Date's prototype methods are not enumerable. How to obtain a list of them to iterate?

Question

I want to iterate over the methods of a javascript Date object. The first attempt did not work:

var date = new Date();
for (var key in date) {
    console.log(key);
}

I've tried a few related things -- Object.keys , for example. So far I have not found a way to do it.

Answer 1

From MDN :

The Object.getOwnPropertyNames() method returns an array of all properties (including non-enumerable properties except properties that using Symbol) found directly upon a given object.

So Object.getOwnPropertyNames will produce the list I was looking for when called directly on the prototype object:

Object.getOwnPropertyNames(Date.prototype)