
return new Promise((resolve, reject) => {
axiosInstance[httpMethod](api, data, config)
.then((response) => {
resolve(response);
})
.catch((error) => {
if (catchError) handleResponse(error);
else reject(error);
});
});
};
```
## **Explanation**
In the `config/index.js`, I created tree functions httpRequest, handleResponse, and getMessages.
**httpRequest:** This function makes an HTTP request using the Axios instance and handles the response and errors. This function will accept some parameters like,
- `api`: The API endpoint.
- `method`: The HTTP method (default is "get").
- `data`: The request payload (default is an empty object).
- `config`: Additional Axios configuration (default is an empty object).
- `catchError`: A boolean indicating whether to handle errors internally or reject the promise (default is true).
This function returns a new Promise. The function calls the appropriate Axios method (get, post, put, etc.) based on the lowercase HTTP method. If the request is successful, it resolves the promise with the response. If the request fails, it either handles the error using the `handleResponse` function or rejects the promise with the error, depending on the value of the `catchError` flag.
**handleResponse:**This function handles the API response errors. This function receives a parameter called `error`, its will be axios error object from catch.
- Retrieves the message from the error response if it exists.
- Defines successStatusCode and errorStatusCode arrays for reference.
- Checks the status code of the response:
- If the status code is in `errorStatusCode`, it displays a
toast notification with the error message.
- If the status code is 401, it redirects the user to the `/signin`
page.
**Good🙌**, You just created a function that can be used for any project to integrate API.
## **How To Use With Form**
So, the Form will look like this
```jsx
import { useState } from "react";
import { removeError, validate } from "./utils/validation";
import { object, string } from "yup";
import { httpRequest } from "./config";
const App = () => {
const [employeeDetails, setEmployeeDetails] = useState({
name: "",
email: "",
phoneNumber: "",
password: "",
});
const handleChange = (event) => {
setEmployeeDetails({
...employeeDetails,
[event.target.name]: event. target.value,
});
removeError(event.target.name)
};
// A yup validation schema to validate the form.
const validationSchema = object().shape({
name: string().required("Please enter you name"),
email: string()
.required("Email is required")
.email("Please enter a valid email address"),
phoneNumber: string()
.matches(/^[0-9]{10}$/, "Phone number must be exactly 10 digits")
.required("Phone number is required"),
password: string()
.required("Password is required")
.min(8, "Password must be at least 8 characters long")
.matches(/[a-z]/, "Password must contain at least one lowercase letter")
.matches(/[A-Z]/, "Password must contain at least one uppercase letter")
.matches(/[0-9]/, "Password must contain at least one number"),
});
const handleSubmit = async (event) => {
event.preventDefault();
// validate is a function which will validate the value against the
// validationSchema and generates the error in UI
const { errors, isValid } = await validate({
validationSchema,
value: employeeDetails,
});
if (!isValid) return;
httpRequest({
api: "/auth/signin",
method: "post",
data: employeeDetails,
}).then((response) => {
console.log("API, Success ");
});
// Dont need to add catch as we catch error in a common function.
};
return (
<div className="flex items-center justify-center min-h-screen bg-gray-100">
<div className="w-full max-w-md p-8 space-y-6 bg-white rounded shadow-lg">
<h2 className="text-2xl font-bold text-center">Add Employee</h2>
<form onSubmit={handleSubmit} className="space-y-4">
<div data-input-parent="true">
<label className="block text-sm font-medium">Name</label>
<input
type="text"
name="name"
id="name"
value={employeeDetails.name}
onChange={handleChange}
className="w-full px-3 py-2 border rounded-lg focus:outline-none focus:ring focus:border-blue-300"
data-input="true"
/>
</div>
<div data-input-parent="true">
<label className="block text-sm font-medium">Email</label>
<input
type="email"
name="email"
id="email"
value={employeeDetails.email}
onChange={handleChange}
className="w-full px-3 py-2 border rounded-lg focus:outline-none focus:ring focus:border-blue-300"
data-input="true"
/>
</div>
<div data-input-parent="true">
<label className="block text-sm font-medium">Phone Number</label>
<input
type="text"
name="phoneNumber"
id="phoneNumber"
value={employeeDetails.phoneNumber}
onChange={handleChange}
data-input="true"
className="w-full px-3 py-2 border rounded-lg focus:outline-none focus:ring focus:border-blue-300"
/>
</div>
<div data-input-parent="true">
<label className="block text-sm font-medium">Password</label>
<input
type="password"
name="password"
id="password"
value={employeeDetails.password}
onChange={handleChange}
data-input="true"
className="w-full px-3 py-2 border rounded-lg focus:outline-none focus:ring focus:border-blue-300"
/>
</div>
<button
type="submit"
className="w-full px-4 py-2 text-white bg-blue-500 rounded-lg hover:bg-blue-700 focus:outline-none focus:ring focus:ring-blue-300"
>
Submit
</button>
</form>
</div>
</div>
);
};
export default App;
```
**Wooohh😃**, You just learned the best method for API integration.
## **Conclusion**
In the traditional method, you need to duplicate API call like `axios.get()` or `axios.post()` a lot of times. if you are dealing with 100 APIs in a project, there will be a lot of duplicated code. By the above method, we can ignore duplication and it will help you to catch errors globally.
## **About Me**
I am Sajith P J, Senior React JS Developer, A JavaScript developer with the entrepreneurial mindset. I combine my experience with the super powers of JavaScript to satisfy your requirements.
## **_Reach Me Out _**
- [LinkedIn](https://www.linkedin.com/in/sajith-p-j/)
- [Instagram](https://www.instagram.com/dev_.sajith/)
- [Website](https://sajith.in/)
- [Email(sajithpjofficialme@gmail.com)](mailto:sajithpjofficialme@gmail.com)
| sajithpj |
1,868,129 | Understanding JavaScript Blocks and Scope | Blocked in JavaScript A block, or compound statement, in JavaScript is defined by the... | 27,544 | 2024-05-28T20:29:32 | https://bhaveshjadhav.hashnode.dev/understanding-javascript-blocks-and-scope | webdev, javascript, programming, beginners | ### Blocked in JavaScript
A block, or compound statement, in JavaScript is defined by the curly braces `{}`. It is used to group multiple statements together. For example:
```javascript
{
let a = 10;
console.log(a);
}
```
### Why Do We Need to Group Statements?
We group multiple statements together in a block so that we can use them where JavaScript expects a single statement. For example:
```javascript
if (true) console.log("Hello");
```
This is valid JavaScript syntax, as JavaScript expects a single statement after the `if` condition. But if we need to execute multiple statements when the `if` condition is true, we use a block:
```javascript
if (true) {
var a = 10;
console.log(a);
}
```
### Block Scope
Block scope refers to the variables and functions that we can access inside the block. For example:
```javascript
{
var a = 10;
let b = 20;
const c = 30;
}
console.log(a); // Accessible
console.log(b); // Not accessible
console.log(c); // Not accessible
```
Here, `var a` is accessible outside the block because `var` has a global or function scope. However, `let` and `const` are not accessible outside the block because they have block scope.
### What is Shadowing in JavaScript?
Shadowing occurs when a variable declared within a certain scope (e.g., inside a block) has the same name as a variable declared in an outer scope. The inner variable shadows the outer variable:
```javascript
var a = 100;
{
var a = 10; // This shadows the variable outside the block
let b = 20;
const c = 30;
console.log(a); // Prints 10
}
console.log(a); // Prints 10, the value is modified by the inner var
```
In the case of `let` and `const`, shadowing behaves differently because they have block scope:
```javascript
let b = 100;
{
var a = 10;
let b = 20; // This shadows the outer let variable
const c = 30;
console.log(b); // Prints 20
}
console.log(b); // Prints 100, because let has block scope
```
### Illegal Shadowing
Illegal shadowing occurs when a `let` variable is shadowed by a `var` variable inside the same block:
```javascript
let a = 20;
{
var a = 20; // Illegal shadowing, causes an error
}
```
However, the reverse is allowed:
```javascript
var a = 20;
{
let a = 30; // This is allowed
}
```
#### Reason for Reverse Allowance
The reason the reverse is allowed (`var` outside and `let` inside) is due to the scoping rules of JavaScript. `var` has function or global scope, meaning it can be accessed throughout the entire function or globally. `let` and `const`, however, have block scope, meaning they are only accessible within the block they are defined in. Therefore, defining a `let` or `const` inside a block does not interfere with the `var` outside the block, allowing the code to be valid.
### Shadowing in Function Scope
Shadowing also applies to function scopes. However, since `var` has function scope, it behaves differently:
```javascript
let a = 20;
function x() {
var a = 20; // This is allowed
}
```
In this case, the `var` declaration inside the function does not affect the `let` variable outside the function.
### Conclusion
Understanding blocks, block scope, and variable shadowing is crucial for writing efficient and bug-free JavaScript code. Properly managing scope and avoiding illegal shadowing can help prevent unexpected behaviors and maintain code clarity. | bhavesh_jadhav_dc5b8ed28b |
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Contact Us / 24 Hours Reply
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Email:dmhelpshop@gmail.com | tibetib790 |
1,868,128 | #1208. Get Equal Substrings Within Budget | https://leetcode.com/problems/get-equal-substrings-within-budget/description/?envType=daily-question&... | 0 | 2024-05-28T20:29:24 | https://dev.to/karleb/1208-get-equal-substrings-within-budget-3b40 | https://leetcode.com/problems/get-equal-substrings-within-budget/description/?envType=daily-question&envId=2024-05-28
```js
/**
* @param {string} s
* @param {string} t
* @param {number} maxCost
* @return {number}
*/
var equalSubstring = function(s, t, maxCost) {
let n = s.length, start = 0, currCost = 0, maxLen = 0
for (let end = 0; end < n; end++) {
currCost += Math.abs(s.charCodeAt(end) - t.charCodeAt(end))
while(currCost > maxCost) {
currCost -= Math.abs(s.charCodeAt(start) - t.charCodeAt(start))
start++
}
maxLen = Math.max(maxLen, end - start + 1)
}
return maxLen
};
``` | karleb | |
1,868,127 | Django: Admin | From: https://developer.mozilla.org/en-US/docs/Learn/Server-side/Django/Admin_site See my... | 0 | 2024-05-28T20:26:53 | https://dev.to/samuellubliner/django-admin-2f3i | webdev, python, django | From: https://developer.mozilla.org/en-US/docs/Learn/Server-side/Django/Admin_site
See my `locallibrary/catalog/admin.py`
https://github.com/Samuel-Lubliner/local-library-django-tutorial/blob/main/locallibrary/catalog/admin.py
# Django admin application
- Allows creating, viewing, updating, and deleting records using models.
- Simplifies testing models and data during development.
- Useful for managing data in production environments.
- Recommended only for internal data management.
- Dependencies needed: [Django Admin Documentation](https://docs.djangoproject.com/en/5.0/ref/contrib/admin/).
- Register models to add them to the admin interface.
- Configure the admin area for better display.
- Create a new "superuser."
## Registering models
Register models in `/django-locallibrary-tutorial/catalog/admin.py`. This is the simplest way of registering models with the site.
## Creating a superuser
A superuser account has full access to the site and all needed permissions using `manage.py`.
- Log into the admin site with a user account that has Staff status enabled.
- View and create records with permissions to manage all objects.
In the same directory as `manage.py` run:
`python3 manage.py createsuperuser`
Restart the development server to test the login:
`python3 manage.py runserver`
## Logging in and using the site
Open the /admin URL and enter the superuser credentials. The GUI allows you to view models and edit field values.
## Advanced configuration
List views and detail views provide greater customization
Find a reference of the admin site in the docs: https://docs.djangoproject.com/en/5.0/ref/contrib/admin/
## Register a ModelAdmin class
Comment out the original registrations. Then Define a `ModelAdmin` class and register it with the model. See: https://docs.djangoproject.com/en/5.0/ref/contrib/admin/#modeladmin-objects
## Configure list views
Use `list_display` to add additional fields to the view. See more at https://docs.djangoproject.com/en/5.0/ref/contrib/admin/#django.contrib.admin.ModelAdmin.list_display
## Add list filters
To filter displayed items, list fields in the `list_filter` attribute.
## Sectioning the detail view
To add sections, refer to: https://docs.djangoproject.com/en/5.0/ref/contrib/admin/#django.contrib.admin.ModelAdmin.fieldsets
## Inline editing of associated records
For inline editing of associated records, refer to: https://docs.djangoproject.com/en/5.0/ref/contrib/admin/#django.contrib.admin.ModelAdmin.inlines
Declaring inlines
- `TabularInline` (horizontal layout) https://docs.djangoproject.com/en/5.0/ref/contrib/admin/#django.contrib.admin.TabularInline
- `StackedInline` (vertical layout, default) https://docs.djangoproject.com/en/5.0/ref/contrib/admin/#django.contrib.admin.StackedInline
| samuellubliner |
1,868,126 | Understanding the Scope Chain, Scope, and Lexical Environment in JavaScript | JavaScript's handling of variables and functions can be intricate, but grasping the concepts of... | 27,544 | 2024-05-28T20:26:24 | https://bhaveshjadhav.hashnode.dev/javascript-essentials-understanding-scope-lexical-environment-and-hoisting | webdev, javascript, programming, productivity | JavaScript's handling of variables and functions can be intricate, but grasping the concepts of scope, the scope chain, and the lexical environment is essential for writing efficient and bug-free code. In this blog post, we'll explore these fundamental concepts in detail.
## What is Scope?
Scope defines where you can access a specific variable or function in your code. It determines the visibility of variables and is directly dependent on the lexical environment. There are three types of scope in JavaScript:
1. **Global Scope**: Variables declared outside any function or block. They can be accessed from anywhere in the code.
2. **Function Scope**: Variables declared inside a function. They are not accessible outside the function.
3. **Block Scope**: Variables declared inside a block (with `let` or `const`). They are confined to the block in which they are declared.
## What is the Lexical Environment?
A lexical environment is created whenever an execution context is created. It consists of the local memory along with the lexical environment of its parent (lexical parent).
### Example of Lexical Environment
```javascript
function a() {
c();
function c() {
console.log(b);
}
}
var b = 10;
a();
```
### Call Stack and Lexical Environment
Let's make a call stack diagram for the above problem:
1. **Global Execution Context**:
- `b` is declared and initialized with `10`.
- `a` is declared.
2. **Function `a` Execution Context**:
- `c` is declared.
3. **Function `c` Execution Context**:
- `console.log(b)` prints `10` as it looks up the scope chain to find `b`.
The lexical environment is the local memory combined with the lexical environment of its parent. In the example, `c()` is lexically sitting inside `a()`, which is lexically inside the global context.
## What is the Scope Chain?
The scope chain is a chain of all lexical environments and parent references. It determines the order in which variables are accessed. When a function is called, the JavaScript engine first looks for the variable in the local scope, then moves up the scope chain to the parent scope, continuing until the global scope is reached.
### Example of Scope Chain
```javascript
var globalVar = 'I am global';
function outerFunction() {
var outerVar = 'I am from outerFunction';
function innerFunction() {
var innerVar = 'I am from innerFunction';
console.log(innerVar); // I am from innerFunction
console.log(outerVar); // I am from outerFunction
console.log(globalVar); // I am global
}
innerFunction();
}
outerFunction();
```
## Hoisting with `let` and `const`
Variables declared with `let` and `const` are hoisted, but unlike `var`, they are not initialized until their definition is evaluated. This creates a "temporal dead zone" from the start of the block until the initialization is complete.
### Temporal Dead Zone
The temporal dead zone (TDZ) is the period between when a variable is hoisted and when it is initialized. Accessing a variable in the TDZ results in a ReferenceError.
### Example of Temporal Dead Zone
```javascript
console.log(a); // Uncaught ReferenceError: Cannot access 'a' before initialization
let a = 5;
```
In this example, `a` is in the TDZ from the start of the block until it is initialized with `5`.
## Summary
Understanding scope, the scope chain, and the lexical environment is fundamental for mastering JavaScript. Here's a quick recap:
- **Scope**: Defines where you can access variables and functions.
- **Lexical Environment**: Local memory plus the lexical environment of the parent.
- **Scope Chain**: The chain of lexical environments determining variable access order.
- **Hoisting**: `let` and `const` are hoisted but not initialized, creating a temporal dead zone.
With this knowledge, you can write more predictable and maintainable JavaScript code. Happy coding!
---
This post provides an in-depth look at these crucial concepts, helping you understand how JavaScript manages scope and variable accessibility. Feel free to share your thoughts and questions in the comments below! | bhavesh_jadhav_dc5b8ed28b |
1,868,125 | Understanding JavaScript Execution Context | JavaScript is a synchronous, single-threaded language. This might sound complex, but let's break it... | 27,544 | 2024-05-28T20:17:55 | https://dev.to/bhavesh_jadhav_dc5b8ed28b/understanding-javascript-execution-context-synchronous-single-threaded-nature-292c | webdev, javascript, beginners, programming | JavaScript is a synchronous, single-threaded language. This might sound complex, but let's break it down to understand what it really means and how it affects the way JavaScript executes code.
### JavaScript: Synchronous and Single-Threaded
In JavaScript, being single-threaded means it can execute one command at a time. This is in contrast to multi-threaded languages, which can handle multiple tasks simultaneously. Imagine you have a single line at a grocery store checkout – each person (or task) waits for their turn to be processed.
