How React Simplifies DOM Updates

🎨 React Fundamentals and Components (#MERN_05 in series) Master React.js essentials and build dynamic, interactive user interfaces for your MERN stack applications. 💡 What You’ll Learn ● React essentials for MERN development ● JSX syntax and embedding expressions ● Functional components and props ● useState and event handling ⚙️ Key Highlights 💻 Build reusable and dynamic components 🎨 Create clean UIs with Tailwind CSS 🔄 Manage state and props effectively 🚀 Foundation for React Hooks and advanced concepts Start building smarter UIs today 👇 🔗 https://lnkd.in/g_fS9k6U #MERNStack #ReactJS #WebDevelopment #Frontend #JavaScript #FullStack #Coding #LearnToCode #NodeJS #ExpressJS #TailwindCSS

ReactJS Is just JavaScript Heard "React is just JavaScript" but it never clicked for you? Let's fix that. You know the basics: 1. index.html (your structure) 2. script.js (your brain) Vanilla JS: html <div id="app"></div> <script> const container = document.getElementById('app'); container.innerHTML = `<h1>Hello, Alex!</h1>`; </script> You're manually injecting HTML. It works, but it gets messy fast. React's approach: html <div id="container"></div> <script type="text/babel"> function App() { return <h1>Hello, Alex!</h1>; } const root = ReactDOM.createRoot(container); root.render(<App />); </script> See the shift? · Vanilla JS: You're manually updating the DOM · React: You describe WHAT you want, React handles HOW It's the same goal - just handing your blueprint to a dedicated construction crew instead of building everything yourself. That's it. React = JavaScript with better organization for complex UIs. #ReactJS #JavaScript #WebDevelopment #Frontend

𝗡𝗲𝘄 𝗝𝗦𝗫 𝘁𝗿𝗮𝗻𝘀𝗳𝗼𝗿𝗺 🙂 Have you ever encountered the problem Uncaught ReferenceError: React is not defined? 😯 1. The necessity of importing React in your components, even when not explicitly using React.createElement or other React APIs, stems from how JSX was historically transformed into JavaScript. 2. Before React17, JSX was transformed by Babel (or other transpilers) into React.createElement() calls. 3. Therefore, the React object needed to be in scope for these React.createElement() calls to work, hence the mandatory import React from 'react';. 4. React 17 introduced a new JSX transform. 5. This new transform allows transpilers to convert JSX directly into optimized JavaScript code without relying on React.createElement(). 6. This means that React itself no longer needs to be explicitly imported at the top of every file containing JSX, as the necessary functions are handled by the build tool. 7. While create react app, Next js, Vite support new JSX transform, but if you have set up the project manually, like manual Babel setup, then follow the below steps to do the magic: 🪜 a. update to the latest Babel and plugin transform.   If you are using @babel/plugin-transform-react-jsx:   # for npm users   npm update @babel/core @babel/plugin-transform-react-jsx b. If you are using @babel/preset-react:   # for npm users   npm update @babel/core @babel/preset-react c. To enable the new transform, pass {"runtime": "automatic"} as an option to @babel/plugin-transform-react-jsx or @babel/preset-react. 𝗩𝗼𝗶𝗹𝗮!!! 𝗬𝗼𝘂'𝗿𝗲 𝗿𝗲𝗮𝗱𝘆 𝘄𝗶𝘁𝗵 𝘁𝗵𝗲 𝗻𝗲𝘄 𝗝𝗦𝗫 𝘁𝗿𝗮𝗻𝘀𝗳𝗼𝗿𝗺 𝗻𝗼 𝗻𝗲𝗲𝗱 𝘁𝗼 𝗶𝗺𝗽𝗼𝗿𝘁 𝗿𝗲𝗮𝗰𝘁 𝗶𝗻 𝘆𝗼𝘂𝗿 𝗲𝘃𝗲𝗿𝘆 𝗝𝗦𝗫 𝗰𝗼𝗺𝗽𝗼𝗻𝗲𝗻𝘁. 👏

