Dates and Times in JavaScript
tl;dr: We are looking for feedback on the Temporal proposal. Try out the polyfill, and complete the survey; but don't use it in production yet! JavaScript Date is broken in ways that cannot be fixed without breaking the web. As the story goes, it was included in the original 10-day JavaScript engine hack and based on java.util.Date, which itself was deprecated in 1997 due to being a terrible API a
GitHub - engine262/engine262: An implementation of ECMA-262 in JavaScript
An implementation of ECMA-262 in JavaScript Goals 100% Spec Compliance Introspection Ease of modification Non-Goals Speed at the expense of any of the goals This project is bound by a Code of Conduct. Join us in #engine262:matrix.org. While helping develop new features for JavaScript, I've found that one of the most useful methods of finding what works and what doesn't is being able to actually ru
JavaScript loose comparison (==) step by step
JavaScript "loose" comparison step by step When you start learning JavaScript, you will likely read about preferring to use === over == to compare values. But why? == performs type conversion: If the two values are not of the same data type, they are converted to the same type first. While this seems, and can be, convenient, this process is not necessarily intuitive. Below you can provide two valu
ES6 Modules のエラー処理を決定的(deterministic)にした話
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ECMAScript® 2016 Language Specification
Toggle shortcuts help? Toggle "can call user code" annotationsu Toggle early exit annotationse Navigate to/from multipagem Jump to search box/ Toggle pinning of the current clausep Jump to the nth pin1-9 Jump to the 10th pin0 Jump to the most recent link target` Multipage preference No preference Always single-page Always multi-page Introduction1 Scope+2 Conformance2.1 Example Normative Optional C
window.event の標準化及び使用の是非について | teratail
Q1.について 標準化されていないと思います。 私も、7.2 The Window object - HTML Standardを見ましたが、 該当するような箇所は見つかりませんでした。 w3cの仕様でもそうですね。 Q2.について 他のイベントが発火したら書き換えられる不安定なもの、という意味では、 イベントハンドラで処理している間に他のスレッドから書き換えられる事は、 仕様上は無いので、問題なさそうです。 ブラウザにバグがあって仕様を満たしていない場合は、 どうしようもありませんが。 Javascriptでのスレッドは、メインのスレッド1つと、Web Workerのスレッドしかなく、 Web Workerからはwindowオブジェクトを参照、操作できないためです。 Javascriptがシングルスレッドという事について 仕様のどの部分によるものか、私も気になっていましたので、 この機会
GitHub - ljharb/String.prototype.matchAll: Spec-compliant polyfill for String.prototype.matchAll ESnext proposal.
const assert = require('assert'); const matchAll = require('string.prototype.matchall'); const str = 'aabc'; const nonRegexStr = 'ab'; const globalRegex = /[ac]/g; const nonGlobalRegex = /[bc]/i; // non-regex arguments are coerced into a global regex assert.deepEqual( [...matchAll(str, nonRegexStr)], [...matchAll(str, new RegExp(nonRegexStr, 'g'))] ); assert.deepEqual([...matchAll(str, globalRegex
Not forcing super in derived class's constructor?
TLDR: If this is used without super (which should be statically analyzable), let it refer to Object.create(new.target.prototype). Otherwise, let super creates what it refers to. I know the reason to force super in derived class's constructor is to make sure this refers to the exotic object the base class might allocate. But I bet in real world, extending base classes who only create ordinary objec
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Normative: Add `using` and `await using` Declarations, SuppressedError, DisposableStack, and AsyncDisposableStack by rbuckton · Pull Request #3000 · tc39/ecma262
I-D/javascript-mjs/draft.md at master · bmeck/I-D
import.meta should be allowed in direct eval · Issue #7 · tc39/proposal-import-meta
GitHub - hzoo/role-of-babel-in-js: Role of Babel in JS (TC39 May 2017)
GitHub - kitcambridge/js-history: A repository of historical JavaScript language references.
GitHub - leurfete/proposal-date-time-string-format: An amended Date Time String Format with more explicit syntax.
Navigating the ECMAScript® 2015 Language Specification | victor felder
GitHub - tc39/proposal-string-left-right-trim: A proposal to the ECMAScript standard for including left and right trim of whitespace to strings
GitHub - tc39/ecma402: Status, process, and documents for ECMA 402
GitHub - tc39/proposal-observable: Observables for ECMAScript
Spec: JavaScript Shared Memory, Atomics, and Locks
GitHub - leebyron/ecmascript-more-export-from: Proposal: add more export-from statements in ES7
