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.
Bite-sized JavaScript, React & Next.js tips.
Short posts with code and diagrams. Readable in minutes.
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 min#javascript
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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.
1 minintermediate
queueMicrotask Explained: The Smallest Async Queue in JavaScript
What queueMicrotask does, how it differs from Promise.then, and how microtasks really work under the hood.
3 minintermediate
Why async/await Doesn’t Make JavaScript Code Parallel
Async/await feels like parallel code, but it isn’t. Here’s why JavaScript is still single-threaded and how async really works.
2 minintermediate
How Promise.all Works in a Single-Threaded JavaScript World
If JavaScript is single-threaded, how can Promise.all handle multiple requests at the same time? A deep dive into the event loop and async I/O.
3 minintermediate
Promise APIs Compared: all vs race vs any vs allSettled
A practical and conceptual comparison of Promise.all, Promise.race, Promise.any, and Promise.allSettled.