When we say JavaScript is synchronous and single-threaded, it means:
1. **One Command at a Time**: JavaScript can handle only one task at a time. It starts a task, completes it, and then moves on to the next one.
2. **Specific Order**: The tasks are executed in the order they appear in the code. JavaScript will not jump to the next task until the current one is completed.
### Execution Context
An execution context is the environment in which JavaScript code is executed. There are two types of execution contexts in JavaScript:
1. **Global Execution Context**: This is the default context where your code starts execution. It creates a global object (like `window` in browsers) and sets up the `this` keyword to refer to this global object.
2. **Function Execution Context**: Whenever a function is called, a new execution context is created for that function. It has its own space for variables and function-specific data.
### How It Works
When your JavaScript code runs, the JavaScript engine creates an execution context and manages the order of operations using a stack called the **Call Stack**. Here's a simplified view:
1. **Global Execution Context**: When your script starts, the global execution context is created and pushed onto the call stack.
2. **Function Call**: When a function is invoked, a new function execution context is created and pushed onto the call stack.
3. **Function Completion**: Once a function completes its execution, its context is popped off the stack, and the control returns to the previous context.
### Example
Let's look at a simple example to see this in action:
```javascript
function first() {
console.log("First function");
}
function second() {
console.log("Second function");
first();
console.log("Second function again");
}
second();
console.log("Global context");
```
Execution Order:
1. Global context starts.
2. `second()` function is called.
3. `second()` execution context is pushed onto the stack.
4. `console.log("Second function")` runs.
5. `first()` function is called inside `second()`.
6. `first()` execution context is pushed onto the stack.
7. `console.log("First function")` runs inside `first()`.
8. `first()` execution context is popped off the stack.
9. `console.log("Second function again")` runs.
10. `second()` execution context is popped off the stack.
11. `console.log("Global context")` runs.
### Conclusion
Understanding that JavaScript is synchronous and single-threaded is crucial for writing efficient code. It helps you anticipate the order of execution and manage how your functions interact. By grasping the concept of execution contexts and the call stack, you can better debug and optimize your JavaScript applications. | bhavesh_jadhav_dc5b8ed28b |
1,868,122 | Boost Your Developer Skills with Project-Based Learning | How Project-Based Learning Can Help Developers Improve Their Logical Thinking and Finish... | 0 | 2024-05-28T20:10:27 | https://ferreiracode.com/posts/boost-skills-through-project-based-learning/ | webdev, programming, productivity, learning | ## How Project-Based Learning Can Help Developers Improve Their Logical Thinking and Finish Projects
As developers, we often find ourselves stuck in the rut of learning theory without actually applying it. This can lead to a lack of confidence and a pile of unfinished projects. But what if there was a way to boost your logical thinking and develop the habit of seeing things through to completion? Enter project-based learning (PBL).
Project-based learning is a powerful approach that focuses on hands-on projects to help you understand and apply concepts in real-world scenarios. For me, this method has been a game-changer, turning abstract knowledge into tangible skills. In this post, I'll share how PBL can help you as a developer, improve your logical thinking, and, most importantly, get you to finish what you start.
### What is Project-Based Learning (PBL)?
Project-based learning is an educational approach where learning occurs through engaging with projects. Unlike traditional learning methods that often emphasize theory, PBL focuses on practical application. You learn by doing, solving real-world problems, and creating actual products.
In the context of software development, PBL can mean building a web app, developing a game, or, in my case, creating a Manga Tracker with a web scraper. The key elements that make PBL effective include:
- **Real-world relevance:** Projects are based on real-world challenges, making the learning process more engaging.
- **Active exploration:** You actively research, design, and develop solutions.
- **Collaboration:** Often, PBL involves working with others, which enhances learning through shared knowledge and experience.
- **Reflection:** Continuous reflection helps solidify what you’ve learned and how you can improve.
### Benefits of Project-Based Learning for Developers
#### Improves Logical Thinking
When you’re working on a project, you’re constantly solving problems. This continuous problem-solving process sharpens your logical thinking. For instance, in my Manga Tracker project, I had to figure out how to build a web scraper to download the most recent manga chapters directly to my Kindle. Each piece of the project presented its own challenges, from handling the web scraping process to transforming images into a PDF and sending it via email.
By building the Manga Tracker multiple times using different languages—first with JavaScript and Puppeteer, then Golang, and finally Rust—I used a familiar project to learn new programming languages. This approach forced me to think critically and make decisions at every step, significantly improving my logical thinking skills.
#### Promotes Practical Skills
PBL isn’t just about thinking; it’s about doing. You apply theoretical knowledge in practical scenarios, which helps you understand concepts more deeply. By working on real projects, you get hands-on experience with the tools and technologies that are crucial in your field. For example, while working on the Manga Tracker, I gained practical experience in web scraping, data transformation, and email automation—skills that are directly applicable to many other areas in development.
#### Boosts Confidence and Motivation
There’s nothing quite like the sense of accomplishment that comes from finishing a project. It boosts your confidence and keeps you motivated. Having completed projects to show prospective employers or clients is a huge plus. For example, my Manga Tracker wasn’t what landed me a job, but a mobile app I developed to help remember medicines did. These projects showcased my skills and helped me gain trust even when I didn't have much professional experience.
### Developing a Habit of Finishing Projects
One of the biggest challenges developers face is finishing what they start. Here’s how PBL can help you develop this crucial habit:
#### Setting Realistic Goals and Deadlines
Breaking down your project into manageable chunks with clear, achievable goals and deadlines can make a big difference. It helps prevent overwhelm and keeps you focused on making steady progress.
#### Iterative Development and Feedback
Working iteratively—developing small parts of your project, seeking feedback, and refining your approach—keeps you on track. It also ensures you’re moving in the right direction and allows for adjustments along the way.
#### Overcoming Common Obstacles
Procrastination and perfectionism are common obstacles that can derail your projects. By setting clear priorities and focusing on iterative development, you can overcome these challenges and keep moving forward.
### Structuring a Simple Project: The Manga Tracker Example
One of the projects I often use to learn new things is my Manga Tracker. The main challenge wasn't keeping my reading list up to date but building a web scraper to download the most recent manga chapters directly to my Kindle. I’ll break down this project in another blog post, but for now, let's use it as an example of how to structure a simple project.
#### Step-by-Step Guide to Project-Based Learning
1. **Choose a Project Based on Your Interests:**
- **Example:** I love reading manga, so I came up with the idea of a Manga Tracker to keep track of my reads and quickly download all manga chapters directly to my Kindle.
2. **Write Down Ideas:**
- **Example:** I brainstormed everything about the Manga Tracker, including tracking my reading list and the web scraper for downloading manga. I wrote down all ideas, no matter how difficult or trivial they seemed.
3. **Select Key Items:**
- **Example:** From the list, I picked three core functionalities: the reading list tracker, the web scraper to gather manga images, and the PDF creator to send the manga to my Kindle. This helped me focus on essential features without getting overwhelmed.
4. **Plan Each Item:**
- **Example:** For the web scraper, I detailed steps like identifying the manga on a scans site, downloading chapter images, converting them to PDF, and automating the email process to Kindle. This planning phase cleared my mind and created a roadmap.
5. **Start Small and Iterate:**
- **Example:** I began by implementing the web scraper in JavaScript with Puppeteer, then iteratively improved it by adding features and seeking feedback. Later, I rebuilt it in Golang and Rust to learn new languages.
6. **Share Your Progress:**
- **Example:** I shared updates on LinkedIn and other platforms, even when the project was incomplete. Sharing helped me stay motivated and get feedback. Most of my early projects are archived now, but I still build things for myself and share them, like my Pomodoro Timer for MacOS using Tauri and React.
By following these steps, you can turn vague ideas into concrete projects and develop a habit of finishing what you start.
### Sharing Your Projects
No matter where you are in your project, share something about it. Post an image, write a blog post, or share on social media. Let people know you’re building something, even if you think it looks ugly or incomplete. Sharing helps you stay motivated and provides valuable feedback. For example, my early projects helped me gain trust even when I didn't have much professional experience. Recently, I built a simple TUI app for managing tasks directly from my terminal and I'm planning on sharing it online.
### Conclusion
Project-based learning has been a key part of my growth as a developer. It’s helped me improve my logical thinking, develop practical skills, and finish what I start. I encourage you to find a project that excites you, break it down into manageable parts, and start building. Share | codeferreira |
1,845,535 | Ibuprofeno.py💊| #112: Explica este código Python | Explica este código Python Dificultad: Intermedio print(bool(-100),... | 25,824 | 2024-05-28T20:00:00 | https://dev.to/duxtech/ibuprofenopy-112-explica-este-codigo-python-1ffo | python, spanish, learning, beginners | ## **<center>Explica este código Python</center>**
#### <center>**Dificultad:** <mark>Intermedio</mark></center>
```py
print(bool(-100), bool(100))
```
👉 **A.** `True`, `True`
👉 **B.** `True`, `False`
👉 **C.** `False`, `True`
👉 **D.** `False`, `False`
---
{% details **Respuesta:** %}
👉 **A.** `True`, `True`
En Python los tipos de datos booleanos descienden del tipo de datos de los números. Entonces El posible representar tanto `True` como `False` como valores numéricos, donde: `True` equivale a `1` y `False` equivale a `0`.
Ahora bien, tenemos una peculiaridad con los números que sean diferentes de `1` y `0`.
Todos los numeros enteros que sean diferentes de `0` serán considerados como `True` (incluidos los valores negativos), **solo** el valor `0` equivale a `False`.
En nuestro ejemplo `-100` infiere a `True` por mas que sea negativo porque es diferente de `0` y `100` también infiere a `True` por las mismas razones.
{% enddetails %} | duxtech |
1,868,114 | Como classificar a sua linguagem - Introdução a sistema de tipos | Introdução Quando o assunto é linguagens de programação dois termos muito utilizados para... | 0 | 2024-05-28T19:49:09 | https://dev.to/terminalcoffee/como-classificar-a-sua-linguagem-introducao-a-sistema-de-tipos-kgk | braziliandevs, beginners, tutorial |
## Introdução
Quando o assunto é linguagens de programação dois termos muito utilizados para classifica-las são: fortemente tipada, e fracamente tipada, o problema com essa abordagem é que ambos são termos meio subjetivos quanto ao seu significado, o que dificulta um debate sério ao tentar classificar algo como forte ou fracamente tipado. Entretanto, a teoria sobre sistemas de tipos nos fornece conceitos mais úteis nessa tarefa de classificar uma linguagem de programação pelo seu sistema de tipos.
# TL;DR;
Podemos classificar um sistema de tipos pelas suas características:
- Se é dinâmico ou estático;
- Se é estrutural ou nominal;
- Se a tipagem é implícita ou explícita;
# Dinâmico vs estático
O primeiro critério que podemos usar para classificar propriamente um sistema de tipos, seria se o processo de checar e reforçar as restrições dos tipos ocorre em _compile-time_ ou em _run-time_.
Em uma linguagem onde a checagem durante a execução do programa, ela ocorre em _runtime_, ou seja, ela seria considerada uma linguagem dinâmica.
Da mesma forma, se a checagem ocorre antes do código rodar, apenas analisando o conteúdo do código através de uma ferramenta, seja ela um analisador estático, o compilador, um linter, e etc, ela é considerada como ocorrendo em _compile-time_, dessa forma uma linguagem onde isso acontece seria uma com sistema de tipos estático.
Linguagens dinâmicas geralmente são mais simples de executar, e por isso são associadas com curvas menores de aprendizado, além de não necessariamente exigirem que os tipos sejam declarados explícitamente (tópico que iremos abordar em breve), tornando o aprendizado inicial bem mais simples, facilitando abordagens mais interativas de desenvolvimento (escrever o programa, rodar para testar, e repetir o ciclo).
Enquanto isso, as estáticas geralmente acabam por serem um pouco mais complicadas de executar devido a exigência de uma validação quanto a se o programa está "correto" antes que ele possa ser executado, resultando nas famosas experiências onde "o código não compila", em contrapartida, oferecem uma segurança maior quanto ao programa que vai ser executado, uma vez que esses tipos de erros são pegos durante o desenvolvimento, e não de surpresa depois que o código já está rodando em produção, e algum usuário faz algo que não devia, e acaba recebendo um erro inesperado na cara.
Apesar de linguagens dinâmicas serem associadas com uma experiência de desenvolvimento (DX) melhor, as estáticas possuem uma qualidade nesse quesito bem significativa, que é a capacidade de ajudar os editores a mostrarem os erros diretamente no código que o programador estiver escrevendo, além de ajudarem ele a navegar pelo código, e proverem funcionalidades de auto-complete, devido a capacidade analisar o código estáticamente enquanto ele é escrito.
# Estrutural vs nominal
As linguagens mais famosas a serem associadas como "tipadas" ou "fortemente tipadas" como C ou Java, que acabaram por ditar parte do senso comum relacionado a tipagem, utilizavam o que é conhecido como sistema de tipos nominal, nesse caso, mesmo que dois valores sejam identicos, se eles pertecerem a tipos com nomes diferentes, então eles são de tipos diferentes, por exemplo, se você tiver duas classes com as mesmas propriedades e métodos no PHP, os objetos produzidos por essas classes não serão dos mesmos tipos, ex:
```php
class Foo
{
public function __construct(public string $property) {}
public function method(): void
{
echo $this->property;
}
}
class Bar
{
public function __construct(public string $property) {}
public function method(): void
{
echo $this->property;
}
}
function acceptFoo(Foo $foo): void
{
$foo->method();
}
acceptFoo(new Foo('A')); // Roda normal
acceptFoo(new Bar('A')); // Erro!
```
Isso ocorre pois apesar do conteúdo desses objetos ser o mesmo, eles são de tipos com **nomes** diferentes, e por isso são de um sistema **nominal** de tipos.
O contrário do sistema nominal seria o sistema estrutural, aqui se segue a filosofia do _duck typing_:
> Se algo anda como um pato, faz quack como um pato, então deve ser um pato
Dessa forma, um valor é considerado de um tipo, se a sua **estrutura** é identica a estrutura desse tipo, então no caso de linguagens como o TS, nosso exemplo anterior rodaria sem problemas:
```ts
class Foo {
constructor(public property: string) {}
method(): void {
console.log(this.property);
}
}
class Bar {
constructor(public property: string) {}
method(): void {
console.log(this.property);
}
}
function acceptFoo(foo: Foo): void {
foo.method();
}
acceptFoo(new Foo('A')); // Ok
acceptFoo(new Bar('A')); // Ok
acceptFoo({ property: 'A', method() {} }); // Ok
```
Aqui por Foo, Bar, e até o objeto literal declarado no final terem a mesma estrutura (métodos e propriedades obedecendo aos mesmos tipos), eles são considerados como do mesmo tipo, e por isso, dessa vez, a função executa sem problemas.
A comparação acaba sendo que um sistema estrutural acaba por ser mais flexível, e portanto mais amigável, enquanto um sistema nomimal acaba por ser um pouco mais rígido, embora nesse caso, ambos não serem diretamente opostos em seus prós e contras, pois existem muitas situações onde ter um sistema estrutural acaba sendo uma vantagem, geralmente em código que usa o paradigma funcional acaba por ser o caso, e existem situações onde o sistema nominal acaba por ser melhor como quando se tem valores "do mesmo tipo", mas com semântica diferente na aplicação, e por isso necessitam que o nome do tipo seja levado em consideração também, ex: moedas e números inteiros, seriam number em TS, mas possuem semânticas completamente diferentes, e não poderiam ser utilizados intercambiavelmente.
# Implícito vs Explícito
Para nosso último critério podemos observar se a tipagem é explícita ou implícita, o que significa verificar se a linguagem necessita que todos os tipos sejam declarados (explícita), ou se podemos omitir a declaração deles, dessa forma deixando que a linguagem advinhe qual o tipo (implícito), funcionalidade também conhecida como inferência de tipos.
Em linguagens como o Java, antes da introdução do `var`, era necessário que você declarasse o tipo de tudo, variáveis, parâmetros, anotações de retorno e etc. Ex:
```java
class Point {
public int x;
public int y;
public Point(int x, int y) {
this.x = x;
this.y = y;
}
Point move(Point to) {
int x = this.x + to.x;
int y = this.y + to.y;
return new Point(x, y);
}
}
```
O que tem o benefício de garantir que se um valor errado foi inserido/retornado em qualquer uma dessas ocasiões, um erro vai ser desparado logo naquele ponto, além de deixar o código auto-documentado, já que os tipos estão explícitos para qualquer um que ler aquilo ler, assim já obtendo várias informações só de ler por cima o código.
O problema é que essa abordagem torna o código muito verboso, além de muitas vezes forçar com que o programador digite código que a acaba por dar a sensação de ser repetitivo, chato, ou desnecessário, uma vez que o tipo correto parece óbvio, e a linguagem até mesmo poderia advinhar qual seria o tipo nesse caso.
Sendo assim, quando uma linguagem possui suporte a inferência de tipos, ela tenta advinhar o máximo possível sobre a tipagem das coisas com base no código já escrito, e assim reforça a tipagem mesmo que o programador não tenha, de fato, tipado nada ainda, ex:
```ts
class Point {
constructor(
public x: number,
public y: number
) {}
move(to: Point) {
const x = this.x + to.x;
const y = this.y + to.y;
return new Point(x, y);
}
}
```
Aqui, apesar de termos que tipar algumas coisas, o TypeScript tenta adivinhar boa parte dos tipos utilizados nesse código, por exemplo inferindo qual seriam os tipos das constantes `x` e `y`, além do tipo de retorno do método `move`.
