JavaScript で then を使うのは避けよう（await / async の初級者まとめ）
JavaScript において、特に苦手とする人が多い印象のある Promise ですが、await と async の文法が導入されたことで、Promise の仕様を深く理解しなくても非同期処理を自然に書けるようになってきたのではないかと思います。 極論ですが、JavaScript の非同期処理は async await new Promise のみで、（ほぼ）全て表現可能です。特別な理由がない限り then を使わないようにしましょう、ということを周知するのがこの記事の目的です。 なお本記事では Promise の rejected の状態についてほとんど解説しておりません。基本を理解したら、別記事でぜひ学んでみてください。 Promise とは？ Promise は、少し乱暴に説明すると「実行が終わっていないかもしれない何らかの関数」を包んだオブジェクトです。 普通の関数とは違って、
JavaScript Visualized - Promise Execution
Promises in JavaScript can seem a bit daunting at first, but understanding what's happening under the hood can make them much more approachable. In this blog post, we'll dive deep into some of the inner workings of promises and explore how they enable non-blocking asynchronous tasks in JavaScript. I'm still working on making this blog better on mobile devices, mobile browsers don't always render t
WebSockets vs Server-Sent-Events vs Long-Polling vs WebRTC vs WebTransport | RxDB - JavaScript Database
For modern real-time web applications, the ability to send events from the server to the client is indispensable. This necessity has led to the development of several methods over the years, each with its own set of advantages and drawbacks. Initially, long-polling was the only option available. It was then succeeded by WebSockets, which offered a more robust solution for bidirectional communicati
「JavaScriptで要素をドラッグして移動する簡単な方法」という記事が初耳だらけだった件 - Qiita
はじめに まず↓の記事を見てない方はぜひ見てください！ 自分にとってはこの記事には「えっ、ナニコレ！」なテクニックが多く、特に解説もなかったのでいろいろ調べてたら休日が消えてました... なのでその時間の供養もかねて、自分が知らなかった部分を中心に、僭越ながら元記事の解説を書いてみたいと思います。 ちなみに、以下が元記事のコードそのままを実装したものです。たしかに掲載コードだけで要素がグリグリ動きますね。 See the Pen js-drag-move-original by www-tacos (@www-tacos) on CodePen. 初耳1: $img まずコードのここ <img id="$img" src="https://js.cx/clipart/ball.svg" width="40" height="40"> <script> $img.onpointermove
HTMX vs React: A Complete Comparison - Semaphore
The ultimate goal of HTMX is to provide modern browser interactivity directly within HTML, without the need for JavaScript. Although relatively new, with its initial release in late 2020, this frontend library has quickly caught the attention of the IT web community. With 2nd place in the 2023 JavaScript Rising Stars “Front-end Frameworks” category (right behind React), a spot in the GitHub Accele
Pagefind | Pagefind — Static low-bandwidth search at scale
Pagefind is a fully static search library that aims to perform well on large sites, while using as little of your users’ bandwidth as possible, and without hosting any infrastructure. Pagefind runs after Hugo, Eleventy, Jekyll, Next, Astro, SvelteKit, or any other website framework. The installation process is always the same: Pagefind only requires a folder containing the built static files of yo
Free and Open source PDF generator library! | pdfme
"content": "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAZ4AAAKFCAMAAADLW3/4AAAABGdBTUEAALGPC/xhBQAAAAFzUkdCAK7OHOkAAADDUExURfLx8N7b2eLg3+7k2ero5+bl4/Do3e3r6vDw7+/u7PHr4ezh1c3LysjGxune0cLBw/b08vPu5tnW1dPQz769v+bZy9jNwtDEuuHa0ratp+LTxLe3uvby6sO4sObg2Orl3t3Uy6utsbazss68rayinXxiVaKYk5WMiLWZg5d5ZYhvYN/MuqWBacaxobKOc4qAemxXTbyml/bm06WJd9rDrsSli6OkqIFQRdS0mGlKOldCOJhSRY9oVfTdxEYvJCkYD8iadvAoFyAAACAASU
Unleash JavaScript's Potential
Unleash JavaScript's Potential with the UnJS EcosystemAgnostic Excellence: JavaScript Libraries, Tools, and Utilities, Crafted to Elevate Your Coding Journey. A unified JavaScript ecosystem The UnJS PhilosophyA robust ecosystem, driven by the UNIX Philosophy, housing purpose-built, high-quality JavaScript utilities, libraries, and tools, upheld by a collaborative community. High-quality & Single-P
