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ECMAScript5ã«é–¢ã™ã‚‹monjudohã®ãƒ–ãƒƒã‚¯ãƒžãƒ¼ã‚¯ (52)

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Object.defineProperty ã§ããªããªã‚‹ã‚±ãƒ¼ã‚¹ - hogehoge @teramako
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()æ™‚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„ãƒ—ãƒãƒ‘ãƒ†ã‚£ å…ˆã«ã€è¨å®šã™ã¹ãã§ãªã„ãƒ—ãƒãƒ‘ãƒ†ã‚£ã‚’ã‚ã’ã¦ãŠã get set va
monjudoh 2013/01/31
JavaScript

ECMAScript5
ãƒªãƒ³ã‚¯
__proto__ãƒ—ãƒãƒ‘ãƒ†ã‚£ã®ä¸æ€è° - hogehoge @teramako
__proto__ãƒ—ãƒãƒ‘ãƒ†ã‚£å‘¨ã‚Šã§JavaScriptå®Ÿè£…ã«ã‚ˆã£ã¦ã„ã‚ã„ã‚æŒ™å‹•ãŒç•°ãªã‚‹ã“ã¨ãŒåˆ†ã‹ã£ãŸã®ã§ãƒ¡ãƒ¢ã€‚ ä»¥ä¸‹ã®ãƒ–ãƒ©ã‚¦ã‚¶(ã‚¨ãƒ³ã‚¸ãƒ³)ã§èª¿ã¹ãŸ Firefox 9.0.1 (Gecko 20111220165912) Google Chrome 17.0.963.12 dev-m (v8 ???) Opera 12.00 alpha (Presto 2.10.238) ã¾ãŸã€Google Chromeã¨Node.jsã§ã®çµæžœã¯åŒã˜ã ã£ãŸã€‚ var bind = Function.prototype.bind, hasOwn = bind.bind(bind.call)(Object.prototype.hasOwnProperty), proto = Object.getPrototypeOf; Object.prototype ã® __proto__ Object.prototype ã®
monjudoh 2013/01/31
JavaScript

ECMAScript5

__proto__
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JSC Array optimization for adding new property - æž•ã‚’æ¬¹ã¦ã¦è´ã
This is a blog post for 12/6 VM advent calendar. See http://qiita.com/advent-calendar/2012/vm for more nice blog posts :) Introduction ECMA262ã«ã¨ã£ã¦Arrayã¯æœ€ã‚‚é‡è¦ãªObjectã®1ã¤ã§ã‚ã‚Š, loopå†…ã§é«˜ã„é »åº¦ã§ã‚¢ã‚¯ã‚»ã‚¹ã•ã‚Œã‚‹æ€§è³ªä¸Š, Arrayã®æœ€é©åŒ–ã¯engineã®å®Ÿè¡Œé€Ÿåº¦ã«å¤šå¤§ãªå½±éŸ¿ã‚’åŠã¼ã—ã¾ã™. ã“ã“ã§ã¯JavaScriptCoreã®è¡Œãªã£ã¦ã„ã‚‹Arrayã«å¯¾ã—ã¦æ–°ã—ã„propertyã‚’è¿½åŠ ã™ã‚‹å‡¦ç†ã®æœ€é©åŒ–ã‚’ç´¹ä»‹ã—ã¾ã™. Background ECMA262ã«ãŠã„ã¦, Arrayã¯literalå½¢å¼ãªã‚‰ã°own propertyã‚’æœ€åˆã‹ã‚‰å®šç¾©ã§ãã¾ã™ãŒ, var array = [0, 1, 2, 3, 4]; console.lo
monjudoh 2013/01/23
ã€Žãã‚Œãã‚Œã‚‚, indexed propertyã«accessorã‚’æŒ‡å®šã—ãªã„ã‚ˆã†ã«ã—ã¾ã—ã‚‡ã†ã€

