Control Child Component Access with React useImperativeHandle

Most React performance problems don’t come from re-renders. They come from creating new identities every render. This is something I completely overlooked for years. --- Example 👇 const options = { headers: { Authorization: token } }; useEffect(() => { fetchData(options); }, [options]); Looks harmless. But this runs on every render. Why? Because "options" is a new object every time → new reference → dependency changes → effect runs again. --- Now imagine this in a real app: - API calls firing multiple times - WebSocket reconnecting randomly - Expensive logic running again and again All because of reference inequality, not value change. --- The fix is simple, but rarely discussed 👇 const options = useMemo(() => ({ headers: { Authorization: token } }), [token]); Now the reference is stable. The effect runs only when it should. --- This doesn’t just apply to objects: - Functions → recreated every render - Arrays → new reference every time - Inline props → can break memoization --- The deeper lesson: React doesn’t compare values. It compares references. --- Since I understood this, my debugging approach changed completely. Whenever something runs “unexpectedly”, I ask: 👉 “Did the reference change?” --- This is one of those small concepts… that silently causes big production issues. --- Curious — have you ever debugged something like this? #ReactJS #Frontend #JavaScript #WebDevelopment #Performance

Just wrapped up a highly satisfying 𝗧𝘆𝗽𝗲𝗦𝗰𝗿𝗶𝗽𝘁 task: a fully playable 𝗠𝗲𝗺𝗼𝗿𝘆 𝗖𝗮𝗿𝗱 𝗚𝗮𝗺𝗲! 💻✨ As I progress through my 𝗜𝗧𝗜 𝗠𝗼𝗯𝗶𝗹𝗲 𝗖𝗿𝗼𝘀𝘀-𝗣𝗹𝗮𝘁𝗳𝗼𝗿𝗺 𝘁𝗿𝗮𝗰𝗸, I am focusing on writing 𝗰𝗹𝗲𝗮𝗻, 𝘀𝘁𝗿𝗼𝗻𝗴𝗹𝘆-𝘁𝘆𝗽𝗲𝗱 𝗢𝗯𝗷𝗲𝗰𝘁-𝗢𝗿𝗶𝗲𝗻𝘁𝗲𝗱 code. This project was the perfect playground to connect strict 𝗯𝗮𝗰𝗸𝗲𝗻𝗱-𝘀𝘁𝘆𝗹𝗲 logic with 𝗳𝗿𝗼𝗻𝘁𝗲𝗻𝗱 𝗨𝗜. 𝗧𝗲𝗰𝗵 𝗦𝘁𝗮𝗰𝗸 & 𝗔𝗿𝗰𝗵𝗶𝘁𝗲𝗰𝘁𝘂𝗿𝗲 𝗛𝗶𝗴𝗵𝗹𝗶𝗴𝗵𝘁𝘀: 🛠️ 𝗧𝘆𝗽𝗲𝗦𝗰𝗿𝗶𝗽𝘁: Heavily utilized Interfaces to define data structures and Classes (Game, Card, SoundManager) to handle states, matches, and the Fisher-Yates shuffle algorithm. 🏗️ 𝗛𝗧𝗠𝗟: Created a clean, semantic layout for the game board and progress tracking. 🎨 𝗖𝗦𝗦: Managed the grid layout and brought the cards to life using smooth, 3D CSS transforms and hover states. Mastering these strict OOP concepts and state management in TypeScript is the perfect stepping stone before diving into cross-platform mobile frameworks! https://lnkd.in/dUj-piVP #TypeScript #JavaScript #WebDev #SoftwareDeveloper #ITI #Coding #Frontend

🚨 Most developers misunderstand React re-rendering I used to think: 👉 “React re-renders = DOM updates” ❌ Wrong. Here’s what actually happens: 🧠 Rendering = React running your component 🔁 Re-render = React running it again BUT… 👉 React does NOT update the DOM every time Instead: ⚡ It creates a Virtual DOM ⚡ Compares old vs new (Reconciliation) ⚡ Updates ONLY what changed 💥 Real insight: 👉 The real problem is NOT DOM updates 👉 It’s unnecessary re-renders Example: Parent re-renders → Child also re-renders Even when nothing changed ❌ 🛠️ Fix: 🛡️ React.memo → skip child render if props same 📦 useMemo → keep props stable Together: 👉 Stable props + memoized component = no wasted work 🧠 Biggest learning today: 👉 “React doesn’t repaint everything… it only fixes what changed.” #React #Frontend #WebDevelopment #Performance #JavaScript #OpenSource

Most React devs are still managing rollback logic by hand in 2026. Here’s the one hook that eliminates it. Every time you build a like button, a follow toggle, or an add-to-cart — you repeat the same flow: update the UI, send the request, handle failure, then undo the change. It works. But it’s a lot of brittle code for something that should be straightforward. React 19 brings useOptimistic — UI updates immediately, and React restores the correct state automatically if the request fails. No try/catch. No manual undo logic. No extra useState. Just define your optimistic reducer and call addOptimistic(). ❌ useState approach Two separate states, a try-catch, manual rollback on error. Doubles your code for every optimistic interaction. Fragile and tedious to maintain at scale. ✅ useOptimistic Declare once. UI updates instantly. React auto-reverts to real state if the action fails — no catch block, no manual rollback, no extra useState. Golden rule: If your UI needs to feel fast but can fail, avoid useState — use useOptimistic and let React handle it. #react #webdev #frontend #javascript #reactjs #coding #softwareengineering #devtips #ReactTips