If quality still feels slow, you will love this. Our new deep dive on unit testing for JavaScript apps outlines 21 proven wins, a quick Jest setup, and patterns that scale across teams. We cover AAA, mocks, coverage gates, CI speed, and how testing supports performance work like image compression and caching. There is also an infographic style pyramid visual to share in standups. Read, apply, and ship with confidence. Full post: https://lnkd.in/d4h6uk2m #JavaScript #UnitTesting #TestingStrategy #Jest #SoftwareEngineering

10 JavaScript libraries you can safely move on from in 2025 Many developers still stick to old tools, “If it works, don’t touch it.” But in 2025, that mindset can hold you back. Outdated libraries slow down your projects, add unnecessary weight, and prevent you from using modern JS features. Here are 10 libraries it’s time to let go of 1 jQuery - native JavaScript already covers everything it used to do. 🔁 Use instead: Vanilla JS, React, Vue, Angular. 2 Lodash - most of its utilities now exist in ES6+. 🔁 Use instead: built-in methods like map, reduce, filter. 3 Moment.js - heavy and outdated. 🔁 Use instead: date-fns, Luxon, or Temporal API. 4 RequireJS - AMD modules are history. 🔁 Use instead: ES modules, Webpack. 5 Backbone.js - too manual, lacks modern data binding. 🔁 Use instead: React, Vue, Angular. 6 Modernizr - once useful for feature detection, now redundant. 🔁 Use instead: Babel and polyfills. 7 MooTools - elegant, but long abandoned. 🔁 Use instead: modern JS or frameworks like React/Vue. 8 Script.aculo.us - great in 2010, not so much today. 🔁 Use instead: GreenSock (GSAP), Anime.js. 9 Underscore.js - the “Swiss Army knife” of the past. 🔁 Use instead: pure ES6+. 10 Axios - still good, but Fetch API now does more with less. 🔁 Use instead: native fetch() with streaming and cancelation support. Takeaway: Switching to modern tools isn’t about chasing trends, it’s about writing faster, cleaner, and more efficient code. What old libraries have you recently let go of? #JavaScript #WebDevelopment #Frontend #CodingTrends #SoftwareEngineering #JS2025 #ModernWeb #CleanCode #React #Vue #Angular #WebPerformance #Developers

The Top "Contrarian" JavaScript Frameworks Every Friday morning, some junior developer trying to get noticed drops yet another “Top JavaScript Frameworks” list. Same line-up every time: Angular, React, Vue, Svelte, maybe Solid if they’re feeling bold. It’s like Groundhog Day for frontend devs. So let’s break the loop, shall we? Here are three frameworks/UI libraries that don’t quite play by the rules. Each one does things in a surprisingly different way that's worth a note. To run a comparison, we’ll pick a random UI task and see what their approach is like: let's create two buttons that, when both clicked, enable a third one. Some people believe HTMX is here to kill JavaScript, but what it really wants is to stop you writing it. Instead of functions and event listeners, you describe behaviour directly in your HTML using attributes like hx-get, hx-trigger, and hx-swap. It lets HTML talk to your backend — no scripts, no build tools, just markup that acts. Here’s how the same two-buttons-unlock-third example would look in HTMX’s https://lnkd.in/gfRUrsiu

The Top "Contrarian" JavaScript Frameworks Every Friday morning, some junior developer trying to get noticed drops yet another “Top JavaScript Frameworks” list. Same line-up every time: Angular, React, Vue, Svelte, maybe Solid if they’re feeling bold. It’s like Groundhog Day for frontend devs. So let’s break the loop, shall we? Here are three frameworks/UI libraries that don’t quite play by the rules. Each one does things in a surprisingly different way that's worth a note. To run a comparison, we’ll pick a random UI task and see what their approach is like: let's create two buttons that, when both clicked, enable a third one. Some people believe HTMX is here to kill JavaScript, but what it really wants is to stop you writing it. Instead of functions and event listeners, you describe behaviour directly in your HTML using attributes like hx-get, hx-trigger, and hx-swap. It lets HTML talk to your backend — no scripts, no build tools, just markup that acts. Here’s how the same two-buttons-unlock-third example would look in HTMX’s https://lnkd.in/gfRUrsiu

