How do I enumerate the properties of a JavaScript object? [duplicate]

Answer 1

Python's dict has 'keys' method, and that is really useful. I think in JavaScript we can have something this:

function keys(){
    var k = [];
    for(var p in this) {
        if(this.hasOwnProperty(p))
            k.push(p);
    }
    return k;
}
Object.defineProperty(Object.prototype, "keys", { value : keys, enumerable:false });

EDIT: But the answer of @carlos-ruana works very well. I tested Object.keys(window), and the result is what I expected.

EDIT after 5 years: it is not good idea to extend Object, because it can conflict with other libraries that may want to use keys on their objects and it will lead unpredictable behavior on your project. @carlos-ruana answer is the correct way to get keys of an object.