React State Updates: Batching and Function Closures

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

Today I want to share an amazing React feature that many developers don't know about. It allows you to create components using a class instead of a function. This gives you access to powerful tools like lifecycle methods, this.state, and this.setState(). 2026 is the new 2016 🤣 #React #JavaScript #Frontend #WebDevelopment #SoftwareEngineering

🚀 𝗧𝗿𝗲𝗲 𝗦𝗵𝗮𝗸𝗶𝗻𝗴 𝗶𝗻 𝗥𝗲𝗮𝗰𝘁 / 𝗝𝗦 🌳✨ Tree Shaking is a bundling technique that removes unused code from your final build. ✅ Smaller bundle size ✅ Faster load time ✅ Better performance 💡 Works best with 𝗘𝗦𝟲 𝗶𝗺𝗽𝗼𝗿𝘁𝘀/𝗲𝘅𝗽𝗼𝗿𝘁𝘀. Example: 𝘪𝘮𝘱𝘰𝘳𝘵 { 𝘥𝘦𝘣𝘰𝘶𝘯𝘤𝘦 } 𝘧𝘳𝘰𝘮 "𝘭𝘰𝘥𝘢𝘴𝘩"; #ReactJS #JavaScript #Frontend #Performance #WebDevelopment

🚀 Stale Closures Why does state inside setTimeout show old values? Functions capture variables at creation time. If state changes later, the timeout still holds old reference. In OTP flows or retry logic, this creates incorrect behavior. Use functional updates or refs when dealing with async callbacks. #ReactJS #JavaScript #AsyncProgramming #Frontend

Built a Password Generator using React while learning React Hooks in depth. Worked with useState, useEffect, useCallback, and useRef to understand state management, DOM access, and performance optimization in a practical way. #ReactJS #WebDevelopment #Frontend #LearningInPublic #JavaScript

4 Smart Ways to Manage Conditional Rendering in React! Here’s a clear and practical overview of popular approaches to conditional rendering in React: ✅ If-Else – Straightforward and traditional ✅ Ternary Operator – Clean inline decision-making ✅ Logical && – Concise short-circuit rendering ✅ Switch-Case – Perfect for handling multiple states Swipe 👉 to explore each approach and choose what fits your use case best! Which approach do you prefer? Drop your answer below! ⬇️ #ReactJS #WebDevelopment #Frontend #CodingTips #JavaScript

Most performance issues come down to one thing: Unnecessary Re-renders. React is fast, but it’s not magic. If you don't manage how and when your components update, your DOM will pay the price. In this carousel, I break down: The 4 core triggers of a re-render. The 'Waterfall Effect' in parent-child relationships. How to stabilize your code using professional patterns." #ReactJS #WebDevelopment #JavaScript #FrontendPerformance #MERNStack #ReactHooks #ZhairAhmad #SoftwareEngineering

Custom hooks help you extract reusable logic, keep your components clean, and simplify state management. They’re perfect for making your React code more organized and maintainable. Benefits: Reuse logic across components Avoid repetition Simplify complex logic Improve consistency 💡 Pro Tip: Start with small hooks for common patterns—it saves time and makes your projects scalable! #ReactJS #CustomHooks #WebDevelopment #Frontend #JavaScript #CleanCode

🚀 React Re-renders Why does a component re-render even when props look the same? React re-renders when reference changes, not value. If you pass new objects/functions every render, React treats them as new. Example: Passing `{ user }` where `user` is recreated each render will trigger child updates. In dashboards with 100+ rows, this causes lag. Fix: Memoize values and avoid inline object creation. #ReactJS #FrontendEngineering #JavaScript

React Performance isn’t about adding hooks everywhere. It’s about adding them where they matter. Most applications suffer from unnecessary re-renders and unstable references. Two small hooks. Massive impact: 1. useCallback → Stabilize function references 2. useMemo → Avoid expensive recalculations But misuse them, and you just add complexity with zero gains #ReactJS #NextJS #FrontendDevelopment #WebPerformance #JavaScript #SoftwareEngineering #ReactPerformance #Optimization #CleanCode #TechLeadership #UIDevelopment #ProgrammingTips