How to call a setter method with arguments dynamically in flash AS3 - actionscript-3

Question

This AS3 function works for normal methods and getter methods:
public function MyClassTestAPI(functionName:String, ...rest):* {
var value:*;
try {
switch(rest.length) {
case 0:
value = myObj[functionName];
break;
case 1:
value = myObj[functionName].call(functionName, rest[0]);
break;
case 2:
value = myObj[functionName].call(functionName, rest[0],rest[1]);
break;
default:
throw("Cannot pass more than 2 parameters (passed " + rest.length + ")");
}
}
return value;
}
Sample usage:
this.MyClassTestAPI("Foo", "arg1"); // tests function Foo(arg1:String):String
this.MyClassTestAPI("MyProperty"); // tests function get MyProperty():String
this.MyClassTestAPI("MyProperty", "new value");// tests function set MyProperty(val:String):void
The third call does not work (throws exception).
How can I make it work for setter methods as well?
Thanks!
edit:
This is a version that works, except with getter and setter that have additional parameters.
It is ok for my needs:
public function MyClassTestAPI(functionName:String, ...rest):* {
var value:*;
try {
if (typeof(this.mediaPlayer[functionName]) == 'function') {
switch(rest.length) {
case 0:
value = myObj[functionName].call(functionName);
break;
case 1:
value = myObj[functionName].call(functionName, rest[0]);
break;
case 2:
value = myObj[functionName].call(functionName, rest[0],rest[1]);
break;
default:
throw("Cannot pass more than 2 parameters (passed " + rest.length + ")");
}
} else {
switch(rest.length) {
case 0:
value = myObj[functionName];
break;
case 1:
myObj[functionName] = rest[0];
break;
default:
throw("Cannot pass parameter to getter or more than one parameter to setter (passed " + rest.length + ")");
}
}
}
return value;
}

Answer 1

Setter functions works as variables, so you can't use it in this way:
myProperty.call( "new value" );
Your function for variables is pointless, because you just have to do a value assignment:
myProperty = "new value";
By the way you can include it in your function in two ways:
create a third parameter what tells your function it is a function or variable
create the value assignment in the catch section

Answer 2

You are currently passing only one string with value "new value"
This should do the trick:
this.MyClassTestAPI("MyProperty", "new","value");
For more information on this matter check the Adobe LiveDocs at:
http://livedocs.adobe.com/flex/3/html/help.html?content=03_Language_and_Syntax_19.html
Cheers