stored_javascript2.js

> db.system.js.save({_id:"last_n_users", value: function(n){return db.users.find().sort({created_at:-1}).limit(n).toArray()}})
> db.eval("last_n_users(3)")
[
	{
		"_id" : ObjectId("4e8c2a00de570598c220878b"),
		"username" : "Zoloo",
		"created_at" : ISODate("2011-10-04T16:00:00Z"),
		"password" : "secret",
		"last_visited_at" : ISODate("2011-10-04T16:00:00Z")
	},
	{
		"_id" : ObjectId("4e8d0d800ec65305be4f6568"),
		"username" : "Unuruu",
		"password" : "barfoo",
		"created_at" : "Thu Oct 06 2011 10:08:00 GMT+0800 (ULAT)"
	},
	{
		"_id" : ObjectId("4e8d02690ec65305be4f6566"),
		"username" : "Darmaa",
		"created_at" : "Thu Oct 06 2011 09:20:33 GMT+0800 (ULAT)"
	}
]