var evens = _.filter([1, 2, 3, 4, 5, 6], function(num){ return num % 2 == 0; }); => [2, 4, 6]
_.reduce(['x', 'y', 'z'], function(accumulator, currentItem) { return accumulator + currentItem; }); // xyz
var stooge = {name: 'moe'}; _.propertyOf(stooge)('name'); => 'moe'