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author: black [+], Submitted: 05.20.03 8p • Last Edit: 06.07.03 1a

/************** Array.prototype.random *****************

		Flashed by black

Description:	By invoking this method you will get 
                  random elements of the caller array~

********************************************************/
Array.prototype.random = function()
{
	var len = this.length;
	var temp = new Array();
    	for (var i=0; i<len; i++)
	{
		var ran = Math.round(Math.random() * (this.length - 1));	// this.length is required because we need a dynamic digit here~
		temp[i] = this[ran];
		this.splice(ran, 1);
	}
	// Reassign values to original array~
	for (var j=0; j<len; j++)
	{
		this[j] = temp[j];
	}
}

usage

[b]No parameters needed, this method will work the caller array~[/b]

Example:
[code]
arr = [ 1, 2, 3, 4, 5 ];
arr.random();
trace(arr);    // Check the result~
[/code]

msg1 { zipnedles [+], posted: 05.23.03 6p•-, top [^] }

another solution:

Array.prototype.random = function() {
	var r = [];
	var t = this.length;
	for(var i = 0; i < t;
		r[i++] = this.splice(Math.floor(Math.random()*this.length),1)
	);
	for(var j=0;j<t;j++) this[j] = r[j];
	return this;
}

//
var a = [0,1,2,3,4,5];
a.random();
trace(a);

msg2 { tumetom [+], posted: 05.26.03 1p•-, top [^] }

and another:

Array.prototype.random=function(){
	this.sort(function(){return Boolean(random(2))});
return true
}

msg3 { iv [+], posted: 10.12.05 7a•-, top [^] }

this method faster more than 100 times than method in previous post:

Array.prototype.shuffle = function() {
var len = this.length;
var i = len
while (i--) {
var j = random(len);
var n = this[j];
this[j] = this[i];
this[i] = n;
}
};
// TEST
arr = [];
i = 10000;
while (i--) {
	arr[i] = i
}
t = getTimer();
arr.shuffle();
trace((getTimer()-t));