MD Mustafa Hossain’s Post

I Stopped Using So Many Libraries in React Native… And My App Got Better Sounds weird, right? At one point, my app had a library for everything: Navigation → library Forms → library Animations → library State → multiple libraries It felt “professional”… But here’s what actually happened: ❌ App size increased ❌ More bugs after updates ❌ Dependency conflicts ❌ Harder to debug issues So I tried something different: 👉 I removed as many libraries as I could. And the result? ✔ Smaller app size ✔ Better performance ✔ Cleaner codebase ✔ Easier debugging Now I follow one simple rule: “If I can build it simply… I don’t install it.” Don’t get me wrong, libraries are powerful. But too many of them can silently kill your app’s performance and maintainability. Sometimes, less really is more. Curious to know 👇 What’s one library you think every React Native developer should avoid (or must use)? React Native, Mobile Development, App Optimization, Clean Code, Dependency Management, JavaScript, Cross Platform Apps, Performance Optimization, Software Engineering #ReactNative #MobileDevelopment #CleanCode #AppDevelopment #JavaScript #SoftwareEngineering #Developers #Programming #Tech #Coding #DevCommunity #Optimization #BuildInPublic #FrontendDev

🚧 Learning React: Error Boundaries (and something unexpected…) While practicing React, I built a simple component that intentionally crashes: const BuggyComponent = () => { throw new Error("I crashed!"); }; 💥 Result? The entire app crashed. That made me think: 👉 In real apps, should one component break everything? 🛠️ Then I discovered Error Boundaries I wrapped the crashing component like this: <ErrorBoundary> <BuggyComponent /> </ErrorBoundary> Now instead of crashing: ✅ Only that part fails ✅ A fallback UI is shown ✅ The rest of the app still works 🤯 But here’s what confused me… I’ve been using functional components + hooks everywhere So why is this still a class component? After digging deeper: 1. Error Boundaries rely on lifecycle methods 2. They catch errors during the render phase 3. Hooks (like useEffect) run after render 👉 That’s why hooks can’t replace this (yet) 🧠 What I learned: 1. Error Boundary = try-catch for UI 2. Prevents full app crash 3. Works only for: >rendering errors >lifecycle methods 4. Doesn’t catch: >event handlers >async code 🚀 My takeaway: Even in modern React apps: 👉 We still use one class component for stability 👉 Everything else stays functional Still learning, still exploring. If you’ve used error boundaries in production: 👉 Do you wrap the whole app or specific components? #React #Frontend #WebDevelopment #LearningInPublic

Most Developers Are Using React Native Wrong… Yes, it works. Yes, it’s fast. But that’s NOT why top companies choose it. The real power of React Native isn’t just “write once, run anywhere” — it’s how you structure what you write. After working on multiple production apps, here’s what actually makes a difference: 1. Stop thinking in screens — think in reusable systems If your components aren’t reusable, you’re just duplicating problems. 2. Performance is NOT automatic Poor state management + unnecessary re-renders = slow apps Optimize early, not after complaints. 3. Clean architecture > quick hacks Shortcuts feel fast… until they slow down your entire project. 4. Native modules are your friend The best apps don’t avoid native — they use it smartly. 5. Your folder structure matters more than you think A messy project kills scalability faster than bad code. The truth? React Native doesn’t make you a great developer. Your decisions do. I’m curious — what’s the biggest challenge you’ve faced with React Native? Drop your thoughts #ReactNative #MobileDevelopment #JavaScript #AppDevelopment #SoftwareEngineering #CleanCode #Programming #Developers

