Introducing SIMD.js – Mozilla Hacks - the Web developer blog
SIMD stands for Single Instruction Multiple Data, and is the name for performing operations on multiple data elements together. For example, a SIMD add instruction can add multiple values, in parallel. SIMD is a very popular technique for accelerating computations in graphics, audio, codecs, physics simulation, cryptography, and many other domains. In addition to delivering performance, SIMD also
JavaScript gains support for SIMD
Update 2017-05-08: a proposal for SIMD.js has been rejected, in favor of providing similar functionality via WebAssembly. Recently, a new JavaScript feature has landed for the next Firefox Nightly: an API for SIMD (Single Instruction, Multiple Data). This blog post explains how the API works and how it fits into the JavaScript landscape. What is SIMD? SIMD is the ability of a CPU to apply an opera
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💡 Personal notes about somthing I'm interested in Date.parse(‘1999-07-07’)を実行すると、値は931305600000とUTCのタイムゾーンで解釈されるのに対して、Date.parse(‘1999/07/07’)を実行すると、値は931273200000とJSTのタイムゾーンで解釈される。あ、ローカルの時間がJSTの場合。現時点（Firefox 24、Chrome 31） Date.parseでは引数に与えられた文字列をパースして、ミリ秒の値を値を返してくれます。タイムゾーンの指定がない場合はローカルのタイムゾーンとして解釈される。ECMA-262では、以下のように説明されています（太字は私がつけた）。 15.9.4.2 Date.parse (string) The parse function applies t
Outlining: a workaround for JITs and big functions
Just In Time (JIT) compilers, like JavaScript engines, receive source code and compile it at runtime. That means that end users can notice how long things take to compile, and avoiding noticeable compilation pauses is important. But JavaScript engines and other modern JITs perform optimizations whose complexity is worse than linear, for example SSA analysis and register allocation. That means that
Callable entities in ECMAScript 6
Update 2013-11-28: There won’t be generator arrow functions in ECMAScript 6 (details). In ECMAScript 5, one creates all callable entities via functions. ECMAScript 6 has more constructs for doing so. This blog post describes them. The status quo: ECMAScript 5 In ECMAScript 5, functions do triple duty: As normal functions: you can directly call functions. As methods: you can assign a function to th
Firefox Nightly (22) に ES6のArrow Function来たる - fragmentary
そもそもES6に入ってるのも知らなかったので、2日前にmozilla-inboundにチェックインされててだいぶ驚いた。 で、Nightlyに入るのを待つこと2日弱、ようやく入ったので試してみた。 おお動く。そしてこのJavaScript書いてない感がすごい。 thisがレキシカルにboundされるようなのでイベントリスナとかで楽そうだー。 追記 (2013-03-21) こんなのよりもっとずっと詳しく丁寧な解説が公開されたのでそちらをどうぞ！ Firefox 22(Nightly) で ArrowFunction が実装されたが、扱いが難しい - hogehoge @teramako
The State of JavaScript
Classes?! No class Maximally Minimal Classes class SkinnedMesh extends THREE.Mesh { constructor(geometry, materials) { super(geometry, materials); this.identityMatrix = new THREE.Matrix4(); this.bones = []; this.boneMatrices = []; ... } update(camera) { ... super.update(); } } Instead of this mess function SkinnedMesh(geometry, materials) { SkinnedMesh.__super__.constructor .call(this, geometry, m
ECMAScript 6 collections, Part 1: Sets - Human Who Codes
Posted at September 25, 2012 by Nicholas C. Zakas Tags: Arrays, ECMAScript 6, JavaScript, Set For most of JavaScript’s history, there has been only one type of collection represented by the Array type. Arrays are used in JavaScript just like arrays and other languages but pull double and triple duty mimicking queues and stacks as well. Since arrays only use numeric indices, developers had to use o
ECMAScript 6: classes
[Update 2015-02-15] Newer version of this blog post: “Classes in ECMAScript 6 (final semantics)” During the July 2012 meeting of TC39 [1], classes have been accepted for ECMAScript 6, the upcoming version of the JavaScript language standard. This blog post explains how those classes work. It is based on Allen Wirfs-Brock’s annotated slides. Overview An ECMAScript 6 class is syntactic sugar for a c
New ES6 spec draft
Allen Wirfs-Brock allen at wirfs-brock.com Sun Jul 8 18:34:58 PDT 2012 Previous message: const and eval in non-strict code Next message: New ES6 spec draft Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] Rev9 (July 8, 2012) of the ES6 Draft Specification is now available at http://wiki.ecmascript.org/doku.php?id=harmony:specification_drafts Changes in this version include: Quasi lit
Esprima
Esprima is a high performance, standard-compliant ECMAScript parser written in ECMAScript (also popularly known as JavaScript). Features Full support for ECMAScript 2019 (ECMA-262 10th Edition) Sensible syntax tree format, with optional node location info Experimental support for JSX, a syntax extension for React Heavily tested (~1600 tests with full code coverage) API Esprima can be used to perfo
iv / js, ES.next test
iv / js : ES.next ES.next lexer and parser (draft based BNF precisely) This is based on ECMA262 6th Edition / Draft February 27, 2012 iv code page
constへの異常な愛情, または私は如何にして心配するのを止めてConstDeclarationを愛するようになったか - 枕を欹てて聴く
JS Advent Calendar, オレ標準コース 1日目, id:Constellation です. あれから1年ですか... 前半で, ES.nextに導入されたDeclarationについてさっと, そして後半でタイトルの説明をします. この文書は, 2011/12/01現在のES5 Engineの実装とES.next draftに基づいています. また, ES.nextの文法がvalidかどうかについては, parserを用意してあるので, 是非ご利用ください. http://constellation.github.com/iv/js/es.next.html Declaration ES.nextでは新たにDeclarationという区切りが入り, LetDeclaration, ConstDeclaration, FunctionDeclarationが導入されました.
ECMAScript 5
Luciano Costa, Agile Software Developer and Consultant at Monttez, 12 minutes ago ECMAScript 5 - Presentation Transcript ECMAScript 5 Damian Wielgosik varjs.comfront-trends.com @varjs Hey, what is that ECMAScript actually? let’s create a simplest object ever var obj = {}; let’s add a property to it var obj = { foo : 1}; let’s read that property var obj = { foo : 1};obj.foo; // 1 - this is how we
Annotated ES5 - 15.11.1 The Error Constructor Called as a Function
This is not the normative ECMAScript Language specification. The normative spec (ECMA 262) is a PDF file maintained by ECMA TC39 and is available from http://www.ecmascript.org/. An auto-generated HTML version is available, too: http://ecma-international.org/ecma-262/5.1/ This is an annotated, hyperlinked, HTML version of Edition 5.1 of the ECMAScript Specification, the source for which is maintai
typeof null === 'object' は ECMAScript 3 の仕様バグ - @think49の日記
ECMAScript 3 の typeof 演算子 typeof演算子は対象の型を返す演算子ですが、null に適用すると "object" が返ってきます。 console.log(typeof null === 'object'); // true では、null は Object 型なのか、というとそうではなくて仕様バグだったりします。 Changed 3 weeks ago by brendan You know, this all came about because of rushing in early May 1995, which led to a leak of type tag representation shared by null and object types. But null means "no object", so it didn't raise h
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