The map function in underscore.js, if called with a javascript object, returns an array of values mapped from the object's values. _.map({one: 1, two: 2, three: 3}, function(num, key){ return num * 3; }); => [3, 6, 9] is there a way to make it preserve the keys? ie, I want a function that returns {one: 3, two: 6, three: 9}