How ECMAScript 5 still does not allow to subclass array — Perfection Kills
Why subclass an array? Naive approach Problems with naive approach Special nature of arrays Function objects and [[Construct]] The importance of array special behavior Existing solutions ECMAScript 5 accessors to the rescue [[Class]] limitations Does [[Class]] matter? Wrappers. Direct property injection. Wrappers. Prototype chain injection. Summary Subclassing an array in Javascript has never been
Dean Edwards: How To Subclass The JavaScript Array Object
It seems easy doesn’t it? Just do this: // create the constructor var Array2 = function() { // initialise the array }; // inherit from Array Array2.prototype = new Array; // add some sugar Array2.prototype.each = function(iterator) { // iterate }; No problemo. Well, there is one problemo. Quite a big problemo in fact. You see, every developer’s favourite browser (Internet Explorer), refuses to mai
Array.isArray - hogehoge @teramako
Firefoxã§ã—ã‹ç¢ºèªã—ã¦ãªã„ã‘ã©ã€Array.isArrayメソッドã®å„ªä½æ€§ã‚’知ã£ãŸã®ã§ãƒ¡ãƒ¢ã€‚ <iframe id="testFrame" src="about:blank"> var iframe = document.getElementById("testFrame"); var doc = iframe.contentDocument; var s = doc.createElement("script"); s.textContent = "var hogehoge = [0,1,2,3,4,5,6]"; doc.body.appendChild(s); var array = iframe.contentWindow.hogehoge; ã¾ã‚ã€é‡è¦ãªã®ã¯åˆ¥ãƒ‰ã‚ュメント内ã§ä½œã‚‰ã‚ŒãŸArrayインスタンスãŒã‚ã‚‹ã“ã¨ã€‚ã“ã“ã§ã¯ã€å¤‰æ•°arrayãŒåˆ¥ãƒ‰ã‚ュメント内ã®Arrayインス
固定長é…列 - 枕を欹ã¦ã¦è´ã
id:uupaa ã•ã‚“ãŒå›ºå®šé•·é…列ãŒã‚ã‚‹ã¨ã„ã„ãªã‚ã¨æ€ã†æ™‚ãŒã‚ã‚‹ã¨ã„ã†è©±ã‚’å—ã‘ã¦. 食ã„ã¤ã„ã¦ã—ã¾ã„ã¾ã—ãŸãƒ¼... 固定長é…列 ECMA262 5.1thã«ãŠã„ã¦ã¯å›ºå®šé•·é…列を利用ã™ã‚‹ã“ã¨ãŒã§ãã¾ã™. Arrayã®lengthã®[[Writable]]ã‚’falseã«ã—ã¦ã—ã¾ãˆã°ã„ã„ã§ã™ãƒ¼! 仕様ã§ã¯ã“ã®æ©Ÿèƒ½ã‚’説明ã™ã‚‹ãŸã‚ã«, Arrayã®[[DefineOwnProperty]]を特殊化ã—ã¦ãŠã‚Š, ã“ã®çµæžœ, 固定長を享å—ã™ã‚‹ã“ã¨ãŒã§ãã¾ã™. Arrayã®[[DefineOwnProperty]]ã®ä¸ã‹ã‚‰, 対象ã®Property Name(P)ãŒArray indexã ã£ãŸæ™‚ã®å‡¦ç†(PãŒuint32_tã§ã‹ã¤UINT32_MAXã§ãªã„)を抜ã出ã—ã¾ã—ãŸ. section 15.4.5.1 より抜粋 4. Else if P is an array index (15.4), then a
ã¯ã¦ãªãƒ–ãƒã‚° | 無料ブãƒã‚°ã‚’作æˆã—よã†
寒波ã«å‚™ãˆã‚ˆï¼2024年冬支度 急ã«å†¬ã«ãªã£ãŸã€‚毎年ã®ã“ã¨ã ã‘ã©æ€¥ã™ãŽã‚‹ã€‚ 令和ã«ãªã£ãŸãらã„ã‹ã‚‰ã€9月以é™å£ç¯€ã®å¤‰ã‚ã‚Šæ–¹ãŒå¤ï¼å¤ï¼å¤ï¼å¤ï¼ã‚ã€ç§‹ï¼Ÿã„ã‚„ã¾ã å¤ï¼å¤ï¼ã¤ã„ã«ç§‹ï¼Ÿç§‹ã‹â€¥ï¼Ÿã„ã‚„ã¾ã å¤ã ï¼ç§‹ï¼ŸãŠã€ã¤ã„ã«ç§‹ã ï¼â€¦ã¯ã„秋終ã‚ã‚Šã¾ã—ãŸå†¬ã§ï½žï½žï½žï½žã™ï¼ã¿ãŸã„ãªã€ãã†ã„ã†æ€¥ã•ãŒã‚る。 秋…
Array.concatã§é…列ã®ã‚¯ãƒãƒ¼ãƒ³(コピー)を作æˆã™ã‚‹ - latest log
JavaScriptã§é…列ã®ã‚¯ãƒãƒ¼ãƒ³ã‚’作æˆã—よã†ã¨ã—ã¦ã€æ‚©ã‚“ã§ã„る方もã„らã£ã—ゃるよã†ã§ã™ãŒã€ 以下ã®ã‚ˆã†ã«ã€for ループやå†å¸°ãªã‚³ãƒ¼ãƒ‰ã‚’手書ãã™ã‚‹å¿…è¦ã¯ãªãã¦ã€Array.concat() ã§é…列ã®ã‚¯ãƒãƒ¼ãƒ³ã¯ä½œæˆã§ãã¾ã™ã€‚ Array.prototype.clone = function(){ return Array.apply(null,this) } Array.prototype.clone = function() { if ( this[0].constructor == Array ) { var ar, n; ar = new Array( this.length ); for ( n = 0; n < ar.length; n++ ) { ar[n] = this[n].clone(); } return ar; } return Array.apply( null,
Implementing Prototype’s Array Methods in jQuery | Learning jQuery
Tips, techniques, and tutorials for the jQuery JavaScript library One of the biggest concerns I've heard mentioned from users of the Prototype library about jQuery is the lack of support for various array methods. The robust features Prototype provides for arrays is of great benefit to developers that do a lot of array manipulation in their JavaScript. However, I find that after moving to jQuery,
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