JavaScript

ECMAScript5

ãƒ‘ãƒ•ã‚©ãƒ¼ãƒžãƒ³ã‚¹
ãƒªãƒ³ã‚¯
ES5, Property Descriptorè§£èª¬ - æž•ã‚’æ¬¹ã¦ã¦è´ã
JavaScript Advent Calendar 2010 6æ—¥ç›®ã®id:Constellationã§ã™. ECMAScript5ã«ãªã£ã¦å¤§ããå¤‰æ›´ã•ã‚ŒãŸã¨ã„ãˆã°, strict mode, early error, Object extras, ãã—ã¦Property Descriptorã®æ¦‚å¿µã§ã™. ã¨ã„ã†ã“ã¨ã§ä»Šå›žã¯ES5 PropertyDescriptorã«ã¤ã„ã¦ã¾ã‚‹ã£ã¨åˆ†ã‹ã£ã¦ã—ã¾ãŠã†ã¨ã„ã†ã“ã¨ã§. Property Descriptorã¨ã¯ JavaScriptã®Objectã¯äº‹å®Ÿä¸ŠHash Tableã§ã™. ã—ã‹ã—, key -> value ã¨ã„ã†å¯¾å¿œã§Hash Tableã«æ ¼ç´ã•ã‚Œã¦ã„ã‚‹ã®ã‹ã¨ã„ãˆã°ãã†ã§ã¯ã‚ã‚Šã¾ã›ã‚“. ãªãœãªã‚‰, EcmaScriptã«ã¯getter / setterã‚„attributeãŒå˜åœ¨ã™ã‚‹ã‹ã‚‰ã§ã™. // getter / setter v
monjudoh 2013/01/23
JavaScript

ECMAScript5
ãƒªãƒ³ã‚¯
Are your mixins ECMAScript 5 compatible? - Human Who Codes
Posted at December 11, 2012 by Nicholas C. Zakas Tags: ECMAScript 5, JavaScript I was working with a client recently on a project that could make full use of ECMAScript 5 when I came across an interesting probl em. The issue stemmed from the use of mixins, a very common pattern in JavaScript where one object is assigned properties (including methods) from another. Most mixin functions look somethin
monjudoh 2013/01/22
ES3ã§ã®mixinã¯åˆ—æŒ™ã•ã‚Œã‚‹keyãã‚Œãžã‚Œã«ã¤ã„ã¦å€¤ã‚’ç§»ã™ã‚‚ã®ã ã£ãŸãŒã€ES5ã§ã®mixinã¯property descriptorã‚’ç§»ã™ã€‚

JavaScript

ECMAScript5

mixin
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Locking the Throne Room - How ES5+ might change views on XSS and Client Side Security
Locking the Throne Room - How ES5+ might change views on XSS and Client Side Security This document discusses using ES5 capabilities to help mitigate cross-site scripting (XSS) vulnerabilities. It summarizes the history of JavaScript and XSS, current approaches to mitigation, and limitations. It then proposes using ES5 features like Object.defineProperty to prohibit unauthorized access to DOM prop
monjudoh 2012/09/13
JavaScript

ECMAScript5

XSS

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BPStudy#60 ECMAScript5æ™‚ä»£ã®JavaScriptãƒ©ã‚¤ãƒ–ãƒ©ãƒª - monjudohâ€™s diary
JavaScript: ä¸–ç•Œã§æœ€ã‚‚èª¤è§£ã•ã‚ŒãŸãƒ—ãƒã‚°ãƒ©ãƒŸãƒ³ã‚°è¨€èªž(2001å¹´) JavaScript: The World's Most Misunderstood Programming Language http://d.hatena.ne.jp/brazil/20050829/1125321936 2012å¹´æœªã èª¤è§£ã•ã‚Œã¦ã„ã‚‹ãƒ—ãƒã‚°ãƒ©ãƒŸãƒ³ã‚°è¨€èªžJavaScript å«Œã‚ã‚Œã¦ã„ã‚‹"JavaScript"ã¨ã¯ä½•ã‹? ECMAScript3 13å¹´å‰ãƒ»å‰ä¸–ç´€(1999å¹´)ã®è¨€èªžä»•æ§˜ IE6 11å¹´å‰(2001å¹´)ã®ãƒ©ãƒ³ã‚¿ã‚¤ãƒ å«Œã‚ã‚Œã¦ã„ã‚‹"JavaScript"ã¨åŒä¸–ä»£ã®å„è¨€èªžã®ãƒãƒ¼ã‚¸ãƒ§ãƒ³ã¯? Python2.1 Ruby1.6 Perl5.6 J2SE1.3 ç¾åœ¨ã®JavaScriptã¯ECMAScript5 ã©ã®ç’°å¢ƒã§ä½¿ãˆã‚‹? http://kangax.github.com/es5-c
monjudoh 2012/08/31
JavaScript

