package 
{
    import flash.display.Sprite;
 
    public class Main extends Sprite
    {
        public function Main()
        {
            var vec01:Vector.<int> = Vector.<int>([1, 2, 3, 4, 5, 6, 7, 8, 9]);
            var vec02:Vector.<int> = vec01.map(mapFunc);
            trace( vec02 ); // --- null
        }
        private function mapFunc(item:int, index:int, vector:Vector.<int>):uint
        {
            var vol:int = item * 100;
            return vol;
        }
    }
}