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React 50 Example

<div>Certainly, here are some examples related to React and Redux: <ol> <li> React Example: </li> </ol> <div class="highlight js-code-highlight"> <pre class="highlight jsx"><code> import React, { useState } from 'react'; const Counter = () => { const [count, setCount] = useState(0); const increment = () => setCount(count + 1); const decrement = () => setCount(count - 1); return ( <div> <p>Count: {count}</p> <button onClick={increment}>Increment</button> <button onClick={decrement}>Decrement</button> </div> ); }; export default Counter; </code></pre> </div> <ol> <li> Redux Example: <ul> <li>Actions: </li> </ul> <pre class="highlight javascript"><code> // action types const INCREMENT = 'INCREMENT'; const DECREMENT = 'DECREMENT'; // action creators const increment = () => ({ type: INCREMENT }); const decrement = () => ({ type: DECREMENT }); </code></pre> </li> </ol> <ul> <li> Reducer: <pre class="highlight javascript"><code> const counterReducer = (state = 0, action) => { switch (action.type) { case INCREMENT: return state + 1; case DECREMENT: return state - 1; default: return state; } }; </code></pre> </li> <li> Store: <pre class="highlight javascript"><code> import { createStore } from 'redux'; const store = createStore(counterReducer); </code></pre> </li> <li> Connecting React Component: <pre class="highlight jsx"><code> import React from 'react'; import { useSelector, useDispatch } from 'react-redux'; import { increment, decrement } from './actions'; const Counter = () => { const count = useSelector((state) => state); const dispatch = useDispatch(); return ( <div> <p>Count: {count}</p> <button onClick={() => dispatch(increment())}>Increment</button> <button onClick={() => dispatch(decrement())}>Decrement</button> </div> ); }; export default Counter; </code></pre> </li> </ul> These examples cover a basic React component and a simple Redux setup with actions, a reducer, and a connected React component. Certainly, let's delve into more topics with additional example code: <ol> <li> React Router Example: <ul> <li>Installation: </li> </ul> <pre class="highlight shell"><code> npm install react-router-dom </code></pre> </li> </ol> <ul> <li> Usage: <pre class="highlight jsx"><code> import React from 'react'; import { BrowserRouter as Router, Route, Link } from 'react-router-dom'; const Home = () => <h2>Home</h2>; const About = () => <h2>About</h2>; const App = () => ( <Router> <nav> <Link to="/">Home</Link> <Link to="/about">About</Link> </nav> <Route path="/" exact component={Home} /> <Route path="/about" component={About} /> </Router> ); export default App; </code></pre> </li> </ul> <ol> <li> Redux Thunk Example: <ul> <li>Installation: </li> </ul> <pre class="highlight shell"><code> npm install redux-thunk </code></pre> </li> </ol> <ul> <li> Usage (Action with Thunk): <pre class="highlight javascript"><code> // Action Creator using Thunk const fetchData = () => { return (dispatch) => { dispatch({ type: 'FETCH_DATA_REQUEST' }); // Perform asynchronous operation (e.g., API call) fetch('https://api.example.com/data') .then((response) => response.json()) .then((data) => dispatch({ type: 'FETCH_DATA_SUCCESS', payload: data })) .catch((error) => dispatch({ type: 'FETCH_DATA_FAILURE', payload: error })); }; }; </code></pre> </li> </ul> <ol> <li> CSS Modules Example: <ul> <li>Styles in <code>styles.module.css</code>: </li> </ul> <pre class="highlight css"><code> .button { background-color: #3498db; color: #fff; padding: 10px; border: none; border-radius: 4px; cursor: pointer; } </code></pre> </li> </ol> <ul> <li> React Component using CSS Modules: <pre class="highlight jsx"><code> import React from 'react'; import styles from './styles.module.css'; const Button = () => ( <button className={styles.button} onClick={() => console.log('Button clicked')}> Click me </button> ); export default Button; </code></pre> </li> </ul> <ol> <li> Server-Side Rendering (SSR) Example: <ul> <li>Server-side entry point: </li> </ul> <pre class="highlight jsx"><code> import express from 'express'; import React from 'react'; import { renderToString } from 'react-dom/server'; import App from './App'; const server = express(); server.get('/', (req, res) => { const appString = renderToString(<App />); res.send(` <!DOCTYPE html> <html> <head> <title>React SSR Example</title> </head> <body> <div id="app">${appString}</div> <script src="/bundle.js"></script> </body> </html> `); }); server.listen(3000, () => { console.log('Server is listening on port 3000'); }); </code></pre> </li> </ol> <ul> <li> Client-side entry point (bundle.js): <pre class="highlight jsx"><code> import React from 'react'; import ReactDOM from 'react-dom'; import App from './App'; ReactDOM.hydrate(<App />, document.getElementById('app')); </code></pre> </li> </ul> These examples cover React Router, Redux Thunk, CSS Modules, and Server-Side Rendering, showcasing various aspects of React and Redux ecosystem. Certainly, let's explore additional topics with corresponding example code: <ol> <li> GraphQL Example with Apollo Client: <ul> <li>Installation: </li> </ul> <pre class="highlight shell"><code> npm install @apollo/client graphql </code></pre> </li> </ol> <ul> <li> Usage (Fetching data with GraphQL): <pre class="highlight jsx"><code> import React from 'react'; import { useQuery } from '@apollo/client'; import { gql } from 'graphql-tag'; const GET_USERS = gql` query { users { id name } } `; const UserList = () => { const { loading, error, data } = useQuery(GET_USERS); if (loading) return <p>Loading...</p>; if (error) return <p>Error: {error.message}</p>; return ( <ul> {data.users.map((user) => ( <li key={user.id}>{user.name}</li> ))} </ul> ); }; export default UserList; </code></pre> </li> </ul> <ol> <li> WebSocket Example with Socket.io: <ul> <li>Installation: </li> </ul> <pre class="highlight shell"><code> npm install socket.io-client </code></pre> </li> </ol> <ul> <li> Usage (Connecting to a WebSocket server): <pre class="highlight jsx"><code> import React, { useEffect } from 'react'; import io from 'socket.io-client'; const ChatApp = () => { useEffect(() => { const socket = io('http://localhost:3001'); socket.on('message', (data) => { console.log('Received message:', data); }); // Clean up the socket connection on component unmount return () => { socket.disconnect(); }; }, []); return <div>WebSocket Chat App</div>; }; export default ChatApp; </code></pre> </li> </ul> <ol> <li> Firebase Authentication Example: <ul> <li>Installation: </li> </ul> <pre class="highlight shell"><code> npm install firebase </code></pre> </li> </ol> <ul> <li> Usage (Firebase authentication in React): <pre class="highlight jsx"><code> import React, { useState } from 'react'; import firebase from 'firebase/app'; import 'firebase/auth'; const firebaseConfig = { apiKey: 'your-api-key', authDomain: 'your-auth-domain', // ... other config options }; firebase.initializeApp(firebaseConfig); const AuthExample = () => { const [user, setUser] = useState(null); const handleSignIn = async () => { const provider = new firebase.auth.GoogleAuthProvider(); try { const result = await firebase.auth().signInWithPopup(provider); setUser(result.user); } catch (error) { console.error('Authentication error:', error); } }; return ( <div> {user ? ( <p>Welcome, {user.displayName}!</p> ) : ( <button onClick={handleSignIn}>Sign in with Google</button> )} </div> ); }; export default AuthExample; </code></pre> </li> </ul> These examples cover GraphQL integration with Apollo Client, WebSocket communication with Socket.io, and Firebase authentication in React. Feel free to explore and adapt these examples to your specific use cases. Certainly, let's continue exploring more topics with corresponding example code: <ol> <li> Testing with Jest and Enzyme: <ul> <li>Installation: </li> </ul> <pre class="highlight shell"><code> npm install jest enzyme enzyme-to-json enzyme-adapter-react-16 --save-dev </code></pre> </li> </ol> <div class="highlight js-code-highlight"> <pre class="highlight plaintext"><code>- Usage (Sample test using Jest and Enzyme): </code></pre> </div> <div class="highlight js-code-highlight"> <pre class="highlight plaintext"><code> ```jsx import React from 'react'; import { shallow } from 'enzyme'; import toJson from 'enzyme-to-json'; import MyComponent from './MyComponent'; describe('MyComponent', () => { it('renders correctly', () => { const wrapper = shallow(<MyComponent />); expect(toJson(wrapper)).toMatchSnapshot(); }); it('handles click event', () => { const mockOnClick = jest.fn(); const wrapper = shallow(<MyComponent onClick={mockOnClick} />); wrapper.find('button').simulate('click'); expect(mockOnClick).toHaveBeenCalledTimes(1); }); }); ``` </code></pre> </div> <ol> <li> Storybook Example: <ul> <li>Installation: </li> </ul> <pre class="highlight shell"><code> npx sb init </code></pre> </li> </ol> <div class="highlight js-code-highlight"> <pre class="highlight plaintext"><code>- Usage (Creating a simple story in Storybook): - Create a `Button.js` component: </code></pre> </div> <div class="highlight js-code-highlight"> <pre class="highlight plaintext"><code> ```jsx import React from 'react'; const Button = ({ label, onClick }) => ( <button onClick={onClick}>{label}</button> ); export default Button; ``` </code></pre> </div> <div class="highlight js-code-highlight"> <pre class="highlight plaintext"><code> - Create a `Button.stories.js` file: </code></pre> </div> <div class="highlight js-code-highlight"> <pre class="highlight plaintext"><code> ```jsx import React from 'react'; import Button from './Button'; export default { title: 'Button', component: Button, }; const Template = (args) => <Button {...args} />; export const Primary = Template.bind({}); Primary.args = { label: 'Primary Button', onClick: () => console.log('Button clicked'), }; ``` </code></pre> </div> <div class="highlight js-code-highlight"> <pre class="highlight plaintext"><code> - Run Storybook: </code></pre> </div> <div class="highlight js-code-highlight"> <pre class="highlight plaintext"><code> ```bash npx sb ``` </code></pre> </div> <ol> <li> Code Splitting with React Lazy and Suspense: <ul> <li>Usage (Lazy loading a component with React Lazy and Suspense): </li> </ul> <pre class="highlight jsx"><code> import React, { lazy, Suspense } from 'react'; const LazyComponent = lazy(() => import('./LazyComponent')); const App = () => ( <div> <Suspense fallback={<div>Loading...</div>}> <LazyComponent /> </Suspense> </div> ); export default App; </code></pre> </li> <li> CSS-in-JS with styled-components: <ul> <li>Installation: </li> </ul> <pre class="highlight shell"><code> npm install styled-components </code></pre> </li> </ol> <div class="highlight js-code-highlight"> <pre class="highlight plaintext"><code>- Usage (Styling a component with styled-components): </code></pre> </div> <div class="highlight js-code-highlight"> <pre class="highlight plaintext"><code> ```jsx import React from 'react'; import styled from 'styled-components'; const StyledButton = styled.button` background-color: #3498db; color: #fff; padding: 10px; border: none; border-radius: 4px; cursor: pointer; `; const StyledComponent = () => ( <StyledButton onClick={() => console.log('Styled button clicked')}> Click me </StyledButton> ); export default StyledComponent; ``` </code></pre> </div> Feel free to explore these examples to gain insights into testing with Jest and Enzyme, using Storybook for component development, implementing code splitting with React Lazy and Suspense, and styling components with CSS-in-JS using styled-components. Certainly, let's explore additional topics with corresponding example code: <ol> <li> Responsive Design with CSS Media Queries: <ul> <li>Usage (Creating a responsive layout using CSS media queries): </li> </ul> <pre class="highlight css"><code> /* Regular styles */ .container { width: 100%; margin: 0 auto; } /* Media query for screens smaller than 768px */ @media screen and (max-width: 768px) { .container { width: 90%; } } </code></pre> </li> <li> Error Boundary Example: <ul> <li>Usage (Implementing an error boundary in React): </li> </ul> <pre class="highlight jsx"><code> import React, { Component } from 'react'; class ErrorBoundary extends Component { constructor(props) { super(props); this.state = { hasError: false }; } static getDerivedStateFromError(error) { return { hasError: true }; } componentDidCatch(error, errorInfo) { logErrorToService(error, errorInfo); } render() { if (this.state.hasError) { return <h1>Something went wrong.