Dictionary good practice

programming flash
1

Hi! A few questions about dictionary:

  1. Is anything wrong in doing something like this:

var mc = new MovieClip();
dictionary[mc] = mc; //in other words, the same mc as key AND value

I mean, any particular implication on performance? is it a bad practice?

  1. Does it cause performance or memory problems to use moviclips as keys instead of primitive values?

  2. Is is a good practice doing something like this:

private function prepare(){
   fxArray = new Array();
   fxDictionary = new Dictionary();
}

public function addFxListener(fx){
   fxArray.push(fx);
   fxDictionary[fx] = fxArray.length-1;
fxArray[fxDictionary[fx]].addEventListener(PageEvent.TRANS_IN_FINISHED,notifyPageEvent);
fxArray[fxDictionary[fx]].addEventListener(PageEvent.TRANS_OUT_FINISHED,notifyPageEvent);
}

Where fx are classes extending Movieclip, fxArray is an array where I store fx referencies and fxDictionary is a dictionary where I store indexes of the fxArray, using the relative fx as key. What do you think about this kind of usage?

also another question:

  1. Does a code like this create a reference to mc (along with events and so on?):
dictionary[mc] = 7 //(the value is a primitive)

I mean, if I then destroy mc, the line above will still keep it somehow alive?

Ooops… Maybe I should move this thread to the AS3 forum??? Could the administrator do it maybe? Sorry…