mixing directly into an array?

It'd be really sweet to be able to do something like this:

``` js
var users = [];
enumerable(users);

var matt = {
  name : 'matt',
  age : 23
};

var jim = {
  name : 'jim',
  age : 42
};

users.push(matt, jim);

var names = users.map('name') // [ 'matt', 'jim' ]
```
