useDeferredValue in React for Smooth UI Without Blocking

🚀 Understanding useRef in React — Simplified! Not all data in React should trigger a re-render. 👉 That’s where useRef becomes powerful. 💡 What is useRef? useRef is a hook that lets you store a mutable value that persists across renders—without causing re-renders. ⚙️ Basic Syntax const ref = useRef(initialValue); 👉 Access value using: ref.current 🧠 How it works Value persists across renders Updating it does NOT trigger re-render Works like a mutable container 🔹 Example const countRef = useRef(0); const handleClick = () => { countRef.current += 1; console.log(countRef.current); }; 👉 UI won’t update—but value persists 🧩 Real-world use cases ✔ Accessing DOM elements (focus, scroll) ✔ Storing previous values ✔ Managing timers / intervals ✔ Avoiding unnecessary re-renders 🔥 Best Practices (Most developers miss this!) ✅ Use useRef for non-UI data ✅ Use it for DOM access ✅ Combine with useEffect when needed ❌ Don’t use useRef for UI state ❌ Don’t expect UI updates from it ⚠️ Common Mistake // ❌ Expecting UI update countRef.current += 1; 👉 React won’t re-render 💬 Pro Insight 👉 useRef = Persist value without re-render 👉 useState = Persist value with re-render 📌 Save this post & follow for more deep frontend insights! 📅 Day 14/100 #ReactJS #FrontendDevelopment #JavaScript #ReactHooks #useRef #WebDevelopment #SoftwareEngineering #100DaysOfCode 🚀

⚛️ 𝗜𝗺𝗽𝗿𝗼𝘃𝗶𝗻𝗴 𝗥𝗲𝗮𝗰𝘁 𝗣𝗲𝗿𝗳𝗼𝗿𝗺𝗮𝗻𝗰𝗲 — 𝗨𝘀𝗶𝗻𝗴 𝗖𝗼𝗱𝗲 𝗦𝗽𝗹𝗶𝘁𝘁𝗶𝗻𝗴 As React applications grow, bundle size increases — which directly impacts initial load time. Common problem: • large JS bundle • slow first load • unnecessary code loaded upfront A better production approach is 𝗖𝗼𝗱𝗲 𝗦𝗽𝗹𝗶𝘁𝘁𝗶𝗻𝗴. ❌ 𝗪𝗶𝘁𝗵𝗼𝘂𝘁 𝗖𝗼𝗱𝗲 𝗦𝗽𝗹𝗶𝘁𝘁𝗶𝗻𝗴 𝘪𝘮𝘱𝘰𝘳𝘵 𝘋𝘢𝘴𝘩𝘣𝘰𝘢𝘳𝘥 𝘧𝘳𝘰𝘮 "./𝘋𝘢𝘴𝘩𝘣𝘰𝘢𝘳𝘥"; 𝘪𝘮𝘱𝘰𝘳𝘵 𝘙𝘦𝘱𝘰𝘳𝘵𝘴 𝘧𝘳𝘰𝘮 "./𝘙𝘦𝘱𝘰𝘳𝘵𝘴"; 𝘪𝘮𝘱𝘰𝘳𝘵 𝘚𝘦𝘵𝘵𝘪𝘯𝘨𝘴 𝘧𝘳𝘰𝘮 "./𝘚𝘦𝘵𝘵𝘪𝘯𝘨𝘴"; All components load upfront — even if not used immediately. ❌ 𝗪𝗶𝘁𝗵𝗼𝘂𝘁 𝗖𝗼𝗱𝗲 𝗦𝗽𝗹𝗶𝘁𝘁𝗶𝗻𝗴 𝘪𝘮𝘱𝘰𝘳𝘵 { 𝘭𝘢𝘻𝘺, 𝘚𝘶𝘴𝘱𝘦𝘯𝘴𝘦 } 𝘧𝘳𝘰𝘮 "𝘳𝘦𝘢𝘤𝘵"; 𝘤𝘰𝘯𝘴𝘵 𝘋𝘢𝘴𝘩𝘣𝘰𝘢𝘳𝘥 = 𝘭𝘢𝘻𝘺(() => 𝘪𝘮𝘱𝘰𝘳𝘵("./𝘋𝘢𝘴𝘩𝘣𝘰𝘢𝘳𝘥")); 𝘤𝘰𝘯𝘴𝘵 𝘙𝘦𝘱𝘰𝘳𝘵𝘴 = 𝘭𝘢𝘻𝘺(() => 𝘪𝘮𝘱𝘰𝘳𝘵("./𝘙𝘦𝘱𝘰𝘳𝘵𝘴")); 𝘧𝘶𝘯𝘤𝘵𝘪𝘰𝘯 𝘈𝘱𝘱() {   𝘳𝘦𝘵𝘶𝘳𝘯 (     <𝘚𝘶𝘴𝘱𝘦𝘯𝘴𝘦 𝘧𝘢𝘭𝘭𝘣𝘢𝘤𝘬={<𝘱>𝘓𝘰𝘢𝘥𝘪𝘯𝘨...</𝘱>}>       <𝘋𝘢𝘴𝘩𝘣𝘰𝘢𝘳𝘥 />       <𝘙𝘦𝘱𝘰𝘳𝘵𝘴 />     </𝘚𝘶𝘴𝘱𝘦𝘯𝘴𝘦>   ); } Now components load 𝗼𝗻𝗹𝘆 𝘄𝗵𝗲𝗻 𝗻𝗲𝗲𝗱𝗲𝗱. 📌 Where this helps most: • large dashboards • admin panels • multi-page apps • heavy third-party libraries 📌 𝗣𝗿𝗼𝗱𝘂𝗰𝘁𝗶𝗼𝗻 𝗕𝗲𝗻𝗲𝗳𝗶𝘁𝘀: • faster initial load • reduced bundle size • better performance • improved user experience 📌 𝗕𝗲𝘀𝘁 𝗣𝗿𝗮𝗰𝘁𝗶𝗰𝗲𝘀: • split at route level • avoid over-splitting • use meaningful fallbacks • monitor bundle size Loading everything at once works — but splitting wisely improves performance significantly. 💬 Curious — do you apply code splitting at route level or component level? #ReactJS #CodeSplitting #Performance #FrontendDevelopment #JavaScript #WebDevelopment #SoftwareEngineering #Optimization

