find.js

var users = [
  { firstName: "John", lastName: "Doe", age: 28, gender: "male" },
  { firstName: "Jane", lastName: "Doe", age: 5, gender: "female" },
  { firstName: "Jim", lastName: "Carrey", age: 54, gender: "male" },
  { firstName: "Kate", lastName: "Winslet", age: 40, gender: "female" }
];

var user = _.find(users, { lastName: "Doe", gender: "male" });
// user -> { firstName: "John", lastName: "Doe", age: 28, gender: "male" }

var underAgeUser = _.find(users, function(user) {
	return user.age < 18;
});
// underAgeUser -> { firstName: "Jane", lastName: "Doe", age: 5, gender: "female" }