How to Stop Unnecessary Re-renders in React with useCallback and useMemo

⚛️ Ever wondered how React updates your screen so fast — even when you hit setState() hundreds of times? Every time you call setState(), React quietly rebuilds your UI — but instead of repainting everything, it compares two blueprints (Virtual DOMs), finds what changed, and updates just that piece. That detective work is Reconciliation, powered by React Fiber. It’s why React feels fast — not because it does more, but because it updates less. ⚡ #ReactJS #Frontend #JavaScript #LearningInPublic #WebDev #SoftwareEngineering

Your UI feels laggy, but no errors. You open React DevTools and suddenly, you see dozens of re-renders. Most of them? Completely unnecessary. This usually happens when: ⚡ State is lifted too high ⚡ Inline functions cause new references every render ⚡ Components aren’t memoized ⚡ Dependency arrays are incomplete or incorrect A few smart fixes like React.memo, useCallback, useMemo, and splitting components logically — can dramatically improve performance. Frontend performance isn’t just about network speed it’s render discipline. What’s your go-to trick to prevent unnecessary re-renders? #ReactJS #Nextjs #WebDevelopment #FrontendPerformance #ReactTips #CleanCode #JavaScript #FrontendEngineer #WebOptimization #CodingBestPractices #PerformanceMatters #ReactDev

⚛️ Batched State Updates Ever wondered why multiple setState calls don’t cause multiple re-renders? That’s React’s batched state updates — a mechanism that groups several state changes into a single render cycle. 💡 Why it matters: Prevents unnecessary renders. Boosts performance. Keeps UI consistent during rapid state changes. ⚠️ Watch out: Batched updates mean setState is asynchronous — your updated value isn’t available immediately after calling it. Use functional updates (setCount(prev => prev + 1)) to stay safe. Mastering React means understanding not just what re-renders — but when and why it does. #ReactJS #Frontend #Performance #JavaScript #WebDevelopment

⚡ Day 7 of #100DaysOfReact 🧠 Question: What is React? React is a JavaScript library for building user interfaces, created by Meta (Facebook). It helps developers build fast, dynamic, and reusable UI components — instead of reloading the whole page every time something changes. ⚙️ In simple words: React = “Divide your UI into small pieces, make them smart, and reuse them anywhere.” 🔥 Why developers love it: Super fast ⚡ (thanks to the Virtual DOM) Reusable components 🧩 Easy to manage large projects 💬 Your turn: When did you first hear about React — and what’s the feature that impressed you most? #ReactJS #FrontendDevelopment #100DaysOfReact #WebDevelopment #JavaScript

🧠 STATE = The Brain of Every React Component Most beginners struggle to really understand useState(). So I broke it down visually — simple, practical, and beginner-friendly. Here’s what you’ll learn in this carousel 👇 ✅ What state actually means in React ⚡ Why it makes your UI dynamic 💡 How useState works behind the scenes 🚫 What NOT to do when updating state Save this post 💾 and read it again after your next React project — you’ll see how powerful state really is. 👇 Tell me in comments — should I make the next one on useEffect or props? #React #JavaScript #Frontend #WebDevelopment #useState #CodingCommunity #DevLearning #ReactJS #100DaysOfCode #DeveloperTips

𝐒𝐭𝐚𝐭𝐞 𝐚𝐬 𝐚 𝐒𝐧𝐚𝐩𝐬𝐡𝐨𝐭: Most developers use useState every day… but very few truly understand what happens behind the scenes. React doesn’t simply “change a value.” There’s a deeper concept that makes React predictable and consistent. In React, state isn’t a live variable. Instead, on every render, React creates a snapshot of the state... and the entire UI is rendered from that snapshot. During a single render, the state never changes. If something updates → React generates a new snapshot → then re-renders the UI. Understanding this mindset makes React much clearer, more reliable, and easier to reason about. #WebDeveloper #React #Javascript #FrontEndDevelopment #WebDesign

⚛️ React Just Made Form Actions So Much Cleaner The new useActionState hook is a game-changer for handling async form submissions. No more juggling useState, useEffect, or endless try/catch blocks. 🙌 Here’s how it works 👇 🧩 You provide: A form action (e.g., addToCart) An initial state And React gives you back: 1️⃣ The latest state (like a message or result) 2️⃣ A wrapped form action (formAction) 3️⃣ A flag showing if it’s still running (isPending) This means your form logic becomes simpler, more declarative, and much easier to read. Just write the action, hook it up, and React handles the rest. A small API — but it makes a big difference for building clean, async-ready UIs. ⚡ 💬 Have you tried useActionState yet? What do you think about React’s new declarative direction? #ReactJS #JavaScript #WebDevelopment #Frontend #ReactHooks #CleanCode Dhruv Patel (Borad)

Is React Getting Too Complicated? React introduced another hook: useEffectEvent() in v19.2. But do we really need it? Or are we just patching complexity with more complexity? React is still incredibly powerful. But if you're building a simple UI, you shouldn't need a "PhD" in hooks to avoid stale closures. 🔹 We got useEffect to simplify side effects. 🔹 Then we added useCallback, useMemo, and useRef to fix its pain points. 🔹 Now we’re adding useEffectEvent… to fix the problems created by useEffect. See the pattern? It feels like every new hook solves a problem introduced by the last one. 💬 Would love to hear: Are you embracing these new hooks — or looking at other frameworks (like Svelte or Solid) for simplicity? #ReactJS #JavaScript #WebDevelopment #Frontend #useEffectEvent #React19 #DeveloperExperience #Opinion #WebDev

💠 Portal in React Portal is a way to render a component’s child elements outside of its parent DOM hierarchy while keeping the React component tree intact. 🔹 Why Do We Need Portals? React components render inside their parent element. But for elements like: Modals / Popups Tooltips Dropdown menus Notification it’s better to render them outside the main component tree. 🔹 Advantages of Portals 🔸 Solve z-index & overflow issues 🔸 Keep code modular and reusable 🔸 Maintain React’s state and event flow 🔸 Ideal for modals, alerts, or dropdowns #ReactJS #WebDevelopment #Frontend #ReactPortals #UIDesign #JavaScript #ReactTips 

The Silent Villain: Unoptimized Images You can write the cleanest React code ever but one 2MB image can ruin your entire Lighthouse score. Most performance issues don’t come from bad code… they come from assets we forget to optimize. Next.js gives us tools <Image />, automatic resizing, and modern formats like WebP/AVIF — but many devs still drag and drop raw, heavy files straight from Figma. Optimization isn’t about perfection it’s about respecting your user’s bandwidth and time. Because sometimes, the real bug isn’t in your code it’s in your images. How do you handle image optimization in your Next.js projects? #Nextjs #ReactJS #WebPerformance #FrontendOptimization #WebDevelopment #CleanCode #FrontendEngineer #PerformanceMatters #JavaScript #CodingTips #DeveloperMindset #WebDev