</h1>; } return this.props.children; } } export default ErrorBoundary; </code></pre> </li> <li> JWT Authentication in React: <ul> <li>Usage (Handling JWT authentication in a React app): </li> </ul> <pre class="highlight jsx"><code> import React, { useState, useEffect } from 'react'; const App = () => { const [user, setUser] = useState(null); useEffect(() => { const token = localStorage.getItem('jwtToken'); if (token) { // Verify the token on the server and set the user accordingly verifyToken(token); } }, []); const handleLogin = (token) => { // Save token to localStorage and set the user localStorage.setItem('jwtToken', token); verifyToken(token); }; const handleLogout = () => { // Remove token from localStorage and reset the user localStorage.removeItem('jwtToken'); setUser(null); }; const verifyToken = (token) => { // Send token to server for verification // Set the user if verification is successful }; return ( <div> {user ? ( <button onClick={handleLogout}>Logout</button> ) : ( <button onClick={() => handleLogin('exampleToken')}>Login</button> )} </div> ); }; export default App; </code></pre> </li> <li> Serverless Function Example: <ul> <li> Usage (Creating a serverless function with Netlify Functions): <ul> <li>Create a file named <code>hello.js</code> in the <code>netlify/functions</code> directory: </li> </ul> <pre class="highlight javascript"><code>exports.handler = async (event, context) => { return { statusCode: 200, body: JSON.stringify({ message: 'Hello, World!' }), }; }; </code></pre> </li> </ul> </li> </ol> <div class="highlight js-code-highlight"> <pre class="highlight plaintext"><code> - Deploy your site to Netlify, and the function becomes available at `/.netlify/functions/hello`. </code></pre> </div> Feel free to explore these examples covering responsive design with CSS media queries, implementing an error boundary in React, handling JWT authentication, and creating a serverless function using Netlify Functions. Certainly, let's delve into additional topics with corresponding example code: <ol> <li> Redux Persist for Persistent State: <ul> <li>Installation: </li> </ul> <pre class="highlight shell"><code> npm install redux-persist </code></pre> </li> </ol> <ul> <li> Usage (Persisting Redux state to local storage): <pre class="highlight jsx"><code> import { createStore } from 'redux'; import { persistStore, persistReducer } from 'redux-persist'; import storage from 'redux-persist/lib/storage'; import rootReducer from './reducers'; const persistConfig = { key: 'root', storage, }; const persistedReducer = persistReducer(persistConfig, rootReducer); const store = createStore(persistedReducer); const persistor = persistStore(store); export { store, persistor }; </code></pre> </li> </ul> <ol> <li> Internationalization (i18n) Example with react-intl: <ul> <li>Installation: </li> </ul> <pre class="highlight shell"><code> npm install react-intl </code></pre> </li> </ol> <ul> <li> Usage (Implementing internationalization in a React app): <pre class="highlight jsx"><code> import React from 'react'; import { FormattedMessage, IntlProvider } from 'react-intl'; const messages = { en: { greeting: 'Hello!', }, fr: { greeting: 'Bonjour!', }, }; const App = ({ locale }) => ( <IntlProvider locale={locale} messages={messages[locale]}> <div> <FormattedMessage id="greeting" /> </div> </IntlProvider> ); export default App; </code></pre> </li> </ul> <ol> <li> Integration with WebSockets using Socket.io: <ul> <li>Installation: </li> </ul> <pre class="highlight shell"><code> npm install socket.io-client </code></pre> </li> </ol> <ul> <li> Usage (Connecting to a WebSocket server with Socket.io): <pre class="highlight jsx"><code> import React, { useEffect } from 'react'; import io from 'socket.io-client'; const ChatApp = () => { useEffect(() => { const socket = io('http://localhost:3001'); socket.on('message', (data) => { console.log('Received message:', data); }); return () => { socket.disconnect(); }; }, []); return <div>WebSocket Chat App</div>; }; export default ChatApp; </code></pre> </li> </ul> <ol> <li> Using React Portals: <ul> <li>Usage (Creating a portal in React): </li> </ul> <pre class="highlight jsx"><code> import React from 'react'; import ReactDOM from 'react-dom'; const PortalComponent = () => { const portalRoot = document.getElementById('portal-root'); const portalContent = <div>Content rendered in