UnJS にどんなツールがあるのか、上位30件すべて紹介してみた
タイトル通り、JavaScriptツール群「UnJS」にどんなライブラリが存在するのかをひたすら見てみよう！ という記事です。 本当は全て紹介しようと思ったのですが、全75個あり、1つの記事に入れるとあまりにも多すぎるので、この記事では2023年11月4日時点のStar数の順に沿って上位30個を紹介していきます。 UnJS とは UnJSは、Nuxt 開発チームが中心となって開発・メンテナンスされている、あらゆるJavaScriptフレームワーク上で統一的に動作するユーティリティーツール・ライブラリ群です。 UnJSというプロジェクトが何であるかについては、2022年11月に公開された講演映像「UnJS: Nuxt 3 behind the scenes by Pooya Parsa」を観て頂くのが最もわかりやすいと思います。Nuxt 3 正式リリース直後ということもあって、かなり詳細な背
Nue - Web Framework For UX Developers
At some point in the last decade, popular frameworks and platforms have eschewed semantic markup, and, as a result, the web has become way more bloated than it ever needed to be. Stripping away presentational markup and unreadable CSS is something all web developers once believed in. I'm glad Nue is bringing back that power. Elliot Jay Stocks / Legendary designer and UX developer @snowcode I'm tot
Muuri - Infinite layouts with batteries included
what & why? Muuri creates responsive, sortable, filterable and draggable layouts. Comparing to what's out there Muuri is a combination of Packery, Masonry, Isotope and Sortable. You can build pretty amazing layouts without a single line of JavaScript these days. However, sometimes (rarely though) CSS just isn't enough, and that's where Muuri comes along. At it's very core Muuri is a layout engine
clipboard.js
Why Copying text to the clipboard shouldn't be hard. It shouldn't require dozens of steps to configure or hundreds of KBs to load. But most of all, it shouldn't depend on Flash or any bloated framework. That's why clipboard.js exists. Install You can get it on npm. npm install clipboard --save Or if you're not into package management, just download a ZIP file. Setup First, include the script locat
FullCalendar - JavaScript Event Calendar
npm install @fullcalendar/angular import { Component } from '@angular/core' import { CalendarOptions } from '@fullcalendar/angular' @Component({ selector: 'app-root', templateUrl: './app.component.html', styleUrls: ['./app.component.scss'] }) export class AppComponent { calendarOptions: CalendarOptions = { initialView: 'dayGridMonth', events: [ { title: 'event 1', date: '2019-04-01' }, { title: 'e
chroma.js api docs!
chroma.js chroma.js is a small-ish zero-dependency JavaScript library (13.5kB) for all kinds of color conversions and color scales. Installation For Node.js: Install the chroma-js npm module, npm install chroma-js. Then import the module into your JavaScript: import chroma from "chroma-js". And for browsers, download chroma.min.js or use the hosted version on cdnjs.com. Then, initiate and manipula
Alpine.js
<script src="//unpkg.com/alpinejs" defer></script> <div x-data="{ open: false }"> <button @click="open = true">Expand</button> <span x-show="open"> Content... </span> </div> { let keys = Object.keys(steps) direction = keys.indexOf(value) > keys.indexOf(old) ? 'right' : 'left' })" > Alpine is a rugged, minimal tool for composing behavior directly in your markup. Think of it like jQuery for the mode
リリース、障害情報などのサービスのお知らせ
最新の人気エントリーの配信
j次のブックマーク
k前のブックマーク
lあとで読む
eコメント一覧を開く
oページを開く
Testing Library | Testing Library
GitGraph.js
TOAST UI :: Make Your Web Delicious!
GitHub - SortableJS/Sortable: Reorderable drag-and-drop lists for modern browsers and touch devices. No jQuery or framework required.
TypeORM - Amazing ORM for TypeScript and JavaScript (ES7, ES6, ES5). Supports MySQL, PostgreSQL, MariaDB, SQLite, MS SQL Server, Oracle, WebSQL databases. Works in NodeJS, Browser, Ionic, Cordova and Electron platforms.