Your React app feels slow, and you have no idea why. The truth is, it is probably re-rendering 10x more than it should be. React core philosophy is that UI is a function of state. When state changes, React re-evaluates the component tree. But if you are not careful, a single state change at the top of your tree can trigger a massive wave of unnecessary re-renders all the way down to the bottom. Here are the 3 most common reasons your React app is re-rendering too much: 1. Passing new object references in props. If you pass an inline object or function like style={{ color: 'red' }} or onClick={() => doSomething()}, React sees a brand new reference on every single render. Even if the contents are identical, React thinks the prop changed. 2. State lifted too high. If you have a form input that updates on every keystroke, and its state lives in a parent component alongside heavy data tables, typing one letter re-renders the entire table. 3. Missing memoization. Complex calculations or heavy child components that do not depend on the changed state will still re-render by default. React is fast, but it is not magic. Example: Instead of passing inline functions like this: <Button onClick={() => handleSubmit()} /> Use useCallback to keep the reference stable: const handleSubmit = useCallback(() => { ... }, []); <Button onClick={handleSubmit} /> Key takeaways: - Keep state as close to where it is used as possible. - Use memo for expensive child components. - Use useMemo and useCallback to preserve reference equality for objects and functions passed as props. #reactjs #webdevelopment #frontend #javascript #performance #softwareengineering #coding #webdev #reactdeveloper #programming

𝐁𝐢𝐠𝐠𝐞𝐬𝐭 𝐑𝐞𝐚𝐜𝐭 𝐏𝐞𝐫𝐟𝐨𝐫𝐦𝐚𝐧𝐜𝐞 𝐌𝐢𝐬𝐭𝐚𝐤𝐞𝐬 𝐈 𝐌𝐚𝐝𝐞 🚨 When I started working with React, my apps worked… but they were slow 😓 Here are some mistakes I made (and learned from) 👇 ❌ Re-rendering everything unnecessarily I didn’t understand how React re-renders work ✔ Fix: Used React.memo and better component structure ❌ Using useMemo/useCallback everywhere Thought more optimization = better performance ✔ Fix: Used them only where needed ❌ Keeping state at top level One state change → entire app re-render ✔ Fix: Moved state closer to where it’s used ❌ Using index as key in lists Worked fine… until bugs appeared ✔ Fix: Used unique and stable keys ❌ Ignoring large component size Big components = harder to optimize ✔ Fix: Broke them into smaller reusable components ❌ Not measuring performance I was guessing instead of checking ✔ Fix: Used React Profiler and DevTools 💡 Biggest learning Performance issues are not about React being slow They are about how we use React Tip for developers ⚠️ Don’t try to optimize everything Understand the problem first Good developers make things work. Great developers make them fast. 🚀 #ReactJS #FrontendDeveloper #WebDevelopment #JavaScript #Performance #ReactOptimization #SoftwareDeveloper #CodingLife

🚀 React.memo in the simplest way possible Ever noticed your React app getting slower… even when nothing really changed? 🤔 Here’s a small concept that can make a BIG difference 👇 🧠 What is React.memo? 👉 It simply means: “Don’t re-render a component if its props didn’t change.” 🎨 Real-life example Imagine you drew a house yesterday 🏠 Today… nothing changed. Will you draw it again? ❌ No — waste of time ✅ You keep the old drawing 👉 React.memo does the same thing ⚡ Without React.memo Parent updates ALL child components re-render 😓 ⚡ With React.memo Parent updates ONLY changed components re-render ✅ Others are skipped → faster app 🚀 🎯 One-line takeaway 👉 React.memo = Skip unnecessary work → Better performance 💡 Most beginners ignore this… But this is one of the easiest ways to make your app faster. If this helped you, save it for later 🔖 Follow for more simple dev concepts 🚀 #ReactJS #JavaScript #WebDevelopment #FrontendDevelopment #SoftwareEngineering #Programming #Developers #Coding #Tech #Innovation

React Performance Tips Every Developer Should Know If your React app feels “slow,” it’s rarely React’s fault — it’s usually how we use it. Here are practical, battle-tested ways to make your React apps faster: 1. Stop Unnecessary Re-renders Every re-render costs time. Use: React.memo for component memoization useCallback for stable function references useMemo for expensive computations Rule: Re-render only when data actually changes 2. Optimize State Placement Bad state placement = performance bottleneck ❌ Global state for everything ✅ Keep state as close as possible to where it’s used Less state propagation = fewer re-renders 3. Code Splitting & Lazy Loading Don’t load what you don’t need. Use: React.lazy() Suspense Load components only when required (especially routes) 4. Virtualize Large Lists Rendering 1000+ items? That’s a problem. Use libraries like: react-window react-virtualized Render only visible items = massive performance gain 5. Use Proper Keys in Lists Bad keys = wasted re-renders ❌ index as key ✅ stable unique IDs Helps React reconcile efficiently 6. Clean Up Effects Memory leaks = silent performance killer Always: Cleanup subscriptions Cancel API calls Especially inside useEffect 7. Measure Before You Optimize Don’t guess. Measure. Use: React DevTools Profiler Chrome Performance tab Optimize what actually matters Final Thought: Performance is not about writing more code — it’s about writing smarter code. If you found this helpful: 👍 Like 🔁 Repost 💬 Comment your favorite React optimization trick #ReactJS #FrontendDevelopment #WebPerformance #JavaScript #SoftwareEngineering #TechCareers #HiringDevelopers #OpenToWork