portal</div>; return ReactDOM.createPortal(portalContent, portalRoot); }; export default PortalComponent; </code></pre> </li> </ol> Feel free to explore these examples covering Redux Persist for persistent state, internationalization with react-intl, integration with WebSockets using Socket.io, and the use of React Portals. Adapt and experiment with these concepts based on your application's requirements. Certainly, let's continue exploring more topics with corresponding example code: <ol> <li> Web Workers in React: <ul> <li>Usage (Creating and using a Web Worker in a React app): </li> </ul> <pre class="highlight jsx"><code> // main.js import React, { useEffect } from 'react'; import MyWorker from './my.worker'; const App = () => { useEffect(() => { const worker = new MyWorker(); worker.postMessage({ message: 'Hello from main thread!' }); worker.onmessage = (event) => { console.log('Received message from Web Worker:', event.data); }; return () => { worker.terminate(); }; }, []); return <div>Web Worker Example</div>; }; export default App; </code></pre> </li> </ol> <div class="highlight js-code-highlight"> <pre class="highlight plaintext"><code> ```js // my.worker.js self.onmessage = (event) => { console.log('Received message in Web Worker:', event.data); self.postMessage({ message: 'Hello from Web Worker!' }); }; ``` </code></pre> </div> <ol> <li> Form Handling in React: <ul> <li>Usage (Handling form input in a React component): </li> </ul> <pre class="highlight jsx"><code> import React, { useState } from 'react'; const FormExample = () => { const [formData, setFormData] = useState({ username: '', password: '', }); const handleChange = (e) => { setFormData({ ...formData, [e.target.name]: e.target.value }); }; const handleSubmit = (e) => { e.preventDefault(); console.log('Form submitted with data:', formData); }; return ( <form onSubmit={handleSubmit}> <label> Username: <input type="text" name="username" value={formData.username} onChange={handleChange} /> </label> <br /> <label> Password: <input type="password" name="password" value={formData.password} onChange={handleChange} /> </label> <br /> <button type="submit">Submit</button> </form> ); }; export default FormExample; </code></pre> </li> <li> React Helmet for Managing Head in React: <ul> <li>Installation: </li> </ul> <pre class="highlight shell"><code> npm install react-helmet </code></pre> </li> </ol> <ul> <li> Usage (Setting document head properties in a React component): <pre class="highlight jsx"><code> import React from 'react'; import { Helmet } from 'react-helmet'; const HeadExample = () => ( <div> <Helmet> <title>Page Title</title> <meta name="description" content="This is a description." /> </Helmet> <h1>Page Content</h1> </div> ); export default HeadExample; </code></pre> </li> </ul> <ol> <li> Using React Context API: <ul> <li>Usage (Creating a simple context in React): </li> </ul> <pre class="highlight jsx"><code> import React, { createContext, useContext } from 'react'; const MyContext = createContext(); const ParentComponent = () => ( <MyContext.Provider value={{ message: 'Hello from Context!' }}> <ChildComponent /> </MyContext.Provider> ); const ChildComponent = () => { const contextValue = useContext(MyContext); return <p>{contextValue.message}</p>; }; export default ParentComponent; </code></pre> </li> </ol> Feel free to explore these examples covering Web Workers in React, form handling, managing document head properties with React Helmet, and using the React Context API. Experiment with these concepts based on your application's needs. Certainly, let's continue exploring more topics with corresponding example code: <ol> <li> Debouncing and Throttling in React: <ul> <li>Usage (Implementing debouncing and throttling in a React component): </li> </ul> <pre class="highlight jsx"><code> import React, { useState } from 'react'; import { debounce, throttle } from 'lodash'; const DebounceThrottleExample = () => { const [value, setValue] = useState(''); const debouncedHandleChange = debounce((input) => { console.log('Debounced Input:', input); }, 1000); const throttledHandleChange = throttle((input) => { console.log('Throttled Input:', input); }, 1000); const handleChange = (e) => { setValue(e.target.value); debouncedHandleChange(e.target.value); throttledHandleChange(e.target.value); }; return ( <div> <input type="text" value={value} onChange={handleChange} /> </div> ); }; export default DebounceThrottleExample; </code></pre> </li> <li> Intersection Observer in React: <ul> <li>Usage (Using Intersection Observer in a React component): </li> </ul> <pre class="highlight jsx"><code> import React, { useEffect, useRef } from 'react'; const IntersectionObserverExample = () => { const targetRef = useRef(null); const handleIntersection = (entries) => { entries.forEach((entry) => { if (entry.isIntersecting) { console.log('Target is in view!'); } else { console.log('Target is out of view!'); } }); }; useEffect(() => { const observer = new IntersectionObserver(handleIntersection); observer.observe(targetRef.current); return () => { observer.disconnect(); }; }, []); return <div ref={targetRef}>Intersection Observer Target</div>; }; export default IntersectionObserverExample; </code></pre> </li> <li> Lazy Loading Images in React: <ul> <li>Usage (Implementing lazy loading of images in a React component): </li> </ul> <pre class="highlight jsx"><code> import React from 'react'; const LazyLoadingImage = () => ( <div style={{ height: '500px', overflowY: 'scroll' }}> <p>Scroll down to load the image</p> <img src="https://example.com/large-image.jpg" alt="Lazy Loaded Image" loading="lazy" /> </div> ); export default LazyLoadingImage; </code></pre> </li> <li> Memoization in React with useMemo: <ul> <li>Usage (Using <code>useMemo</code> for memoization in a React component): </li> </ul> <pre class="highlight jsx"><code> import React, { useState, useMemo } from 'react'; const MemoizationExample = () => { const [count, setCount] = useState(0); const squaredValue = useMemo(() => { console.log('Computing squared value...'); return count * count; }, [count]); return ( <div> <p>Count: {count}</p> <p>Squared Value: {squaredValue}</p> <button onClick={() => setCount(count + 1)}>Increment</button> </div> ); }; export default MemoizationExample; </code></pre> </li> </ol> Feel free to explore these examples covering debouncing and throttling, using Intersection Observer, lazy loading images, and memoization with <code>useMemo</code> in React. Adapt and experiment with these concepts based on your application's requirements.</div>

50 Terms using in React development

<div><ol> <li>React: A JavaScript library for building user interfaces, developed and maintained by Facebook. It facilitates the creation of reusable UI components.</li> <li>Redux: A state management library for JavaScript applications, often used in conjunction with React. Redux helps manage the state of an application in a predictable and centralized manner.</li> <li>Component: A modular, self-contained piece of code in React that encapsulates a specific functionality or UI element. Components can be reused throughout an application.</li> <li>Virtual DOM: An in-memory representation of the actual DOM in React. It improves performance by allowing React to update only the parts of the DOM that have changed.</li> <li>JSX: A syntax extension for JavaScript used with React to write XML-like code for creating React elements.</li> <li>Props: Short for properties, props are used to pass data from one component to another in React. They are immutable and are set by the parent component.</li> <li>State: An internal data storage mechanism in React components that allows them to keep track of changing information. Unlike props, state can be modified within a component.</li> <li>Lifecycle Methods: Methods in a React component that are invoked at different stages of its lifecycle, such as mounting, updating, and unmounting.</li> <li>React Router: A library that enables navigation and routing in React applications, allowing for the creation of Single Page Applications (SPAs).</li> <li>Hooks: Functions introduced in React 16.8 that allow functional components to use state and other React features without writing a class.</li> <li>Redux Store: The central hub where the state of a Redux application is stored. It is a single JavaScript object that represents the entire state tree.