In old AS1 / AS2 you could get away with not passing all the parameters to a function, AS3 on the other hand has none of it.
But what you can do is asssign default values for each parameter so you don’t need to pass a value it.
i.e.
function hideObject(child:DisplayObject,fadeOut:Boolean=false):void
{
if(fadeOut)
{
//fadeout Tweener code
} else {
child.visible = false;
};
}
hideObject(target);//would instantly hide target
hideObject(target , true);//would override default value and so fade