text: var app = app || {};
  
  var TodoList = Backbone.Collection.extend({
  	model: app.Todo,
  	localStorage: new Backbone.LocalStorage('todos-backbone'),
  	completed: function(){
  		return this.filter(function(todo){
  			return todo.get('completed');
  		});
  	},
  	remaining: function(){
  		return this.without.apply(this, this.completed());
  	},
  	nextOrder: function(){
  		if (!this.length) {
  			return 1;
  		}
  		return this.last().get('order') + 1;
  	},
  	comparator: function(todo){
  		return todo.get('order');
  	}
  
  });
  
  app.Todos = new TodoList();