hasOwnProperty

Currently I'm working on some script and I need a little help here. How can I make a [ic]window.hasOwnProperty[/ic] method?

Like this :

Code:

[panda=js]function foo(x) {
 return x;
}

window.hasOwnProperty(foo);

[ic]window.hasOwnProperty[/ic] only works for variables, as far as I known.
If you're interested to check for an existing wrapper function, maybe you can use this :

Code:

[panda=js]function foo(x) {
 return x;
}

if( foo ) {
 console.log('Hey..');
}else{
 console.log('Unavailable. LOL XD');
}

Try this...

Code:

Object.prototype.hasOwnProperty.call(window, property);

You could alternatively do this:

Code:

function windowHasProperty(x){
 return (x in window) && true || false;
}

If possible use the first method.