Question

is it posible to have callable objects on ActionScript? For example:

class Foo extends EventDispatcher
{
  Foo() { super(); }

  call(world:String):String
  {
    return "Hello, " + world;
  }
}

And later…

var foo:Foo = new Foo();
trace( foo("World!") );    // Will NOT work

Answer 1

As others had said, you can’t have callable objects. However, if for some reason you want to have stateful functions, you can achieve it with help of static class variables and package level functions. For example:

// com/example/foo/Helper.as
package com.example.foo {
    public class Helper {
        private static var _instance:Foo;

        public static var data:String;

        public static function get instance():Helper
        {
            if(!_instance) { _instance = new Helper(); }
            return _instance;
        }
    }
}

// com/example/foo/hello.as
package com.example.foo {
    public function hello(world:String):void
    {
        if(Helper.instance.data)
        {
            trace("Bye, " + Helper.instance.data);
        }
        trace("Hello, " + world);
        Helper.instance.data = world;
    }
}

When used, it will print different things.

hello("World!");   // traces "Hello, World!"
hello("People");   // traces "Bye, World!" and "Hello, People"