Comments on: AS3 Array Shuffle

By: Thales

Thales — Mon, 27 Feb 2012 15:25:13 +0000

Trying an Array: a[1,2,3,4,5,6,7,8,9,10],
This function give us 5% chance of the first position stay with 1 and 20% of the last stay with 10.

function shuffle3(array_arr:Array):Array{
for(var i:Number = 0; i < array_arr.length; i++){
var randomNum_num = Math.floor(Math.random() * array_arr.length);
var arrayIndex = array_arr[i];
array_arr[i] = array_arr[randomNum_num];
array_arr[randomNum_num] = arrayIndex;
}
return array_arr;
}

this one have 10% for each position of that array.

By: aiux

aiux — Mon, 17 Oct 2011 10:55:27 +0000

actually nothing is truly random in desktop computing :)

By: andy

andy — Wed, 05 Oct 2011 17:06:43 +0000

splicing is slow, but it also provides a truly random array… the quickest published way is biased toward keeping keeping earlier elements in the initial array earlier in the mixed array, here are my two utility randomizing methods:

public static function randomizeArray(array:Array):Array
{
//l=length arr=temp parameter array mixed=randomized array i=index
var l:int = array.length,arr = array.slice(),mixed:Array = new Array(l),i:int;
for (i = 0; i {
mixed[i] = arr.splice(int(Math.random() * (l - i)), 1)[0];
}
return mixed;
}

public static function randomizeArrayQuick(array:Array):Array
{
//This method is significantly faster, but not truly random
//l=length mixed=randomized array r=random number i=index e=array element
var l:Number = array.length,mixed:Array = array.slice(),r:Number,i:Number,e:Object;
for (i = 0; i {
e = mixed[i];
r = Math.floor(Math.random() * l);
mixed[i] = mixed[r];
mixed[r] = e;
}
return mixed;
}

By: sid

sid — Mon, 29 Aug 2011 05:33:10 +0000

perfect suffling

By: andreas

andreas — Thu, 10 Feb 2011 14:00:13 +0000

thanks, comes in handy … who cares fo 2 milliseconds ;)

By: Flassari

Flassari — Fri, 14 May 2010 14:53:12 +0000

Thanks for that info MrSteel, good to have that reference here

By: MrSteel

MrSteel — Fri, 14 May 2010 14:37:28 +0000

nice way but it’s not the fastest
take a look http://mrsteel.wordpress.com/2007/06/15/randomize-array-shuffle-an-array-in-flash/

shuffle by slice is one of slowest methods actually

By: chichilatte

chichilatte — Mon, 29 Mar 2010 21:28:39 +0000

Ta buddee :)

By: philtre

philtre — Tue, 23 Mar 2010 14:29:07 +0000

It would probably be a tad faster like this:

var len:int = arr.length;
var arr2:Array = new Array(len);
for(var i:int = 0; i {
arr2[i] = arr.splice(int(Math.random() * (len - i)), 1)[0];
}

By: xxxxGame

xxxxGame — Mon, 22 Mar 2010 02:00:14 +0000

nice thank u!