JAYAKUMAR K’s Post

🔥 I used to think React worked like this… 👉 “You change something… and the whole page re-renders.” That was my mental model for a long time. And honestly… it made React feel unpredictable. Then I learned what actually happens. ⚛️ React does NOT re-render everything When state changes, React does NOT rebuild the entire UI. Instead: It creates a new Virtual DOM snapshot Compares it with the previous one Detects ONLY what changed Updates just those parts in the real DOM 💡 So what’s actually happening? ❌ Not: “everything re-renders” ✔ But: “React calculates the difference and patches only what changed” 🧠 The mindset shift This changed how I write React code completely. Now I stop thinking in terms of: 👉 “What re-renders?” And start thinking: 👉 “What actually changes?” 🚀 Why this matters Because performance issues in React usually don’t come from React itself… They come from misunderstanding the rendering model. 🧩 Once this clicks, React stops feeling like magic and starts feeling like a system you can control. Have you ever had a React concept you used for months… before finally realizing how it actually works? #React #JavaScript #Frontend #WebDevelopment #CleanCode

import React from 'react'; Feels like just a line. But that one line can quietly pull in ~100kb - 1mb of bundle size …and all that JavaScript your browser now has to, download, parse, and execute. It introduces layers—abstractions, dependencies, and more JavaScript to the browser. And before you realize it, your “simple project” has grown into hundreds of KBs… sometimes MBs. React isn’t heavy. It just makes it very easy to be careless. If your project truly doesn’t need complex state, routing, or heavy UI logic—why start there? Frameworks like Petite Vue or Alpine.js let you add interactivity without committing to an entire ecosystem. Or if you like JSX (like I do), Preact would do just fine. Just this one decision—choosing simplicity over overengineering— could save you in costs, and probably users you’d otherwise lose to slow load times. And remember, React exists because Facebook had a problem, and you probably don’t have it yet. #WebDevelopment #Frontend #JavaScript #ReactJS #SoftwareEngineering

Still downloading icons as images and then using them in your projects? That usually means you're missing out on modern frontend development practices. In today’s React / Next.js ecosystem, we don’t rely on image-based icons anymore. Instead, we use modern icon libraries like lucide-react, where icons are directly imported as components: import { Mail, Lock, User } from "lucide-react"; This approach makes your code: ✔ cleaner ✔ faster ✔ easier to maintain ✔ optimized through tree-shaking Small modern practices like this separate a beginner setup from a production-level frontend workflow. #ReactJS #NextJS #FrontendDevelopment #LucideReact #WebDevelopment

Everyone says use React.lazy. Here's when it actually makes things worse. React.lazy splits your bundle. That sounds good on paper. But there's a hidden cost: → Waterfalls → Layout shift → Spinner hell on fast connections I've seen apps where lazy-loading a modal added 400ms of perceived lag — on a 100ms network. Why? Because the component fetch only starts when the user triggers it. By then it's already too late. 𝗧𝗵𝗲 𝗳𝗶𝘅 𝗶𝘀𝗻'𝘁 𝘁𝗼 𝘀𝘁𝗼𝗽 𝘂𝘀𝗶𝗻𝗴 𝗥𝗲𝗮𝗰𝘁.𝗹𝗮𝘇𝘆. 𝗜𝘁'𝘀 𝘁𝗼 𝗸𝗻𝗼𝘄 𝘄𝗵𝗲𝗻 𝘁𝗼 𝗽𝗿𝗲𝗳𝗲𝘁𝗰𝗵. Call your import() on onMouseEnter — not on render. The chunk loads in the ~200ms before the click lands. By the time the modal opens, it's already there. If a user is likely to click something within 3 seconds of landing on a page — don't lazy load it. Preload it instead. React.lazy is a network tool. Treat it like one. What did you lazy-load that you later regretted? #ReactJS #Frontend #WebPerformance #JavaScript #WebDev

Ever clicked two dropdowns and both stayed open at the same time? 😾 Looks unprofessional. Feels broken. Users hate it. Here is how I fixed it in React with just 2 lines : 👉 When Explore opens → force "Degree" dropdown to close onClick={() => {  setIsExploreMenuOpen(!isExploreMenuOpen);  setIsDegreeMenuOpen(false); // ← this one line does it }} 👉 When Degree opens → force "Explore" dropdown to close onClick={() => {  setIsDegreeMenuOpen(!isDegreeMenuOpen);  setIsExploreMenuOpen(false); // ← same idea }} The logic is simple: When you open something → explicitly close everything else. React does not do this automatically. You have to tell it exactly what to close. Small detail. Big difference in user experience. #react #nextjs #javascript #webdevelopment #tailwindcss #buildinpublic #frontenddevelopment

