The Leaderboard That Ranked 9 Points Above 100
Why JavaScript's sort() compares numbers as strings, why a 'lazy' comparator works in Safari but breaks in Chrome, and the one-line fix.
5 min read3
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.
4 min read
?? 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.
5 min read1
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 read
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.
1 min read
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.
3 min read
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.
2 min read1
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.
3 min read
Web Workers Explained for Frontend Developers
How Web Workers work, why they matter, and when to use them to achieve real parallelism in frontend apps.
3 min read
BroadcastChannel API in JavaScript
How to communicate between browser tabs, windows, or iframes easily using the BroadcastChannel API.
3 min read
Deep Copy vs Shallow Copy in JavaScript
Understand the difference between shallow and deep copies, with examples and pitfalls.
2 min read1
AbortController & AbortSignal
Everything you need to cancel async work in JS: fetch, streams, custom tasks, React patterns, Node notes, timeouts, races, and common pitfalls.
4 min read
JavaScript Closures — A Simple Deep Dive
What closures are, how they work (lexical scope), and how to use them without pitfalls.
5 min read
JavaScript Promises Explained
A simple but deep dive into how Promises work in JavaScript and why they matter.
2 min read
JavaScript is Single-Threaded
Understand what it means when people say JS is single-threaded.
2 min read
JavaScript Event Bus 🚍 (JS + TypeScript)
A polished, practical event bus pattern with minimal JS, a strongly-typed TS version, wildcards, once-handlers, and React usage tips.
4 min read
JavaScript's Event Loop — Simple Guide (with SVG Timeline)
Event loop explained with a clean SVG timeline showing the actual execution order: Start → End → Promise → Timeout.
1 min read
Microtask vs Macrotask in JavaScript — With Node.js vs Browser Notes
Understand microtasks and macrotasks across browsers and Node.js, including process.nextTick, setImmediate, and event loop phases.
3 min read
Event Bubbling vs Event Capturing in JavaScript
Understand how events travel through the DOM: bubbling (bottom-up) vs capturing (top-down) with simple examples and mental models.
1 min read
Async vs Sync in JavaScript
Understand the difference between synchronous and asynchronous code in JavaScript with simple examples and analogies.
1 min read