A vantagem é uma DX bem melhor, uma vez que a linguagem trabalha para te ajudar ao invés de fazer você digitar tudo, muitas vezes sendo até um fator que faz com que pessoas que não gostem de tipagem pelo fato de considerarem uma tarefa que deixa o código muito verboso ao mesmo tempo que não tem benefícios que compensem isso, começarem a gostar das vantagens de um sistema estático, graças a implementação de um sistema onde a tipagem é implícita na maioria dos casos também.
A desvantagem seria que ao confiar demais na linguagem, algumas vezes pode se tornar mais difícil de identificar erros de tipagem, pois eles vão ocorrer em outros lugares, além de tornar a função menos documentada, apesar do código mais limpo e conciso.
# Conclusão
Ao utilizarmos esses 3 critérios, conseguimos descrever muito melhor as capacidades de uma linguagem e de forma bem mais objetiva, além de poder lançar um julgamento mais adequado quanto as capacidades disponíveis em uma linguagem ou outra.
Normalmente o termo fortemente tipado é relacionado a linguagens estáticas e explicítas, enquanto o termo fracamente é relacionado a linguagens dinamicas e implícitas, mas ainda existem nuances que variam de pessoa para pessoa, então fora que cada critério discutido ao longo deste artigo pode ser misturado com os demais na mesma linguagem, portanto dificultando a classificação entre forte ou fracamente tipado, pois a linguagem pode ser mais permissiva ao ser estrutural, mas mais rigída ao também exigir tipagem explícita por exemplo.
Assim, na próxima vez que for discutir o mérito, tente descrever a tipagem de uma linguagem com esses critérios, e acredito que será uma abordagem bem mais frutífera.
Não se esqueça de compartilhar esse artigo se ele te ajudou a aprender algo novo, até a próxima e deixe nos comentários o seu tipo favorito.
# Links que podem te interessar
- [Wikipedia sobre forte ou fracamente tipado](https://en.wikipedia.org/wiki/Strong_and_weak_typing);
- [Wikipedia sobre estático vs dinâmico](https://en.wikipedia.org/wiki/Type_system#Static_type_checking);
- [Wikipedia sobre tipagem explícita](https://en.wikipedia.org/wiki/Manifest_typing);
- [Wikipedia sobre tipagem implícita](https://en.wikipedia.org/wiki/Type_inference);
- [Wikipedia sobre sistema nominal](https://en.wikipedia.org/wiki/Nominal_type_system);
- [Wikipedia sobre sistema estrutural](https://en.wikipedia.org/wiki/Structural_type_system);
- [Baeldung sobre estático vs dinâmico](https://www.baeldung.com/cs/statically-vs-dynamically-typed-languages);
- [Questão do Stackoverflow sobre estático vs dinâmico](https://stackoverflow.com/questions/1517582/what-is-the-difference-between-statically-typed-and-dynamically-typed-languages);
- [Questão do Stackoverflow sobre explícito vs implícito](https://stackoverflow.com/questions/1931654/what-is-the-difference-between-latent-type-and-manifest-type#:~:text=In%20explicit%20%2F%20manifest%20typing%2C%20the,are%20thus%20implicit%20or%20latent.);
- [Artigo interessante sobre vários aspectos de sistemas de tipos](https://nullprogram.com/blog/2014/04/25/);
- [TS sobre sistema estrutural](https://www.typescriptlang.org/play?#code/PTAEBUE8AcFMGUDGAnAltALqVBnUBDUeDZAV0Q1OXwBsIZYjIcNYBbAOlAEFQWyKVWqAwMAUCD7NWbUG1j4AdngwALfFgDuq2ItCIA9m2j40igOYiGOADT04SNJlAHFNSBLAZ8Aa1h5URQwDAkRDUiCRHTl2ACNYZDxXKMZROA4xTwhVXGwAvUMg6hYREMUjQOE0xhxpdltQbQTGSANSLPCaABN9ZAVWEU0Q6rxY0ixOnvKsfBwcVHM9NXZS0AVEVSyDZeQueFhGWAAPfGMaWAAucrZKmgBaNMDzTMkAMQNkNZOz2DtlnFSQ2wQQSADN8Ih-AQ+vojNBzqx3FkSEocKCEtRYudgQQ+CRyJRqHRqlIWOwLplAqxkODIaAAEK0OgAbzEoFAXVQp1g1IuoEUpDY8WQAG4xABfMRUsEQxjwaA6GGs9mc7m8-mC4ViyViBGgWJMvmMmh0AC8oGZHK58nVAEYAAygcVivU4BXNPnyxWMc2W1U2hJ8gBMjudmTd3tA5oNJrFMbNfHdfTFWQAkqDGox8F0eoFcSTtKgNniBISmZBYUF8IE8EyXKDkdF5EKEkkM8a6Eoel7mn8dHpUDMaDgQoglPrYFkAVhghPcfGXJ8I80MlKQTTZRBSPELWyrWrAxqW6K9+cLGo+QLj9rMnrKPE+eBtz6LfuA8g+bag3Yz+YL6AAGYnRTe8X3jOM63NUCU0kelYDHUgAXnOsugMKFplAdQADcs1AX81D7XRsAmJQMPiLJZnmRZYB6WdlhEZ9QCw0wuSxWAuAACQMTRYBw5A7DrAwM3o5thRwLZ2zrUxGBrVAulSZ8BMUHoR2I-Rxx3SiFkUGjV0kKAHBQdAsFyQxjBYiw1ghVQYmPHF6JJfBzGrZQMCydYbO2RVVj41BQQrZZUE+WAAEdSFoQdID0sBeFBCIKFQZJcnHAxYgAK3gky9AAKXwZjHGMghlLU0y4WkrosjzQh5huGhTFAcEcByVwuAAdUHTydNARDYDiuhjhREQ0EQHxoTaZTG0YExqDYHAKV1Hlen6WAOyjUAAAp-R5Q8r2FABKKMAD4Nr9a1ts+cU9pdRaUGWnsYXNTazvVXaEjsHrU0UDZ-D5WIDAMc4lAO01juVUA+kJPRToPD9uoBT7vrwAB+N9ztAAAqUB7Q4ACAE5QD5LbqWAiUU1ujQECTF9ydYDsxRplbIKWin7tgGCwAMhAjOcTRUBNAgTW4jbXuQA7Z1C8K6HWkW7D+gGFEUPbKqWaJpphhoxiwDDpc1N79X+wHFdAO5jp148layTmCp5vm6E5HAx2QWjojlw37OiUEgpKLTFnkIIsniBCkMHAByPA+IrMy2GSUEPlAXL8u5iYDHk1YcB8dBQBMOYniyNXZsafsUkgEOYQwnSaN0l4wHeYLvnhVJolMagS7wWPkAAUWssP1JNA0Rsw2Yoj6KbTFOWwsmYmhSF+YF5KOIrncYPrO2QFvjewDMraTq0ukUEO3MkHBSGgaAPiwe3Hc5Sz8-Ohplj0VpSEaNpukHnDSmVxBp9T3iEgrAwmBEpLBCGwXwjdl7xQwMAvAYCMDFhPvNAA2gzDs61bR7TsKgpk60gx7QALocHbl3DY611rxjsAAfUCPPKh8YcDA1BnuQoI5zgcBoAYcw5CmRXQlLwrIAA5EIrhGAVy6CodQGBoqgAAEo8ioEsaw0JUh9Apj0GgqA-AuHSplBoXYioVk5KCdEfQvr+AojCMy00aKNA6ikPg3JtEZQoGsMKEVRDg1IOcWsf0cKrj1AzORXRVqPSJjtXWosjonVRtSLBAMPh8gAER9C6Ikp0-DsH83NIEmidMxA5OCUzTJNB2agFapGeintEgzBzr7XQWgPg+DwOtZYFY-pqHfowMJosA7jHsQCQoPRUL+H3lgFpLsUJoRwKMzpuJDAcNFhkIAA);
- [TS sobre sistema nominal](https://www.typescriptlang.org/play?#code/PTAEEFQOwewWwJZQIYBtQBcCeAHApqAM5aEZ5yhx7JSGYAWyGo1AxvZrgQnQK5QIAjrzwAoEKBoATFgDc8UUAgBmnfHUbyGBQsiqgpTZKCwxeoVjVjNkhQggDmUcWGSsATjDtq8hAHSiLqAAKlwAyh4IOBgA5HTY+EQkZBQ8RBjuvKwYvO5oADSgAO70COyU1LRBKto+SnSEjPgyqAgA1gTGUllthQixdF09fqAAkqrIQQ4wXgSMg6joGPQ6ep0YGQgARrxkg4MGPYXLCko2qIQw1QfdrG0jAJpmFjSgqNTuinAw7nN4vwAuFgADz0OHeANImWyuTQAFoEkgHIEJMFSnRLIpNAQpHkils3G1CIVlD8QWD3tpfpJqZZCL4giV-p10u4kaAyVBeHAtv8XljkFpCPhWAg0BYYFAyMCbFAZKZeEEpJKYswijRmBgYHI+XBkB1arI0CJ4nlaMp-nktu8RgAxH5BPCguDgvAAlxBOGgUAAVXp7jGUBwu1AYU2UAcdAAFPxdBaAJSe73BM2EVBMBCS0PhyNJ33+sZSBQYFRlDNZgBy3N57kIefArFYvjowRgHSqQQA6gRMaAHHhmN9SBzVCdQEbUCJQMpPBRjLBECgllwgsRSORiv0OMZWhtKVt+iOQRljKwYEWAl28DFqdN2VrQLx6ZJFEgyLW8NlM0ufIUilvJEfARhDECQz1oE83yURQx1JdwKBgCZQBwTx8HcbAXkWPAZAAfRwrYzRkKNlh4a4JSgeQpW-eNilKco9Q6OhDwQF0vHsa0CAfWx7CcSQglgeDxShe9tWMAA1NAEEMMgpFGINdjDNkI0vBICAk1ppOwuTgwwRT2QAXlZdkADJQAAb1APCCOkIEACI-T5bSQwABS8Zh1Kk8soFs0AAF8AG4UTAbtN0WR9n2MZR+C-LMHxPc0fjnIyI0wK4JHEyTNNk+TdJzUAvR2TUVmQmAoKKH5lmgGASwjMjliYYpr2pAArJ9mBwshFiRHCQnCSJogYBr+jiTBMjwS9wOHCdPLIBz3Cc5hDKjJAdKBYSIxo-SAD5zNEb1JuYewXXeDysoW0BDJW3Y-F+cE3DwKNgAAHQAHmABxClswATIls+NAu9X4ck+IgWNdU6mC0nLJDocGZIWvSI0CgKgtACsYCKRr+QsX4IenaKS0lOgSjKDh-zCyVUCwSRGzwaIgjMAMoDwDGFyQcVVMKaQqqKgh+yZvJ0HWhwfAmwnmBQt8KzWC7QCjFAqCBWHIZ0hGHE2nazL28jLhtVAYAcOW1j+0RkaCe0AydCk8EKFZfhGy59FjZALWgnTp1nQCn3+Qo71qiRlk8XgHA4MdpukskuZORReXZNA9aKbDUtAXlkKUmT3VEA7XZDQzbLQf4MCjGIthgLYtipjBkA4wgYnjWzAqzsOIeyt3DKb2b-QW5acuNiWpSlqgo3b5XdmNoIAHkYOK6rbdARg5UKHBuPvYr+DhYeZCF1Kgj7jAB4IMn0DyHgWTPF0EHeC33E8dwM93-fu50seJCecxexxmRT3gFC8BWWgEC0DAeQ7hZAIGZkeE4SoVAWl+FKYoyASBJw8NQMgVVFzsy4MSF8MgTgIHcEEE8RY4SIWUExKeaQAAsAAGKhEo4BUDgXrFKABxfoAAJXgWx6iEBEO6EAQR6AbBwIQAEIAHBbk4X4M+wAACyZRPCXGUBgYAoR8ARDZNEYAPAeG+GAAAJioXoj06U5QMDSDgNy9RAIOBxodbkep3BYD4cAARQiREgEQOwNAAAvfOdwEBSPgMAVmS4ES4CRHCJAYT1D9WUaIIAA);
Ass: Suporte Cansado... | terminalcoffee |
1,868,115 | Best Productivity Tools for Small Teams of 2024 | In today's fast-paced work environment, small teams need to leverage technology to stay agile and... | 0 | 2024-05-28T19:47:47 | https://blog.productivity.directory/best-productivity-tools-for-small-teams-1add7b5ab28f | productivity, smallteam, productivitytools | In today's fast-paced work environment, small teams need to leverage technology to stay agile and productive. Efficient collaboration and streamlined workflows are essential for success, particularly for teams that might not have access to the resources of larger corporations. This article explores some of the [best productivity tools](https://productivity.directory/) designed to enhance the effectiveness of small teams across various functions.
Asana --- Task and Project Management
-----------------------------------
For teams looking to manage projects and tasks efficiently, [Asana](https://productivity.directory/asana) stands out as a top choice. It offers a user-friendly interface and powerful features that help teams organize projects, assign tasks, set deadlines, and track progress. Asana's versatility makes it suitable for everything from simple to-do lists to complex project timelines, ensuring that everyone is aligned and accountable.
Slack --- Communication
---------------------
Communication is vital for any team, and [Slack](https://productivity.directory/slack) provides a robust platform for both direct messaging and group discussions. Slack channels can be organized by topic, project, or department, making it easy to keep relevant conversations and files in one place. With its integration capabilities, Slack can connect with many other tools, bringing all communication to a central hub.
Trello --- Visual Project Management
----------------------------------
[Trello](https://productivity.directory/trello) uses a card-based system that is intuitive and highly visual, making it ideal for managing projects and workflow processes. Teams can customize boards according to their needs, whether for sprint planning, content calendars, or bug tracking. The simplicity of dragging and dropping cards across lists and boards makes Trello an excellent tool for teams that prioritize visual organization.
Zoom --- Video Conferencing
-------------------------
With remote work becoming more common, having a reliable video conferencing tool like [Zoom](https://productivity.directory/zoom) is essential. Zoom offers high-quality audio and video, screen sharing, and other interactive features, facilitating virtual meetings and webinars effectively. Its ease of use and scalability make it a go-to choice for teams needing to maintain face-to-face communication remotely.
Google Workspace --- Integrated Office Suite
------------------------------------------
Google Workspace (formerly G Suite) provides a comprehensive suite of office tools including Gmail, Docs, Sheets, and Slides. What makes Google Workspace especially powerful for small teams is its seamless integration and collaboration features. Real-time editing, commenting, and easy sharing options simplify the process of working together on documents and spreadsheets.
Notion --- All-in-One Workspace
-----------------------------
For teams that require a flexible platform to create, plan, collaborate, and get organized, [Notion](https://productivity.directory/notion) offers a versatile workspace. It combines notes, databases, kanban boards, wikis, and calendars in one tool, providing an all-in-one solution for teams looking to consolidate their work tools into a single, streamlined platform.
LastPass --- Password Management
------------------------------
Security is critical for every team, and managing passwords efficiently can be challenging. [LastPass](https://productivity.directory/lastpass) offers a secure way to store and manage login information. By ensuring team members have access to the tools they need without compromising security, LastPass helps small teams maintain strong passwords without the hassle of remembering each one.
Airtable --- Flexible Database Management
---------------------------------------
[Airtable](https://productivity.directory/airtable) mixes features of a database with the simplicity of a spreadsheet. It is exceptionally well-suited for managing complex projects that involve various data types and extensive collaboration. Its interface allows teams to organize work, track inventory, plan events, or manage customer relationships in a uniquely customizable way.
Conclusion
==========
Choosing the right [productivity tools](https://productivity.directory/) can significantly impact a small team's efficiency and effectiveness. Tools like Asana, Slack, Trello, Zoom, Google Workspace, Notion, LastPass, and Airtable offer different capabilities that can cater to various needs, from project management and communication to comprehensive office suites and secure password management. By integrating these tools into their workflows, small teams can streamline their processes, enhance collaboration, and boost productivity, setting the stage for greater success in their endeavors.
-----
Ready to take your workflows to the next level? Explore a vast array of [Team Collaboration Softwares](https://productivity.directory/category/team-collaboration), along with their alternatives, at [Productivity Directory](https://productivity.directory/) and Read more about them on [The Productivity Blog](https://blog.productivity.directory/) and Find Weekly [Productivity tools](https://productivity.directory/) on [The Productivity Newsletter](https://newsletter.productivity.directory/). Find the perfect fit for your workflow needs today! | stan8086 |
1,868,112 | Is avatrade’ Good for Beginners? | Introduction Entering the world of online trading can be daunting for beginners, and selecting the... | 0 | 2024-05-28T19:42:00 | https://dev.to/__a601e7f8fa67c9/is-avatrade-good-for-beginners-1011 |
**Introduction**
Entering the world of online trading can be daunting for beginners, and selecting the right broker is crucial for a smooth and successful start. Avatrade, a globally recognized brokerage firm, has been a popular choice for many. Established in 2006 and headquartered in Dublin, Ireland, avatrade offers a wide range of financial instruments, including forex, commodities, cryptocurrencies, stocks, indices, and more. But is avatrade suitable for beginners? This article delves into various aspects of avatrade to determine its appropriateness for novice traders.