Everything inside your component is recreated on every render. Most developers know this. But very few actually feel the impact of it. I didn’t… until it started affecting performance in a real feature. When React re-renders a component, it doesn’t “update” it. It runs the entire function again. That means: • Variables are re-created   • Functions get new references   • Objects & arrays become new instances  Even if the UI looks exactly the same. At first, this feels harmless. Until you see something like this 👇 A small state change in parent →   Triggers multiple child re-renders →   No visible bug → but UI becomes slower  The problem wasn’t React. It was this: const data = { value: count }; const handleClick = () => doSomething(); Looks fine. But on every render: - data is a new object   - handleClick is a new function  And React sees: “New reference = something changed” The real issue is not re-rendering. It’s uncontrolled identity changes. That’s when these stopped being “optimizations” for me: • React.memo   • useCallback   • useMemo  And became tools to control behavior. The shift that matters: Don’t ask: Why did it re-render? Ask: What changed by reference? Once you understand this, you stop writing React casually. And start writing it intentionally. Curious — what’s one time React rendering surprised you? #ReactJS #Frontend #JavaScript #WebDevelopment #SoftwareEngineering #DevLife

Built a Smart Discount Calculator using React What started as a simple assignment turned into an opportunity to focus on clean architecture, scalability, and user experience. Project Highlights ✔️ Real-time discount calculations with instant UI updates ✔️ Clean and modern dark-themed interface ✔️ Fully modular, reusable component structure Tech & Concepts Applied ✅ React Hooks (useState, useEffect with multiple dependencies) ✅ Custom Hook (useCalculator) for business logic separation ✅ Component-based architecture (8+ reusable components) ✅ Utility functions & constants structured in separate layers ✅ Input validation (edge cases handled properly) ✅ Dynamic feedback system: Low Discount / Good Deal / Amazing Offer 📁 Project Architecture src/ ├── hooks/ → business logic ├── components/ → reusable UI ├── utils/ → helper functions └── constants/ → configuration Key Takeaway Writing scalable and maintainable code is just as important as building functionality. Refactoring into a modular structure significantly improved readability, debugging, and future extensibility. 💬 Always open to feedback and suggestions! #React #ReactJS #JavaScript #FrontendDevelopment #WebDevelopment #CleanCode #SoftwareEngineering #LearningJourney #Projects #Coding

