var ContactModel = Backbone.Model.extend({ //extend Backbone.Model getFullName:function(){ return this.get('firstName') +' '+ this.get('lastName'); } }); var contact1Model = new ContactModel( //instantiate ContactModel instance {firstName:'John',lastName:'Doe',phone:'111-111-1111'} ); var contact2Model = new ContactModel( //instantiate ContactModel instance {firstName:'Jane',lastName:'Doe',phone:'222-222-2222'} ); //call the getFullName method on our models console.log(contact1Model.getFullName()); //logs John Doe console.log(contact2Model.getFullName()); //logs Jane Doe