**User-Friendly Interface and Platform Options**
[Is avatrade good for beginners](https://tradingcritique.com/broker-review/is-avatrade-good-for-beginners/), One of the most significant factors for beginners is the ease of use of avatrade trading platform. Avatrade scores highly in this regard, offering multiple trading platforms tailored to different types of traders. Their primary platform, avatradego, is designed with an intuitive interface, making navigation straightforward even for those new to trading. It includes features like one-click trading, advanced charting tools, and a dashboard that provides real-time market data.
For those preferring desktop applications, avatrade offers metatrader 4 (MT4) and metatrader 5 (MT5), industry-standard platforms known for their robustness and comprehensive analytical tools. Both MT4 and MT5 are equipped with automated trading capabilities and a variety of technical indicators, which are essential for developing trading strategies.
Moreover, avatrade's webtrader allows users to trade directly from their browser without the need for downloading any software. This platform is user-friendly, with a clean interface that simplifies the trading process. These options provide beginners with flexibility, enabling them to choose a platform that suits their preferences and trading style.
**Educational Resources**
Education is key to successful trading, and avatrade excels in providing comprehensive educational resources. Their Education Center includes a variety of materials such as ebooks, video tutorials, webinars, and articles covering a wide range of topics from basic trading concepts to advanced strategies.
For beginners, avatrade offers an introductory course that explains fundamental trading principles, market analysis techniques, and risk management strategies. This course is particularly beneficial as it lays a solid foundation for new traders, helping them understand how the markets operate and how to develop a trading plan.
Additionally, avatrade's regular webinars are hosted by experienced traders who share insights and practical tips. These webinars cover current market trends and provide real-time analysis, which is invaluable for beginners looking to learn from seasoned professionals.
**
Demo Account**
A key feature that makes avatrade suitable for beginners is the availability of a demo account. This account allows novice traders to practice trading with virtual money in a risk-free environment. The demo account simulates real market conditions, giving users a feel for live trading without the fear of losing real capital. It’s an excellent way for beginners to test their trading strategies, understand how different financial instruments work, and build confidence before transitioning to a live account.
**Customer Support**
For beginners, having access to responsive and helpful customer support is crucial. Avatrade offers multilingual customer support available 24/5 through various channels, including live chat, email, and phone. This accessibility ensures that beginners can get prompt assistance with any issues or questions they may encounter.
Moreover, avatrade's comprehensive FAQ section addresses common queries about account setup, platform usage, deposits, withdrawals, and more. This resource can often provide quick answers without the need to contact customer support directly.
**Regulatory Compliance and Security**
Security and trustworthiness are paramount when choosing a broker, especially for beginners who may be more vulnerable to scams. Avatrade is well-regulated by several financial authorities, including the Central Bank of Ireland, the Australian Securities and Investments Commission (ASIC), the Financial Sector Conduct Authority (FSCA) in South Africa, and the Financial Services Commission (FSC) in the British Virgin Islands. This multi-jurisdictional regulation ensures that avatrade adheres to stringent standards of financial integrity and client protection.
Avatrade also employs advanced security measures, such as SSL encryption, to safeguard clients' personal and financial information. Furthermore, client funds are held in segregated accounts, providing an additional layer of protection in the unlikely event of the broker's insolvency.
**
Competitive Spreads and Leverage**
Cost is a critical consideration for any trader. Avatrade offers competitive spreads, which are essential for beginners who may not have substantial initial capital. Lower spreads mean lower trading costs, allowing beginners to retain more of their profits.
In terms of leverage, avatrade provides up to 30:1 for retail clients in compliance with regulatory guidelines. While leverage can amplify profits, it also increases the risk of losses. Therefore, avatrade ensures that beginners understand the risks associated with leverage through their educational resources and risk warnings.
**
Variety of Tradable Instruments**
Diversification is a fundamental principle in trading, and avatrade offers a broad spectrum of financial instruments. Beginners can trade forex, stocks, commodities, indices, cryptocurrencies, and more. This variety allows novice traders to explore different markets and find the ones they are most comfortable with.
Avatrade also offers access to trading instruments through Contracts for Difference (cfds), which enable traders to speculate on the price movements of assets without actually owning them. This flexibility is particularly beneficial for beginners, as it allows them to engage in markets with lower capital requirements.
**
Automated Trading and Copy Trading**
Avatrade supports automated trading through its integration with MT4 and MT5 platforms. Beginners can utilize Expert Advisors (eas) to automate their trading strategies. This feature is particularly useful for those who may not have the time or experience to actively manage their trades.
Additionally, avatrade offers a copy trading service through its partnership with zulutrade and duplitrade. Copy trading allows beginners to mirror the trades of experienced and successful traders. This can be an effective way for novices to learn trading strategies and potentially earn profits by leveraging the expertise of seasoned traders.
**
Conclusion**
Avatrade stands out as a highly suitable broker for beginners due to its user-friendly platforms, extensive educational resources, demo account, robust customer support, regulatory compliance, and competitive trading conditions. The availability of diverse trading instruments, automated trading options, and copy trading services further enhances its appeal to novice traders.
While avatrade provides numerous advantages, it is essential for beginners to approach trading with caution. Adequate education, practice, and risk management are crucial for success in the financial markets. Avatrade’s comprehensive offerings make it an excellent choice for those starting their trading journey, providing the tools and resources necessary to develop skills and build confidence in the world of online trading. Please visit [https://tradingcritique.com/broker-review/is-avatrade-good-for-beginners/](https://tradingcritique.com/broker...d-for-beginners/) more for details
| __a601e7f8fa67c9 | |
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1,868,109 | Load .env using Config Module in NestJS | Love to work with you, You can hire me on Upwork. We are moving towards something that will give us... | 27,543 | 2024-05-28T19:37:04 | https://dev.to/depak379mandal/load-env-using-config-module-in-nestjs-eeo | typescript, node, javascript, nestjs | Love to work with you, You can hire me on [Upwork](https://www.upwork.com/freelancers/~011463d96b5b87d7ff).
We are moving towards something that will give us a very good idea how to maintain our all global environment variable. NestJs have solution library for that.
```bash
npm i --save @nestjs/config
```
We will have config folder inside modules that will contain all the config from .env in separate files according to concern, i.e., database env variables will be in `database.config.ts` and get imported from .env file from local. `@nestjs/config` loads data from .env file, but we can actually define from it can fetch more variables according to our requirement. But I would suggest to use only .env as it is very easy to understand and maintain in between developers.
Below just an example how you can use and register Config Module from NestJS standard config library to maintain the segregation between different types of .env variable and can use them accordingly in any module as ConfigModule. Starting this process with defining some config variables in src/modules/config/app.config.ts and src/modules/config/database.config.ts. app.config.ts will contain some normal global metadata for app and database.config.ts will contain data related to database. They both are defined below.
```typescript
// src/modules/config/app.config.ts
import { registerAs } from '@nestjs/config';
export default registerAs('app', () => ({
nodeEnv: process.env.NODE_ENV,
name: process.env.APP_NAME,
workingDirectory: process.env.PWD || process.cwd(),
port: process.env.APP_PORT,
}));
```
```typescript
// src/modules/config/database.config.ts
import { registerAs } from '@nestjs/config';
export default registerAs('database', () => ({
url: process.env.DATABASE_URL,
}));
```
And inside src/modules/config/index.ts we will export them as an array So they can be loaded in ConfigModule in app module.
```typescript
// src/modules/config/index.ts
import appConfig from './app.config';
import databaseConfig from './database.config';
export const configLoads = [databaseConfig, appConfig];
```
Now we have to load them in app module, App module is center of everything, So to use every module in system you have to register it there. We will import config module there, and we will go with two types of module, both are global and normal modules. Both will have different array, so we will now have very clear understanding which modules’ feature can be used as global.
```typescript
// src/modules/app/app.module.ts
import { Module } from '@nestjs/common';
import { ConfigModule } from '@nestjs/config';
import { configLoads } from '../config';
const modules = [];
export const global_modules = [
ConfigModule.forRoot({
load: configLoads,
isGlobal: true,
envFilePath: ['.env'],
}),
];
@Module({
imports: [...global_modules, ...modules],
})
export class AppModule {}
```
To define `ConfigModule` as global, we have passed `isGlobal` as true and we also passed our `configLoads` with `envFilePath` but you don’t have to pass .env separately, it automatically loads .env for us. We have used `forRoot` function to registering the module. Most of the module does provide us these type of interface to register them.
Now time to use them for use cases, We are going to use port from app config in main.ts to set port dynamically from .env file for application.
```typescript
// src/main.ts
import { NestFactory } from '@nestjs/core';
import { AppModule } from './modules/app/app.module';
import { ConfigService } from '@nestjs/config';
async function bootstrap() {
// created application instance using NestFactory
const app = await NestFactory.create(AppModule);
// getting configService from application
// to fetch port from app.config.ts config load
const configService = app.get(ConfigService);
// used the port value here
await app.listen(configService.get('app.port') || 8000);
}
bootstrap();
```
Now we can define `.env` file in our working directory that will hold our environment variables that can be used in further application.
Below is a sample `.env` file you can use.
```ini
NODE_ENV=development
APP_PORT=8000
APP_NAME="NestJS Series"
# Database Configuration
DATABASE_URL=postgresql://localhost:5432
```
After adding .env file run `npm run start:dev` it will show you output, you can see it is running without error.
In the next article, we will see how we can utilize particular .env variables inside other modules using `ConfigService` injection through `TypeORM` introduction.
Thank you for reading, see you in the next. | depak379mandal |
1,868,108 | Java String Management: String Pool vs String Heap Explained | In Java, strings are one of the most commonly used data types. To optimize memory usage and improve... | 0 | 2024-05-28T19:29:55 | https://dev.to/nrj-21/java-string-management-string-pool-vs-string-heap-explained-p0a | In Java, strings are one of the most commonly used data types. To optimize memory usage and improve performance, Java employs a concept known as the String Pool. This blog post will explain the String Pool and String Heap, using a simple code example to illustrate these concepts.
#### Code Example
Let's start with a basic Java program that demonstrates different ways of creating strings and compares them using the `==` operator and the `.equals()` method.
```java
public class Main {
public static void main(String[] args) {
String s1 = "Hello";
String s2 = "Hello";
String s3 = new String("Hello");
String s4 = new String("Hello");
System.out.println(s1 == s2); // true
System.out.println(s1 == s3); // false
System.out.println(s3 == s4); // false
System.out.println(s1.equals(s2)); // true
System.out.println(s1.equals(s3)); // true
System.out.println(s3.equals(s4)); // true
}
}
```
#### String Pool
The String Pool, also known as the interned string pool, is a special memory region where Java stores string literals. When you create a string literal, Java first checks if the string already exists in the pool. If it does, it returns the existing reference; if not, it adds the new string to the pool. This helps save memory by avoiding the creation of multiple instances of the same string.
In the code above:
- `String s1 = "Hello";`
- `String s2 = "Hello";`
Both `s1` and `s2` point to the same string in the String Pool. Therefore, `s1 == s2` returns `true` because both references point to the same object in memory.
#### String Heap
When you create a string using the `new` keyword, Java creates a new string object in the heap memory, even if an identical string exists in the String Pool. The heap is a larger memory area where all Java objects, including strings created with `new`, are stored.
In the code above:
- `String s3 = new String("Hello");`
- `String s4 = new String("Hello");`
Here, `s3` and `s4` are two different objects in the heap, each containing the string "Hello". Therefore, `s3 == s4` returns `false` because they are distinct objects.
#### Comparing Strings
Java provides two ways to compare strings:
- The `==` operator checks if two references point to the same object.
- The `.equals()` method checks if two strings have the same value.
In the code example:
- `s1.equals(s2)` returns `true` because both strings have the same value "Hello".
- `s1.equals(s3)` returns `true` because both strings have the same value, despite being different objects.
- `s3.equals(s4)` returns `true` for the same reason.
However, using `==`:
- `s1 == s2` returns `true` because both refer to the same object in the String Pool.
- `s1 == s3` returns `false` because they refer to different objects (one in the pool, one in the heap).
- `s3 == s4` returns `false` because they are different objects in the heap.
#### Conclusion
Understanding the String Pool and String Heap is crucial for writing efficient Java code. The String Pool helps save memory and improve performance by reusing immutable string objects, while the String Heap provides space for dynamically created strings. Using the `==` operator for reference comparison and the `.equals()` method for value comparison allows developers to correctly handle strings based on their specific needs. By leveraging these concepts, you can write more efficient and reliable Java programs. | nrj-21 | |
1,868,107 | Getting started with Nest JS | Love to work with you, You can hire me on Upwork. You can just have a look into NestJS doc for more... | 27,543 | 2024-05-28T19:26:12 | https://dev.to/depak379mandal/getting-started-with-nestjs-1jhp | typescript, node, javascript, nestjs | Love to work with you, You can hire me on [Upwork](https://www.upwork.com/freelancers/~011463d96b5b87d7ff).
You can just have a look into NestJS doc for more basics but yeah we will be covering all over the tutorial series. It is a practical guide to understand whole NestJS framework for beginner and intermediate to advanced.
Before anything else we need a starting point and NestJS covered that for us. We can use their CLI tool to create new project. First, we need to install nest CLI as global command. You can use the below command to install and start your own NestJS project.
```bash
npm i -g @nestjs/cli
nest new nestjs-series
```
Now we have a project, just open it up your liked text editor, I am using VS Code. Defining a layout/architecture of project is very crucial part, you can see src folder inside just create this particular folder and file structure that we will be using for entire project.
```bash
src
├── entities
├── main.ts
└── modules
├── app
├── auth
├── config
├── database
├── mail
├── media
└── user
```
Let me describe them one by one, entities will have all the models/entities that will take care of our communication with DB and those will be injected accordingly into services as used for. We will be discussing more on Dependency Injection and services and many more things coming in this series.
What we want to achieve
We want to achieve a boilerplate or small project that will be guided to understand whole NestJS frameworks. NestJS is more like library instead of framework not as framework as it does provide you very much flexibility in terms of everything you wanted to achieve in any way.
So what we want to create is very important to even start any project. Because without what you want to build, doing anything is time taking and dumping things to create a pile of bugs.
Let us start with some API doc, what we wanted to achieve in this series. I will not be able to write e2e test cases as it will be slowing down our series progress.
Here are our APIs’ and there documentation to be made, we can first define the Auth API docs that we can start our work with
1. Register a user
```json
POST /v1/auth/email/register
// body
{
"email": "example@danimai.com",
"password": "Password@123",
"first_name": "Danimai",
"last_name": "Mandal"
}
// response code
201 Created Successfully
```
2. Verify email address
```json
POST /v1/auth/email/verify
// body
{
"verify_token": "vhsbdjsdfsd-dfmsdfjsd-sdfnsdk"
}
// response code
200 Verified Successfully
```
3. Login user
```json
POST /v1/auth/email/login
// body
{
"email": "example@danimai.com",
"password": "Password@123"
}
// response code
200 Logged in Successfully
// response body
{
"auth_token": "vhsbdjsdfsd-dfmsdfjsd-sdfnsdk"
}
```
4. Send verify email
```json
POST /v1/auth/email/send-verify-email
// body
{
"email": "example@danimai.com"
}
// response code
204
Sent Verification mail.
```
5. Request reset password
```json
POST /v1/auth/email/reset-password-request
// body
{
"email": "example@danimai.com"
}
```
6. Reset Password
```json
POST /v1/auth/email/reset-password
// body
{
"password": "Password@123",
"reset_token": "vhsbdjsdfsd-dfmsdfjsd-sdfnsdk"
}
```
7. Log out user
```json
GET /v1/auth/logout // authenticated route
```
Now as we go ahead we need more of brain mapping structure that we wanted to create modules for. I also wanted to explain the structure that we are going to use. So the list of what we require are and what we are going to
1. validation
class-validator and class-transformer those are two libraries we are going to use for validation, so we can just run
```bash
npm i --save class-validator class-transformer
```
2. Swagger doc
We have very cool library from NestJS that handles all our requirement by attaching Swagger decorator in validator classes, and we can just use that as extension not as whole separate setup that requires maintenance. You can run below command to install swagger library by NestJS.
```bash
npm install --save @nestjs/swagger
```
3. SQL ORM (TypeORM)
We are going to use TypeORM as it supports very well with NestJS, but I would suggest Drizzle or Knex Or anything else that are very fast and allow us more control over raw SQL. But you also have to remember TypeORM is not enemy, you don’t have to migrate to any other ORM or library if you don’t face any critical issues. To install TypeORM use the below command. The command includes TypeORM, TypeORM wrapper for NestJS and pg driver for PostgreSQL.
```bash
npm install --save @nestjs/typeorm typeorm pg
```
4. Platform (Express)
Indeed, NestJS is a separate framework, but It uses platform library like express or Fastify to use to run everything. NestJS actually provides its own wrapper to run everything. We will go forward with express.
```bash
npm i @nestjs/platform-express // it should be installed with nest new command
```
Above are basic library we need to proceed Or to just gain more idea what are we dealing with. In the next article, we will set up things with TypeORM and create some commands to run migration. We will go over each of the things mentioned above, So see you in the next.
