æœ€é€Ÿã‚¤ãƒ³ã‚¿ãƒ¼ãƒ•ã‚§ãƒ¼ã‚¹ç ”ç©¶ä¼š :: 実践JavaScriptã§é…列をシャッフルã™ã‚‹æ–¹æ³•ãƒªãƒ•ã‚¡ã‚¯ã‚¿ãƒªãƒ³ã‚°JavaScriptã§é…列をシャッフルã™ã‚‹è©±ã‚’見ã¦ã€ãã†ã„ãˆã°Array#shuffleã¯ä»¥å‰æ›¸ã„ãŸè¨˜æ†¶ãŒã‚ã‚‹ãªãƒ¼ã¨æ€ã£ã¦èª¿ã¹ã¦ã¿ãŸã‚‰ã‚³ãƒ”ペã ã£ãŸã€‚ http://www.fumiononaka.com/TechNotes/Flash/FN0212002.html Fisher-Yatesã¨ã„ã†ã‚¢ãƒ«ã‚´ãƒªã‚ºãƒ ã ãã†ã§ã™ã€‚ Array.prototype.shuffle = function() { var i = this.length; while(i){ var j = Math.floor(Math.random()*i); var t = this[--i]; this[i] = this[j]; this[j] = t; } return this; } a = [1,2,3,4,5]; a.shuffle() // 3,1,5,2,4 a // 3,1,5,2,4 ã”ã普通ã«å®Ÿè£…
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