ECMAScript5

BPStudy

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ES5 features on iOS/Android's default browser - æ„›ã¨å‹‡æ°—ã¨ç¼¶ãƒ“ãƒ¼ãƒ«
iOS, Androidã®ã‚ã¼ã—ã„ãƒãƒ¼ã‚¸ãƒ§ãƒ³ã®ãƒ‡ãƒ•ã‚©ãƒ«ãƒˆãƒ–ãƒ©ã‚¦ã‚¶ã«ã¤ã„ã¦ã€ECMAScript 5 compatibility table ã‚’ä½¿ã£ã¦ES5ã®å¯¾å¿œåº¦åˆã„ã‚’èª¿ã¹ã¾ã—ãŸã€‚æ—¢ã«ã‚ã‚Šãã†ã ãªãƒ¼ã¨æ€ã„ã¤ã¤ãƒ‘ãƒƒã¨è¦‹å½“ãŸã‚‰ãªã‹ã£ãŸã®ã§ã€‚ ã©ã‚Œã‚‚ã‚¨ãƒŸãƒ¥ãƒ¬ãƒ¼ã‚¿ã§èª¿ã¹ãŸã‚‚ã®ã§ã™ã—ã€ç‰¹ã«Androidã«ã¤ã„ã¦ã¯ãƒ¡ãƒ¼ã‚«ãƒ¼ãŒæ‰‹ã‚’å…¥ã‚Œã¦ãƒ˜ãƒ³ãƒ†ã‚³ãƒªãƒ³ãªã“ã¨ã«ãªã£ã¦ã„ã‚‹å¯èƒ½æ€§ã‚‚çµæ§‹ã‚ã‚‹ã®ã§ã€ç›®å®‰ç¨‹åº¦ã«ã€‚ å…¨ã¦ã®iOSãƒ‡ãƒã‚¤ã‚¹ãŒ6.0ä»¥ä¸Šã€Androidãƒ‡ãƒã‚¤ã‚¹ãŒ4.1ä»¥ä¸Šã«ãªã‚Œã°strict modeå«ã‚ã¦ã‚„ã‚ŠãŸã„æ”¾é¡Œï¼ˆã‹ã‚‚ï¼Ÿï¼‰ã€ã¨ã„ã†ã“ã¨ãŒåˆ†ã‹ã‚Šã¾ã™ãã€‚ã„ã¤ã«ãªã‚‹ã“ã¨ã‚„ã‚‰ã€‚ feature/os version ios-4.3.2 ios-5.0 ios-5.1 ios-6.0 android-1.6 android-2.1 android-2.3.3 android-3.0 android-4.0.2
monjudoh 2012/08/20
iOS

ECMAScript5

Android

JavaScript
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ã‚¤ãƒ³ã‚¹ã‚¿ãƒ³ã‚¹ã«ä¾å˜ã—ãŸåˆæœŸå€¤ã‚’æŒã¤æ›¸ãæ›ãˆå¯èƒ½propertyã®å®šç¾© - monjudohâ€™s diary
ã‚¤ãƒ³ã‚¹ã‚¿ãƒ³ã‚¹ã«ä¾å˜ã—ã¦ãªã‘ã‚Œã°ã“ã‚Œã§æ¸ˆã‚€ã‹ã‚‰ç°¡å˜ã§ã™ã‚ˆããƒ¼ function A(){} var proto = A.prototype; Object.defineProperty(proto,'key',{ value : 'default', writable : true }); ã‚¤ãƒ³ã‚¹ã‚¿ãƒ³ã‚¹ã«ä¾å˜ã—ã¦ã„ã‚‹å ´åˆã¯prototypeå®šç¾©æ™‚ã«ãã®ã‚¤ãƒ³ã‚¹ã‚¿ãƒ³ã‚¹ãŒå˜åœ¨ã—ãªã„ã®ã§valueã§åˆæœŸå€¤ã‚’å®šç¾©ã§ãã¾ã›ã‚“ã€‚ å˜ç´”ãªã‚³ãƒ¼ãƒ‰ã ã¨ã€å®Ÿéš›ã®å€¤ã‚’ä¿æŒã™ã‚‹åˆ¥propertyã¨get/setã‚’å®šç¾©ã—ã¦ã€ã¾ã ä¿æŒã—ã¦ã„ãªã‹ã£ãŸã‚‰è¨å®šã™ã‚‹ã¨ã‹ãã†ãªã‚‹ã§ã—ã‚‡ã†ã€‚ function foo(val) { // valã®å†…å®¹ã«ã‚ˆã£ã¦æˆ»ã‚Šå€¤ãŒå¤‰ã‚ã‚‹ã¨æ€ã„ããˆ return 'default'; } function A(){} var proto = A.prototype; Object.definePro
monjudoh 2012/07/26
JavaScript

