In ActionScript, is there a way to test for existence of variable with datatype "Function"
- by Robusto
So I have a class where I instantiate a variable callback like so:
public var callback:Function;
So far so good. Now, I want to add an event listener to this class and test for existence of the callback. I'm doing like so:
this.addEventListener(MouseEvent.MOUSE_OVER, function(event:MouseEvent) : void {
if (callback) {
// do some things
}
});
This works great, doesn't throw any errors, but everywhere I test for callback I get the following warning:
3553: Function value used where type Boolean was expected.
Possibly the parentheses () are missing after this function reference.
That bugged me, so I tried to get rid of the warning by testing for null and undefined. Those caused errors. I can't instantiate a Function as null, either.
I know, I know, real programmers only care about errors, not warnings. I will survive if this situation is not resolved. But it bothers me! :) Am I just being neurotic, or is there actually some way to test whether a real Function has been created without the IDE bitching about it?