I got tired of rebuilding the same frontend over and over. So I built a tool that does it for me. Most backend driven projects hit the same wall. The backend is done, the spec is written, and now someone has to build the admin UI. Tables, forms, auth, pagination, all from scratch, again. I built UIGen -a runtime frontend to solve that. Point it at any OpenAPI or Swagger spec and get a fully interactive React frontend in seconds: npx @uigen-dev/cli serve ./openapi.yaml No config. No boilerplate. A complete UI is live at localhost:4400. What you get out of the box: → Sidebar nav auto-built from your resources → Table views with sorting, pagination, and filtering → Create/edit forms with validation derived from your schema → Auth flows — Bearer, API Key, HTTP Basic, credential-based login → Multi-step wizards for large forms → Custom action buttons for non-CRUD endpoints → Dashboard with resource counts How it works: The spec gets parsed into a framework-agnostic Intermediate Representation (IR). A pre-built React SPA reads that IR and renders the right views. A built-in proxy handles API calls and auth injection - no CORS headaches. React is the default renderer. Svelte and Vue are in progress. Same spec, different stack. Limitations: it's not a design tool. It won't replace a pixel-perfect consumer frontend. But for internal tools, rapid prototyping, or giving API consumers an instant UI, it's a serious time-saver. npm: @uigen-dev/cli GitHub: https://lnkd.in/dFdfUXxH Still in early beta, plenty of edge cases #OpenAPI #DeveloperTools #OpenSource #React #WebDevelopment t #DevTools

The `useDeferredValue` hook completely shifted how I handled performance in my React applications. I moved away from fighting with "janky" interfaces during heavy UI updates. I stopped relying on clunky debounce functions or manual timers to keep my inputs smooth—React essentially took over the timing for me. It created a bridge between instant user interactions and the heavy processing happening in the background. My components felt lighter, and the user experience became noticeably more fluid without any extra overhead. Key highlights from my experience: ⏺ Prioritized responsiveness: I allowed the search bar to stay snappy while the complex data results "lagged" slightly behind. ⏺ Avoided UI freezes: Instead of the whole screen locking up, React kept the previous UI visible until the new one was ready. ⏺ Simplified optimization: I paired it with memo to ensure heavy components only re-rendered when the deferred value finally caught up. ⏺ Replaced manual throttling: I ditched the old setTimeout hacks for a native, smarter way to handle rapid state changes. ⏺ Managed background transitions: It gave me a clean way to show "stale" content while the fresh data was being calculated. #react #webdevelopment #javascript #hooks #frontend

Why does your 'ref' return 'null' the moment you wrap your input in a custom component? It is one of those React quirks that trips up even experienced developers. By default, refs do not behave like props. They are treated as special instances that stop at the component boundary to protect encapsulation. This is exactly why we need 'forwardRef'. It acts as a bridge that allows a parent component to reach through a child and grab a direct handle on an internal DOM node. The most practical application is building a reusable UI library. If you create a custom 'Input' or 'Button' component, your parent component might need to call '.focus()' or '.scrollIntoView()'. Without 'forwardRef', your parent is just holding a reference to a React internal object, not the actual HTML element. Another real-world scenario involves Higher-Order Components (HOCs). If you wrap a component with a 'withAnalytics' or 'withTheme' wrapper, that wrapper will 'swallow' the ref by default. By using 'forwardRef' in your HOC implementation, you ensure the reference passes through the wrapper and lands on the component that actually needs it. It is about making your abstractions transparent and ensuring that the parent component maintains the control it expects over the physical DOM. Using this pattern sparingly is key. It is an escape hatch for those moments where declarative state isn't enough to manage physical browser behavior. It keeps your component interfaces clean while providing the necessary access for specialized UI interactions. #ReactJS #SoftwareEngineering #Frontend #WebDevelopment #Javascript #CodingTips #CodingBestPractices

