Question

Afraid that I may be over-thinking this and also do not know which keywords I should be using to find more information. Needless to say my searches are proving futile. I would like to know if there is a reason that, within an AS3 class, I would want to do something like this:

var myStageInstance:Stage;

//within an arbitrary class
var myStageInstance:Stage = stage;
myStageInstance.addEventListener(MouseEvent, someFunction);

as opposed to something that I would normally do:

//within an arbitrary class
stage.addEventListener(MouseEvent, someFunction);

There is no particular problem that I am looking to solve right now. I would just like to know if there is a reason to use one method over the other.

Answer 1

the follow code will not work it is broken as myStageInstance is null until you assign it something.

var myStageInstance:Stage;
//within an arbitrary class
myStageInstance.addEventListener(MouseEvent, someFunction);

//You need to do 
var myStageInstance:Stage = stage;
myStageInstance.addEventListener(MouseEvent, someFunction);

//this is more preferred as it is a lot less code. 
stage.addEventListener(MouseEvent, someFunction);