🚀 Built something I’m genuinely proud of: a Real-Time Contacts App in React Native 📱 What started as a learning project turned into a deep dive into how real apps actually work — syncing data, handling device permissions, and delivering smooth, production-level UX. 💡 Motto: “Sync. Swipe. Simplify.” Instead of just storing contacts, I built a system where: 📱 Phone Contacts ↔ Realm DB ↔ UI (FlatList) Everything stays connected. Everything updates instantly. ✨ What makes this app special? 🔄 Real-Time Sync Contacts sync between device & local Realm database Add/edit → instantly reflected everywhere ✋ Swipe to Delete Smooth gesture-based deletion Clean animations + intuitive UX 🔃 Pull to Refresh Fetch latest device contacts Keeps everything up-to-date effortlessly 🗄️ Local-First Architecture Realm database with ObjectId Fast, offline-first experience 🎨 Polished UI Floating action button + modals Toasts, loading states, permission handling Optimized FlatList (handles 1000+ contacts smoothly) 🧠 What I learned This project wasn’t just about React Native — it was about thinking like a product developer: Designing real-time data flow Managing cross-platform permissions (iOS + Android) Building gesture-driven UX Structuring a scalable local data layer Watching a contact added on my phone instantly appear in the app… then deleting it with a swipe… That’s when it clicked 💡 — this is what real app experience feels like. If you're working with React Native or exploring local-first apps, I’d love to connect and exchange ideas 🤝 Github: https://lnkd.in/gAH8DMmj #ReactNative #MobileDevelopment #RealmDB #JavaScript #TypeScript #iOSDev #AndroidDev #AppDevelopment #SoftwareEngineering

React Development: CRA vs Vite – What Should You Choose in 2026? When starting a new React project, one of the first decisions is choosing the right build tool. Traditionally, Create React App (CRA) was the go-to option, but today Vite is rapidly becoming the preferred choice. Create React App (CRA) =>Beginner-friendly with minimal setup =>Large and mature ecosystem =>Slower startup and build times as applications grow =>Limited flexibility without ejecting Vite =>Fast development server with near-instant startup =>Efficient Hot Module Replacement for better productivity =>Uses modern ES modules for optimized performance =>Flexible and extensible with plugins Key Insight: Vite serves code on demand instead of bundling everything upfront, which significantly improves development speed and experience. Why developers are choosing Vite: =>Faster development and build performance =>Improved developer experience =>Modern architecture aligned with current web standards My Take: For beginners, CRA is still a simple starting point. For real-world and scalable applications, Vite is a better choice. The shift towards faster and more efficient tooling is clear, and Vite represents that direction. #ReactJS #WebDevelopment #Frontend #JavaScript #Vite #CreateReactApp #Coding #Developers #codebegun

Your React app is slower than it needs to be. Here's how to fix it. Most devs write React the way they learned it — and never revisit it. The result? Unnecessary re-renders, bloated bundles and lists that freeze on scroll. In this carousel I cover 5 patterns I apply to every React project: → useCallback & useMemo — when to use them (and when not to) → Why state lifting is silently killing your render tree → Code splitting: route-level is the highest ROI change you can make → Virtualisation for long lists — 10,000 rows in under 5ms → The performance checklist, in priority order Save this. Your users will notice the difference. If you found this useful, follow me for weekly React & full-stack tips. What's your go-to React performance trick? Drop it in the comments #ReactJS #ReactPerformance #FrontendDevelopment #WebDevelopment #JavaScript #TypeScript #SoftwareEngineering #Programming #WebPerformance #ReactNative #TechTips #FullStackDeveloper #CodeQuality #DeveloperTips #Frontend