Backbone.js collection.clone()

The Backbone.js collection clone method returns a new instance of the collection with an identical list of models.

Syntax:

Let's take an example to demonstrate clone method.

See this example:

 <!DOCTYPE html>
   <head>
      <title> Clone Collection Example</title>
         <script src="https://code.jquery.com/jquery-2.1.3.min.js" type="text/javascript"></script>
         <script src="https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.2/underscore-min.js" type="text/javascript"></script>
         <script src="https://cdnjs.cloudflare.com/ajax/libs/backbone.js/1.1.2/backbone-min.js" type="text/javascript"></script>
   </head>
   <body>
      <script type="text/javascript">
         //'Person' is a model name
         var Person  = Backbone.Model.extend();

         //The model instance 'person' contains 'name' attribute
         var person=new Person({
            name: 'Chris Martin'
         });
         var MyCollection = Backbone.Collection.extend({
            model: Person   //model is override by specifying the "model" property of collection class
         });
         var myCollection = new MyCollection();

         // The clone() method uses get method to retrieve the 'name' attribute
         var details = myCollection.clone(person.get('name'));

         //Use a variable 'details' to assign the value for 'name' as 'John Davison'
         details.name="John Davison";
         document.write("The new instance of collection is: ",JSON.stringify(details.name));
      </script>
   </body>
</html>

Test it Now

Output:

Save the above code in clone.html file and open this file in a new browser.