React Components: Reusable UI Building Blocks

DAY 4 | WHY DOES REACT BREAK THE UI INTO COMPONENTS? 🧩 Earlier, the whole page was written as one big block. One small change → risk of breaking something else. React changed this idea. React says: 👉 break the UI into small, independent pieces. Each piece: 🔹 has its own logic 🔹 handles its own UI 🔹 doesn’t disturb others So instead of fixing a whole page, you fix only the part that matters. That’s why React apps are built with components, not pages. #ReactJS #FrontendDevelopment #WebDevelopment #JavaScript #LearnInPublic #CodingJourney #SoftwareEngineering

🚀 Day 17 | React.js Topic: Props Post:Passing Data in React Today, I learned how props work in React and how they help components communicate with each other. Props allow data to flow from parent to child components, making UI blocks dynamic, reusable, and easy to manage.Understanding props is a key step toward building scalable and well-structured React applications. #ReactJS #ReactProps #FrontendDevelopment #JavaScript #WebDevelopment #MERNStack #LearningInPublic #ReactDeveloper #UIComponents #CodeJourney #TechLearning #ModernWeb #DeveloperLife

 Diving Deep into React's Performance Optimization Just spent some time refactoring a complex component in React, focusing on memo, useCallback, and useMemo hooks to significantly boost performance. It's always fascinating to see the tangible difference these optimizations make in perceived load times and overall user fluidity! While building new features is exciting, ensuring a snappy, responsive UI is paramount for retaining users. Small gains in rendering efficiency across multiple components can lead to massive improvements in the overall application experience. What are your go-to strategies for optimizing React applications? Love to hear different approaches! #ReactJS #FrontendDeveloper #PerformanceOptimization #JavaScript #WebDev"

🔐 Password Generator using React.js 🚀 Just built a Password Generator using React.js while practicing core React hooks 💻✨ 🔧 What I used: useState → to manage password length & options useCallback → to optimize password generation Conditional logic → numbers & characters toggle 🎯 What this project taught me: Better understanding of state management How useCallback improves performance Writing cleaner & reusable logic Small projects like this make React concepts much clearer 🔥 Next step: adding copy-to-clipboard & UI improvements 🚀 #ReactJS #JavaScript #WebDevelopment #FrontendDeveloper #LearningReact #ReactHooks #PasswordGenerator #100DaysOfCode

DAY 3| WHY DO WE ALWAYS USE CONST FOR FUNCTIONS IN REACT? 🤔 If you look at React code, you’ll see this everywhere 👇 const handleClick = () => { console.log("Clicked"); }; In React, functions are not meant to change. Using const keeps: 👉 the function fixed 👉 behavior predictable 👉 UI updates stable That’s why this pattern shows up again and again in React code. 💬 If this helped you, share your thoughts. #ReactJS #JavaScript #FrontendDevelopment #WebDevelopment #LearnInPublic #CodingJourney #SoftwareEngineering

Re-render misconception Most devs think: React re-renders = React re-paints the whole DOM. Not true - React re-renders components - then compares Virtual DOM - updates only what changed in real DOM So re-render ≠ performance problem. Performance problem happens when: heavy computations run on each render unnecessary re-renders trigger expensive children Fix: useMemo, useCallback, React.memo split components properly Question: what was the biggest re-render performance issue you faced in React? #reactjs #javascript #frontend #webdevelopment #performance

JavaScript continues to prove why it's the undisputed king of the web. 👑 It’s hard to believe that what started as a simple scripting language for adding interactivity to web pages has evolved into the powerhouse that drives the entire modern web ecosystem. From running the frontend (React, Vue, Angular) to powering the backend (Node.js, Bun, Deno), and even venturing into mobile and desktop apps, JavaScript is everywhere. What makes it so enduring? * Versatility: One language, full-stack capabilities. * The Ecosystem: NPM is the largest software registry in the world. * Constant Evolution: Features like Async/Await, Optional Chaining, and ES Modules have made writing JS a joy. Whether you are a seasoned pro or just starting, betting on JavaScript is always a safe wager. What is your favorite modern JavaScript feature that you can't live without? #JavaScript #WebDevelopment #Coding #FullStack #TechTrends #SoftwareEngineering

Announcing React Zero-UI: global state with ZERO React re-renders. It pre-renders UI states at build time and flips data-* attributes. Tiny footprint (<350B), works with Tailwind, and offers a useUI hook that feels like useState. A fresh take on performant UI state. Check it out: https://lnkd.in/dXmHh2tu #ReactJS #WebDev #Frontend #JavaScript

One important performance concept in React is Batch Update. Batch updating means React groups multiple state updates into a single render, instead of re-rendering the UI after every individual update. 𝗪𝗵𝘆 𝗯𝗮𝘁𝗰𝗵𝗶𝗻𝗴 𝗶𝘀 𝗻𝗲𝗲𝗱𝗲𝗱 Updating the DOM is expensive. If React re-rendered after every setState call, even small interactions would feel slow. Batch updates solve this by:  • Collecting multiple state changes  • Triggering one reconciliation + one render  • Updating the DOM only once 𝗘𝘅𝗮𝗺𝗽𝗹𝗲: setCount(count + 1); setTotal(total + 1); Here, Without batching, 2 renders and with batching, only one render 𝗞𝗲𝘆 𝘁𝗮𝗸𝗲𝗮𝘄𝗮𝘆 Batch updates are a core optimization strategy that helps React scale efficiently and understanding batching helps you write predictable, high-performance React code. #ReactJS #BatchUpdates #WebPerformance #FrontendDevelopment #JavaScript #ReactInternals #SoftwareEngineering #TechEducation

Today I finally understood how React works behind the scenes, and it made everything click: 🔹 Virtual DOM keeps a lightweight UI copy 🔹 Reconciliation compares changes efficiently 🔹 Fiber schedules and prioritizes rendering work 🔹 React DOM updates only the required parts of the real DOM 📌 Key takeaway: React doesn’t re-render the whole page — it calculates minimal changes and updates only what’s needed, making apps fast and smooth. Understanding the fundamentals makes React feel less like magic and more like logic 💙 #ReactJS #FrontendDevelopment #LearningInPublic #JavaScript #Hitesh Choudhary