Code for every article are provided in this [repo](https://github.com/danimai-org/nestjs-series). | depak379mandal |
1,868,105 | Getting started with NestJS | Love to work with you, You can hire me on Upwork. You can just take a look into NestJS doc for more... | 0 | 2024-05-28T19:26:12 | https://dev.to/depak379mandal/getting-started-with-nestjs-2m7d | typescript, node, javascript, nestjs | Love to work with you, You can hire me on [Upwork](https://www.upwork.com/freelancers/~011463d96b5b87d7ff).
You can just take a look into NestJS doc for more basics but yeah we will be covering all over the tutorial series. It is a practical guide to understand whole NestJS framework for beginner and intermediate to advanced.
Before anything else we need a starting point and NestJS covered that for us. We can use their CLI tool to create new project. First, we need to install nest CLI as global command. You can use the below command to install and start your own NestJS project.
```bash
npm i -g @nestjs/cli
nest new nestjs-series
```
Now we have a project, just open it up your liked text editor, I am using VS Code. Defining a layout/architecture of project is very crucial part, you can see src folder inside just create this particular folder and file structure that we will be using for entire project.
```bash
src
├── entities
├── main.ts
└── modules
├── app
├── auth
├── config
├── database
├── mail
├── media
└── user
```
Let me describe them one by one, entities will have all the models/entities that will take care of our communication with DB and those will be injected accordingly into services as used for. We will be discussing more on Dependency Injection and services and many more things coming in this series.
What we want to achieve
We want to achieve a boilerplate or small project that will be guided to understand whole NestJS frameworks. NestJS is more like library instead of framework not as framework as it does provide you very much flexibility in terms of everything you wanted to achieve in any way.
So what we want to create is very important to even start any project. Because without what you want to build, doing anything is time taking and dumping things to create a pile of bugs.
Let us start with some API doc, what we wanted to achieve in this series. I will not be able to write e2e test cases as it will be slowing down our series progress.
Here are our APIs’ and there documentation to be made, we can first define the Auth API docs that we can start our work with
1. Register a user
```json
POST /v1/auth/email/register
// body
{
"email": "example@danimai.com",
"password": "Password@123",
"first_name": "Danimai",
"last_name": "Mandal"
}
// response code
201 Created Successfully
```
2. Verify email address
```json
POST /v1/auth/email/verify
// body
{
"verify_token": "vhsbdjsdfsd-dfmsdfjsd-sdfnsdk"
}
// response code
200 Verified Successfully
```
3. Login user
```json
POST /v1/auth/email/login
// body
{
"email": "example@danimai.com",
"password": "Password@123"
}
// response code
200 Logged in Successfully
// response body
{
"auth_token": "vhsbdjsdfsd-dfmsdfjsd-sdfnsdk"
}
```
4. Send verify email
```json
POST /v1/auth/email/send-verify-email
// body
{
"email": "example@danimai.com"
}
// response code
204
Sent Verification mail.
```
5. Request reset password
```json
POST /v1/auth/email/reset-password-request
// body
{
"email": "example@danimai.com"
}
```
6. Reset Password
```json
POST /v1/auth/email/reset-password
// body
{
"password": "Password@123",
"reset_token": "vhsbdjsdfsd-dfmsdfjsd-sdfnsdk"
}
```
7. Log out user
```json
GET /v1/auth/logout // authenticated route
```
Now as we go ahead we need more of brain mapping structure that we wanted to create modules for. I also wanted to explain the structure that we are going to use. So the list of what we require are and what we are going to
1. validation
class-validator and class-transformer those are two libraries we are going to use for validation, so we can just run
```bash
npm i --save class-validator class-transformer
```
2. Swagger doc
We have very cool library from NestJS that handles all our requirement by attaching Swagger decorator in validator classes, and we can just use that as extension not as whole separate setup that requires maintenance. You can run below command to install swagger library by NestJS.
```bash
npm install --save @nestjs/swagger
```
3. SQL ORM (TypeORM)
We are going to use TypeORM as it supports very well with NestJS, but I would suggest Drizzle or Knex Or anything else that are very fast and allow us more control over raw SQL. But you also have to remember TypeORM is not enemy, you don’t have to migrate to any other ORM or library if you don’t face any critical issues. To install TypeORM use the below command. The command includes TypeORM, TypeORM wrapper for NestJS and pg driver for PostgreSQL.
```bash
npm install --save @nestjs/typeorm typeorm pg
```
4. Platform (Express)
Indeed, NestJS is a separate framework, but It uses platform library like express or Fastify to use to run everything. NestJS actually provides its own wrapper to run everything. We will go forward with express.
```bash
npm i @nestjs/platform-express // it should be installed with nest new command
```
Above are basic library we need to proceed Or to just gain more idea what are we dealing with. In the next article, we will set up things with TypeORM and create some commands to run migration. We will go over each of the things mentioned above, So see you in the next.
Code for every article are provided in this [repo](https://github.com/danimai-org/nestjs-series). | depak379mandal |
1,868,104 | How to build an email list fast | Building an email list quickly is a critical strategy for businesses and marketers aiming to reach a... | 0 | 2024-05-28T19:24:47 | https://dev.to/events_galore_a44563c2cba/how-to-build-an-email-list-fast-h73 | Building an email list quickly is a critical strategy for businesses and marketers aiming to reach a larger audience, enhance engagement, and drive sales.
Personally, I use [xaleads.com](https://xaleads.com
) to build my email list and capture leads on my website—it's been a game-changer!
Here’s a comprehensive guide on how to build an email list fast.
**1. Create Compelling Lead Magnets**
A lead magnet is an incentive offered to potential subscribers in exchange for their email addresses. Effective lead magnets include eBooks, checklists, whitepapers, templates, and free trials. To ensure your lead magnet is compelling:
Identify your audience’s pain points: Offer a solution that addresses a specific problem your target audience faces.
Make it valuable: The lead magnet should provide significant value, making it worth the exchange of their email address.
Ensure it's relevant: The content should align with your business and be something your audience would naturally be interested in.
**2. Optimize Your Signup Forms**
The placement and design of your signup forms can significantly impact your conversion rates. Consider the following tips:
Positioning: Place signup forms in prominent locations such as your homepage, blog posts, and landing pages. Pop-up forms, slide-ins, and exit-intent pop-ups can also be effective.
Simplicity: Keep the form short and straightforward. Asking for just the email address is often sufficient, although you might also ask for a first name to personalize your emails.
Clear Call-to-Action (CTA): Use a strong, clear CTA button that tells users exactly what they’ll get by signing up, such as “Get Your Free eBook” or “Subscribe for Exclusive Updates.”
**3. Utilize Social Media**
Social media platforms offer a vast audience that can be directed to your email list signup forms. Here’s how you can leverage social media:
Promote lead magnets: Share posts that highlight the benefits of your lead magnet, directing users to a landing page with a signup form.
Run contests and giveaways: Host contests where entry requires participants to sign up with their email address.
Use social media ads: Platforms like Facebook and Instagram allow you to create targeted ads that direct users to your email signup form.
**4. Leverage Content Marketing**
Content marketing is a powerful tool for attracting and converting visitors into subscribers. Here’s how to maximize it:
Publish valuable content: Regularly post high-quality, relevant content on your blog or website. Include CTAs within your content that encourage readers to subscribe.
Guest blogging: Write guest posts for popular blogs in your industry and include a link back to your signup form.
Content upgrades: Offer additional, exclusive content within your posts that readers can access by subscribing to your email list.
**5. Harness the Power of Webinars**
Webinars are a fantastic way to provide value while growing your email list. Here’s how to use them effectively:
Choose relevant topics: Select topics that address common questions or challenges your audience faces.
Promote your webinar: Use your website, social media, and other marketing channels to promote your webinar.
Collect email addresses: Require attendees to register with their email address to gain access to the webinar.
**6. Collaborate with Influencers and Partners**
Partnering with influencers or businesses in your industry can help you reach a broader audience. Here’s how to do it:
Co-host events: Co-host webinars, live streams, or events with influencers where attendees have to sign up with their email.
Cross-promotions: Work with partners to promote each other’s lead magnets or content to your respective audiences.
Guest appearances: Appear as a guest on podcasts, webinars, or blogs and direct the audience to your signup form.
**7. Use Exit-Intent Popups**
Exit-intent popups appear when a user is about to leave your website, offering a last chance to capture their email. To make exit-intent popups effective:
Offer a compelling reason: Provide a strong incentive, such as a discount, free download, or exclusive content.
Design effectively: Ensure the popup is visually appealing and doesn’t obstruct the user’s ability to leave if they choose to.
**8. Optimize Your Website for Mobile Users**
A significant portion of web traffic comes from mobile devices, so it’s crucial to optimize your email signup process for mobile users:
Responsive design: Ensure your signup forms and popups are mobile-friendly.
Short forms: Keep forms brief to accommodate mobile screens and avoid overwhelming users.
Fast loading times: Optimize your website’s loading speed to prevent potential subscribers from leaving due to slow performance.
**9. Email Signatures and Offline Methods**
Everyday interactions and offline methods can also contribute to building your email list:
Email signatures: Include a link to your signup form in your email signature.
Networking events: Collect email addresses at conferences, trade shows, or other events using sign-up sheets or business card collections.
Physical stores: If you have a physical store, collect emails at the point of sale or through in-store promotions.
**10. Analyze and Improve**
Regularly analyzing the performance of your email list building strategies is crucial for continuous improvement:
Track metrics: Monitor conversion rates, traffic sources, and the performance of different lead magnets and forms.
A/B testing: Conduct A/B tests on your signup forms, CTAs, and lead magnets to determine what works best.
Adjust strategies: Based on your analysis, make data-driven adjustments to optimize your approach.
Building an email list quickly requires a strategic combination of valuable incentives, effective marketing techniques, and continuous optimization. By implementing these methods, you can grow your email list, enhance your marketing efforts, and drive your business towards greater success. Remember, the quality of your subscribers is just as important as the quantity, so always aim to attract engaged and interested individuals.
| events_galore_a44563c2cba | |
1,868,043 | Using React Router v6 with Client-Side Routing | The differences between Router v5 (version 5) and v6 (version 6) are many. In this blog post, I'll be... | 0 | 2024-05-28T19:23:01 | https://dev.to/tessmueske/using-react-router-v6-with-client-side-routing-5dnk | react, womenintech, router, clientsiderouting | The differences between Router v5 (version 5) and v6 (version 6) are many. In this blog post, I'll be covering what client-side routing is, and how to use React Router to your benefit when working with this type of routing.
**Client-side routing** is a mechanism through which a user interacts with a webpage. It doesn't require any refreshes or reloads to print new data onto the page; it doesn't require any new GET requests to the server. All of the routing is done with JavaScript. This means: the client's side of the server does ALL of the routing, fetching, and rendering of the information on the DOM for the client to see. The URL should reflect what the user wants to see (ie twitter.com/home, twitter.com/user), which is more intuitive.
Additionally, it's faster overall, which the user always appreciates (not initially, as more must be loaded right off the bat)!
**React Router** is a client-side router (there are others, such as [Hash Router](https://reactrouter.com/en/main/router-components/hash-router), [TanStack](https://tanstack.com/), or [Hook Router](https://www.npmjs.com/package/hookrouter). React Router allows certain components to be displayed based on which URL is called (ie twitter.com/home will render the Home component, twitter.com/user will render the User component).
**When naming your endpoints,** it is helpful to use the 7 RESTful Routes:
[Image source](https://medium.com/@shubhangirajagrawal/the-7-restful-routes-a8e84201f206)
Do you want a user to be able to create something new on the page? View other items on the page? Those questions are helpful to ask yourself when naming your URL endpoints.
```
const routes = [
{
path: "/",
element: <App />,
errorElement: <ErrorPage />,
children: [
{
path: "/home",
element: <Home />
},
{
path: "/about",
element: <About />
},
//and so on
```
^ Your routes variable should be stored in routes.js, with each component imported at the top of the file. Each route is an object, and 'routes' is an array of these objects. "path: "/home"" means that your URL will read yoururl.com/Home. Makes sense! You can also render more than one element on a specific path as well.
This example renders App as the parent component, and Home and About as its nested children. App will act as a mechanism through which info is passed down to all its children; anything rendered in App will render in its children as well. The ErrorPage component will render to any of its children that run into an error, letting the user know that something went wrong.
Import your routes into your index.js file:
```
import React from "react";
import ReactDOM from "react-dom/client";
import { createBrowserRouter, RouterProvider } from "react-router-dom";
import routes from "./routes.js";
import "./index.css"
const router = createBrowserRouter(routes);
const root = ReactDOM.createRoot(document.getElementById("root"));
root.render(<RouterProvider router={router} />);
```
This links your file with the routes listed to your index.js.
_createBrowserRouter_ takes the routes array imported from routes.js and creates the router that your website will use for navigation; _RouterProvider_ is the component that takes the prop of 'router' and defines it using the routes in the routes.js file. It will then be available throughout your entire application.
It took me some time to understand this, especially because there are so many resources for the syntax of v5 versus v6! Take your time - you've got this! xo
_Additional note: To pass props from App to children components, you can use [useOutletContext](https://reactrouter.com/en/main/hooks/use-outlet-context). Here are two additional resources about useOutletContext: [1](https://medium.com/@bobjunior542/react-router-6-advanced-routing-with-useoutlet-and-useoutletcontext-2cfca328b7ac) and [2](https://phantodev.hashnode.dev/using-useoutletcontext-hook-reactjs). This allows you, the developer, to pass props from parent to child while simultaneously using Router (since you aren't explicitly rendering the children components in your parent component anymore, enabling the passing of props)._ | tessmueske |
1,867,878 | App development lifecycle explained: Step By Step Guide | If you've ever used a fantastic app, you've undoubtedly thought about the development process and how... | 0 | 2024-05-28T19:21:28 | https://dev.to/asadbashir/app-development-lifecycle-explained-step-by-step-guide-2l5g | If you've ever used a fantastic app, you've undoubtedly thought about the development process and how someone's creative idea turned into a finished product. Apps have evolved from being upscale instruments for tech-focused industries to becoming essential for all businesses, regardless of whether they have a significant internet presence or not. They improve marketing techniques, fortify corporate processes, and boost client retention.
The processes involved in developing an application are frequently influenced by a number of variables, such as the project's size, the developer's level of experience, the specificity of the requirements, potential changes to the app, and the deadline. Although there isn't a single best way to create applications, development teams usually follow standard steps to create a cycle of application development.
An organized approach that helps you anticipate what to expect, manage expectations for the development team, and reduce errors is known as an efficient app development methodology. It assists businesses in planning ahead, developing excellent apps on a budget, and continuously optimizing them.
Our comprehensive application development life cycle will give you some fundamental guidelines and get you started if your goal is to create a successful app that satisfies users' constantly evolving needs.
## What is the life cycle of an application development?
The well-organized series of processes that outline app planning, construction, testing, deployment, and maintenance is known as the application development lifecycle. As a development methodology, it aids developers in producing high-quality apps by enabling them to finish the stages of application development efficiently, cheaply, and quickly.
The processes involved in developing an application can change based on your type of business, your clients, the latest trends in application development, and the requirements of your particular app. It guarantees apps satisfy expectations and create a superior experience that surpasses user demands, given their constantly evolving requirements.
## Why is the life cycle of application development important?
The application development lifecycle has the following benefits:
It offers details on the ins and outs of developing applications, assisting companies in estimating development times and guaranteeing that all needs are precise, reasonable, and fulfilled by deadlines.
The stages involved in application development provide team leaders with a more comprehensive understanding of the process, which enhances project planning and scheduling.
The application development cycle streamlines project monitoring and management, enabling businesses to plan app releases and maintain satisfied internal or external customers.
The standardized development framework promotes visibility to all stakeholders participating in the project by defining activities and deliverables on all elements of the life cycle.
The project expenses and hazards connected with using alternative production methods are reduced when the development cycle is followed.
Project schedule estimation helps avoid common problems in app development projects and could hasten development.
The lifespan of application development described
The six steps in the app development lifecycle are listed below.
- Phase of ideation or discovery
- Phase of planning
- Phase of design
- Phase of development
- Testing and quality control
- Implementation and upkeep
### 1. Phase of ideation or discovery
In order to find feasible ideas or pressing issues, app developers seek feedback from all relevant parties, such as customers, developers, industry experts, and salesmen. Developers may design a product that satisfies customer expectations by using their core understanding of the product to translate information into a clear statement of the app requirements.
Customers or business teams frequently have a vision for the product, a goal, or business requirements. Even though most people believe they know exactly how their apps should look when they're finished, only developers can assist them clarify and polish their concepts.
The ideation stage determines the goals of the product, what needs to be produced, and who the ultimate user is. It include laying out the features, outlining the technical specifications for the app, investigating rivals, and translating technical material from human language.
### 2. The stage of planning
The requirements-gathering stage, sometimes referred to as the planning stage, entails analyzing end-user needs and then precisely aligning them with user expectations. needs are categorized based on user, business, and critical system needs, ranging from high-level to comprehensive.
Planning for app development also involves defining and recording needs such as data backup frequency, performance goals, fault analysis and prevention, failure prevention, app usability, portability, accessibility, security, and recoverability. The app's viability is determined using an incremental development strategy that offers the team flexibility.
Additionally, planning entails:
- laying down the parameters and project scope in detail.
- Carrying out cost and project estimation.
- effective workforce size.
- Project completion dates.
- calculating the requirements for purchases.
