Quokka - JavaScript and TypeScript playground in your editor
Quokka.js runs JavaScript and TypeScript with instant feedback. Runtime values are updated and displayed in your editor next to your code, as you type. Quokka makes exploring, learning, and testing JavaScript / TypeScript blazingly fast. By default no config is required, simply open a new Quokka file and start experimenting. Focus on writing code instead of writing bespoke config files just to try
Things I Don’t Know as of 2018 — overreacted
Things I Don’t Know as of 2018December 28, 2018 People often assume that I know far more than I actually do. That’s not a bad problem to have and I’m not complaining. (Folks from minority groups often suffer the opposite bias despite their hard-earned credentials, and that sucks.) In this post I’ll offer an incomplete list of programming topics that people often wrongly assume that I know. I’m not
Introducing Ezno
Introducing EznoPublished on Thursday 22nd September 2022 Ezno is an experimental compiler I have been working on and off for a while. In short, it is a JavaScript compiler featuring checking, correctness and performance for building full-stack (rendering on the client and server) websites. This post is just an overview of some of the features I have been working on which I think are quite cool as
Index as a key is an anti-pattern
So many times I have seen developers use the index of an item as its key when they render a list. { todos.map((todo, index) => <Todo {...todo} key={index} />); } It looks elegant and it does get rid of the warning (which was the ‘real’ issue, right?). What is the danger here? It may break your application and display wrong data! Let me explain, a key is the only thing React uses to identify DOM el
敗北者のTypeScript - Qiita
TypeScriptはJavaScriptに静的型を導入したプログラミング言語で、登場から現在までその人気を増し続けています。 動的型付き言語であるJavaScriptに静的型の安全性（コンパイル時にバグ・間違いを発見することができる能力）を与えることで、TypeScriptはJavaScriptによる開発の効率を上げてくれます。 裏にJavaScriptがあるという特性もあり、TypeScriptは「部分的に静的型チェックをする」というような挙動をサポートしています1。詳しくは後述しますが、これによりJavaScriptからTypeScriptへの移行が可能となっています。TypeScriptは@ts-check（あるいは@ts-ignore）などを通じてこのようなユースケースも手厚くサポートしています。 このことの裏返しとして、TypeScriptを利用するときは注意すべき点があります
tsconfig.jsonはJSONじゃないと言う話 - 焼売飯店
気になったので調べてみました。 tsconfig.jsonと普通のJSONの大きな違い tsconfig.jsonには、コメントが書けます。 tsc --init した時に生成されるtsconfig.jsonに、大量にコメントが付けられているので、すぐに気付くことと思います。 例) { "compilerOptions": { "target": "es5" /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019', 'ES2020', or 'ESNEXT'. */, "module": "commonjs" /* Specify module code generation: 'none', 'commonjs', 'amd
Announcing Scala.js 1.0.0
Feb 25, 2020. We are thrilled to announce the General Availability release of Scala.js 1.0.0! Scala.js is a close dialect of Scala compiling to JavaScript, featuring great portability wrt. Scala/JVM, interoperability with JavaScript, and performance. After 7 years of development, including 5 years of stability within the 0.6.x series, we are finally ready to present Scala.js 1.0.0. Quoting Antoine
Start TypeScript Leaving JavaScript as JS
https://jsconf.jp/2019/talk/ginpei-takanashi
Folding the DOM • Josh W. Comeau
Filed underReactoninMay 19th, 2019.May 2019.Last updatedoninSeptember 13th, 2024.Sep 2024. IntroductionIn my day-to-day life as a front-end developer, I generally treat CSS as a collection of 2D layers. Other than reordering them using z-index, I don't often move things in 3D space. And yet, for years now, browsers have bundled in a surprisingly capable 3D CSS engine! Someone even built an experim
GitHub - stutrek/scrollmonitor: A simple and fast API to monitor elements as you scroll
The scroll monitor allows you to receive events when elements enter or exit a viewport. It does this using watcher objects, which watch an element and trigger events. Watcher objects also contain information about the element they watch, including the element's visibility and location relative to the viewport. If your scroll container is an element other than the body you can create a container th
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An experimental data-flow analysis tool for front-end JavaScript
What is FromJS? FromJS shows you where each value in the DOM comes from. For example, some data might have been loaded using fetch, some might have been stored in localStorage, and some might have been hard-coded in the JavaScript code. Try FromJS I've not worked on this for a while and it never worked super well, so maybe you shouldn't actually try it :) Install from NPM: npm install -g @fromjs/c
Responsive Components: a Solution to the Container Queries Problem — Philip Walton
Now all we have to do is ensure our container elements always have the right breakpoint classes on them, so the correct component selectors will match. Observing container resizesFor most of web development history, it’s been possible to observe changes to the window, but it’s been hard or impossible (at least in a performant way) to observe size changes to individual DOM elements. This changed wh
Metaballs
Metaballs, not to be confused with meatballs, are organic looking squishy gooey blobs. From a mathematical perspective they are an iso-surface. They are rendered using equations such as f(x,y,z) = r / ((x - x0)2 + (y - y0)2 + (z - z0)2). Jamie Wong has a fantastic tutorial on rendering metaballs with canvas. We can replicate the metaball effect using CSS & SVG by applying both blur and contrast fi
Bundlephobia | Size of npm dependencies
What does Bundlephobia do? JavaScript bloat is more real today than it ever was. Sites continuously get bigger as more (often redundant) libraries are thrown to solve new problems. Until of-course, the big rewrite happens. Bundlephobia lets you understand the performance cost ofnpm install ing a new npm package before it becomes a part of your bundle. Analyze size, compositions and exports Credits
You Might Not Need Redux
People often choose Redux before they need it. “What if our app doesn’t scale without it?” Later, developers frown at the indirection Redux introduced to their code. “Why do I have to touch three files to get a simple feature working?” Why indeed! People blame Redux, React, functional programming, immutability, and many other things for their woes, and I understand them. It is natural to compare R
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GitHub - formkit/tempo: 📆 Parse, format, manipulate, and internationalize dates and times in JavaScript and TypeScript.
Tempo • Dates by FormKit
Explore DOM Events
WorkerDOM: Concurrency for JavaScript programming with the DOM
