package {

	import flash.display.Sprite;

	public class Main extends Sprite {

		public function Main() {
			init();
		}

		private function init():void {
			trace(getList());
			trace(getList([1, 2]));
		}
		public function getList(list:Array = [0, 0]):Array {
			return list;
		}

	}

}

package {

	import flash.display.Sprite;

	public class Main extends Sprite {
		private var defalut_list:Array = [0, 0];

		public function Main() {
			init();
		}

		private function init():void {
			trace(getList());
			trace(getList([1, 2]));
		}
		public function getList(_list:Array = null):Array {
			var list:Array = _list || defalut_list;
			return list.concat();
		}

	}

}