Why Key Resets React Component State

Your React app works. But is it fast? ⚡ Here are 11 performance tips every React dev should know: 1️⃣ React.memo → prevent unnecessary re-renders 2️⃣ useMemo → cache expensive calculations 3️⃣ useCallback → stable function references 4️⃣ Lazy load components → smaller initial bundle 5️⃣ Virtualize long lists → use react-window 6️⃣ Keep state local → don't over-use Redux/Context 7️⃣ Cache API responses → use React Query or SWR 8️⃣ Optimize images → WebP + loading="lazy" 9️⃣ Avoid layout thrashing → batch DOM reads & writes 🔟 No inline objects in JSX → define styles outside render 1️⃣1️⃣ Code split → dynamic imports for heavy components The golden rule? Profile first with React DevTools. Then optimize where it actually matters. Premature optimization is still a trap. 😅 Which of these do you already use? Drop it below 👇 #ReactJS #JavaScript #Frontend #WebPerformance #TechTips #WebDevelopment #FullStack

I stared at my kitchen and saw butter, flour, eggs, and chocolate chips. No recipe in mind. No idea what to make. So I did what any developer would do — I built an app to solve it. 🧑💻 Introducing BakeWhatYouHave 🍳 — a responsive React app that finds you the perfect recipe based on ingredients you already have at home. No more switching between 10 browser tabs. No more "Oh I need heavy cream" moments halfway through. Just open the app, tick your ingredients, and bake. Here's what I built: → Searchable ingredient selector with tag-based UI → Smart recipe matching with a % match score → Highlights exactly what you HAVE and what you're MISSING → Full recipe detail modal with step-by-step instructions → 100% responsive → Built with React 18, hooks only (useState, useEffect, useMemo) — no Redux, no UI libraries The hardest part wasn't the code. It was resisting the urge to actually bake everything. 🍫 Github: https://lnkd.in/da-J_Csf #ReactJS #Frontend #WebDevelopment #JavaScript #BuildInPublic #React #OpenSource #HTML #CSS #BakeWhatYouHave

Your React app is slow. Here's why. 🐢 Most devs jump straight to optimization tools. But 90% of the time, the fix is simpler: 🔴 Fetching data in every component independently → Lift it up or use a global state solution 🔴 Importing entire libraries for one function → `import _ from 'lodash'` hurts. Use named imports. 🔴 No lazy loading on heavy routes → React.lazy() exists. Use it. 🔴 Images with no defined size → Layout shifts kill perceived performance 🔴 Everything in one giant component → Split it. React re-renders what changed, not what didn't. Performance isn't magic. It's just not making avoidable mistakes. Save this for your next code review. 🔖 #ReactJS #Frontend #WebPerformance #JavaScript #WebDev

Today I explored React Router and key concepts behind Single Page Applications (SPA). 🔹 SPA – Loads a single HTML page and dynamically updates content without full page reloads. Example: Facebook, Gmail. 🔹 React SPA – Component-based SPA built with React. Each UI part is a reusable component. 🔹 Routing – Controls which component shows based on the URL, keeping navigation fast. 🔹 Nested Routing & Outlet – Parent routes can have child routes, and Outlet decides where the child renders. Example: Dashboard → Profile / Settings. 🔹 Link & NavLink – Link navigates without reload; NavLink highlights active routes. 🔹 Loader & useLoaderData – Fetch data before route renders and access it in the component easily. 🔹 Params & Dynamic Routes – Capture dynamic URL values with: id and useParams(). Example: /user/5 → id = 5. 🔹 useNavigate – Programmatically navigate between routes. Example: Redirect after form submission. Understanding these makes building scalable and smooth React apps much easier! #React #SPA #Frontend #WebDevelopment #JavaScript

I used to think I understood React… until I had to pass the same state through 3–4 components just to control one small thing 😅 It worked, but it didn’t feel right. So instead of jumping to another tutorial, I tried to actually "understand the problem" and that led me to the Context API. To keep things simple, I built a tiny “bulb toggle” app 💡 At first, everything was prop-based. Then I switched to Context… and the difference was obvious. Now: 1. I’m not passing props through unnecessary layers 2. Components feel more independent 3. The code is easier to read and reason about But I also learned something important while doing this: 👉 Context is helpful, but it’s not a replacement for everything If the state is simple and only needed in a few places, props are still totally fine. Context starts to make sense when multiple parts of your app need the same data. Still early in my journey, but this was one of those small moments where things started to click. If you’ve worked with Context before -> 👉 how do you decide between props, Context, or other state tools? #learninginpublic #reactjs #webdevelopment #javascript #frontenddevelopment

