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Asynchronous code gets easier with ES2016 Async Function support in Chakra and Microsoft Edge
While we work on rounding out our ES6/ES2015 support, the Chakra team is already looking ahead to ES2016 and, especially, to Async Functions. Today, we’re excited to announce the availability of Async Functions in Microsoft Edge as an experimental feature, available to preview starting in Microsoft Edge (EdgeHTML 13.10547). http://channel9.msdn.com/Blogs/Seth-Juarez/Async-Functions-in-JavaScript-w
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JavaScriptã¯å€¤æ¸¡ã—ãªã®ã§ã—ょã†ã‹ï¼Ÿå…±æœ‰æ¸¡ã—(å‚ç…§ã®å€¤æ¸¡ã—)ãªã®ã§ã—ょã†ã‹ï¼Ÿæ™®é€šã®Objectã¯ã™ã¹ã¦å…±æœ‰æ¸¡ã—ã ã¨æ€ã†ã®ã§ã™ãŒã€ãƒ—リミティブ型(？)ã«ã¤ã„ã¦ã¯é•ã†ã‚ˆã†ãªã®ã§ã™ã€‚ã—ã‹ã—ã€StackOverflow(※)ã§ã‚‚ã¾ã¨ã¾ã£ã¦ã„ãªã„よã†ã§ã€ã‚ˆãã‚ã‹ã‚Šã¾ã›ã‚“ã§ã—ãŸã€‚詳細を分ã‹ã‚‹æ–¹ãŒã„ã‚Œã°ã€ä¸‹è¨˜ã«ã¤ã„ã¦æ•™ãˆã¦ä¸‹ã•ã„。 ※å‚考: StackOverflow: Is JavaScript a pass-by-reference or pass-by-value language? 値渡ã—ã«ãªã‚‹åž‹ã¯ã‚ã‚‹ã®ã§ã—ょã†ã‹ï¼Ÿã‚ã‚‹å ´åˆã¯ã€ã©ã®åž‹ãŒãªã‚‹ã®ã§ã—ょã†ã‹ï¼Ÿ 1.ã®åž‹ã®ã†ã¡mutableãªåž‹ã¯ã‚ã‚‹ã®ã§ã—ょã†ã‹ï¼Ÿã‚ã‚‹å ´åˆã¯ã€mutableãªåž‹ã®ç ´å£Šçš„メソッドã¯ã©ã®ã‚ˆã†ãªã‚‚ã®ãŒã‚ã‚‹ã®ã§ã—ょã†ã‹ï¼Ÿ 値渡ã—ã§ã‚ã‚‹ã“ã¨ãŒåˆ†ã‹ã‚‹(共有渡ã—ã§ã¯èª¬æ˜Žã§ããªã„)コードã¯ã‚ã‚Šã¾ã™ã§ã—ょã†ã‹ï¼Ÿ C++ã‚„C#ã§è¨€ã†
SIMDåž‹ã«ã¤ã„㦠- JS.next
æ¦‚è¦ æ–°ã—ã„プリミティブ型ã§ã‚ã‚‹SIMDåž‹åŠã³APIãŒV8ã§å®Ÿè£…ã•ã‚Œã¦ãã¦ã„る。 SIMDã¨ã¯ã€è¤‡æ•°ã®æ•°å€¤ã‚’並ã¹ã¦ï¼‘ã¤ã®å€¤ã¨ã—ãŸã‚ˆã†ãªãƒ‡ãƒ¼ã‚¿åž‹ã§ã‚る。 ã“ã‚Œã¯CPUã«ã‚ˆã£ã¦åŠ¹çŽ‡è‰¯ãサãƒãƒ¼ãƒˆã•ã‚Œã¦ã„るデータ型ã§ã‚り〠1 + 2 -> 3 ã‚’ã™ã‚‹ã‚ˆã†ã« [ 1, 2, 3, 4 ] + [ 2, 3, 4, 5 ] -> [ 3, 5, 7, 9 ] ã‚’1回ã®æ¼”ç®—ã§ã™ã‚‹ã“ã¨ãŒã§ãる。 ã¤ã¾ã‚Šã€æ²¢å±±ã®æ•°å€¤ã‚’扱ã†å ´é¢ã§SIMD型を利用ã™ã‚‹ã“ã¨ã§ã€ä½•å€ã‚‚ã®ãƒ‘フォーマンスå‘上ãŒæœŸå¾…ã§ãる。 （※WASMã«å…¥ã‚‹ã“ã¨ã¨ãªã‚Šã€ESã‹ã‚‰ã¯ä¸€æ—¦å–り除ã‹ã‚Œã¾ã—ãŸã€‚） 実装ã•ã‚Œã‚‹åž‹ float32x4 32bit浮動å°æ•°ç‚¹åž‹ã‚’4ã¤ä¸¦ã¹ãŸ128bitã®ãƒ‡ãƒ¼ã‚¿åž‹ float32ã¯JSã®é€šå¸¸ã®numberã§ã‚ã‚‹ã¨ã“ã‚ã®float64より精度ãŒä½Žã„ int32x4 32bit符å·ä»˜ãæ•´æ•°åž‹ã‚’4ã¤ä¸¦ã¹ãŸ128bitã®ãƒ‡ãƒ¼ã‚¿
Understanding ECMAScript 6: Class and Inheritance — SitePoint
Stay Relevant and Grow Your Career in TechPremium ResultsPublish articles on SitePointDaily curated jobsLearning PathsDiscounts to dev toolsStart Free Trial7 Day Free Trial. Cancel Anytime. Key Takeaways ES6 allows developers to simulate classes and inheritance with JavaScript, a prototype-oriented language, facilitating the creation of large applications for the web. ES6 introduces new semantics
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æ¦‚è¦ ã‚ªãƒ–ã‚¸ã‚§ã‚¯ãƒˆãƒªãƒ†ãƒ©ãƒ«ãŒæ‹¡å¼µã•ã‚Œã¦ãƒ—ãƒãƒ‘ティをçŸã定義ã§ãるよã†ã«ãªã£ãŸã€‚ 例 ã“ã‚ŒãŒã€ var x = 1, y = 2, z = 3 var obj = { x: x, y: y, z: z } ã“ã†æ›¸ã‘る。 var x = 1, y = 2, z = 3 var obj = { x, y, z } 実装ã•ã‚Œã‚‹ãƒãƒ¼ã‚¸ãƒ§ãƒ³ V8　3.30.1
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This document discusses the history and evolution of JavaScript and ECMAScript. It begins with the origins of JavaScript in the mid-1990s as LiveScript and Mocha, developed by Netscape. JavaScript was standardized by Ecma International as ECMAScript, with various versions released over time adding new features. The presentation focuses on the latest ECMAScript 6 specification, covering new feature
