module.js

window.Users = (function Users() {
  // private to this "Module"
  function User(attrs) {
    this.id = attrs.id;
    this.name = attrs.name;
  };
  
  User.prototype.sayHello = function sayHello () {
    console.log("Hey! I'm" + this.name + "! Nice to meet you!");
    return this;
  }
  
  // public interface
  return {
    getById: function getById(id, cb) {
      // construct XMLHttpRequest and create a new User instance y'all!
      // super fun!
    }
  }
})();

var UserView = Backbone.View.extend({
  initialize: function (options) {
     Users.getById(options.id, this.setUser.bind(this)); 
  },
    
  setUser: function setUser(user) {
    this.user = user;
  }
});