Lexically Binding a Function

[WhiteDragon]

I was playing with function closures in GS2, trying to make them do something useful, and after hacking away at the callstack for awhile, I finally managed to do this.

PHP Code:

join("utility_bind");
//#CLIENTSIDE
function foobar(temp.a, temp.b) {
  temp.c = 5;
  temp.baz = function (temp.x) {
    temp.scope = this.getScope();
    return temp.scope.a + temp.scope.b + temp.scope.c + temp.x;
  };
  this.bind(temp.baz);
  return temp.baz;
}
function onCreated() {
  temp.f = this.foobar(5, 10);
  echo(temp.f(5)); // echos 25
} 


(Beware that copying this directly will add a space after every line, screwing up //#CLIENTSIDE)

Basically, you can bind the current state of the outer function (foobar) to any function you pass (temp.baz), and it will be immutable until the bound function executes this.getScope() and stores it.


The magic is attached.


getCallStack() only works clientside in v6, so you'll need that to see this in action.

[coreys]

Originally Posted by WhiteDragon

For some reason getCallStack() isn't working in v5 so until that is fixed this only works in v6.

getCallStack() works fine for me in v5.

[WhiteDragon]

Originally Posted by coreys

getCallStack() works fine for me in v5.

Discovered that it is only clientside for v6, but also exists serverside (for both versions obviously).

[coreys]

Originally Posted by WhiteDragon

Discovered that it is only clientside for v6, but also exists serverside (for both versions obviously).

Oh, no wonder. I've never tried using it clientside.