</li> <li>Reducer: A pure function in Redux that specifies how the application's state changes in response to actions. Reducers take the current state and an action and return a new state.</li> <li>Action: Plain JavaScript objects that describe changes in the application state. Actions must have a <code>type</code> property indicating the type of change.</li> <li>Dispatch: A method in Redux used to send actions to the Redux store. It is the only way to trigger a state change.</li> <li>Middleware: Functions that have access to the action being dispatched and the current state in Redux. Middleware can be used for logging, asynchronous actions, and other purposes.</li> <li>Immutable State: In Redux, the state should be treated as immutable, meaning it should not be directly modified. Instead, new copies of the state should be created.</li> <li>Provider: A React component provided by React Redux that makes the Redux store available to the rest of the application.</li> <li>Connect: A higher-order component provided by React Redux that connects a React component to the Redux store, allowing it to access the state and dispatch actions.</li> <li>Thunk: A middleware for Redux that allows the action creators to return functions instead of plain actions. Thunks are often used for handling asynchronous operations.</li> <li>Selectors: Functions in Redux that are used to extract specific pieces of information from the state. They help in keeping the component logic independent of the shape of the state.</li> <li>Higher-Order Component (HOC): A function that takes a component and returns a new component with additional props or behavior.</li> <li>Context API: A feature in React that allows data to be passed through the component tree without having to pass props manually at every level.</li> <li>CSS-in-JS: A technique where styles are defined directly within JavaScript files, often used in React applications for component-specific styling.</li> <li>Webpack: A popular module bundler for JavaScript applications. It is commonly used in React projects to bundle and optimize assets.</li> <li>Babel: A JavaScript compiler that converts ECMAScript 2015+ code into a backward-compatible version of JavaScript for older browsers.</li> <li>JSX Compiler: A tool that translates JSX code into JavaScript that browsers can understand. Babel is commonly used for this purpose in React projects.</li> <li>PropTypes: A library used in React for documenting and validating the types of props that a component should receive.</li> <li>React Fragment: A syntax in React used to group multiple elements without introducing an additional DOM node.</li> <li>Error Boundary: A React component that catches JavaScript errors anywhere in the component tree and logs those errors.</li> <li>CSS Modules: A way to locally scope CSS in React applications, preventing style conflicts between different components.</li> <li>Lazy Loading: A technique where components or assets are loaded only when they are actually needed, improving the initial load time of a React application.</li> <li>Code Splitting: The process of breaking down a large JavaScript bundle into smaller, more manageable chunks that can be loaded on demand.</li> <li>Server-Side Rendering (SSR): A technique where a React application is rendered on the server side and the generated HTML is sent to the client, improving initial page load performance.</li> <li>Client-Side Rendering (CSR): The traditional approach where a React application is rendered on the client side using JavaScript.</li> <li>Immutable.js: A library that provides immutable data structures, which can be used to enforce immutability in a Redux application.</li> <li>XHR Request: Stands for XMLHttpRequest, a feature in browsers that allows making HTTP requests from the client side.</li> <li>JWT (JSON Web Token): A compact, URL-safe means of representing claims to be transferred between two parties, commonly used for authentication in React applications.</li> <li>Firebase: A mobile and web application development platform by Google, often used with React for real-time database and authentication.</li> <li>GraphQL: A query language for APIs that allows clients to request only the data they need. It is an alternative to REST and is often used with React.