Question

I don’t think this is possible, but is there a way to validate the arguments a callback accepts. For example someone passes me callback “mycallback”, I want to assert it accepts an argument String.

public function addHandler(handler : Function) : void{
    //pseudo code 
    Assert.functionAcceptsArguments(handler, String);
 }

Cheers

Answer 1

No you can’t. If you had some object as argument you could use describeType which returns information about methods too. But Function is just a function with no information about arguments.

To be sure that you get right method signature you could pass typed objects not Functions. For example

interface Bla {
  funciton invoke(value:String):void;
}

function addHandler(handler:Bla):void {}