ã‚»ãƒ«ã‚¯ãƒž

ECMAScript5
ãƒªãƒ³ã‚¯
ECMAScript 5th çš„ LazyGetter - hogehoge @teramako
ECMAScript 5th ã‹ã‚‰æ£å¼ã« getter/setter ãŒä½œã‚Œã‚‹ã‚ˆã†ã«ãªã£ãŸã‚ã‘ã ãŒã€ã“ã‚Œã¯Mozilla ã® JavaScript ã§ã‚ã‚‹ SpiderMonkey ã§ã¯å‰ã€…ã‹ã‚‰å®Ÿè£…ã•ã‚Œã¦ã„ãŸã€‚ { get foo() { return ...; } } { set foo(val) { return ...; } } ã«åŠ ãˆã€ Object.prototype.__defineGetter__ Object.prototype.__defineSetter__ ãŒä½¿ãˆãŸã‚ã‘ã ã€‚ ã§ã€ã“ã‚Œã‚’ä½¿ç”¨ã—ãŸãƒãƒƒã‚¯ã¨ã—ã¦ã€ä»¥ä¸‹ã®ã‚ˆã†ãªã‚‚ã®ãŒã‚ã‚‹ã€‚ function Foo () { this.__defineGetter__("bar", function(){ var val = "BAR"; delete this.bar; return this.bar = val; });
monjudoh 2012/04/19
JavaScript

ECMAScript5
ãƒªãƒ³ã‚¯
JavaScript.Next
Developers Summit 2012 ã§ä½¿ç”¨ã—ãŸã‚¹ãƒ©ã‚¤ãƒ‰ å¾ŒåŠã‚’æŠœãå‡ºã—å°‘ã—æ›´æ–°ã—ãŸã‚‚ã®ã¯ã“ã¡ã‚‰: http://www.slideshare.net/dynamis/kanazawajsnextRead less
monjudoh 2012/02/20
JavaScript

æ´å²

ECMAScript6

ECMAScript5
ãƒªãƒ³ã‚¯
uncurryThis é–¢æ•° - hogehoge @teramako
http://wiki.ecmascript.org/doku.php?id=conventions:safe_meta_programming ã«ã¦å¤§å¤‰æœ‰ç”¨ãªæ›¸ãæ–¹ã‚’èº«ã«ç€ã‘ãŸã€‚ Function.prototype.bindã¨Function.prototype.callã®é»’é”è¡“çš„ãªã‚‚ã®ã€‚ obj.hasOwnProperty("prop"); ã¨æ›¸ãã¨ã“ã‚ã‚’callã§æ›¸ãã¨ var func = Object.prototype.hasOwnProperty; func.call(obj, "prop"); ã¨æ›¸ã‘ã‚‹ã€‚ã•ã‚‰ã«callã‚’bindã—ã¦ã¿ã‚‹ã¨ var func2 = func.call.bind(func); func2(obj, "prop"); ã¨ãªã‚‹ã€‚ã•ã‚‰ã«ã€bindã‚’bindã™ã‚‹ã¨ var func3 = func.bind.bind(func.call)(func
monjudoh 2012/01/17
Function.prototype.bind.bind(bind.call)ã§å–å¾—ã—ãŸuncurryThisã«ãƒ¡ã‚½ãƒƒãƒ‰ã‚’æ¸¡ã™ã¨method.callç›¸å½“ã®æ©Ÿèƒ½ã®é–¢æ•°ã‚’è¿”ã™