🚀 useTransition in React — Make Slow UI Feel Fast Ever faced this? 👉 Typing in search feels laggy 👉 UI freezes during heavy updates That’s where useTransition changes everything. 💡 What is useTransition? useTransition lets you mark updates as non-urgent 👉 So React can prioritize important work first ⚙️ Basic Syntax const [isPending, startTransition] = useTransition(); 🧠 How it works 👉 You wrap slow updates: startTransition(() => { setFilteredData(expensiveFilter(data)); }); 👉 React: ✔ Prioritizes user input ✔ Delays heavy computation ✔ Keeps UI responsive 🧩 Real-world Example Search with large dataset: ❌ Without useTransition: Typing lags UI blocks ✅ With useTransition: Typing is smooth Results update in background 🔥 Key Benefit 👉 Separates updates into: ✔ Urgent → user interaction ✔ Non-urgent → heavy rendering ⚠️ Common Mistake // ❌ Wrapping everything startTransition(() => { setInput(value); }); 👉 Don’t delay urgent updates (like typing) 🔥 Best Practices ✅ Use for heavy UI updates ✅ Use with filtering/searching ✅ Show loading state using isPending ❌ Don’t use for simple state updates 💬 Pro Insight (Senior-Level Thinking) 👉 Performance is not just about speed 👉 It’s about perceived responsiveness 📌 Save this post & follow for more deep frontend insights! 📅 Day 25/100 #ReactJS #FrontendDevelopment #JavaScript #ReactHooks #PerformanceOptimization #ConcurrentRendering #SoftwareEngineering #100DaysOfCode 🚀

I spent 3 hours debugging a “simple” frontend issue… and it turned out to be one line. The problem? An API was getting called on every keystroke. Network tab = chaos 👀 Dozens of API calls for a single search. 👉 The issue: No debouncing. Here’s what the code looked like before: useEffect(() => { if (!query) return; fetch(`https://lnkd.in/eNE6UBeq) .then(res => res.json()) .then(data => setData(data)); }, [query]); Every keypress → API call ❌ Here’s the fix (debouncing): useEffect(() => { if (!query) return; const timer = setTimeout(() => { fetch(`https://lnkd.in/eNE6UBeq) .then(res => res.json()) .then(data => setData(data)); }, 300); return () => clearTimeout(timer); }, [query]); ✅ API calls reduced by ~70% ✅ Smoother UI ✅ Better user experience Lesson: Frontend performance isn’t just about what you render… It’s about when you trigger things. Small change. Big impact. Have you used debouncing or throttling in your apps? Where did it make the biggest difference? #frontend #reactjs #javascript #webperformance #softwareengineering

Most React developers start API calls with useEffect(). It works. Until the project gets bigger. Then suddenly: ❌ Manual loading state ❌ Manual error handling ❌ Duplicate API calls ❌ No caching ❌ Refetch logic becomes messy ❌ Background sync becomes difficult ❌ Race conditions become common And your component starts doing too much. That’s when you realize: useEffect is not a data-fetching solution. It is a side-effect hook. That’s where React Query changes everything. useEffect helps you run effects. React Query helps you manage server state. That difference is huge. Use useEffect() for: ✔ Timers ✔ Event listeners ✔ Subscriptions ✔ External system sync ✔ Simple one-time logic Use React Query for: ✔ API fetching ✔ Response caching ✔ Auto refetching ✔ Pagination ✔ Infinite scroll ✔ Mutations ✔ Background updates ✔ Optimistic UI The biggest mistake is using useEffect like a mini backend framework. It was never designed for that. Better architecture: Client state → useState() / useReducer() Server state → React Query That separation creates: ✔ Cleaner code ✔ Better UX ✔ Faster applications ✔ Less debugging ✔ Predictable state management Good React code is not about using fewer libraries. It is about using the right tool for the right problem. Sometimes the best optimization is removing unnecessary code—not adding more. What do you prefer for API calls in production apps: useEffect() or React Query? 👇 #ReactJS #ReactQuery #useEffect #FrontendDevelopment #JavaScript #StateManagement #WebDevelopment #SoftwareEngineering