Firefox 24(Nightly) 㧠{Array,Map,Set}.prototype.{keys,values,entries} メソッドç‰ãŒå®Ÿè£…ã•ã‚ŒãŸ - hogehoge @teramako
869996 – Set.prototype.{keys, values, entries} 875433 – iterator methods of [Array, Map, Set].prototype should be same function object as entries/values Array.prototype values() Map.prototype keys() values() entries() Set.prototype keys() values() entries() 辺りãŒå®Ÿè£…ã•ã‚ŒãŸã€‚ ã©ã®ãƒ¡ã‚½ãƒƒãƒ‰ã‚‚イテレータを返ã™ã€‚ Array var arr = ["a", "b", "c"]; var iter = arr.values(); // [object Array Iterator] arr.push("d"); var v; for (let
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What is test262? test262 is a test suite that may be used to check how closely a JavaScript implementation follows the ECMAScript 5th Edition Specification. The test suite contains thousands of individual tests, each of which tests some specific requirements of the ECMAScript specification. What is ECMAScript? "ECMAScript" is the name under which the language more commonly known as "JavaScript" is
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The document discusses a self-hosted scheme written in JavaScript. JavaScript is used to implement a minimal Scheme interpreter and runtime. The goal is to have a fully self-hosted Scheme system written entirely in JavaScript that can run in any modern web browser without any other dependencies.Read less
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ES-Discuss ã®ãƒ¡ãƒ¼ãƒªãƒ³ã‚°ãƒªã‚¹ãƒˆã§çŸ¥ã£ãŸã€‚ Object.prototype.get = function(){}; var o = {}; Object.defineProperty(o, "hoge", { value: "OK" }); // TypeError: property descriptors must not specify a value or be writable when a getter or setter has been specified Object.prototypeã« get, set ã‚ãŸã‚Šã®ãƒ—ãƒãƒ‘ãƒ†ã‚£ã‚’è¿½åŠ ã—ã¦ã—ã¾ã†ã¨ã€Object.defineProperty()時ã«ä¾‹å¤–ãŒç™ºç”Ÿã—ã¦ã„ã—ã¾ã†ä»¶ã€ã¨ã„ã†ã‚„ã¤ã€‚ Object.prototype ã«è¨å®šã™ã¹ãã§ãªã„プãƒãƒ‘ティ å…ˆã«ã€è¨å®šã™ã¹ãã§ãªã„プãƒãƒ‘ティをã‚ã’ã¦ãŠã get set va
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Similar in style to weak maps but without the funny garbage collection semantics or non-enumerability. Depends on the iterators and egal proposals. Depends on classes only for expository purposes. Given /** A non-stupid alternative to Array.prototype.indexOf */ function indexOfIdentical(keys, key) { for (var i = 0; i < keys.length; i++) { if (keys[i] is key) { return i; } } return -1; } Executable
ECMAScript Language Specification - ECMA-262 Edition 5.1
Standard ECMA-262 5.1 Edition / June 2011 ECMAScript® Language Specification This is the HTML rendering of Ecma-262 Edition 5.1, The ECMAScript Language Specification. The PDF rendering of this document is located at https://ecma-international.org/wp-content/uploads/ECMA-262_5.1_edition_june_2011.pdf. The PDF version is the definitive specification. Any discrepancies between this HTML version and
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