One of the things I often wonder about actionscript 3 is the best way to pass arguments to a function through an event listener. Typically when you add an event listener, you simply specify a type of event, and the name of the function to call when the event is dispatched. (You may also specify the optional parameters useCapture, priority, and useWeakReference, but seeing as how that’s not relevant to the subject at hand, we’ll be focusing on just the first two):

myButton.addEventListener(MouseEvent.CLICK, outputText);

When ‘myButton’ was clicked, this would then call the function ‘outputText’, which would take just one parameter – the event that triggered it:

function outputText(evt:MouseEvent):void {
trace("Hello World!");
}