Companies also assign resources, establish capacity, set project timeframes, recognize hazards, and then provide mitigation strategies.
### 3. Phase of design
The design stage gets the app concept ready by creating a sketch of the future application and transforming the app specs into a design that highlights the distinct feel and style of the app. Programming experience might not be necessary, particularly if you employ low-code or no-code platforms to create apps.
The user interface, particular security measures, app development platforms, app architecture, and the way the app interacts with other systems are all included in app design. A design prototype gives a general concept of the appearance and functionality of the program.
In order to build a strong prototype with a well-planned user flow, feedback and comments from potential users, company executives, and developers help identify any iterations needed to improve the app. Failure during the design phase can lead to project collapse and expense overruns.
### 4. Phase of development
App developers use the app development technology stack that is specified at the start of the project to construct their apps according to project requirements once they have a complete understanding of the product needs. One individual can build the complete app, or a large team can work on different parts of it, depending on the complexity of the app and the development approach your organization chooses.
Low-code app development platforms enable you to write unique programs or applications in a coding language tailored to the needs of the app. When coding is required, IT developers collaborate with designers, project managers, and quality assurance engineers while adhering to development principles and the design blueprint to produce a Minimum Viable Product.
Prioritizing tasks and estimating their estimated completion times aid developers in project estimation and assist them foresee problems that could arise during the application development process and cause production delays. Even though they frequently run into problems like flaws in the code, they figure out the best ways to run the code, check it over, and make changes to create stronger, more error-free code.
### 5. Testing and quality control
Apps should be tested frequently to make sure all of the parts function as intended and communicate with one another effectively. Once the program has been developed on LCNC platforms or the coding is finished, the procedure begins. It identifies flaws, shortfalls, and hazards before making the necessary corrections. Only once every verified flaw has been fixed is a new version of the application released.
Testing ensures that programs adhere to the original, specified requirements and keeps companies from publishing subpar apps. Apps that need development are tested to ensure code dependability and reduce the number of defects customers experience, which boosts utilization and improves user happiness.
Extensive, automated testing also detects any last errors and assesses how well the software complies with user requirements in actual use cases. The likelihood of an app failing after it is released is decreased by higher-level testing and quality assurance, which includes integration, performance, security, and system testing.
### 6. Implementation and upkeep
The application development cycle reduces the time between app creation and deployment and streamlines operations. Your application will operate at its best with regular maintenance and updates. Deployment can be either automatic or manual, depending on the needs and complexity of the application.
Developers specify a deployment strategy in a test-driven development environment that includes several quality checks prior to the app being automatically deployed to the end user. After the program is released, maintenance makes sure that bugs are fixed and that the code is improved over time.
Users give developers insightful feedback while they use the app, which helps them enhance features and increase user satisfaction and retention. Updating and maintaining apps also changes them to conform to the dynamic company needs and market situations.
Decide on the life cycle of your application development.
Software application development is an ongoing process that doesn't end with deployment. Regardless of how much testing or stability an app has had, there will always be unanticipated problems that could leave customers dissatisfied. Using the same set of tools throughout the application development life cycle gives your team a shared language that makes finding and fixing bugs easier.
Although each business has its own procedure for developing applications, there are some little differences in the stages involved. They support companies in establishing appropriate objectives and adhering to best practices in development so they can monitor project progress, keep tabs on results, and react fast to adjustments.
Application requirements, project size, application production costs, organization size, needs, system complexity, and talent limitations all influence the different application development approaches.
However, because teams employ best practices and methodologies to create, deploy, maintain, and upgrade apps, adhering to a proper cycle facilitates development and helps projects be completed successfully.
Techxpert provides the facility for app development. For more information, visit [techxpert.io](https://techxpert.io/).
| asadbashir | |
1,867,885 | App development benefits for ecommerce guide | Mobile apps are now a key element of any online business strategy. The availability of a mobile app... | 0 | 2024-05-28T19:21:24 | https://dev.to/asadbashir/app-development-benefits-for-ecommerce-guide-13fl | Mobile apps are now a key element of any online business strategy. The availability of a mobile app for an eCommerce site has become one of the biggest factors in influencing an online customer to visit and complete their purchases on a brand’s website. There are countless benefits of having a mobile app presence for your company, which include better customer engagement, easy access, seven-day-a-week service, and much more.
## Improved Customer Targeting Capabilities
E-commerce mobile applications are built with the aim of helping businesses grow and prosper. They play a major role in engaging customers by providing relevant offers, information, and content. This in turn helps businesses target their customers more effectively with text messaging, video or push notifications for example. This helps in higher conversions just as much as it does in creating a more user-friendly experience that your customers can enjoy.
## Turn First-time Buyers into Repeat Customers
Yes, an app can boost your brand presence — and this is no longer a speculation. Mobile marketing has been used by many to boost reach and drive engagement. The usage of mobile apps, on the other hand, allows more powerful interactions than the conventional mobile website with all its speed and fluidity problems. Moreover, apps come with more privacy and security measures for better protection.
## Hassle-free Shopping Experience
A mobile-friendly shopping application helps to increase your digital sales conversion rates. Many customers find it challenging to navigate their way around a website when purchasing from a mobile device. A good online store needs to have an easy-to-use mobile application to make the shopping experience better.
### In-depth Customer Insights:
eCommerce apps collect a large amount of data about shopping habits, item searches, and browsing patterns. You can then use this data to improve your marketing strategies, focus product development, and enhance user experience. Improve your business with the right information from the app. The data collected includes demographics (age, gender), socio-economic details (income), and location-specific features (zip codes, search trends).
### Continuous Optimization:
Customer data is more than a marketing tool. It is one of the cornerstones of a modern business. Modern companies tend to attract customers who are willing to buy the products and services they offer. The opposite is also true: when you have a strong customer base, your company can grow exponentially. However, there is a subtle difference between growth and development — you can only achieve the latter if you understand your target audience better (along with its desires, needs, preferences…). This means logging their behavior and engagement with your app or website and using insights obtained from this to improve your business.
### Omni Channel Experience:
As an online merchant, you are constantly focused on increasing your revenue and bringing new or loyal visitors to your website. The problem is that consumer behaviors are changing rapidly. Your customers may be using multiple devices to shop online. Therefore, they’ll expect a seamless shopping experience across their devices as well.
### Increased Accessibility:
In today’s consumer-driven society, consumers are demanding more than ever before. Customers are always on the move — whether they’re on a train, in an airport or simply walking to work. With this rise in mobility and a simultaneous increase in the number of smartphones and mobile phones, shopping can be done whenever and wherever including online. This means you need to adapt your business for an increasingly mobile audience by expanding your delivery systems to multiple channels. If you don’t take advantage of this opportunity, there’s no telling what your losses will be!
### Competitive Advantage:
Possessing a mobile e-commerce app provides you with a competitive edge, signaling your commitment to align with customers’ preferred online shopping methods. This differentiation from competitors can draw in new customers seeking a more convenient shopping experience.
### Improved Customer Loyalty:
E-commerce is growing rapidly, and mobile apps are becoming increasingly important for companies that want to develop customer loyalty through personalized shopping experiences. Using data collected from shoppers who download your app allows you to deliver customized offers and product recommendations. This increased value can lead to repeat purchases and customer satisfaction.
### Cost-effective Marketing:
Apps can be a source of growth for your business. There are many benefits to having an app, including increasing customer engagement and user loyalty, especially if they’re loyal to the app itself and not reliant on any one product in the app. With push notifications, you can alert customers to new products, sales, and special promotions without the need for expensive advertising campaigns. This can help increase customer engagement and ultimately lead to increased sales.
## Conclusion
An e-commerce website is a great start to establish your business online. But just having an online store won’t help you get additional customers in the door. The idea is to make your website more mobile-friendly so that it integrates with other marketing strategies and helps drive more traffic. There are a few things you can do to maximize the use of mobile phones with your e-commerce strategy. With a mobile app, you can easily help clients find what they’re looking for — whether it’s through mobile or desktop views — and increase conversions while staying true to your brand.
Brain Inventory is a revolutionary E-commerce app development company that specializes in applying advanced technologies and creating apps in the most efficient ways. Our company understands how your customers engage with you. We listen carefully to your needs and deliver customized applications.
Techxpert provides the facility for app development. For more information, visit [techxpert.io](https://techxpert.io/).
| asadbashir | |
1,867,886 | Full Stack Software Development Explained with components | The term "full stack development" describes the front end and back end of an application's software... | 0 | 2024-05-28T19:21:22 | https://dev.to/asadbashir/full-stack-software-development-explained-with-components-3lk4 |
The term "full stack development" describes the front end and back end of an application's software development process from start to finish. The user interface is part of the front end, while application workflows and business logic are handled by the back end.
Front-end, back-end, and database development are the three primary parts of a complete stack development.
Think about an online store. In addition to many additional options, users can explore or buy particular items, remove or add items to their carts, modify their profiles, and much more. A front-end user interface (UI) and some back-end business logic are needed for each of these operations.
Front-end technologies such as HTML, CSS, and Javascript can be used to build the user interface (UI) of a website.
Python and Java are two of the programming languages used to write the back end. Additionally, a solid online application would require event handling, routing, and scalability—tasks typically performed by frameworks and tools like Django or SpringBoot.
Moreover, the back end comprises logic for establishing connections between the application and databases and other services. For instance, through particular back-end drivers, all user and transaction data is kept in a database.
A front-end and back-end workflow implementer who can handle both tasks independently, such as making an order or updating a user's profile, is known as a full stack developer.
## What is the role of a full stack developer?
An entire technology stack, or the collection of technologies needed to swiftly and effectively create an end-to-end application, must be understood by full stack developers. For instance, they need be familiar with working with MongoDB, Express, Angular, and Node if they wish to develop an application utilizing the MEAN stack.
Early on in a project, full stack developers should be able to determine whether the chosen technologies are the best fit for the project. Among the duties of a full stack developer are the following:
assist in selecting the appropriate technology for the development and testing of the project from the front end to the back end.
By adhering to the recommended practices of the tools being used, write clean code throughout the stack.
To ensure that you are using technology wisely, stay current on the newest tools and technologies.
## Which languages are utilized by full stack developers?
Any combination of languages that perform well with the overall application framework and each other can be used by full stack developers. Being one of the few languages that can be used on the front end as well as the back end, JavaScript is widely employed by full-stack developers. For smaller or medium-sized projects, businesses will probably engage a full stack developer. Among the languages that are widely spoken are:
**Front end**: JavaScript, CSS, and HTML.
**Back end**: PHP, Node.js, R, Java, Python, and Ruby.
Using whole technological stacks, such as MEAN, MERN, Ruby on Rails, and LAMP, is also a common and practical technique for quicker and more effective development as well as a simpler learning curve.
## Full stack versus back end versus front end
Applications requiring more intricate operations and higher scalability necessitate teamwork and a wider range of skills. For instance, one team may be in charge of the back end and the UI team of the front end. It may be necessary for people to work on both the front-end and back-end implementation of a feature in some organizations. Full stack developers would be useful in this situation.
## Developers for the front end
These developers take care of a website's (or web application's) user interface (UI), which includes forms, frames, visual effects, and navigation. They use HTML, CSS, and JavaScript as their primary programming languages and are primarily user experience focused.
## Developers for the back end
They address the application's business logic, security, scalability, performance, and request-response management. They employ.NET, JavaScript, Python, and Java to construct the main application workflows, or they create their own frameworks.
## Complete stack programmers
They are in charge of employing both front-end and back-end technology to code entire workflows. Full stack developers can create end-to-end apps using JavaScript-based technological stacks like the MERN and MEAN stacks.
## Benefits of full stack development
Hiring full stack developers has several benefits when developing online applications, including:
- total commitment to and comprehension of the project
- increases productivity and reduces project time and expense
- Quicker bug fixes because of comprehensive system knowledge
- Simple knowledge sharing with fellow team members
- Improved task distribution among team members
## In summary
Building web apps with full stack development is quicker and more effective since team members have access to a wide range of tools and technologies, which they may utilize for both current and future research. The basic database of the two most well-known technology stacks, the MEAN stack and the MERN stack, is MongoDB, which has a flexible schema and offers scalability and high availability for projects of any size.
Techxpert provides the facility for app development. For more information, visit [techxpert.io](https://techxpert.io/).
| asadbashir | |
1,867,891 | Software Development Project Management Benefits | It is hardly unexpected that more and more businesses are implementing project management software... | 0 | 2024-05-28T19:21:19 | https://dev.to/asadbashir/software-development-project-management-benefits-2kbg | It is hardly unexpected that more and more businesses are implementing project management software given its growing popularity.
It facilitates a project's organization, accountability, and visibility.
## However, what are the long-term benefits for an organization?
An increasing number of businesses are interested in learning how it impacts their organization's expansion.
We do have an easy-to-read list of benefits that you can review if you are faced with a similar situation.
There is more to project management than just organization. It arranges the tasks so as to facilitate efficient completion.
This is the solution if you and your team are experiencing a state of flux.
Are you still unsure about the benefits of project management software?
We've provided you with a selection of a few.
Try Project Central if you're looking for a good project management tool. Based on Microsoft Azure, Project Central can be integrated with your preferred Microsoft 365 applications, such as Teams and SharePoint Online.
### 1. A centralized methodology
The fact that a project management application keeps everything consolidated is just one of its many benefits.
Having everything on one platform makes project management simpler.
It also encourages real-time tracking and aids in monitoring project collaboration.
Not only that, but it also facilitates the notification of other team members.
Additionally, it enables you to overcome any challenge that comes your way without difficulty.
Most software solutions include all the capabilities needed for improved project management into one package.
### 2. Aids in setting specific objectives
Setting up definite objectives is simple when you use project management software.
This is one of the most important phases in establishing a project's goals and objectives.
It's likely that you won't have a roadmap if you don't know what your ultimate objective is.
Setting and reaching objectives and benchmarks is made simpler with the help of this kind of management software.
This aids in increasing project transparency and encourages greater growth.
It facilitates task delegation and even lets you establish priorities based on the same.
This guarantees that the projects are finished on schedule and within the allocated budget.
### 3. Monitor advancement
The ability to track progress is one of the most popular and reliable benefits of project management solutions.
It's critical to monitor the project's development at every turn.
This aids in risk identification and even averts any possible crises.
Having software to guide you is helpful when you are juggling several projects.
It should go without saying that consolidated data storage facilitates simpler problem tracking.
### 4. Recognize hazards
There are dangers associated with any project.
Needless to say, you will run into one or the other.
Project management has the benefit of assisting with early detection.
Effectively managing risk is made simpler when it can be recognized early on.
Resolving all issues at the last minute is the last thing you want to happen.
Early problem solving not only helps to avoid more issues down the road, but it also improves project execution.
### 5. Evaluate the situation
Real-time web-based project management will ensure that you experience a fair amount of reality.
The days of expecting what you want are long gone.
Projects involve risks and modifications.
You will experience setbacks, rejection, and financial difficulties.
You can overcome obstacles much more easily if your platform is aligned.
It offers accurate real-time information, which are essential for effective progress management.
It also gives you access to your coworkers' workflow insights.
### 6. Setting better priorities
The ability of project management software to encourage improved prioritization is yet another fantastic advantage.
You will be able to search for the project's weaknesses with this.
Additionally, it aids in project management.
It guarantees that you can give teammates updates in real time.
With these platforms, you may quickly prioritize projects as necessary.
You don't have to bother telling them all of the information.
It would be possible to educate everyone with a single, consolidated message, which is an incredible alternative.
### 7. Improved cooperation
Software for project management facilitates improved teamwork.
If you're wondering how and why, the key reason is improved communication.
Having a centralized communication platform makes it simple to monitor the status.
Sharing documents also becomes much more efficient.
All things considered, effective communication facilitates easy team collaboration.
These software programs fill in the blanks, encouraging improved project management and team formation.
Techxpert provides the facility for Software development. For more information, visit [techxpert.io](https://techxpert.io/). | asadbashir | |
1,867,893 | Software Development for Restaurants: Guide | In order to build client loyalty and repeat business, restaurants face an unparalleled requirement to... | 0 | 2024-05-28T19:21:16 | https://dev.to/asadbashir/software-development-for-restaurants-guide-3igp | In order to build client loyalty and repeat business, restaurants face an unparalleled requirement to constantly innovate and engage with their consumer base. Using mobile applications is one tactic that has been gaining more and more attention lately. These software programs give customers a productive, easy-to-use interface via which they can browse menus, place orders, and even accrue loyalty points. Traditional approaches find it difficult to match the degree of convenience and accessibility provided by this technology.
Think With Google's most recent research emphasizes how crucial having a strong internet presence is. A staggering 89% of consumers currently use their smartphones to research restaurants, highlighting the critical role that digital presence plays for companies. Moreover, it also shows that most people browse menus on their mobile devices before deciding where to eat, highlighting the necessity for software that is easy to use and intuitive that compiles all the important information in one handy place.
Specifically, the rise of smartphone ordering has fundamentally changed the restaurant business. These days, restaurants' websites handle more than half of all takeaway and delivery orders, which emphasizes how important successful software design is. Restaurant software development offers a digital storefront that allows patrons to easily peruse menus, make orders, and follow delivery in real time. This enables dining venues to provide the hassle-free, seamless experiences that contemporary customers need.
It's important to understand that, despite its intimidating appearance, the restaurant software development process may be successfully managed by following a ten-step plan.
