Will duplicate addEventListener calls create duplicate listener entries?

Question

If I have an object that calls

addEventListener(Event.ENTER_FRAME, update);  
addEventListener(Event.ENTER_FRAME, update);

will that add 2 listeners?

Answer 1

Nope, they won't, so update will only be called once when the event triggers.

Answer 2

Depends on what you're attaching the listeners to. If you attach to movieClipX and to movieClipY, you'll have two listeners,so if one of the mcs is removed you'll still have the other listener. If you attach the same listener to the same object twice,it'll behave as a single listener.