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spideron/String.prototype.shuffle

Last active December 12, 2015 06:59
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shuffle string
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String.prototype.shuffle
String.prototype.shuffle = function(size){
var arr = this.split('');
for(var j, x, i = arr.length; i; j = parseInt(Math.random() * i), x = arr[--i], arr[i] = arr[j], arr[j] = x){};
arr = arr.join('');
return size ? arr.substr(0, Math.min(size, arr.length-1)) : arr;
};
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