This code show how to use map with Array.

var originalArray:Array = new Array(1,2,3,4,5);

function getDouble(elem:*, i:int, a:Array):Number {
	return elem * 2;
}

var multipliedArray:Array = originalArray.map(getDouble);
trace('output: ', originalArray);
// output: 1,2,3,4,5
trace('output: ', multipliedArray);
// output: 1,4,6,8,10