Throttling in JavaScript for Smooth Performance

useEffect — The Hook That Confused Me (Until I Got This) useEffect was confusing until I understood one thing: dependencies control everything. The Rule: javascript // Runs ONCE after mount useEffect(() => { fetchData(); }, []); // Runs when userId changes useEffect(() => { fetchUser(userId); }, [userId]); // Runs on EVERY render (avoid!) useEffect(() => { console.log('render'); }); What I Learned the Hard Way: Missing dependencies = stale data Adding everything = infinite loops Cleanup functions matter (especially for subscriptions) My Checklist: What should trigger this effect? Do I need to clean up? Can this cause unnecessary renders? What's your React Hook survival tip? #ReactJS #JavaScript #FrontendDeveloper #WebDev #CodingTi

⚛️ React Concept: useEffect Explained Simply The "useEffect" hook lets you handle side effects in functional components — like API calls, subscriptions, and DOM updates. 🔹 It runs after the component renders 🔹 You can control when it runs using the dependency array Basic syntax: useEffect(() => { // side effect logic return () => { // cleanup logic (optional) }; }, [dependencies]); 📌 Common use cases: • Fetching data from APIs • Adding event listeners • Handling timers 📌 Best Practice: Always define dependencies correctly and use cleanup functions to avoid memory leaks. #reactjs #frontenddevelopment #javascript #webdevelopment #softwareengineering

useEffect is probably the most powerful - and most misused - hook in React. 🎯 Arun explained it really well, sharing this because I've made  these exact mistakes in real projects: → Forgetting the cleanup function - memory leaks in production 😅 → Wrong dependency array - stale data showing up in dashboards → Fetching data inside useEffect - unnecessary re-renders and   race conditions What changed for me: ✅ Always write cleanup for subscriptions and event listeners ✅ Use React Query for data fetching — avoids most useEffect complexity ✅ Think twice before adding objects/arrays as dependencies 2.5 years of React and useEffect still teaches me something new. What's your most common useEffect mistake? Drop it below 👇 #ReactJS #Frontend #JavaScript #WebDevelopment #FrontendDeveloper

🚀 Day 30 - 💡 JavaScript Tricky Question Explanation const arr = [4, 10, 2, 8]; const result = arr.find(num => num > 5) + arr.findIndex(num => num > 5); console.log(result); 👉 Output: 11 👉 Explanation: * find() returns the first value > 5 → `10` * findIndex() returns its index → `1` * Final result → `10 + 1 = 11` ⚡ Both stop at the **first match** #JavaScript #WebDevelopment #Frontend #CodingInterview #JSConcepts

🚀 💡 JavaScript Tricky Question Explanation const arr = [4, 10, 2, 8]; const result = arr.find(num => num > 5) + arr.findIndex(num => num > 5); console.log(result); 👉 Output: 11 👉 Explanation: * find() returns the first value > 5 → `10` * findIndex() returns its index → `1` * Final result → `10 + 1 = 11` ⚡ Both stop at the **first match** #JavaScript #WebDevelopment #Frontend #CodingInterview #JSConcepts

⏱️ Built a Todo List with Timer using React Tried building a Todo List where each task has its own timer control — small idea but interesting state handling. Features: • Add todos dynamically • Start timer for each task individually • Reset timer per task • Delete tasks • Independent timer state for every item What I learned: • Managing multiple independent states in a list • Handling setInterval / timers safely in React • Avoiding memory leaks with proper cleanup • Structuring components for better state isolation • Updating UI efficiently without affecting other items This was a great exercise in understanding how to handle time-based state and side effects in React. Concept inspiration from learning resources by Akshay Saini 🚀 NamasteDev.com. Demo 👇 #ReactJS #FrontendDevelopment #JavaScript #BuildInPublic #WebDevelopment

One of the most underrated JavaScript concepts I have come across is microtask starvation. Most of us know that promises run before things like setTimeout. That part is simple. But the interesting part is what happens when you keep adding microtasks continuously. ```js function loop() { Promise.resolve().then(loop); } loop(); setTimeout(() => { console.log("This will never run"); }, 0); ``` What is happening here? Every time the microtask runs, it schedules another one. The event loop keeps clearing microtasks and never moves to the macrotask queue. Result: setTimeout never runs UI updates can get blocked The app can feel frozen without clear errors The real takeaway is this Microtasks do not give control back to the event loop easily. If you use them carelessly in recursive patterns, you can block everything else. In some cases, it is actually better to use setTimeout or similar approaches to let the system breathe. This is not something you see often in tutorials, but it can quietly cause real production issues. #JavaScript #EventLoop #Frontend #WebPerformance

Built a small frontend project — a Gradient Generator 🎨 Focused on improving my understanding of DOM manipulation, event handling, and dynamic UI updates using JavaScript. ⚙️ Features: • Random gradient generation • Direction control • Live preview • One-click copy 🌐 Live Demo: https://lnkd.in/gcQSkiWS 📂 GitHub: https://lnkd.in/g8H34Ped A simple build, but a good step forward in strengthening fundamentals. #webdevelopment #frontend #javascript

💬 I Built a Chat App using JavaScript! No frameworks. No libraries. Just pure JavaScript 👨💻 As part of my learning journey, I created a simple chat application where users can send messages and see them instantly on the screen. ✨ What it does: Takes user input Displays messages dynamically Updates UI in real-time 🛠️ Tech Used: HTML | JavaScript 💡 What I learned: DOM Manipulation Event Handling How real-time updates work Small steps, but big learning 🚀 🔗 GitHub: https://lnkd.in/da-AcBPW #JavaScript #WebDevelopment #Frontend #BuildInPublic #LearningJourney

💡 Mastering Closures in JavaScript! Today I explored one of the most powerful concepts in JavaScript — Closures 🔥 Built a small utility function makeTextSizer() that dynamically changes font size using closures. The inner function remembers the size even after the outer function has executed — and that’s the magic! ✨ 🧠 Key Learnings: 🛠️ Example use case:Click a button → dynamically update UI → clean & efficient code This is why JavaScript feels so powerful once you understand what’s happening behind the scenes. 🚀 On to deeper concepts next! #JavaScript #WebDevelopment #Frontend #Closures #CodingJourney #LearnInPublic #100DaysOfCode