Getting the first index of an object

Consider:

var object = {
  foo: {},
  bar: {},
  baz: {}
}

How would I do this:

var first = object[0];
console.log(first);

Obviously, that doesn’t work because the first index is named foo,
not 0.

console.log(object['foo']);

works, but I don’t know it’s named foo. It could be named anything. I just want the first.