✨ 𝗗𝗮𝘆 𝟯 𝗼𝗳 𝗠𝘆 𝗥𝗲𝗮𝗰𝘁 𝗝𝗼𝘂𝗿𝗻𝗲𝘆 ⚛️🚀 Today I learned about 𝗥𝗲𝗮𝗰𝘁 𝗛𝗼𝗼𝗸𝘀, especially the 𝘂𝘀𝗲𝗦𝘁𝗮𝘁𝗲 𝗵𝗼𝗼𝗸 — and this finally made React feel more practical. Before this, I was thinking about how we usually update the UI manually in JavaScript — selecting elements, changing text, updating the DOM step by step. It works, but it can get messy and hard to manage as the app grows. With `𝘂𝘀𝗲𝗦𝘁𝗮𝘁𝗲`, React handles that for us. We just update the 𝘀𝘁𝗮𝘁𝗲, and React automatically updates the UI. No need to manually touch the DOM every time. That shift in thinking was really interesting — instead of telling the browser 𝗵𝗼𝘄 to update, we just tell React 𝘄𝗵𝗮𝘁 the state should be. Starting to see why React is so powerful for building dynamic apps 💻⚡ #ReactJS #JavaScript #WebDevelopment #LearningJourney #FrontendDevelopment

Most developers try to optimize React apps… without knowing what’s actually slow. That’s the problem. Before you optimize… You need to measure. That’s where the React Profiler comes in 🔍 ⚡ What is React Profiler? A tool (inside React DevTools) that shows: • Which components are re-rendering • How long each render takes • Why a component re-rendered 🧠 What it helps you discover • Unnecessary re-renders • Slow components • Expensive computations • Props/state changes causing re-renders 🔍 Real example You click a button and suddenly the whole page re-renders. Profiler shows: 👉 A parent component updated 👉 All child components re-rendered 👉 Even the ones that didn’t need to 🚀 How to fix (after profiling) • Wrap components with React.memo • Use useMemo for heavy calculations • Use useCallback for stable functions • Avoid passing new object/array references 💡 Biggest mistake Optimizing blindly. Adding memoization everywhere… without knowing if it even helps. Measure → Identify → Optimize That’s the correct flow. 💡 React performance is not about writing more code. It’s about writing smarter code based on data. Have you ever used React Profiler to fix a real issue? 👇 #React #Frontend #WebPerformance #JavaScript #SoftwareEngineering #WebDevelopment

👩💻React confused me for 3 weeks straight. Props. State. Hooks. Components. Virtual DOM. I felt like everyone else understood it except me. Then I stopped watching tutorials and just BUILT something. Here are the 5 React concepts that finally made it click for me: 1. Component = A reusable Lego brick Everything in React is a component. Think in pieces. 2. Props = Data flowing DOWN Parent sends data to child. One direction. Always. 3. State = Data that changes When state changes, React re-renders. That’s the magic. 4. useEffect = Do something AFTER render Fetch data, set up listeners, run side effects here. 5. useState = The most used hook const [value, setValue] = useState(initialValue) That’s it. That’s 80% of React. Stop tutorial hopping. Build a todo app. Build a weather app. The concepts will stick when you BUILD. 🛠️ Which React concept confused you the most? 👇 #ReactJS #JavaScript #FrontendDev #WebDevelopment #ReactHooks #LearnReact #CodeNewbie #FresherLife #TechEducation #UIDesign #BuildInPublic #TechCareers

useCallback doesn't actually make your app faster I see devs wrap every callback in useCallback thinking it's a performance  optimization. But here's the truth: The trade-off: - useCallback has overhead (memory + complexity) - Only worth it if child component is wrapped in React.memo() - Most apps don't need it Real performance issues: - Too many DOM nodes (not callbacks) - Inefficient state updates (batching issue) - Expensive computations (use useMemo instead) - Missing keys in lists (array render issue) I spent 2 weeks optimizing callbacks in PulseStack. Removed 80% of them.  Result? No performance change. What changed performance was fixing my  list rendering and state update batching. the lesson i learn is Profile your code before optimizing. Don't optimize blindly. happy to hear your pov 🙂 too ! , i am also here to learn ✨ from you guys . #React #Performance #JavaScript #WebDevelopment #FrontendOptimization

🚀 I improved my Next.js app performance without adding any new library… Most developers think performance = install more packages. I used to think the same. But recently, while working on a production project, I focused on fixing fundamentals instead of adding complexity 👇 ✅ Reduced unnecessary re-renders ✅ Optimized API calls (no duplicate fetching) ✅ Used proper dynamic imports in Next.js ✅ Cleaned up unused components & heavy logic 📉 Result? - Faster page load - Better Lighthouse score - Smoother user experience 💡 Biggest lesson: Performance is not about tools — it's about understanding your code deeply. Sometimes, the best optimization is removing things, not adding. Curious — what’s one performance mistake you’ve seen developers make often? #reactjs #nextjs #webdevelopment #frontend #performance #javascript