✨ 𝗗𝗮𝘆 𝟰 𝗼𝗳 𝗠𝘆 𝗥𝗲𝗮𝗰𝘁 𝗝𝗼𝘂𝗿𝗻𝗲𝘆 ⚛️🚀 Today I learned about the `𝘂𝘀𝗲𝗘𝗳𝗳𝗲𝗰𝘁` 𝗵𝗼𝗼𝗸, and more importantly, 𝘄𝗵𝘆 𝘄𝗲 𝗮𝗰𝘁𝘂𝗮𝗹𝗹𝘆 𝗻𝗲𝗲𝗱 𝗶𝘁. While working with React, I noticed that components are mainly for rendering UI. But sometimes we need to do things outside rendering — like fetching data, setting up timers, or updating something after the UI changes. That’s where `𝘂𝘀𝗲𝗘𝗳𝗳𝗲𝗰𝘁` comes in. It lets us handle these 𝘀𝗶𝗱𝗲 𝗲𝗳𝗳𝗲𝗰𝘁𝘀 in a clean and controlled way. What I found interesting is how it runs after render and can depend on specific values. Instead of mixing everything together, React separates 𝗨𝗜 𝗹𝗼𝗴𝗶𝗰 from 𝘀𝗶𝗱𝗲 𝗲𝗳𝗳𝗲𝗰𝘁𝘀, which makes the code easier to understand and manage. Starting to see how React keeps things structured as apps grow 💻⚡ #ReactJS #JavaScript #WebDevelopment #LearningJourney #FrontendDevelopment

🚀 Ever wondered what really happens behind the scenes in React? We’ve published a deep-dive guide that breaks down how React works internally beyond just components and props. From the Virtual DOM to the reconciliation algorithm, and from the powerful Fiber architecture to rendering phases and hooks, this blog explains how React efficiently updates the UI while keeping performance optimized. Whether you're building scalable applications or looking to strengthen your fundamentals, this guide offers clear, real-world insights into React’s core mechanics. 💡 Learn how React makes smart decisions to update only what’s necessary and why it matters for your applications. 👉 Read the full blog by Sachin Saxena and level up your React expertise: https://lnkd.in/gzTQaAj3 #ReactJS #WebDevelopment #Frontend #JavaScript #SoftwareEngineering #Performance #TechBlog

After spending an afternoon with Next.js 14, I noticed how much smoother frontend work can be. The new advanced server components really cut down the usual data fetching headaches in React. Routing updates make nested layouts easier to manage—a relief since it felt clunky before. Image optimization loads pages faster without extra effort. I tried it out with Vercel and Playwright for testing, and both tools felt more seamless than usual. If you work with React and Next.js and want to speed up your development, this update is worth checking out. Has anyone swapped Cypress or Copilot into their Next.js 14 projects yet? #Nextjs #ReactJS #FrontendDevelopment #WebDevelopment #ServerComponent

I learnt a lot doing this project. Understood the use of React like never before and how certain features are utilized. Features: -> Drag-and-drop tasks across the Todo, Working, Completed columns using a React Library -> Add, edit, and view tasks with modals -> State management using React Context -> Persistent tasks with localStorage -> Learned advanced React hooks, context, and dynamic UI handling This project helped me level up my React skills and understand interactive, state-driven UIs. React Todo Website: https://lnkd.in/eXKm3Hqn Check it out on GitHub: https://lnkd.in/exiv6Tpv #ReactJS #Frontend #WebDevelopment #UIUX #TodoApp #JavaScript

A 1-second delay in page load time can cost you 7% in conversions. 📉 In the world of React, we often get excited about building features and forget the weight we’re adding to the initial bundle. Shipping a 2.5MB file to a user on a 3G network is a recipe for a high bounce rate. 🐌 The "Why": Users don't need to load your 'Admin Settings' or 'Data Heavy Charts' the moment they land on the landing page. The "When": * Routes: Split your main pages. Modals/Widgets: Load them only when triggered. Heavy Libraries: Lazy load components that use large third-party packages. By using React.lazy() and Suspense, you aren't just writing better code; you’re building a better business. 🚀 #ReactJS #WebPerformance #FrontendDevelopment #JavaScript #CodingTips