Understanding your frontend folder structure is key to building maintainable applications! 🚀 This infographic breaks down a clean, scalable setup: 💻 src/: Your application source code. 🏗 components/: Reusable parts of your UI (e.g., buttons, forms). 🧩 pages/: The full layouts for different URL routes in your app. 🧠 redux/ or context/: Where you manage the global state of your application. 🪝 hooks/: Encapsulate reusable, stateful logic. 🌐 api/ & services/: Manage network requests and application logic. A solid structure keeps your codebase organized as your project grows. How do you organize your projects? Let me know in the comments! 👇 #frontend #webdevelopment #coding #reactjs #softwareengineering #fullstack #codeorganisation #ImmediateJoiner #Immediate #angular #javascript #typescript

This is subtle but causes real performance issues: ```js // New function reference every render — React remounts the child each time function ParentComponent() { function ChildComponent() { return <div>Child</div>; } return <ChildComponent />; } ``` Every time ParentComponent renders, React sees a brand new component definition. It unmounts and remounts the child — destroying its state and causing unnecessary DOM operations. The fix is simple — define components at the module level: ```js // Stable reference — React correctly reuses the component function ChildComponent() { return <div>Child</div>; } function ParentComponent() { return <ChildComponent />; } ``` This is one of those mistakes that's easy to make and hard to debug when you don't know what to look for. #ReactJS #JavaScript #Frontend #WebDevelopment

Most React performance advice is wrong. Not because the patterns are bad but because developers apply them without understanding what React is actually doing. Here’s what I’ve learned: React.memo without useCallback is just theater. memo tells React: “Only re-render if prop references change.” But if you pass a new function reference on every render, memo does absolutely nothing. // ❌ Kills memo on every render <ProductCard onSelect={(id) => handleSelect(id)} /> // ✅ Actually works const handleSelect = useCallback((id) => { dispatch({ type: "SELECT", payload: id }); }, [dispatch]); useMemo has a cost use it surgically. React still performs dependency comparison on every render. For cheap computations, the memoization overhead can be higher than simply recalculating. Use useMemo only when: the computation is genuinely expensive the result is passed to a memoized child you’ve measured it, not assumed it Before reaching for memo or useMemo, ask: What is actually triggering the re-render? Can you eliminate the trigger instead of memoizing around it? Structural state changes beat memoization every time. What’s the nastiest React performance bug you’ve hit in production? #React #ReactJS #Frontend #TypeScript #WebDevelopment #MERN #JavaScript #SoftwareEngineering

https://lnkd.in/dhXuQdTD — I used to think a Length Converter was the "Hello World" of apps. As a Senior Frontend Engineer working with TypeScript, I quickly realized that "simple" tools are where the devil is in the details. Building this for my platform, calculator-all.com, taught me a hard lesson about floating-point math and user trust. 📏 I was using React 19 and Tailwind CSS for the UI, keeping things snappy and responsive. ⚡ But a few users pointed out tiny precision errors when converting between obscure units. I had to dive deep into decimal logic to ensure a carpenter and a physicist could both trust the output. 💻 I used Cursor to iterate through edge cases and Vitest to write a suite of tests for over 20 different units. 🤖 Running everything on Bun and Vite made the development cycle incredibly fast, but the real work was in the logic. 🚀 I even had to account for how different locales format their numbers—something many basic tutorials skip. 🛠️ It’s funny how the tools we take for granted often require the most care behind the scenes. ✨ What’s the most "basic" feature you've built that turned out to be surprisingly complex? 📐 #LengthConverter #FrontendEngineer #TypeScript #ReactJS #WebDevelopment #SoftwareEngineering #Bun #Vite #TailwindCSS #React19 #Testing #Coding #JavaScript #UnitTesting #CalculatorAll

I recently completed a project focused on building and enhancing a Simple Todos app. This project was a great way to dive deeper into React state management, conditional rendering, and dynamic UI updates. Key features I implemented: ✅ Dynamic Task Creation: Added a text input and "Add" button to create tasks on the fly. ✅ Bulk Task Entry: Built a smart "Multi-Add" feature automatically generates three separate entries. ✅ In-Place Editing: Implemented an "Edit/Save" toggle for each item, allowing users to update titles without leaving the list. ✅ Task Completion: Added checkboxes with a persistent strike-through effect to track progress. ✅ Stateful Deletion: Ensured a smooth user experience when removing items from the list. This project pushed me to think about component structure, reusable props, and clean UI logic in React. Check out the implementation here: https://lnkd.in/dtG46cwU #Day97 #ReactJS #WebDevelopment #Frontend #JavaScript #CodingProject #LearnToCode #ReactComponents #NodeJS #ExpressJS #BackendDevelopment #WebDevelopment #NxtWave #LearningJourney #TechAchievement