Managing Side Effects: A JavaScript Effect System in 30 Lines or Less
Managing Side Effects: A JavaScript Effect System in 30 Lines or Less If you look at the source code of a typical application, you will likely find business logic tangled with database calls, HTTP requests firing off in the middle of validation rules, and try/catch blocks sprinkled here and there. The biggest casualty of this coupling is testability. How do you test a function that calculates a us
Error chaining in JavaScript: cleaner debugging with Error.cause - Matt Smith
Use JavaScript's 'cause' property to chain errors, preserve context, and simplify debugging. Cleaner stack traces, better test assertions.
JavaScript engines zoo
Engine Score Binary LOC Language JIT Years Target ES1-5 ES6 ES2016+ Stars Contributors Org License Description
Web Locks APIでマルチタブのアクセストークン更新競合を防ぐ【AI生成】
この記事は生成AI（Claude Code）が書いた記事です。前回のAI生成記事の試みから、さらに投稿者（人間）の文体を学習させ、投稿者の記事に近いスタイルになったので、その成果発表でもあります。 前回同様、投稿者が自分で書いた記事に比べると至らない点はあるものの、技術記事としての妥当性については投稿者が責任を負うものです。 ただし、筆者の経験（社内のダッシュボードアプリケーションとか）については完全にAIによる捏造である点はあらかじめご了承ください。 皆さんこんにちは。最近、SPAアプリケーションでアクセストークンの定期更新を実装する際に、マルチタブ環境でのトークン更新の重複という問題に遭遇しました。この記事では、Web Locks APIを使ってこの競合を防ぐ方法を紹介します。 問題：マルチタブでのトークン更新の重複 SPAアプリケーションでは、ユーザーがアプリケーションを開いている間
Why typeof null === object
You can notice that the high bits are responsible for defining the data type, and the low bits for the payload or the address of the allocated object on the heap. So in this case, our true/false is represented in binary as 1/0. You’re probably wondering what this has to do with typeof null returning object instead of null. To understand this, we need to go back 30 years to the original JavaScript
How to group arrays in JavaScript without reduce() - Matt Smith
Front-end developers frequently transform arrays: filtering, mapping, reducing. And sometimes grouping. Grouping used to require custom reduce() logic, which often felt like more boilerplate than it was worth. But that’s changing. JavaScript now has native support for grouping data with Object.groupBy() and Map.groupBy(). These static methods make grouping expressive, concise, and far more readabl
Homepage » Jeasx - JSX with Ease
The Ease of JSX with the power of SSR The developer experience of asynchronous JSX with the proven benefits of server-side rendering, resulting in a robust and streamlined web development approach. export default async function ({ request, reply }) { const id = request.query["id"]; const { name, ingredients, instructions, image } = await ( await fetch(`https://dummyjson.com/recipes/${id}`) ).json(
You Can Now Make PS2 Games in JavaScript
I recently discovered that you could make PS2 games in JavaScript. I’m not even kidding, it’s actually possible. I was working on a project and had my phone near my desk when I received a notification. Upon further inspection, it came from itch.io which was a platform where I usually published most of my web games. Under my relatively popular Sonic infinite runner game which was made in JavaScript
Why do browsers throttle JavaScript timers?
Even if you’ve been doing JavaScript for a while, you might be surprised to learn that setTimeout(0) is not really setTimeout(0). Instead, it could run 4 milliseconds later: const start = performance.now() setTimeout(() => { // Likely 4ms console.log(performance.now() - start) }, 0) Nearly a decade ago when I was on the Microsoft Edge team, it was explained to me that browsers did this to avoid “a
JavaScript’s trademark problem
In this blog post, we discuss Oracle’s trademark of the word “JavaScript”: What are the problems caused by that trademark? How can we fix those problems? Oracle has a trademark for the word “JavaScript” # Oracle inherited the trademark for the word “JavaScript” from Sun Microsystems, along with a trademark for “Java”. What does that mean? “[...] using the word “JavaScript” to describe your work,
The Power Of The Intl API: A Definitive Guide To Browser-Native Internationalization — Smashing Magazine
Internationalization isn’t just translation. It’s about formatting dates, pluralizing words, sorting names, and more, all according to specific locales. Instead of relying on heavy third-party libraries, modern JavaScript offers the Intl API — a powerful, native way to handle i18n. A quiet reminder that the web truly is worldwide. It’s a common misconception that internationalization (i18n) is sim
Monads explained in JavaScript
Post contents I dunno about you, but I'm sick of hearing people obsessed with functional programming talking about "monads". Like, I've been an engineer for years and never understood them. And I've seen monads explained in a bunch of different ways: Visually In a 15 minute YouTube video Explored in 4 different programming languages Compared to burritos Visually compared to burritos As the memable
命令的な ARIA ライブリージョン：ARIA Notifyの紹介
こんにちは、フロントエンドエンジニアの mehm8128 です。 今回は新しく検討されている ARIA Notify API について紹介します。 ARIA Notify とは ARIA Notify とは、既存の ARIA ライブリージョンにおける問題点を基に検討されている、新しい API です。document.ariaNotify() のように命令的に呼び出すことで、スクリーンリーダーや点字ディスプレイなどの支援技術に情報を伝えることができます。 ただし、既存のライブリージョンを完全に置き換えるものではありません。本来の目的で利用されているライブリージョンはそのままで良く、意図しない用いられ方をしてしまっている部分で、より正確に支援技術に情報を通知するための API となっています。 現在は仕様の議論段階で、最低限の機能が入った API が Edge では 136 以降の Origi
EsJS: JavaScript con sintaxis en Español
Sintaxis en EspañolEsJS es ideal para personas hispanohablantes que quieren comenzar a programar, ya que las instrucciones están escritas en Español MultiplataformaEsJS puede ser utilizado tanto del lado del Servidor como del Cliente, gracias a su conversión a JavaScript Basado en JavaScriptEsJS aprovecha todo el potencial de JavaScript, uno de los lenguajes de programación más utilizados en el mu
es-toolkit
Best performancees-toolkit delivers 2-3× better performance in modern JavaScript runtimes compared to other libraries. Small bundle footprintes-toolkit ships up to 97% less JavaScript code compared to other alternative libraries.
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GitHub - yarlson/vite-plugin-use-golang
Why NaN !== NaN in JavaScript (and the IEEE 754 story behind it)
I want to intercept Boolean Coercion for Objects in JavaScript—zachleat.com
fp-filters - v0.5.5
Faceclick: A lightweight Emoji picker with keyword search - ratfactor