App initialization with namespaces

app.js

// main.js
App = {
  // Namespaces
  Collections: {},
  Models: {},
  Views: {},
  Mixins: {},

  initialize: function() {
    this.comments = new App.Collections.Comments({ model: App.Models.Comment });
  }
};

// collections/comments.js
App.Collections.Comments = Backbone.Collection.extend({});

// models/comment.js
App.Models.Comment = Backbone.Model.extend({});