🧹 Clean Code Alert: Ditch the For Loop, Embrace .filter() Still using for loops to filter arrays? 😅 You’re writing more code than you need — and missing out on readability & performance. Instead of this: const activeUsers = []; for (let i = 0; i < users.length; i++) { if (users[i].active === true) { activeUsers.push(users[i]); } } ✅ Use .filter() — clean, declarative, and powerful: const activeUsers = users.filter(user => user.active); ✨ Why it wins: ✍️ Less code → fewer bugs 📖 More readable → easier to understand intent ⚡️ Functional style → better for modern JS/TS apps 🔁 Works perfectly in React, Vue, Angular, Next.js, etc. — 👉 Follow me for more tips on filter, map, reduce, and other essential JS array methods — plus real-world examples in React, Next.js, Vue, Angular, and beyond! — Looking to collaborate? I’m passionate about clean, efficient JavaScript and always open to connecting with fellow devs or exploring new project opportunities. Let’s build something amazing together! 🤝 #JavaScript #ReactJS #NextJS #VueJS #Angular #NuxtJS #Svelte #WebDevelopment #FrontendDevelopment #DeveloperTips #CodeQuality #CleanCode #FilterFunction #MapFunction #ArrayMethods #JavaScriptTips #Programming #TechTips #SoftwareEngineering #DeveloperCommunity #CodingLife #JSDev #FrontendDev #OpenToCollaboration #TechPartnership #LearnToCode #JavaScriptFramework #ReactDeveloper #VueDeveloper #AngularDeveloper #NuxtDeveloper #SvelteDeveloper #WebApps

👉 What is code splitting in JavaScript/Webpack, and how can we use it in React? 📌 Answer: Code splitting is the process of splitting JavaScript bundles into smaller chunks so the browser loads only the required code instead of everything at once. This makes apps load faster and improves performance. ⚡ In Webpack: -Dynamic Imports (import()) → Load modules only when needed. -SplitChunksPlugin → Extract common dependencies. -Multiple Entry Points → Create separate bundles. ⚛️ In React: React provides React.lazy + Suspense for component-level code splitting. Example: const Profile = React.lazy(() => import('./Profile')); <Suspense fallback={<div>Loading...</div>}> <Profile /> </Suspense> #FrontendInterview #JavaScript #ReactJS #Webpack #CodeSplitting #WebPerformance #LazyLoading #FrontendDeveloper #TechInterviews

🌟 Understanding Functional Components in React! ⚛️ In React, Functional Components are the simplest and most widely used way to build UI elements. They’re written as JavaScript functions and return JSX to describe what the UI should look like. 💡 Why Functional Components? 🧠 Easy to read and write — just a function returning JSX. ⚡ Better performance and less boilerplate than class components. 🧩 Perfectly supports React Hooks (useState, useEffect, etc.) for state and lifecycle management. 🔄 Encourages a modular and reusable code structure. example 👇 import React, { useState } from "react"; function Welcome() { const [name, setName] = useState("Bhargavi"); return ( <div> <h2>Hello, {name} </h2> <input type="text" value={name} onChange={(e) => setName(e.target.value)} placeholder="Enter your name" /> </div> ); } export default Welcome; One of the exciting things about functional components is how easily they integrate with API data. For example, you can fetch a list of products, users, or posts from an API and dynamically display them in your UI — all in a clean and reactive way. Functional components make building modern, data-driven applications simpler and more efficient. They are concise, maintainable, and a cornerstone of modern React development. 10000 Coders Meghana M #React #JavaScript #WebDevelopment #Frontend #FunctionalComponents #ReactJS #CodingJourney #LearningEveryday