Understanding JavaScript's Event Loop and Task Queue

💡 Did You Know? JavaScript’s event loop processes tasks, microtasks, and rendering in different phases. Because of this, Promise callbacks (microtasks) run before the browser paints the next UI frame. 🌀 This is why async code with promises often executes sooner than expected. Understanding this behavior helps prevent UI glitches, race conditions, and timing bugs while building fast, responsive web apps. Mastering the event loop can greatly improve debugging and performance optimization. 🚀 #Devoticlabs #JavaScript #Didyouknow #AsyncJS #CodingTips

Ever clicked two dropdowns and both stayed open at the same time? 😾 Looks unprofessional. Feels broken. Users hate it. Here is how I fixed it in React with just 2 lines : 👉 When Explore opens → force "Degree" dropdown to close onClick={() => {  setIsExploreMenuOpen(!isExploreMenuOpen);  setIsDegreeMenuOpen(false); // ← this one line does it }} 👉 When Degree opens → force "Explore" dropdown to close onClick={() => {  setIsDegreeMenuOpen(!isDegreeMenuOpen);  setIsExploreMenuOpen(false); // ← same idea }} The logic is simple: When you open something → explicitly close everything else. React does not do this automatically. You have to tell it exactly what to close. Small detail. Big difference in user experience. #react #nextjs #javascript #webdevelopment #tailwindcss #buildinpublic #frontenddevelopment

Code splitting and Tree shaking. They solve different problems 👇 🧹 Tree Shaking Removes unused code at build time using static analysis of imports/exports. ➡️ Result: Smaller bundle 📦 Code Splitting Breaks your app into chunks using dynamic import() or routes. ➡️ Result: Load only what’s needed, when it’s needed ⸻ 💡 Simple way to remember: • Tree shaking = remove extra code • Code splitting = delay loading code ⸻ ⚡ Best performance comes from using both together: Small bundles + smarter loading = faster apps ⸻ Are you optimizing for size, delivery… or both? #Frontend #WebPerformance #JavaScript #ReactJS #CodeSplitting #TreeShaking #WebDevelopment #PerformanceOptimization #SoftwareEngineering

I removed useEffect from my code… and my app got faster ⚡ Yes, seriously. For a long time, I was doing this in React: useEffect(() => { fetchUsers(); }, []); Seemed correct… right? ❌ But in real projects, this caused: • Multiple unnecessary API calls • Data mismatch bugs • Hard-to-control logic 💡 Then I changed my approach: Instead of auto-calling APIs inside useEffect, 👉 I started triggering APIs based on user actions Example: • Search → onChange • Button → onClick ✅ Result: • Better control over API calls • Cleaner component logic • Improved performance (~30% fewer calls) 🔥 What I learned: useEffect is powerful… but overusing it makes your code messy. 💬 Curious: Do you still rely on useEffect for API calls? #ReactJS #FrontendDeveloper #JavaScript #CodingTips #WebDevelopment

I removed useEffect from my code… and my app got faster ⚡ Yes, seriously. For a long time, I was doing this in React: useEffect(() => { fetchUsers(); }, []); Seemed correct… right? ❌ But in real projects, this caused: • Multiple unnecessary API calls • Data mismatch bugs • Hard-to-control logic 💡 Then I changed my approach: Instead of auto-calling APIs inside useEffect, 👉 I started triggering APIs based on user actions Example: • Search → onChange • Button → onClick ✅ Result: • Better control over API calls • Cleaner component logic • Improved performance (~30% fewer calls) 🔥 What I learned: useEffect is powerful… but overusing it makes your code messy. 💬 Curious: Do you still rely on useEffect for API calls? #ReactJS #FrontendDeveloper #JavaScript #CodingTips #WebDevelopment

Today I explored some important concepts in React that make apps more scalable and dynamic. 🔹 Learned Context API to manage global state 🔹 Worked with React Router DOM for navigation 🔹 Implemented routing using RouterProvider and createBrowserRouter 🔹 Built multiple pages: Home, About, Contact 🔹 Learned how to navigate between pages smoothly 🔹 Extracted dynamic parameters (like id) from URL 🔹 Fetched real data from GitHub API (followers) 🔗 GitHub Profile: https://lnkd.in/gMurynAg 📌 Key takeaway: Understanding routing + global state is a big step toward building real-world React applications. #React #WebDevelopment #JavaScript #Frontend #LearningInPublic #100DaysOfCode

Underrated React libraries more people should be using 👇 1. react-aria → makes accessibility actually manageable 2. valtio → state management without the usual complexity 3. cmdk → build clean command menus (like modern apps) 4. react-resizable-panels → super useful for dashboards 5. usehooks-ts → simple, production-ready hooks Used cmdk recently — really clean and easy to integrate. I’m starting to realize… good frontend isn’t about using popular tools, it’s about using the right ones. What’s one underrated library you’ve used lately? 👀 #ReactJS #FrontendDevelopment #WebDevelopment #JavaScript #UIDesign

💡 useMemo vs useCallback — Same goal, different purpose! If you’ve ever been confused between these two React hooks, you’re not alone 😄 They both help with performance optimization… but they solve different problems. Let’s simplify 👇 🔹 useMemo → Caches a VALUE It remembers the result of a computation. 👉 Use it when: You have expensive calculations You don’t want them to run on every render Example: const filteredList = useMemo(() => { return items.filter(item => item.includes(search)); }, [items, search]); 🔹 useCallback → Caches a FUNCTION It remembers the function definition. 👉 Use it when: Passing functions to child components Preventing unnecessary re-renders Example: const handleClick = useCallback(() => { console.log("Clicked"); }, []); 🔁 Key Difference useMemo → “Save the RESULT” useCallback → “Save the FUNCTION” 🚀 Final Thought Think of it this way: If you're calculating something → useMemo If you're passing a function → useCallback Master this, and your React apps become more efficient and optimized 💪 #ReactJS #FrontendDevelopment #JavaScript #WebPerformance #CodingTips

Just shipped my Day 17/30 JavaScript challenge: a fully functional To-Do List app! Built with vanilla JS, this project showcases DOM manipulation, event listeners, and dynamic element creation in action. Features include adding tasks, marking them complete with a strikethrough effect, deleting individual items, and clearing everything at once. The sleek UI is fully responsive and built with pure HTML, CSS, and JavaScript. no frameworks, just core fundamentals. Tech topics covered: querySelector, innerHTML, createElement, addEventListener, and event delegation. From image uploaders to task managers, each project peels back another layer of web development. Check it out live: https://lnkd.in/d34HUqPn #FullStackDeveloper #JavaScript #WebDevelopment #CodeGuru #FrontendDevelopment

Your UI lag is not always React. Sometimes… It’s the JavaScript event loop. Here’s what’s happening 👇 JavaScript is single-threaded. So when you run: → Heavy calculations → Large loops → Sync blocking code You block: ❌ Rendering ❌ User interactions Result: → UI freezes → Clicks feel delayed → App feels slow React can’t help here. Because it runs on the same thread. What works: ✔ Break work into chunks ✔ Use requestIdleCallback / setTimeout ✔ Offload heavy tasks (Web Workers) Key insight: Performance is not just “React optimization”. It’s understanding how the browser executes code. Ignore the event loop… And your UI will suffer. #JavaScript #EventLoop #Frontend #ReactJS #Performance #SoftwareEngineering #WebDevelopment #AdvancedReact #Engineering #Optimization