Debouncing vs Throttling: Debounce for Inputs, Throttle for UI

Scroll events giving you headaches? 😩 There's a better way. The Intersection Observer API lets you detect when elements enter the viewport — no scroll listeners, no layout thrashing, just clean and efficient JS. ⚡ I just published a full breakdown with real code examples, tips, and common mistakes to avoid. 🔧 Read it now 👉 hamidrazadev.com #javascript #webdev #frontend #learntocode #100daysofcode

🚀 💡 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

spent the last week going deep into React to understand how rendering actually works under the hood. turned it into a video , tracing what happens between writing JSX and seeing pixels on screen. every step, from createElement to fiber nodes to the one appendChild call that makes the page appear. this is part 1 covering the initial render. part 2 on re-renders and reconciliation is coming next. link : https://lnkd.in/dycpqavw if you've ever wondered what the "virtual DOM" actually is (spoiler: it's just plain objects that get thrown away every render), this one's for you. #react #javascript #frontend #webdev

Why do we need the 𝘂𝘀𝗲𝗠𝗲𝗺𝗼 hook when we can perform heavy calculations inside 𝘂𝘀𝗲𝗦𝘁𝗮𝘁𝗲, which runs only once? The key difference is flexibility and reactivity. 𝘂𝘀𝗲𝗠𝗲𝗺𝗼 can run once or re-run when specific values change. It accepts two arguments: 1. A callback function 2. A dependency array You can pass values in the dependency array, and whenever any of those values change, React re-invokes the callback function. This ensures you always have the latest values inside the callback. Real-world use case: Validating edit form values on initial load and re-validating when certain conditions or inputs change. #ReactJS #FrontendDevelopment #JavaScript #WebDevelopment #ReactHooks #PerformanceOptimization #CodingTips

React Error Boundaries are basically try/catch for UI rendering. Without one, a single broken component can crash the whole screen. With an Error Boundary, React catches the failure and shows a fallback UI instead. Even better: with react-error-boundary, you can also handle async errors using showBoundary(). You can get example code from my blog: https://lnkd.in/gDYnB7h5 #React #Frontend #JavaScript #WebDevelopment

Important Frontend Concepts Checklist- 1. Pagination 2. Infinite Scrollbar 3. Debouncing 4. Websocket 5. REST vs GraphQI APIs 6. Local Storage vs Cookies 7. Authentication vs Authorization 8. Redux ( Or any other state management library) 9. Lazy Loading 10. Code Splitting 11. Bundle Size Optimization 12. Tree Shaking 13. Memoization (useMemo, useCallback) 14. Caching (Client + Server) 15. CSR vs SSR vs SSG vs ISR 16. Core Web Vitals (LCP, INP, CLS) 17. Cross Browser Compatibility 18. Optimistic UI Updates 19. Suspense (React) 20. Image Optimization (WebP, AVIF) 21. Accessibility (a11y) 22. Webpack 23. Micro-Frontend Architecture 24. Unit Testing 25. Polyfills, Babel #ReactDeveloper #FrontEnd #FrontEndDeveloper #Javascript #Angular #AngularDeveloper #react #Typescript

⚛️ Old vs New: Handling Loading States the Smarter Way ❌ Before React 19, managing loading states meant dealing with isLoading flags, conditional renders, and custom spinners everywhere. Too much boilerplate… for something we use all the time. ✅ With React 19, the new <Loading /> component changes everything. It works hand-in-hand with Suspense to handle async UI automatically while your components fetch data. ✨ Key Features: 🔄 Automatic Loading State Handling — No more manual flags ⚙️ Built-in with Suspense — Seamless integration with async components 🎨 Customizable UI — Swap <Loading /> with your own spinner or skeleton 🧠 Cleaner Code, Less Re-renders — More declarative, more efficient #react #webdev #frontend #javascript #reactjs #coding #softwareengineering #devtips #ReactTips

🧠 Day 13 of 21days challenge JavaScript Closures ⚠️ (Hidden Risk) Closures are powerful… but can cause memory leaks if not handled properly. When a function keeps reference to variables, those variables stay in memory even if not needed. For easy understanding :- Closure = function + retained memory Unused references stay in memory Can lead to memory leaks 👉 That’s why improper closures can impact performance This changed how I write functions 🚀 #JavaScript #Closures #InterviewPrep #Frontend

I built a Pomodoro timer into ACE and honestly it's been one of those features I didn't know I needed until I had it. The idea was simple. I was using ACE to study and kept switching tabs to find a timer. So I just built one in. 25 minutes. Focus. Break. Repeat. If you're building something, don't sleep on the small features. Sometimes the thing that makes your product actually usable isn't the AI or the fancy architecture. It's the 25 minute timer sitting quietly in the corner. #buildinpublic #nextjs #webdevelopment #javascript #frontenddevelopment

What is a closure in JavaScript? A closure is a function that remembers variables from its outer scope even after that scope has finished executing. Why does this work? - `createCounter` runs once - It creates a variable `count` - The inner function “closes over” that variable - Even after `createCounter` finishes, `count` is still accessible Each time `counter()` runs: → it uses the same preserved state 💡 Closures are everywhere: - React hooks - Event handlers - Memoization - Encapsulation patterns They’re not just a concept — they’re part of how JavaScript manages state. #Frontend #JavaScript #React #WebDevelopment #SoftwareEngineering