JavaScript

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JavaScript Advanced

Make Any Object Spreadable: Symbol.iterator in Practice

for...of, spread, destructuring and Array.from all speak one protocol. Implement one method and your own classes join Map, Set and NodeList as first-class iterables.

Feb 9, 2025 2 min 1,533 Read →

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JavaScript Advanced

A 15-Line Proxy That Tells You Exactly What Changed

Dirty checking, undo history, "unsaved changes" warnings - all reduce to knowing when an object changed. Proxy intercepts the writes themselves, no framework needed.

Feb 1, 2025 2 min 1,617 Read →

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JavaScript Advanced

WeakMap: Attach Data to DOM Elements Without Leaking Memory

Store state against DOM nodes, cache per-object computations, keep private data - WeakMap does all three and lets the garbage collector clean up behind you.

Jan 28, 2025 2 min 1,063 Read →

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JavaScript Advanced

for await...of: Paginated APIs as a Simple Loop

Async generators hide the pagination bookkeeping - cursors, hasMore flags, page counters - behind a clean loop that fetches pages only as you consume them.

Jan 22, 2025 2 min 1,640 Read →

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JavaScript Intermediate

Promise.allSettled, any, race: Picking the Right Combinator

Promise.all fails everything when one request dies - usually not what a dashboard wants. The other three combinators cover the cases all() gets wrong.

Jan 13, 2025 2 min 572 Read →

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JavaScript Beginner

toSorted() and Friends: Arrays That Stop Mutating Under You

sort() silently rearranges the original array - a bug factory in shared state. ES2023 shipped non-mutating twins for the worst offenders, plus with() for single-item replacement.

Jan 3, 2025 2 min 1,108 Read →

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JavaScript Beginner

Array.from({ length }) Is JavaScript's Missing range()

Python has range(), PHP has range() - JavaScript has a weird-looking idiom that does the same and more, once you understand why the mapping callback is built in.

Dec 24, 2024 2 min 2,847 Read →

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JavaScript Beginner

??=, ||= and &&=: The Assignment Operators Nobody Told You About

ES2021 added three assignment operators that collapse the most common if-statements in JavaScript. Knowing when ??= beats ||= is the part that matters.

Dec 17, 2024 2 min 2,312 Read →

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PHP Intermediate

A Real Upload Progress Bar with XMLHttpRequest and PHP

fetch() still cannot report upload progress reliably - but XMLHttpRequest has done it for fifteen years. The full pattern: progress events, a PHP receiver, and the config limits that silently break big uploads.

Dec 8, 2024 2 min 2,906 Read →

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JavaScript Beginner

Why Your Click Handlers Die After AJAX (and the One-Line Fix)

Buttons work until the list refreshes over AJAX, then silently stop. Delegated events fix it permanently - and the same pattern is two lines in vanilla JS.

Nov 19, 2024 2 min 2,390 Read →

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PHP Advanced

Real-Time Updates with Plain PHP: Server-Sent Events

WebSockets need infrastructure. Polling hammers your server. SSE streams live updates over normal HTTP with a PHP file and the built-in EventSource API - reconnection included.

Nov 10, 2024 2 min 1,843 Read →

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PHP Intermediate

window.onerror + 20 Lines of PHP = Your Own Error Tracker

Users almost never report the JavaScript errors they hit. A global error handler, sendBeacon and a tiny PHP endpoint give you a self-hosted crash log for free.

May 22, 2024 2 min 3,104 Read →