Exercise: Implement partition (bonus)

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Prompt

Implement a method, partition that creates an array of elements split into two groups, the first of which contains elements callback returns truthy for, the second of which contains elements callback returns falsey for. The callback is invoked with one argument: (value).

Definition: partition(collection, callback)

Example Usage:

var users = [

{ 'user': 'barney', 'age': 36, 'active': false },

{ 'user': 'fred', 'age': 40, 'active': true },

{ 'user': 'pebbles', 'age': 1, 'active': false }

];

partition(users, function(o) { return o.active; });

// => objects for [['fred'], ['barney', 'pebbles']]