## THE PROCESS OF RESTAURANT SOFTWARE DEVELOPMENT
An organized development approach is essential to guaranteeing that the software fully aligns with the needs of both the restaurant and its patrons. Let's go over the critical processes that must be carefully followed in order to create a successful software solution for restaurants.
### Step 1: Clearly State Your Goals
Every time we create restaurant software, our team starts by working with the client to identify the goals and purposes of the software. There are several solutions available in the restaurant software space, and each one fulfills a different function and tackles a different set of difficulties. Software for ordering, delivering, processing payments, and managing restaurants are a few examples.
What particular results are you hoping the software will achieve? Is your goal to increase revenue, improve client interaction, or improve the eating experience as a whole? Your aims' clarity will act as a compass to help you choose the features and functionalities your software solution needs.
### Step 2: Examine Your Rivals
Investigate your rivals in-depth to determine their advantages and disadvantages. What unique qualities do they offer that you can hone and enhance? What are the most common grievances consumers have about their software? Make use of this insightful information to develop your software's USP.
You can determine which features of your competitors' software might not fully satisfy market demands by looking at the competitive environment. It gives you the ability to integrate features that aren't already accessible and more effectively handle frequent consumer complaints. Remember that great software development is more than just brainstorming; it requires understanding your target market and providing them with a solution that goes above and beyond what they anticipate. As a result, this stage is essential to the development of restaurant software.
### Step 3: Choose the Best Platform
Choose the platform (iOS, android, or both) that you want to use for developing restaurant software. Consider the following aspects when choosing a platform to make sure your software produces the best possible results:
Alignment of Target Audience: Acknowledge that the two operating systems serve different user demographics. The target user base of the selected platform must coincide with the intended audience of your app. For instance, considering iOS development's larger user base in that age range, it could be wise to concentrate on it if your software is intended for a younger audience. On the other hand, because of its reputation for flexibility and customization, you should consider Android development if your product caters to business professionals.
Feature Compatibility: Evaluate the distinctive features and functions that you would like to include in your program. Because iOS and Android each have different characteristics, it's critical to choose the platform that best supports the features that are critical to the success of your app.
Resource Allocation: When developing restaurant software on each platform, take into account the financial and resource implications. You may reach a wider audience by developing software for both iOS and Android, but doing so might also require more money and effort.
Every platform has a unique set of benefits and cons. Therefore, when developing restaurant software, it is crucial to select the one or both that best fit the requirements and goals of your business.
### Choose Your Features in Step Four
Decide which particular features you want to add to your app. Basic functions include ordering capabilities, reward programs, reservation administration, and menu presentation. Additionally, think about incorporating cutting-edge features like sophisticated analytics, social media connectivity, and push notifications.
The kind of software, its overall goals, and the specific problem it aims to solve should all be taken into consideration while choosing features.
### Step 5: Create the Software Design for Your Restaurant
It's now time to design your restaurant software's user interface (UI) and user experience (UX).
It is essential to carefully consider the software's overall visual design when creating the user interface. The UI should be visually appealing and cohesive with the style of your business. Make sure the font, color palette, and other design elements you choose are in harmony with the visual identity of your brand.
In the field of user experience, it is critical to prioritize ease of use and clear navigation. Users should be able to easily understand how to utilize your design and be guided through all of its features. When designing software, take into account the user's path and aim for a seamless, logical experience. This could mean carrying out user research, trying out various design ideas, and refining the design iteratively until the best user-centric solution is found.
You may build software usage and brand loyalty by creating a UI/UX design that improves the user experience. This will ultimately help your product succeed as a whole.
### Create Your Restaurant Software in Step Six
The foundation of your software solution is formed by this step. The ideation, testing, and implementation of the software's features are all included in the restaurant software development process. Your software becomes functional through the skill of coding, providing a flawless and remarkable user experience.
Additionally, coding provides the freedom to modify the software to precisely match the restaurant's requirements. For example, it can be designed to improve overall simplicity by streamlining the online ordering and payment procedures.
Coding also makes it easier to integrate with other systems—like inventory management—which improves the operational effectiveness of the business.
### Step 7: Check the Software for Your Restaurant
Once the coding of your product is finished, thorough testing becomes an essential step. This guarantees that the program operates without a hitch across a variety of platforms and devices, detecting and fixing any flaws, malfunctions, or problems that might occur during real-world use. It is also crucial to evaluate the software's user experience to ensure that it is easy to use and has straightforward navigation.
Techxpert provides the facility for software development. For more information, visit [techxpert.io](https://techxpert.io/).
| asadbashir | |
1,867,903 | Benefits of Using Custom Software Development | The process of developing specialized computer programs that are precisely suited to a person or... | 0 | 2024-05-28T19:21:13 | https://dev.to/asadbashir/benefits-of-using-custom-software-development-1g84 |
The process of developing specialized computer programs that are precisely suited to a person or business's needs is known as custom software development. It entails taking the concepts and specifications of a client and turning them into a software program that precisely satisfies their needs.
Unlike off-the-shelf products, this kind of agile software development is created from the bottom up to precisely match the needs of the client. Custom software development is becoming more and more popular as a way for businesses to offer distinctive solutions that more generic software cannot.
## What Sets It Apart From Software Off-The-Shelf?
Software that is readily packaged, ready-to-use, and sold to the general public is known as off-the-shelf software. With a common preset foundation and design, it is made for a wide range of users rather than responding to the demands of specific users.
You may easily connect the software with your current system thanks to the way it is made. Since a wide range of audiences are taken into consideration during the creation process, personalization is not always necessary.
As we've already discussed, custom software development is the process of creating, implementing, and managing software to satisfy the unique needs of a single user or a group of users inside an organization.
Usually, it is built internally by developers or contracted out to a different company. The main goal of this kind of software is to cater to the particular requirements of companies. Typically, it is constructed for internal use only, not for market resale.
## What Kind of Software Is Customized?
The following examples show how customized software can meet the particular demands and specifications of different niche markets while offering customers more value and specialized functionality.
Software for Managing Medical Practices: Managing several software programs for billing, practice administration, and electronic health records can be difficult for independent medical clinics. Kareo saw this need and created a cloud-based, all-in-one solution tailored to these procedures. The needs of small, independent medical practices were met by this custom software, which expedited procedures and removed the need to handle several instruments. A number of features are available from Kareo, which is now a Tebra company. These include practice management, electronic health records (EHR), billing, and patient interaction capabilities.
Agricultural Management Software: In the past, the primary focus of agricultural management software was accounting and fundamental farm management. Granular identified a need in the market for an operationally optimizing data-driven farm management technology. Granular was able to meet these unmet demands and give farmers a more complete tool to increase their output by developing a unique software solution. Granular assists farmers in optimizing their operations through data-driven decision-making. With the help of tools like inventory tracking, crop planning, and financial management, farmers can effectively manage their resources.
### Software for Museum Management:
To oversee their distinctive collections and displays, museums frequently need specialist software. There is a void in the market since many off-the-shelf solutions were not created with museum administration in mind. Seeing this need, PastPerfect created a specially designed software program for museums, making the categorization and administration of priceless collections much easier. PastPerfect helps museums manage, track, and catalog their loans, displays, and collections. It ensures that the museum's priceless artifacts are appropriately maintained and conserved while also streamlining documentation.
### Pharmaceutical Supply Chain Management:
An Overview Pharmaceutical supply chains are extremely complicated and regulated, and many of the supply chain management systems now in use are unable to meet certain needs. To close this gap, TraceLink developed a proprietary software system with an emphasis on product quality, regulatory compliance, and traceability for the pharmaceutical sector. TraceLink assists businesses in maintaining product quality and safety, tracking and tracing products across the supply chain, and assuring regulatory compliance.
### Custom E-learning Platform:
Although there are a lot of off-the-shelf LMS solutions available in the e-learning industry, they frequently lack flexibility and customisation for particular business needs. Docebo recognized a chance to develop a personalized e-learning platform that would meet each organization's specific needs and allow for more efficient and interesting learning opportunities. For the purpose of creating interesting and productive learning environments, Docebo offers customized training programs, content management, and assessment tools.
### Software for Film Production Management:
Using standard project management tools to handle the numerous intricate procedures involved in film production can be challenging. After spotting this need, StudioBinder created a unique software program intended for managing the pre-production and production phases of the filmmaking process, saving filmmakers time and effort. Filmmakers can more easily organize their projects with StudioBinder's tools for call sheets, shooting schedules, crew and cast management, and screenplay breakdowns.
### Software for Environmental Monitoring:
Conventional software for environmental monitoring frequently addresses only a few facets of environmental management, leaving room for a more all-encompassing approach. To meet this demand, Envirosuite developed a unique software platform that offers real-time analytics, alerting, and forecasting capabilities to assist businesses in making defensible decisions and reducing environmental risks. Organizations may monitor and manage weather data, noise, vibration, and air and water quality with the aid of Envirosuite. It offers tools for forecasting, alerting, and real-time analytics to help make educated decisions and reduce environmental hazards.
Yoga Fitness and Wellness App - Although there are many apps in the health and wellness space, many of them provide generic or one-size-fits-all material. Glo recognized a chance to develop a unique yoga and meditation app that offered individualized advice and specially designed courses, giving customers a more productive and entertaining wellness experience. Glo offers tailored advice depending on the objectives, passions, and past experiences of the user, resulting in a fun and useful wellness experience.
Techxpert provides the facility for software development. For more information, visit [techxpert.io](https://techxpert.io/). | asadbashir | |
1,867,905 | Trends in custom software development for 2024 | The general software development approaches set to define the IT industry in 2024 encompass further... | 0 | 2024-05-28T19:21:10 | https://dev.to/asadbashir/trends-in-custom-software-development-for-2024-dfn | The general software development approaches set to define the IT industry in 2024 encompass further integration of AI and ML technologies, utilization of blockchain, and multi-runtime microservices. Expanded application of AR and VR will also continue to shape the industry. Additionally, programmers will put a greater emphasis on cybersecurity and sustainable software development. We explore each of these trends in detail in this section.
Artificial intelligence and machine learning integration
AI and machine learning are not buzzwords anymore; they’re integral components of modern software development, setting new standards for functionality and performance. From predictive algorithms to automated code reviews, AI/ML technologies are enhancing efficiency and capabilities across various industries.
Developers are using AI-powered coding tools more and more. This not only speeds up the coding process but also helps reduce human errors. For instance, GitHub’s Copilot uses AI to suggest code snippets and entire functions to developers in real-time. Similarly, AI-driven analytics tools like Tableau are enabling businesses to gain insights from their data more efficiently than ever.
Undoubtedly, 2024 will be a year of further development and integration of these technologies, particularly in automating text, coding, and visualization tasks.
## Blockchain beyond cryptocurrencies
Blockchain is finding its footing beyond cryptocurrencies. The surge in mobile applications prioritizing enhanced security and superior quality has led to an increased adoption of blockchain-based apps.
The essential characteristics of Blockchain-Oriented Software (BOS) systems include:
### Data replication:
Data is duplicated and stored across thousands of systems, significantly bolstering data security.
### Requirement verification:
Before proceeding with any transaction, BOS systems check the transaction requirements to ensure they meet the criteria for successful validation.
### Sequential transaction logging:
BOS records transactions in a chronologically arranged log consisting of interconnected blocks set up through a consensus algorithm.
Public-key cryptography: The transaction process in BOS is based on public-key cryptography, ensuring secure and verifiable transactions.
However, blockchain has its limitations as well: scalability and energy consumption remain hurdles to its broader adoption.
## Take a look at the collection of our posts on blockchain.
### Multi-runtime microservices
Microservices architecture is a method of developing software applications as a suite of small, independently deployable, and modular services, each running in its own process and communicating with lightweight mechanisms, often an HTTP-based API.
In 2024, microservices architecture is expected to continue its growth, gradually evolving into multi-runtime microservices. This is also known as MACH architecture, a term created from the first letters of Microservices-based, API-first, Cloud-native, and Headless. MACH architecture allows different services to be written in various programming languages, to use different data storage technologies, and to be deployed on different runtime environments. This diversity in runtimes caters to the specific needs and characteristics of each service, enabling a more tailored and optimized approach for each component of the application.
The primary advantage of a multi-runtime microservices architecture is its ability to leverage the strengths of various technologies and platforms. For instance, a service that requires high computational power can be deployed on a runtime environment specifically designed for such tasks, while another service that deals with real-time data processing can utilize a different environment optimized for speed and low latency. This approach not only ensures that each service operates in its ideal environment but also facilitates easier updates and maintenance, as changes to one service do not necessarily impact others.
Additionally, multi-runtime microservices support a more agile development process, allowing teams to work on different services simultaneously without dependencies.
## Cybersecurity at the forefront of 2024
The increasing sophistication of cyber threats has made security a critical aspect of software development for 2024. Integrating advanced security protocols and utilizing AI for threat detection are becoming standard practices. The focus is shifting from reactive to proactive security measures:
### Emphasis on DevSecOps:
Companies are integrating security into their DevOps processes, creating a culture where security is a shared responsibility among all stakeholders. This approach ensures that security considerations are an integral part of the entire software development lifecycle.
Zero Trust architecture: The traditional perimeter-based security model is being replaced by the Zero Trust framework, which operates on the principle of “never trust, always verify.” This means verifying every user and device, regardless of whether they are inside or outside the organization’s network.
Increased use of encryption: With data breaches on the rise, there is a growing trend towards the use of robust encryption methods to protect data both in transit and at rest. Advanced cryptographic techniques, like homomorphic encryption, are gaining traction, allowing data to be processed while still encrypted.
Focus on secure code practices: There’s an increasing emphasis on training developers in secure coding practices. This includes regular code reviews, vulnerability testing, and using static and dynamic analysis tools to identify and mitigate security flaws during the development phase.
Rise of cybersecurity mesh: This concept refers to a flexible, modular approach to security, where each device gets its own security, like firewalls and network safeguards. It helps in creating a more responsive and adaptable security infrastructure, capable of handling the dynamic nature of modern cyber threats, making the whole network safer.
## Further adoption of AR and VR
With AR and VR technologies becoming more accessible, demand for such applications is skyrocketing across multiple industries:
**Education:** VR transforms education, enabling interactive history, geography, and science lessons, and offering risk-free medical training through virtual surgery simulations. For example, through Google Expeditions and other educational AR apps, students can explore historical sites, dissect virtual animals, or examine 3D models of complex subjects.
**Healthcare:** For example AccuVein, an AR app, helps locate veins for easier needle insertion, and surgical planning tools that overlay 3D models onto a patient’s anatomy for precise surgical guidance.
**Business:** VR is increasingly used in business for prototyping, staff training, and customer service. In the real estate industry, companies utilize VR/AR to provide virtual property tours and AR apps to visualize how furniture or renovations might look in a space before making a purchase.
The exciting developments we look forward to in 2024, among others, include:
**Hyper-realistic virtual reality:** VR can now simulate real-world sensations, like the feel of rain or the smell of a summer meadow, blurring the line between virtual and reality. And this trend is set to grow.
**Expansion of social VR platforms:** Social VR platforms allow for real-time interactions, hosting virtual parties, attending concerts, and engaging in multiplayer games.
**Integration of AI in VR: **AI personalizes experiences by adapting to user behavior, creating dynamic environments that respond to individual preferences and actions.
Techxpert provides the facility for app development. For more information, visit [techxpert.io](https://techxpert.io/). | asadbashir | |
1,867,927 | Advanced CSS techniques for modern websites | In web development, Cascading Style Sheets (CSS) are essential because they let developers give their... | 0 | 2024-05-28T19:21:07 | https://dev.to/asadbashir/advanced-css-techniques-for-modern-websites-2nl5 | In web development, Cascading Style Sheets (CSS) are essential because they let developers give their pages personality and flair. This is the perfect spot for you if you want to improve your CSS abilities! We will explore the world of CSS in this advanced blog article, with a particular emphasis on the thorough lesson on CSS Introduction offered by Webtutor.dev. Prepare to learn more about CSS and uncover cutting-edge methods and best practices.
## Enhancing CSS Performance: Methods and Resources
Retaining web pages that load quickly requires efficient CSS code. We'll look at more complex methods of improving CSS performance, like using CSS preprocessors, eliminating render-blocking CSS, and reducing file size. The Webtutor.dev guide will offer advice on useful tools and insights into performance optimisation techniques.
### CSS Grid and Flexbox Layouts
Web design has been completely transformed by contemporary CSS layout approaches like Flexbox and Grid. We'll go deeply into these potent instruments, examining their characteristics, optimum uses, and features. You can learn how to create responsive and flexible layouts with the help of the Webtutor.dev guide, which provides tutorials and real-world examples.
### Sophisticated Pickers and Counterfeit Classes
You can target particular web page elements with CSS selectors. We'll go into more complex selectors, such as attribute selectors, sibling combinators, and pseudo-classes, as we get beyond the fundamentals. The blog will showcase practical situations where these selectors work well, giving you the ability to craft focused and expressive styles.
### CSS Animations and Transitions
Subtle transitions and animations can significantly improve the user experience. We'll go deep into CSS animations and transitions, covering sophisticated methods including timing functions, keyframes, and intricate animations. The Webtutor.dev guide will offer helpful hints and examples for producing fluid and eye-catching animations.
