Through the concept of functional inheritance, objects can be extended by using them as the context for a function call and assigning to this.
However, this approach does not seem to work as expected when dealing with the Array constructor.
var ctx = {
foo: "foo"
};
Array.call(ctx);
ctx -> Object(foo: "foo")
In contrast, this method works with other constructor-like functions.
var fakeArrayConstructor = function () {
this.length = 5;
}
fakeArrayConstructor.call(ctx);
ctx -> Object {foo: "foo", length: 5}
Is it possible that the Array constructor does not assign some of its properties using this, or is there another underlying reason? It's worth noting that much of the array functionality is stored in Array.prototype, but that's not the main focus here.