JavaScript

From data pagination to batching API calls, splitting arrays into chunks is one of those timeless problems every developer solves again and again. Here’s how to do it cleanly. Introduction You’ve got a huge array, and you don’t want to process it all at once. Maybe you’re: This is where chunking comes in — splitting arrays into smaller,…

Why JavaScript’s most misunderstood array method is secretly your Swiss Army knife for transforming data, not just adding it up. Introduction Ask most developers what reduce is for, and you’ll probably hear: “summing an array of numbers.” And yes, that’s the canonical example. But here’s the thing: reduce is way more powerful. It can build objects,…

Beyond the basics — hidden patterns, defaults, renaming, dynamic keys, and real-world destructuring hacks every JavaScript developer should master. Introduction JavaScript destructuring looks simple: const { name, age } = user; But that’s just scratching the surface. Destructuring is more than a shorthand — it’s a pattern-matching superpower baked into the language. It lets you: This article goes beyond the…

How to pair, combine, transpose, and stream arrays — without Lodash — using clean, reusable utilities (with TypeScript, iterables, and async support). Introduction You’ve got two arrays — keys and values, headers and rows, labels and inputs — and you need to pair items by position. That’s “zipping.” Think of it like a jacket zipper: tooth-to-tooth alignment across two tracks. Most devs reach…

Why arrays with “holes” behave weirdly, how they differ from undefined, and what every developer should know before they bite you in production. Introduction Here’s a fun one: const arr = [1, , 3];console.log(arr.length); // 3console.log(arr[1]); // undefinedconsole.log(1 in arr); // false 🤯 Wait, what? The array says it has length 3, the second slot…