how to use the Function type in AS3 (var f:Function) for a method f(s:String)

Question

i have a class that has something like this

public class Foo {
public var f:Function;
public void method(s:String)
{
  f.invoke(s);
}

}

so i need to assign to the f a function that takes an argument f(s), something like

myFoo.f = thefunction
function(s:String)

how to do all this, so it will work correctly ?

Answer 1

if you are meaning, how to do anonymous functions...

myFoo.f = function( s : String ) {
    //do Stuff to string
}

Then you can use the code you have above.

Answer 2

You should not point anywhere, that your function takes one String argument. If it takes int, or takes 2 arguments, - it would be a runtime error.

myFoo.f = myFunction;

public void function myFunction(s: String): void
{
}

public class Foo {
    public var f:Function;
    public void method(s:String)
    {
        f(s);
    }
}

Answer 3

Just to add a nice example:

     import mx.events.FlexEvent;
  public var f:Function;

  protected function application1_creationCompleteHandler(event:FlexEvent):void
  {
   f = addSmile;
   method(' my string');
   f = addFrown;
   method(' my string');

   // Or you can do it straight like this:
   f(' my string');


   // Or alternatively write a function for replacing f
   makeF(addSmile);
   f(' my string');
  }

  public function method(s:String):void
  {
   f(s);
  }

  private function addSmile(s:String):void
  {
   trace (s+' :)'); 
  }
  private function addFrown(s:String):void
  {
   trace (s+' :('); 
  }      

  protected function makeF(newF:Function):void
  {
   f= newF;
  }

will output

 my string :)
 my string :(
 my string :(
 my string :)