JavaScript engine fundamentals: Shapes and Inline Caches · Mathias Bynens
This article describes some key fundamentals that are common to all JavaScript engines — and not just V8, the engine the authors (Benedikt and Mathias) work on. As a JavaScript developer, having a deeper understanding of how JavaScript engines work helps you reason about the performance characteristics of your code. Note: If you prefer watching a presentation over reading articles, then enjoy the
Using JavaScript modules on the web  | Web Fundamentals  | Google Developers
JavaScript modules are now supported in all major browsers! Chrome: supported since version 61Firefox: supported since version 60Safari: supported since version 11Node.js: supported since version 13.2.0Babel: supported This article explains how to use JS modules, how to deploy them responsibly, and how the Chrome team is working to make modules even better in the future. What are JS modules? #JS m
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2018å¹´ã®JavaScriptã®ã‚³ãƒ¼ãƒ‰ãƒ•ã‚©ãƒ¼ãƒžãƒƒã‚¿ãƒ¼äº‹æƒ… - Qiita
2020/01/23追記: ã“ã‚Œã¯ã™ã§ã«å¤ã„æƒ…å ±ã§ã™ã€‚ESLintã¨Prettierã¯åŒæ™‚ã«ä½¿ã‚ãªã„ã®ãŒä»Šã®æŽ¨å¥¨è¨å®šã§ã™ã€‚最新ã®æƒ…å ±ã¯ä»¥ä¸‹ã®ã¨ã“ã‚ã«ã‚ã‚Šã¾ã™ã€‚ https://future-architect.github.io/typescript-guide/baseenv.html 以下ã¯éŽåŽ»ã®æƒ…å ±ã§ã™ PySpaçµ±åˆæ€å¿µä½“ã§ã™ã€‚ go fmt便利ã§ã™ã‚ˆã。è¨å®šãªã—ã§è¨€èªžãŒå®šã‚るルールã§ä¸€ç™ºã§ã‚„ã£ã¦ãれるã®ã§è‰¯ã„ã§ã™ã。ã§ã€JavaScriptã§ã¯æ´å²çš„経緯もã‚ã£ã¦ã€ãƒ•ã‚©ãƒ¼ãƒžãƒƒãƒˆã®æµæ´¾ã¯ã„ã‚ã„ã‚ã‚ã‚Šã¾ã™ã€‚ インデントã¯ã‚¹ãƒšãƒ¼ã‚¹2/4ã€ãƒãƒ¼ãƒ‰ã‚¿ãƒ– æ–‡å—列ã«ã¯ã‚·ãƒ³ã‚°ãƒ«ã‚¯ã‚ªãƒ¼ãƒˆä½¿ã†æ´¾ï¼ˆè‹±èªžã‚ーボードã ã¨ã‚·ãƒ•ãƒˆã‚ー押ã•ãªãã¦ã„ã„） 末尾ã®ã‚»ãƒŸã‚³ãƒãƒ³ã¯å¿…é ˆãƒ»çœç•¥ ãã®ãŸã‚カスタマイズå¯èƒ½ãªãƒ•ã‚©ãƒ¼ãƒžãƒƒã‚¿ãƒ¼ãŒå¿…è¦ã¨ãªã‚Šã¾ã™ã€‚カスタマイズã®æŸ”軟性やæ´å²çš„経緯や新ã—ã„文法ã¸ã®å¯¾å¿œãªã©ã§ã€ã„ãã¤ã‹ã®ãƒ„ー
Rough.js
Create graphics with a hand-drawn, sketchy, appearance Rough.js is a small (<9kB gzipped) graphics library that lets you draw in a sketchy, hand-drawn-like, style. The library defines primitives to draw lines, curves, arcs, polygons, circles, and ellipses. It also supports drawing SVG paths. Rough.js works with both Canvas and SVG. Install Install from npm: npm install --save roughjs And use it in
JavaScriptã®ãƒ¢ãƒ€ãƒ³ãªæ›¸ãæ–¹ - ES2017〜ES2018ã®await・async, includes(), padStart()ç‰ã‚’解説 - ICS MEDIA
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Maybe you don't need Rust and WASM to speed up your JS
Few weeks ago I noticed a blog post “Oxidizing Source Maps with Rust and WebAssembly†making rounds on Twitter - talking about performance benefits of replacing plain JavaScript in the core of source-map library with a Rust version compiled to WebAssembly. This post piqued my interest, not because I am a huge on either Rust or WASM, but rather because I am always curious about language features an
Modernizing Node.js with idiomatic JavaScript
This blog post was written by Peter Marshall, Software Engineer at Google, V8 and Arunesh Chandra, Sr. Program Manager at Microsoft, Chakra Until recently, it was hard to write JavaScript that worked across all browsers. The different JavaScript virtual machines found in each browser varied so much in their behavior that developers often put explicit checks in their code for each browser, and enti