### Creating Form Element Style
Web applications cannot function properly without forms, and altering their look can significantly increase both their usability and appearance. We'll look at advanced CSS styling methods for form elements, such as how to style input fields, radio buttons, checkboxes, and dropdown menus. The blog will offer suggestions for cross-browser compatibility as well as innovative examples.
## Advanced Media Queries and Breakpoints in Responsive Design
Developing websites that adjust to various screen sizes requires the use of responsive design. We'll delve into more complex media queries and breakpoints so you can create layouts that are responsive and fluid across a range of devices. Examples of responsive design patterns and advice on handling intricate layouts are provided in the Webtutor.dev guide.
## Compatibility with Multiple Browsers and CSS Prefixing
It can be difficult to guarantee consistent rendering across various web browsers. We'll go through sophisticated methods like CSS prefixing, vendor-specific attributes, and polyfills that help achieve cross-browser compatibility. The blog will offer information about browser support tables and techniques for resolving peculiarities unique to individual browsers.
## In summary
You now have the information to develop your CSS skills as we wrap up our investigation of advanced CSS techniques and best practices under the direction of Webtutor.dev's CSS Introduction guide. Don't forget to practise, experiment, and keep up with new CSS techniques and trends. You'll be able to make gorgeous, functional, and responsive web designs with the knowledge you get from this extensive guide.
Techxpert provides the facility for web development. For more information, visit [techxpert.io](https://techxpert.io/).
| asadbashir | |
1,867,934 | The importance of accessibility in web design and web development | The process of creating a webpage that is accessible to all users, including those with limitations,... | 0 | 2024-05-28T19:21:04 | https://dev.to/asadbashir/the-importance-of-accessibility-in-web-design-and-web-development-non | The process of creating a webpage that is accessible to all users, including those with limitations, disabilities, and impairments, is known as web accessibility. Developing an accessible web page is putting in place elements that let people view your material in the same way as someone without any restrictions. This guarantees that your content is available to everyone. Given that 1 in 5 individuals in the UK have a disability or impairment, you need to make sure your website is user-friendly for everyone.
Websites and online applications that are accessible through inclusive design are guaranteed to be useable by people with a range of skills and limitations. It encourages inclusive design, making digital material accessible and interactive for all people, irrespective of their cognitive or physical capabilities.
The following are some design strategies that can be implemented to support accessibility for everyone:
## Audio and video transcripts.
Use color contrast to help individuals who are color blind navigate your page and comprehend any visual content you present.
the ability to change the background noise.
Add alt text to photographs so that those who are blind or visually impaired can comprehend them.
The process of inclusive design is continual and entails constant refinement as well as a dedication to comprehending and serving the needs of every user. A more inclusive online experience can be achieved by keeping up with accessibility standards and including users of various abilities in the design and testing phases.
## Law Adherence
Website accessibility is mandated by laws and regulations in several countries. It is not only a best practice but frequently a legal duty to ensure accessibility; non-compliance can lead to legal problems and fines.
## To meet the WCAG accessibility guidelines, there are four requirements.
### Perceivable:
For everyone to comprehend and be aware of the content on your website, it must be presented in a way that is easily understood by all.
Operable: A website must be free from errors and allow users to explore and utilize all of its features.
### Understandable:
Your website's content needs to be readable and clear so that all visitors can interact and comprehend it. This extends beyond textual information; each user should be able to discern the layout and visuals on your website.
### Robust:
In order to be viewed by visitors who use assistive technology like screen readers, the content needs to be compatible with both present and future users.
Have your team evaluate your website or mobile app to ensure that it complies with WCAG 2.2 criteria and to find any accessibility problems. Make a plan to address the issues once you are aware of them. To assist your web team in making the required modifications, use a guide, and don't forget to post an accessibility declaration.
### Increased Audience Reach
Your potential audience grows as you make your site material accessible. This encompasses older adults, those with disabilities, and users of a wide variety of gadgets and technology, including speech recognition software, screen readers, and alternate input methods.
Because 90% of websites are inaccessible to people with disabilities or other limitations, businesses who do not build their websites with these users in mind are missing out on a significant portion of their audience. An accessible website aims to provide a welcoming and inclusive experience for all users, not only those who must comply with legal obligations. You can increase the potential reach of your website and promote a more varied and inclusive online community by making your content accessible.
### Enhancing User Experience
Improvements in accessibility frequently result in a better user experience overall. A dismaying 88% of users will never return to a website that provides a bad user experience, underscoring the importance of intuitive navigation, well-structured information, and flexible design for all users—not just those with impairments.
You may make your design and development processes more effective, inclusive, and pleasant for all site visitors by implementing accessibility principles.
### Optimizing for Search Engines (SEO)
The process of optimizing a website or online content for search engines is known as search engine optimization (SEO). The aim of this technique is to increase the likelihood that a website or page will show up higher in the search results when people enter relevant search phrases. Because accessible design frequently complies with best SEO principles, search engines give priority to websites that are accessible. Rich, well-organized content, insightful links, and alt text for images all improve search engine rankings.
### Reputation of Brands
Making a show of being accessible improves the perception of your company. Businesses and websites that prioritise diversity are valued by 59% of users, and this can positively impact your organisation's reputation.
A good brand reputation is largely dependent on having an accessible website. Your brand can gain a competitive advantage in the market, enhanced client loyalty, and favorable word-of-mouth by showcasing a dedication to diversity and user-friendly experiences.
### Prospective-Looking
When you design a website with accessibility in mind, it becomes more flexible to future developments in technology. Accessible websites are better positioned to provide new features and stay current as technology advances. A well-thought-out investment in the longevity and flexibility of your online presence, an accessible website positions your company for success in the here and now and guarantees that your online assets will hold up well as user expectations and technological advancements change.
## Moral Aspects to Take into Account
Making websites accessible is not only a matter of technology; it's also morally right. Ensuring universal accessibility to and utilization of online resources fosters a fairer and more inclusive virtual community.
It is an ethical duty to maintain an accessible website. It is consistent with ethical design principles and adds to a more just and equitable digital environment by demonstrating a dedication to inclusivity, justice, and the welfare of all users.
The significance of web development for accessibility
In conclusion, web accessibility is an essential component of conscientious and progressive web development, not merely a checkbox. It guarantees adherence to rules and creates avenues for creativity, increased audience involvement, and enhanced user experiences.
Techxpert provides the facility for web development. For more information, visit [techxpert.io](https://techxpert.io/). | asadbashir | |
1,867,938 | Role of JavaScript frameworks in Web Development | Greetings from the thrilling field of web development! JavaScript frameworks have become the... | 0 | 2024-05-28T19:21:01 | https://dev.to/asadbashir/role-of-javascript-frameworks-in-web-development-3lic | Greetings from the thrilling field of web development! JavaScript frameworks have become the technological super heroes of this digital age, when advancements in technology are continually being made. They enable dynamic and interactive websites. It's important to comprehend the function of these frameworks in contemporary web development, regardless of experience level.
Come explore how JavaScript frameworks are influencing the internet's future and enabling developers all over the world, from optimizing development processes to improving user experience. Prepare to advance your knowledge and discover countless opportunities with this intriguing blog post!
## Overview of JavaScript Frameworks
Since JavaScript can be used to construct dynamic and interactive webpages, it has become one of the most widely used computer languages for online development. JavaScript develops in tandem with web development. Modern online apps are becoming more and more complicated, therefore developers are always seeking for ways to increase productivity and optimize their process. JavaScript frameworks are useful in this situation.
We will go over the fundamentals of JavaScript frameworks, their advantages, and the reasons they have become so important to contemporary web development in this section.
A JavaScript framework is a precompiled code set that offers an organized way to create online apps. It provides programmers with a collection of conventions, libraries, and tools to make the process of creating intricate and reliable online applications easier. In essence, it frees developers from having to spend time on tedious chores like event handling and DOM manipulation so they can concentrate on building specialized functionality.
Today's market is filled with several JavaScript frameworks, each of which serves a distinct purpose and kind of project. Frontend (client-side) and backend (server-side) frameworks are the two primary categories.
Frontend frameworks, like AngularJS, Vue.js, and ReactJS, enable developers to effectively control data flow between components, which enables them to concentrate on building user interfaces. Conversely, server-side scripting features offered by backend frameworks such as Node.js enable developers to create scalable servers using just JavaScript.
## Benefits Of JavaScript Framework Utilization
Because of all of its benefits, JavaScript frameworks have grown in popularity among web developers in recent years. We will look at a few of the main benefits of utilizing JavaScript frameworks in contemporary web development in this part.
### 1. Quicker Time to Development
JavaScript frameworks are very popular because they make it possible for developers to create websites and applications much more quickly than they could with traditional JavaScript coding. These frameworks save developers a great deal of time and effort by offering pre-built libraries, components, and modules that are simple to integrate into projects. Developers may now focus on creating new features and raising the overall quality of their project instead of writing repetitious code from scratch thanks to ready-made code snippets and built-in functionalities.
### 2. Increased Effectiveness
JavaScript frameworks increase the productivity of development teams by offering a uniform structure and design principles. When working in a team, this is especially helpful because everyone adheres to the same coding standards, which promotes more consistency between projects. Furthermore, by delegating tasks inside an application, frameworks facilitate simple collaboration between front-end designers and back-end developers.
### 3. Platform Interoperability
Because JavaScript frameworks are platform-independent, they can function flawlessly across a range of devices without experiencing significant compatibility problems. Because there is no need to create various versions for different platforms, such desktops and mobile devices, this significantly decreases development time.
### 4. Sturdy Community Assistance
The majority of well-known JavaScript frameworks, such as Angular, React, and Vue, have sizable developer communities committed to helping one another out via blogs, tutorials, forums, and other resources.
## JavaScript Framework Types
JavaScript is a computer language that is both powerful and versatile, and it has become a crucial tool in contemporary web development. JavaScript has swiftly taken the lead among programming languages since it can be used to create dynamic and interactive elements for websites. Nonetheless, the complexity of web applications increases along with the demand for well-organized, effective code. JavaScript frameworks are useful in this situation.
Pre-written code libraries known as JavaScript frameworks give programmers a set of capabilities and tools to make sophisticated application development faster and easier. These frameworks' increased popularity can be attributed to their capacity to improve coding structure, streamline routine web development chores, identify and fix bugs, and improve user experience.
Let's examine more closely at the many kinds of JavaScript frameworks that are frequently utilized in contemporary web development:
## - Frameworks for the front end (React, Angular, Vue.Js)
The most popular programming language for front-end development is JavaScript, and front-end frameworks have become essential to contemporary online development. These frameworks give programmers access to a collection of resources and tools that facilitate the creation of dynamic and interactive user interfaces. React, Angular, and Vue.js are now the most widely used JavaScript front-end frameworks.
Facebook created the JavaScript library React for creating user interfaces. It is a popular option for large-scale applications due to its scalability and simplicity. React is a component-based architecture, which divides the user interface into manageable, reusable parts. This facilitates easy maintenance and upgrades in addition to organizing code. Additionally, React makes use of Virtual DOM (Document Object Model), which decreases browser re-rendering times and boosts performance.
Angular is another well-liked framework in the front-end developer community. Angular, a Google product, gives developers tools like declarative templates, dependency injection, and two-way data binding to make complicated coding tasks easier. A primary benefit of utilizing Angular is its robust command-line interface (CLI), which facilitates the development of extremely functioning single-page applications (SPAs). Compared to other frameworks, Angular may have a steep learning curve, but once mastered, it can result in an efficient code structure and speedier app development.
Due to its ability to perfectly combine the organized approach of Angular with the simplicity of React, Vue.js has seen tremendous growth in popularity in recent years. Vue.js, which was developed by Evan You in 2014, is well-known for its progressive adoption feature, which makes it simple to include into already-existing projects. An increasing number of developers are selecting Vue.js for their front-end projects due to its small size, simple learning curve, and excellent performance.
## - Back-end frameworks, such as Express.js and Node.js
Modern web development requires back-end frameworks, among which Node.js and Express.js are two of the most widely used choices. Because these frameworks are based on JavaScript, they are an effective tool for developing server-side applications that are scalable and efficient. We will examine the features and advantages of Express.js and Node.js for back-end development in this part.
With the help of the JavaScript runtime environment Node.js, programmers may create server-side JavaScript code. Because Node.js uses the Google Chrome V8 engine, which is renowned for its quick efficiency, code execution is extremely efficient. It can also manage a high number of concurrent connections without slowing down or crashing thanks to its non-blocking I/O strategy. Because of this functionality, it's the perfect option for creating real-time applications like online games or chat apps.
Conversely, Express.js is a Node.js web application framework. It offers a complete feature set and set of tools to help developers quickly and effectively create server-side applications. The simplicity of development with Express.js is one of its key benefits. It is a simple, lightweight framework that gives developers more freedom to customize the architecture and code.
A vast array of middleware options, or actions that can be performed on incoming requests prior to them reaching the server's final handler, are another feature that Express.js provides. Through the use of modules, developers may expand the functionality of their applications without having to worry about their code being too large. These middleware programs are capable of managing various duties like error handling, logging, and authentication.
## How Frameworks for JavaScript Aid in Web Development
In recent years, JavaScript frameworks have completely changed the web development industry. These effective and potent technologies have grown to be a necessary component of the developer toolkit, enabling them to easily design dynamic and interactive websites.
However, what are JavaScript frameworks precisely, and how might they support web development? We will delve into these frameworks' specifics and examine their function in contemporary web development in this part.
JavaScript frameworks are pre-written code collections that give programmers an organized approach to use JavaScript to create online applications. They provide a range of pre-made parts, libraries, and functions that are simple to incorporate into a project in order to accomplish particular goals.
The most widely used JavaScript frameworks include jQuery, Ember.js, Vue.js, React, and Angular. Every framework has unique qualities and advantages that make it appropriate for a variety of project kinds.
### 1. Quicker Process of Development
The fact that JavaScript frameworks greatly accelerate the development process is one of its key benefits. Developers can concentrate on creating distinctive features instead of wasting time writing repetitive code from scratch when they have access to pre-written code libraries.
Additionally, the Model-View-Controller (MVC) architecture, which aids in the effective organization of code, is used by the majority of contemporary JavaScript frameworks. This shortens the time needed for development overall and speeds up prototyping.
### 2. Uniformity Throughout Projects
Every framework, as previously said, provides a set of predetermined guidelines for creating applications, which makes it simpler for developers to preserve consistency across projects. For example, another developer who is familiar with the framework can work on a project developed using React without having to learn a whole new system.
The maintenance of a neat and organized codebase, which facilitates developer collaboration and large-scale application maintenance, is another benefit of consistency.
### 3. Interoperability Across Browsers
Making sure websites are functional with a variety of browsers is a common difficulty for developers. Cross-browser compatibility capabilities are a built-in feature of JavaScript frameworks, which minimizes the effort required to make webpages run on many platforms and devices.
### 4. Sturdiness and Expandability
Before being made available to developers, the pre-written code libraries included in JavaScript frameworks go through extensive testing and optimization. This lessens the possibility of errors and faults, strengthening online apps.
These frameworks are very scalable for intricate applications since they can manage massive volumes of data effectively.
### 5. Design that is responsive
Websites must now be responsive to all screen sizes due to the rise in mobile usage. Numerous JavaScript frameworks include responsive design options that automatically modify the content layout to fit the screen size of the device.
This results in a more uniform user experience across all platforms by saving developers from having to manually make adjustments to accommodate different devices.
JavaScript Frameworks' Function In Contemporary Web Development
JavaScript frameworks have transformed the way we create and design websites, becoming a necessary component of contemporary web development. These useful tools make it simpler and more effective for developers to create complicated web apps by giving them access to pre-written code that can be quickly integrated into their projects.
JavaScript frameworks' growing popularity can be attributed, in part, to their capacity to streamline the development process and enhance the overall functioning of websites. Programmers had to start from scratch when writing JavaScript code in the old days, which was error-prone and time-consuming. Frameworks solve this problem by offering an organized codebase that can be expanded and altered to meet the demands of particular projects.
Moreover, JavaScript frameworks facilitate cross-browser compatibility, which implies that websites developed with these resources will operate flawlessly across various browsers, including Google Chrome, Mozilla Firefox, Safari, and others. Because they are no longer concerned with building code customized to a certain browser, developers are able to save a substantial amount of time and effort.
The large plugin libraries of JavaScript frameworks, which provide a variety of functionalities including animations, data manipulation, form validation, and more, are another significant benefit of adopting them. Developers no longer need to start from scratch when adding sophisticated features and interaction to their websites thanks to these plugins.
Additionally, JavaScript frameworks facilitate the idea of Document Object Model manipulation, or "DOM." Browsers employ the Document Object Model (DOM) interface to dynamically access and modify HTML components on a webpage. With its streamlined syntax, framework usage greatly simplifies DOM manipulation and makes it easier for developers to create dynamic web pages.
Finally, JavaScript frameworks help make projects more maintainable and scalable. Coding standards and design patterns enable developers to organize their code in a way that makes it simple to read and maintain. This guarantees that a project will stay manageable and simple for several developers to handle even as it becomes more complex.
## In summary
With the help of JavaScript frameworks, web development is now far more effective, scalable, and potent than it was in the past. With their extensive feature set and plugin library, these technologies are a must-have for every contemporary web developer trying to create dynamic, user-friendly websites.
Techxpert provides the facility for app development. For more information, visit [techxpert.io](https://techxpert.io/). | asadbashir |
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