Sorting a collection

Sorting a collection is fairly easy with Backbone as built-in methods are already available for this purpose. To sort a collection, add a comparator to the collection, which in general, is a function that can take a single model or two consecutive models for comparison, or it can be a string that points to an attribute of its model. Whenever a model is added to the collection, the comparator sorts the collection accordingly. Changing an attribute of a model later doesn't initiate the sort functionality automatically and you need to call the sort() method on the collection again to re-sort it. Let's look into a simple example of sorting a collection:

var User = Backbone.Model.extend();

var Users = Backbone.Collection.extend({
  model: User,
  comparator: 'age'
});

var users = new Users();
users.add([{
  name: 'John Doe', 
  age: 29
}, {
  name: 'Richard Smith',
  age: 35
}, {
  name: 'Swarnendu De',
  age: 29
}, {
  name: 'Emily Johnson',
  age: 25
}, {
  name: 'Sarah...