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devnull69 on 02/20/12

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array

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Last Edited at 02/20/12 07:54pm

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Array shuffle without bias

/ Published in: JavaScript

The usual way to shuffle an array uses the .sort() method with Math.round(Math.random())-0.5
This solution is highly biased based on the sort algorithm used by the browsers. A sort comparison operation has to fulfill the condition "if a>b then b

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// (C) Stephen "felgall" http://www.codingforums.com/showthread.php?t=252059
 
Array.prototype.shuffle = function() {
   var s = [];
   while (this.length) s.push(this.splice(Math.random() * this.length, 1));
   while (s.length) this.push(s.pop());
   return this;
}