 
         public function mapEvent(event:String, it:ITransition):void
         {
-            _eventMap[event] ||= [];
+            _eventMap[event] || (_eventMap[event] = []);
             _eventMap[event].push(it);
 
             /* TODO

        public function reset():void
        {
            mapSubmachines(function(value:Object):void {
                if ("reset" in value)
                {
                    value.reset();
                }

            if (!_states) return;
            for each (var state:IState in _states)
            {
                if (!(state && state.subMachines)) continue;
                for each (var submachine:IFsm in state.subMachines)
                {
                    f(submachine);
