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Javascript

93 articles on Javascript — each with a runnable playground and a quiz.

Articles

CSS

CSS has no native scoping. @scope changes that.

Jul 31 · 5 min JavaScript

Array methods are eager. Iterator helpers are lazy. Here's why that matters.

Jul 30 · 5 min CSS

You reach for Sass to mix colors. color-mix() does it natively.

Jul 29 · 4 min CSS

You hand-edit headlines to avoid orphaned words. text-wrap: balance does it natively.

Jul 28 · 4 min JavaScript

You're watching window to detect element size changes. ResizeObserver watches the element itself.

Jul 26 · 4 min CSS

You use a setTimeout to trigger CSS entry animations. @starting-style makes it unnecessary.

Jul 25 · 4 min TypeScript

You still write finally { resource.close() }. The using keyword does it automatically.

Jul 24 · 4 min JavaScript

You've been doing Set math by hand. JavaScript finally shipped .union(), .intersection(), and friends.

Jul 23 · 4 min JavaScript

You keep escaping the Promise constructor. Promise.withResolvers does it right.

Jul 22 · 4 min JavaScript

You're rethrowing errors and losing context. Error.cause fixes that.

Jul 21 · 4 min TypeScript

TypeScript Generics: The Complete Guide (with Cheat Sheet)

Jul 20 · 15 min JavaScript

Your scroll listener fires on every pixel. IntersectionObserver fires when visibility actually changes.

Jul 19 · 4 min
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