I’ve been working on a Blackjack game and have needed to do a lot of shuffling, cards that is. I’ve seen quite a few shuffling functions over the years. Here is the one I like, partly because I wrote it. Well okay I took what I liked in the others and modified them to come up with these:

public static function randomArray(src:Array):void { var len:uint = src.length; for(var i:int=len-1; i>=0; i--) { var randIndex:uint = randomUint(0, len-1); var temp:* = src[randIndex]; src[randIndex] = src[i]; src[i] = temp; } }

Vector version looks like this:

public static function randomVector(src:*):void { var len:uint = src.length; for(var i:int=len-1; i>=0; i--) { var randIndex:uint = randomUint(0, len-1); var temp:* = src[randIndex]; src[randIndex] = src[i]; src[i] = temp; } }

Here is a sample of how the vector version is used:

Randomize.randomVector(cards as Vector.<Card>);

Here is the randomUint function that it uses:

public static function randomUint(min:uint, max:uint):uint { return Math.random()*((max+1)-min)+min; }

I like to call these functions a random number of times so that the deck of cards is nice and shuffled. Enjoy!