JavaScript

ECMAScript5

tips
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debugging javascript is a lame title
December 23rd 2011 As it turns out, there are tons of different ways to debug javascript. Considering, I thought it might be useful if I shared all the tools/techniques I regularly use to do just that. If you think of any additional techniques or would like more clarification, please let me know! alerts Every engineer who has written javascript for browsers has probably used an alert to debug. Whe
monjudoh 2012/01/16
Object.definePropertyã§ãƒ—ãƒãƒ‘ãƒ†ã‚£ã‚¢ã‚¯ã‚»ã‚¹ã‚’ãƒ•ãƒƒã‚¯ã—ã¦debugger statementã‚’å…¥ã‚Œã‚‹ã€‚

JavaScript

debug

ECMAScript5
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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? letâ€™s create a simplest object ever var obj = {}; letâ€™s add a property to it var obj = { foo : 1}; letâ€™s read that property var obj = { foo : 1};obj.foo; // 1 - this is how we
monjudoh 2011/12/19
Object.create(null)ã§æœ¬å½“ã«ç©ºã®objectã‚’ä½œã‚‹ã“ã¨ãŒå‡ºæ¥ã‚‹è©±ã€‚

JavaScript

ECMAScript5

ã‚ªãƒ–ã‚¸ã‚§ã‚¯ãƒˆæŒ‡å‘

prototype
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Chai
Chai is a BDD / TDD assertion library for node and the browser that can be delightfully paired with any javascript testing framework.
monjudoh 2011/12/19
definePropertyå¿…é ˆã£ã½ã„

JavaScript

ãƒ†ã‚¹ãƒˆ

ECMAScript5
ãƒªãƒ³ã‚¯
Augment.js - Modern JavaScript
Enables use of modern JavaScript by augmenting built in objects with the latest JavaScript methods. Never overrides any native implementations; it only adds what is missing. Include the augment.js source file before any JavaScript in which you wish to use modern JavaScript methods. Array.prototype.every - Checks whether all elements in the array pass the test implemented by the provided function.
monjudoh 2011/05/30
es5-shimã¨ã»ã¼åŒã˜ã£ã½ã„https://github.com/kriskowal/es5-shim

JavaScript

ECMAScript5

library
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monjudoh 2011/04/06
Strict mode

JavaScript

ECMAScript5
ãƒªãƒ³ã‚¯
strict mode - motivation and semantics - Constellation Scorpius
çµŒéŽå ±å‘Š 1 iv / lv5ãŒES5 Conformance Suiteã§passã™ã¹ãtestã‚’å…¨ã¦passã—ã¾ã—ãŸFAILã—ã¦ã‚‹ã‚‚ã®ã¯testãŒé–“é•ã£ã¦ãŸã‚Š, RegExp.prototype.compileã®ã‚ˆã†ã«ES5ã«ã¯ã„ã‚‰ãªã‹ã£ãŸã‚Š
monjudoh 2011/04/06
JavaScript

ECMAScript5

Strict mode
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hachy.netÂ -Â ã“ã®ã‚¦ã‚§ãƒ–ã‚µã‚¤ãƒˆã¯è²©å£²ç”¨ã§ã™ï¼Â -Â hachy ãƒªã‚½ãƒ¼ã‚¹ãŠã‚ˆã³æƒ…å ±
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monjudoh 2011/01/27
ä¸€ç•ªä¸‹ã«ã€Žgetterã¨ã‹setterã¨ã‹ã‚‚å«ã‚ã¦å†å®šç¾©ã€ã™ã‚‹objectã®cloneé–¢æ•°ã®å®Ÿè£…ã®ä»•æ–¹ãŒæ›¸ã‹ã‚Œã¦ã‚‹ã€‚

JavaScript

ECMAScript5
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Function.prototype.bindã¯ä½•ãŒã„ã„ã®ã‹ - æž•ã‚’æ¬¹ã¦ã¦è´ã
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