4 minbeginner
Debounce vs Throttle — One Sentence to Remember Forever
Two patterns for taming fast events: debounce waits for silence, throttle limits how often. With examples, code, and interview answers.
Bite-sized JavaScript, React & Next.js tips.
Short posts with code and diagrams. Readable in minutes.
CORS Explained Simply — Why Your Fetch Works in Postman but Fails in the Browser
Cross-Origin Resource Sharing in plain language: what blocks your request, what preflight means, and how to fix the errors you'll see in every frontend job.
6 min#cors
Read →5 minbeginner
?? vs || — The Default-Value Trap That Breaks Real Apps
`||` treats 0 and '' as missing. `??` only treats null/undefined as missing. Know the difference before it bites you in an interview or in prod.
6 minintermediate
React useEffect Dependencies — The Bug That Keeps Coming Back
Why your effect reads old state, fires twice, or loops forever — and the simple rules to fix it (interview-ready).
3 min
JavaScript Generators & Iterators — Lazy Sequences Explained
Generators let you produce values on demand instead of all at once. Learn how iterators and generator functions work, and when to reach for them.
3 minintermediate
React memo vs useMemo vs useCallback — When to Use Which
Three React APIs that all say 'memoize' — but they do different things. Clear explanations, examples, and a cheatsheet.
3 minintermediate
CDN Explained: What It Is, How It Works, and How to Use It in Next.js
A CDN speeds up your app by serving assets from servers close to your users. Here's how it works and how Next.js takes advantage of it.