private var _hash:Object = {};
private function onKeyReleased(event:KeyboardEvent):void {
delete _hash[event.keyCode];
}
private function onKeyPressed(event:KeyboardEvent):void {
_hash[event.keyCode] = 1;
}
private function isKeyDown(code:int):Boolean {
return _hash[code] !== undefined;
}
stage.addEventListener(KeyboardEvent.KEY_UP, onKeyReleased);
stage.addEventListener(KeyboardEvent.KEY_DOWN, onKeyPressed);
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