A reprieve for ES6 comprehensions
dherman has argued that comprehensions should be removed from the ES6 draft: speakerdeck.com/dherman/a-better-future-for-comprehensions The argument is that the existing comprehension mechanism is incompatible with future extensions, notably parallelism. I am not sure I buy this argument. (Disclaimer: I did the work to adapt SpiderMonkey's comprehensions to ES6 syntax/semantics, and have a colleag
Firfox 30(Nightly)㧠ES6的㪠ArrayComprehension,GeneratorComprehension ãŒå®Ÿè£…ã•ã‚ŒãŸ - hogehoge @teramako
書ãã®ãŒ1週間ã»ã©é…ã‚ŒãŸã€‚ 979865 - Implement ES6 array and generator comprehensions 12.1.4.2 Array Comprehension 12.1.7 Generator Comprehensions var arry = [for (value of iteratableObject) value]; // ArrayComprehension /* == (function() { var list = []; for (let value of iteratableObject) { list.push(value); } return list; }()); */ var gene = (for (value of iteratableObject) value); // GeneratorComprehension
YieldExpression with delegate - 枕を欹ã¦ã¦è´ã
In the latest ECMA262 6th draft (rev15), YieldExpression with delegate detailed algorithm is defined. Reading the spec algortithm, I think this is very useful to put together iterators to make a complex iterator. edit: I've reported issues in the spec about this section. https://bugs.ecmascript.org/show_bug.cgi?id=1486 https://bugs.ecmascript.org/show_bug.cgi?id=1487 For example, function* gen() {
ES.next 追ã£ã‹ã‘ - ECMAScript 勉強会
メーリングリストã®è³¼èª [email protected] ES.next を追ã£ã‹ã‘ã‚‹ãªã‚‰è³¼èªã™ã‚‹ã¹ã— æµé‡å¤šã—。100以上ã®è¿”ä¿¡ãŒä»˜ã事も 僕ã¯èªã‚ã¦ãªã„orz 何ã«å¯¾ã—ã¦è¨€åŠã—ã¦ã„ã‚‹ã‹ä½•ã¨ãªãã¯èªã‚“ã§çµ‚了 Webサイトã¸ã®ãƒªãƒ³ã‚¯ãŒã‚ã‚Œã°ç›®ã‚’通ã—ã¦ã¿ã‚‹ wiki.ecmascript.orgã«æ案を書ã„ã¦ã€ã“ã®MLã§è°è«–を進ã‚ã‚‹å½¢ãŒå¤šã„ 構文抽出 ECMAScript 6th Syntax Grammer ã«ãƒ‰ãƒ©ãƒ•ãƒˆç‰ˆã®æ§‹æ–‡ã‚’ã¾ã¨ã‚ã¦ã¾ã™ ES.next ã§ã¯æ§‹æ–‡ã«å¯¾ã—ã¦å¤šãã®å¤‰æ›´ç‚¹ãŒã‚ã‚‹ ドラフト版ã¯æœ€å¾Œã®æ–¹ã«ã‚ã‚‹Grammer SummaryãŒæ›´æ–°ã•ã‚Œãªã„ 構文をã¾ã¨ã‚ãŸã‚‚ã®ãŒæ¬²ã—ã„ ML ã«ãƒ‰ãƒ©ãƒ•ãƒˆç‰ˆã‚’アップã—ãŸã‚ˆãƒ¼ã‚¢ãƒŠã‚¦ãƒ³ã‚¹ãŒæµã‚Œã‚‹ 変更点ãŒè‰²åˆ†ã‘ã•ã‚ŒãŸPDF版をダウンãƒãƒ¼ãƒ‰ 構文ã®å¤‰æ›´ç‚¹ã«æ³¨ç›®ã—ã¤ã¤HTML㫠利用者ã¯ã€ä¸»ã«Constellationã•ã‚“ã§ã™(onl
ES.next the corner cases
uninitializedãªçŠ¶æ…‹ã‚’æŒãŸãªã„ãŸã‚ BNF見るã ã‘ã§ã¯, initializerãªãã¦ã‚‚è¡Œã‘ãã†ã§ã™ãŒ ES6 draft仕様ã®ç‰¹å¾´ BNFã ã‘ã˜ã‚ƒãªãã¦, semanticsも見ãªã‘ã‚Œã°ã„ã‘ãªã„よã†ã«ãªã£ãŸ section 12.2.1 Static Semantics LexicalBinding : BindingIdentifier It is a Syntax Error if the BindingIdentifier if IsConstantDeclaration of the LexicalDeclaration containing this production is true.
ECMAScript Language Specification ECMA-262 6th Edition - DRAFT
This is not the official ECMAScript Language Specification. The most recent final ECMAScript standard is Edition 5.1, the PDF document located at http://www.ecma-international.org/publications/files/ECMA-ST/ECMA-262.pdf. This is a draft of the next edition of the standard. This page is based on the current working draft published at http://wiki.ecmascript.org/doku.php?id=harmony:specification_draf
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