Is it possible to simulated Object.getOwnPropertyNames in IE8

Question

Is it possible to simulate Object.getOwnPropertyNames in IE8?

I'm trying to get this fiddle to work in IE8.

I believe the only thing left is to make a function simulating getOwnPropertyNames.

Of course other solutions to the base problem of extending a JavaScript object with object literals in IE8 is greatly appreciated.

Updated: Working fiddle which makes use of an external es5 shim script file.

Conclution: No, but you can shim Object.keys

Answer 1

No.

Object.getOwnPropertyNames() returns both enumerable and non-enumerable own properties of an object. It's not possible to iterate over non-enumerable properties in ECMAScript 3rd Edition implementations, so you can only get those that are enumerable.

It's fairly simple to write a procedure to return enumerable own properties:

var arr = [];
for (var k in obj) {
    if (obj.hasOwnProperty(k)) 
        arr.push(k); 
}

This is (more or less) the equivalent of Object.keys(). If this isn't sufficient, however, then you're out of luck.