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ECMAScript 2016+ in Firefox
After the release of ECMAScript 2015, a.k.a. ES6, the ECMAScript Language Specification is evolving rapidly: it’s getting many new features that will help developing web applications, with a new release planned every year. Last week, Firefox Nightly 54 reached 100% on the Kangax ECMAScript 2016+ compatibility table that currently covers ECMAScript 2016 and the ECMAScript 2017 draft. Here are some
High-Speed ES2015
High-Speed ES2015 Benedikt Meurer Google Munich @bmeurer
High-performance ES2015 and beyond · V8
Show navigation Over the last couple of months the V8 team focused on bringing the performance of newly added ES2015 and other even more recent JavaScript features on par with their transpiled ES5 counterparts. Motivation #Before we go into the details of the various improvements, we should first consider why performance of ES2015+ features matter despite the widespread usage of Babel in modern we
ES6 Features
ES6 Features Arrow Functions A short hand notation for function(), but it does not bind this in the same way. no-eval var odds = evens.map(v => v + 1); // no parentes and no brackets var nums = evens.map((v, i) => v + i); var pairs = evens.map(v => ({even: v, odd: v + 1})); // Statement bodies nums.forEach(v => { if (v % 5 === 0) fives.push(v); }); How does this work? var object = { name: "Name",
Native ECMAScript modules: dynamic import()
In the previous article Native ECMAScript modules: the new features and differences from Webpack modules we understood the differences between ES modules and their implementation in bundlers/compilers like Webpack/Babel. So far we found couple gotchas and know how to use the import \ export declarations and which caveats we may have using them in JS. But JavaScript went asynchronous many years ago
Exploring ES2016 and ES2017
Get the book Read online for free. Buy the ebook (DRM-free PDF, EPUB, MOBI) and support my work. About the book “Exploring ES2016 and ES2017”: Covers what’s new in ECMAScript 2016 and ECMAScript 2017. If you want to know more about the rest of JavaScript, consult Axel’s other books. About the author Dr. Axel Rauschmayer specializes in JavaScript and web development. He blogs, writes books and teac
es6-feature-detection.js
es6-feature-detection.js �; ʪ� �H ʪ� var str = 'class ಠ_ಠ extends Array {constructor(j = "a", ...c) {const q = (({u: e}) => {return { [`s${c}`]: Symbol(j) };})({});super(j, q, ...c);}}' + 'new Promise((f) => {const a = function* (){return "\u{20BB7}".match(/./u)[0].length === 2 || true;};for (let vre of a()) {' + 'const [uw, as, he, re] = [new Set(), new WeakSet(), new Map(), new WeakMap()];break;
ES6 arrow functions in depth
One of the prettiest features of ES6, it could easily win a beauty contest, if such a contest would be held. What many people don’t know is that the arrow function is not simply a form of syntactic sugar that we can use instead of the regular callback. As I like to explain it to the people who attend my trainings/workshops, arrow functions are this-less, arguments-less, new.target-less and super-l
Array range в ES2016+
Задача: инициализировать массив и заполнить значениями. Раньше задача решалась строкой: var a = Array.apply(null, {length: 8}).map(Number.call, Number);Но сейчас же уже конец 2016 года (считай что уже 2017). И пишем мы давно не на ES5, а на ES2016+… Array.fillЕсть такой метод: Array.fill — заполняет все элементы массива от начального до конечного индексов одним значением. Но его минус в том, что о
ECMAScriptの情報サイトを始めて1年経った
ECMAScript Daily そういえば、ECMAScript DailyというECMAScriptの情報サイトをやってます。 2015年12月ぐらいに始めたので、1年ぐらい経ってましたがそういえばブログ書いてないことに気づいたので書いています。 基本的にはJSer.infoのECMAScript特化版という位置づけで、基本的な更新スタンスはJSer.infoとは変わらないです。 週一とかではなくて、新しい情報がでたら直接更新のスタイルなので、Realtime JSer.info(JSer.infoのリアルタイム版)の方がより近いです。 記事自体もほぼリンクだけに近いので、Twitter(@EcmascriptDaily)で見たほうが分かりやすいかもしれません。 Follow @EcmascriptDaily 週1でまとめて見たい場合はECMAScript Dailyからメールマガジン
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Why can't we `let s = super`?
Progressive Transpilation at Netflix and the road to running native ES2015 in production
GitHub - mathiasbynens/homebrew-ecmascript: Homebrew formulae for ECMAScript engines
Homebrew formulae for JavaScript engines · Issue #17 · mathiasbynens/todo
https://www.bignerdranch.com/blog/asyncing-feeling-about-javascript-generators/
ES2016 / ES2017の最新動向を追ってみた - Qiita
QuasiLiterals
The Reflect API of ES6
Domain error
