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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 LocksAPI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

We get the type number in response. Since something is a number,logic suggests we can perform mathematical operations onit. So let’s try adding something toit or checkingits maximum or minimum value.

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 togo back 30 years to the originalJavaScript

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 thanit was worth. But that’s changing.JavaScript now has native support for grouping data with Object.groupBy() andMap.groupBy(). These static methods make grouping expressive, concise, and far more readabl

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(

I recently discovered that you could make PS2 games inJavaScript. 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 fromitch.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 inJavaScript

Even if you’ve been doingJavaScript 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 theMicrosoft Edge team,it was explained to me that browsers did this to avoid “a

In thisblog post, we discussOracle’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,

Internationalization isn’tjust 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, modernJavaScript offers the IntlAPI — a powerful, native way to handle i18n. A quiet reminder that the web truly is worldwide.It’s a common misconception that internationalization (i18n) issim

Post contents I dunno about you, but I'm sick of hearing peopleobsessed with functionalprogramming talking about "monads". Like, I've been an engineer for years and never understood them. And I've seen monads explained in abunch of different ways: Visually In a 15 minute YouTube video Explored in 4 differentprogramming languages Compared to burritos Visually compared to burritos As the memable

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 NotifyAPI 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

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 aJavaScript Basado enJavaScriptEsJS aprovecha todo el potencial deJavaScript, uno de los lenguajes de programación más utilizados en el mu

Best performancees-toolkit delivers 2-3× better performance in modernJavaScript runtimes compared to other libraries. Smallbundle footprintes-toolkit ships up to 97% lessJavaScript code compared to other alternative libraries.