React.memo: Shallow Comparison, Not Render Lock

Need to interact directly with the DOM or persist mutable values across renders without triggering updates in React? That's where `useRef` shines. Unlike `useState`, `useRef` doesn't cause a re-render when its value changes. It returns a mutable ref object whose `.current` property can hold any value. This makes it ideal for accessing DOM elements, like programmatically focusing an input field, or storing a mutable value like a timer ID that shouldn't trigger UI updates. `useRef` is a powerful hook for managing imperative operations within your declarative React components, giving you direct access when needed. #React #ReactJS #JavaScript #WebDevelopment #Frontend #ReactHooks #Tech

Ever wondered why changing one small thing in React doesn’t re-render the entire UI? 🤔 That’s reconciliation. In React, every update creates a new virtual DOM. But instead of updating everything, React compares the new tree with the previous one - and updates only what changed. Sounds simple, but small mistakes can break performance. 😬 • Missing or unstable keys ➡️ unnecessary re-renders • Recreating objects/functions ➡️ diffing becomes expensive • Large component trees ➡️ slower updates React is fast. But only if we help it. Reconciliation is not magic - it’s an optimization strategy based on assumptions. Understanding it changes how you structure components. 😉 Have you ever fixed a performance issue just by adding proper keys or memoization? #reactjs #frontend #webperformance #javascript #learninginpublic

While developing a new feature, I ran into a specific need: map a path to a different location — without changing the URL in the browser. That's exactly what Next.js rewrites do. Instead of duplicating layouts or restructuring the whole feature, I just added a rewrites config directly in next.config.js The URL stays exactly what it needs to be. The layout stays in one place. Problem solved. #Nextjs #WebDevelopment #JavaScript #Frontend #React

💡 𝗧𝗶𝗽 𝗼𝗳 𝘁𝗵𝗲 𝗗𝗮𝘆 — 𝗥𝗲𝗮𝗰𝘁 𝗗𝗶𝗱 𝘆𝗼𝘂 𝗸𝗻𝗼𝘄? Every time a parent component re-renders, 𝗮𝗹𝗹 𝗼𝗳 𝗶𝘁𝘀 𝗰𝗵𝗶𝗹𝗱 𝗰𝗼𝗺𝗽𝗼𝗻𝗲𝗻𝘁𝘀 𝗿𝗲-𝗿𝗲𝗻𝗱𝗲𝗿 𝘁𝗼𝗼 by default. Even if the child’s props didn’t change. 🔧 𝗛𝗼𝘄 𝘁𝗼 𝗼𝗽𝘁𝗶𝗺𝗶𝘇𝗲: Wrap pure components with "React.memo" so they only re-render when their props actually change. This small optimization can significantly improve performance in large component trees. Smarter renders = faster UI. #React #ReactJS #FrontendDevelopment #JavaScript #WebDevelopment #PerformanceOptimization #SoftwareEngineering #CodingTips #FullstackDeveloper

💡 𝗧𝗶𝗽 𝗼𝗳 𝘁𝗵𝗲 𝗗𝗮𝘆 — 𝗥𝗲𝗮𝗰𝘁 𝗗𝗶𝗱 𝘆𝗼𝘂 𝗸𝗻𝗼𝘄? Every time a parent component re-renders, 𝗮𝗹𝗹 𝗼𝗳 𝗶𝘁𝘀 𝗰𝗵𝗶𝗹𝗱 𝗰𝗼𝗺𝗽𝗼𝗻𝗲𝗻𝘁𝘀 𝗿𝗲-𝗿𝗲𝗻𝗱𝗲𝗿 𝘁𝗼𝗼 by default. Even if the child’s props didn’t change. 🔧 𝗛𝗼𝘄 𝘁𝗼 𝗼𝗽𝘁𝗶𝗺𝗶𝘇𝗲: Wrap pure components with "React.memo" so they only re-render when their props actually change. This small optimization can significantly improve performance in large component trees. Smarter renders = faster UI. #React #ReactJS #FrontendDevelopment #JavaScript #WebDevelopment #PerformanceOptimization #SoftwareEngineering #CodingTips #FullstackDeveloper

Most developers use key in React just to fix warnings in lists. But key is actually a powerful control mechanism. Changing a component’s key forces React to completely remount it. Which means you can intentionally: • Reset form state • Restart animations • Clear internal component memory • Force reinitialization logic Instead of manually clearing 6 different states. Example: <Form key={userId} /> Switch userId → entire form resets cleanly. Sometimes the simplest tool is the most underrated one. What’s one React feature you think is underused? #reactjs #frontend #javascript

🚀Render Props in React! 🚀 Instead of hardcoding what a component renders, you pass a function as a prop and let the component call it. Simple idea. Powerful results. 💡 So, that's why I implemented a short example to show you how some component passes between a parent and another child component. Here is a link for it: https://lnkd.in/d5NqDjEK One component. Endless possibilities. #React #Frontend #WebDevelopment #JavaScript

Why does this log 1, not 2? Most people say: “Because React batches updates.” That’s only half the story. The real reason? Stale closures. Inside this render, count is 0. Both setCount(count + 1) calls use that same captured value. So React receives: 1) set to 1 2) set to 1 Not: 1) set to 1 2) set to 2 This question isn’t about memorizing hooks. It tests whether you understand how React renders create new function scopes — and how state updates are queued. #react #javascript #frontend

React Performance Mistakes That Slow Down Apps I often see these mistakes in many React projects: #1 unnecessary re-renders #2 heavy components #3 large bundles #4 no lazy loading #5 wrong useEffect usage Fixing these can drastically improve performance. What React performance mistake have you seen the most? #react #webdevelopment #javascript #frontend #reactjs

⚡ Lazy Loading in React — a quick visual breakdown → Before: 3.7 MB loaded on page open   → After: 405 KB loaded on page open   → Result: 4.3× faster First Contentful Paint 🚀  All of this with just 2 lines of code using React.lazy() + Suspense. This is a small but often underestimated concept that can significantly improve performance. Swipe to see the network panel & Lighthouse scores 👉  #ReactJS #WebPerformance #Frontend #JavaScript #React