Question

There is a Point (flash.geom.Point) class in as3
I want to add method to class Point (e.g. convertToStagePointMyMethod()) and I’d like to call this method by using

var a:Point=new Point();
a.convertToStagePointMyMethod()

What should I do in order to add this method to class Point? Is it possible without inheritance. I’d like to use it like “partial” classes in .NET

Answer 1

Here is a quick example using prototype :

Point.prototype.foo = function (arg:String):void{
    trace("foo called");//foo called
    trace("arg",arg);//this is a test
    trace("x",this.x);//7
    trace("y",this.y);//54
};

var p:Point = new Point(7,54);
p["foo"]("this is a test");

This is the only way to do this without extending a class.
Also note that the compiler will not compile in strict mode if you try to use p.foo("test"), that’s why i wrote p["foo"]("test") in my example.