Feature watch: ECMAScript 2018
Check out my book (free online): “Exploring ES2018 and ES2019â€. Buy it now and get all future updates. The feature set of ECMAScript 2018 was finalized during the latest TC39 meeting (23-25 January 2018). This blog post describes it. A word on ECMAScript versions  # Note that since the TC39 process was instituted, the importance of ECMAScript versions has much decreased. What really matters now is
Operator Overloading in JavaScript
Yep, we're talking about it Why have operator overloading at all? Useful for new proposed data types - BigInt, Decimal Operator support make these "look more like" first class data types Offers a set of well-understood base level semantics (`+` is better understood than `.plus`) C++, F#, Scala, Ruby, Haskell, & Rust all agree! Why have operator overloading at all? const a = 2n const b = 8n const c
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wavesurfer.js | audio waveform player JavaScript library
Wavesurfer.js is an open-source audio visualization library for creating interactive, customizable waveforms. ✨ Features HTML5 Audio and Web Audio support Responsive and customizable waveforms Highly extensible with plugins TypeScript API – see the documentation 🧑â€ðŸ’» Quick start <div id="waveform"> <!-- the waveform will be rendered here --> </div> <script type="module"> import WaveSurfer from 'h
How JavaScript works: Event loop and the rise of Async programming + 5 ways to better coding with…
Welcome to post # 4 of the series dedicated to exploring JavaScript and its building components. In the process of identifying and describing the core elements, we also share some rules of thumb we use when building SessionStack, a JavaScript tool for developers to identify, visualize, and reproduce web app bugs through pixel-perfect session replay. Did you miss the first three chapters? You can f
ES Modules入門 - JavaScriptã®ãƒ¢ã‚¸ãƒ¥ãƒ¼ãƒ«ã‚’使ã†æ–¹æ³• - ICS MEDIA
JavaScriptã«ã¯ã€ãƒ¢ã‚¸ãƒ¥ãƒ¼ãƒ«ã¨ã„ã†ä»•çµ„ã¿ãŒã‚ã‚Šã¾ã™ã€‚ECMAScript 2015ã®Modulesã«æ¨™æº–仕様ã¨ã—ã¦ç–定ã•ã‚Œã¦ãŠã‚Šã€ç¾åœ¨ã¯ã™ã¹ã¦ã®ãƒ–ラウザã§åˆ©ç”¨ã§ãã¾ã™ã€‚ã“ã®æ©Ÿèƒ½ã¯ã€ECMAScript Modulesã€ES Modulesã€ESMãªã©ã¨å‘¼ã°ã‚Œã¦ã„ã¾ã™ï¼ˆä»¥ä¸‹ã€ES Modulesã¨è¨˜è¼‰ã—ã¾ã™ï¼‰ã€‚ Viteã‚„webpackãªã©ã®ãƒ•ãƒãƒ³ãƒˆã‚¨ãƒ³ãƒ‰ã®ãƒ„ールを通ã—ã¦ã€ES Modulesを使ã£ã¦ã„るエンジニアã¯å¤šã„ã§ã—ょã†ã€‚本記事ã§ã¯ã€ãƒ–ラウザãƒã‚¤ãƒ†ã‚£ãƒ–ã§ä½¿ãˆã‚‹ES Modulesã«ç„¦ç‚¹ã‚’ã‚ã¦ã€ES Modulesã§è§£æ±ºã§ãる課題ã¨åˆ©ç‚¹ã‚’紹介ã—ã¾ã™ã€‚ HTML+JSã§ã¯ãƒ¢ã‚¸ãƒ¥ãƒ¼ãƒ«ã®ä»•çµ„ã¿ãŒãªã‹ã£ãŸ 昔（2010年代å‰åŠï¼‰ã®JavaScriptã«ã¯ä»–ã®JSファイルをå–り込む仕様ãŒæ˜”ã¯å˜åœ¨ã—ã¾ã›ã‚“ã§ã—ãŸã€‚外部JSファイルをèªã¿è¾¼ã¿ãŸã„時ã«ã¯ã€HTMLファイルã«scriptタグを書ã
Pipeline OperatorãŒstage-1㸠- 技術探ã—
github.com 先月ã®TC39ã®MTGã§stage-1ã«ãªã‚Šã¾ã—ãŸã€‚ F#, OCaml, Elixir, Elm, Julia, Hack, LiveScriptãªã©ã¨ä¼¼ãŸã‚ˆã†ãªæ©Ÿèƒ½ã‚’æä¾›ã—ã¾ã™ã€‚ function doubleSay (str) { return str + ", " + str; } function capitalize (str) { return str[0].toUpperCase() + str.substring(1); } function exclaim (str) { return str + '!'; } let result = exclaim(capitalize(doubleSay("hello"))); // "Hello, hello!" let result = "hello" |> doubleSay // ã“ã“ã®å¼•æ•°ãŒ `he
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