</li> <li>PropTypes: A library used in React for documenting and validating the types of props that a component should receive.</li> <li>Serverless Architecture: An architectural approach where the server is abstracted away, and developers focus on writing functions that run in response to events.</li> <li>WebSocket: A communication protocol that provides full-duplex communication channels over a single, long-lived connection, often used for real-time features in React applications.</li> <li>Axios: A popular JavaScript library used for making HTTP requests in React applications.</li> <li>JWT (JSON Web Token): A compact, URL-safe means of representing claims to be transferred between two parties, commonly used for authentication in React applications.</li> <li>GraphQL: A query language for APIs that allows clients to request only the data they need. 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<div>Managing state in a React application is a common challenge, and when it comes to persisting that state across sessions, localStorage is a handy solution. In this post, we'll explore a custom React hook, <code>useSemiPersistentState</code>, that simplifies the process of storing and testing state in localStorage. <h2> The <code>useSemiPersistentState</code> Hook </h2> <div class="highlight js-code-highlight"> <pre class="highlight jsx"><code>import { useEffect, useState, Dispatch, SetStateAction } from "react"; const useSemiPersistentState = <T>( key: string, initialValue: T ): [T, Dispatch<SetStateAction<T>>] => { const [state, setState] = useState<T>(() => { try { const storedState = localStorage.getItem(key); return storedState ? JSON.parse(storedState) : initialValue; } catch (error) { // Handle parsing error, fallback to initial value console.error("Error parsing localStorage data:", error); return initialValue; } }); useEffect(() => { // Save the value to localStorage whenever it changes localStorage.setItem(key, JSON.stringify(state)); }, [key, state]); return [state, setState]; }; export { useSemiPersistentState }; </code></pre> </div> The <code>useSemiPersistentState</code> hook makes it easy to manage state in your React components while ensuring its persistence between page reloads. <h2> Usage and Example </h2> Let's consider a scenario where we want to persist the user's theme preference. Here's how you can use the hook: <div class="highlight js-code-highlight"> <pre class="highlight jsx"><code>import { useSemiPersistentState } from '<relative-path-to-your-hook-file>'; const ThemeSelector = () => { const [theme, setTheme] = useSemiPersistentState('theme', 'light'); const toggleTheme = () => { const newTheme = theme === 'light' ? 'dark' : 'light'; setTheme(newTheme); }; return ( <div> <p>Current Theme: {theme}</p> <button onClick={toggleTheme}>Toggle Theme</button> </div> ); }; export default ThemeSelector; </code></pre> </div> In this example, the <code>ThemeSelector</code> component effortlessly maintains the theme preference in <code>localStorage</code>, allowing the theme to persist across page reloads. <h2> Testing Made Simple </h2> Testing stateful components becomes easier with this hook. You can mock the <code>localStorage</code> object in your tests to simulate different scenarios and ensure that your components behave as expected. <h2> Conclusion </h2> The <code>useSemiPersistentState</code> hook provides an elegant solution for handling semi-persistent state in React applications. Whether you're building a theme switcher or saving user preferences, this hook simplifies the process and enhances the user experience.</div>

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DevIdiot! Weekly Newsletter Vol.9This is a post from the host of WebIdiot.Online. Welcome to the latest edition of our DevIdiot! newsletter.The content in this newsletter is meant to help you stay up-to-date on the latest trending articles on our website. If you find these resources helpful consider subscribing to our newsletter and get the latest content directly to your inbox each week.Latest Trending ArticlesForm validation in React is made simpler by using JavaScript librariesA Web developer

Form validation in React is made simpler by using JavaScript libraries

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