AngularJS kursus, custom directive isolate scope with controller

isolateScopeWithController.js

angular.module('directivesModule')	
.directive('isolateScopeWithController',function(){	
    return	{
        restrict:'EA',
        scope:	{datasource:'=',add:'&'},	
        controller:	function($scope){	
            function init()	{	
                $scope.customers=angular.copy($scope.datasource);	
            }	
            init();	
            $scope.addCustomer=function(){	
                //Call	external scope's function
                $scope.add();	
                //Add new customer to directive scope
                $scope.customers.push({…});	
            };	
        },	
        template: '<button ng-click="addCustomer()">Change	Data</button><ul>' +	
		  '<li ng-repeat="cust in customers">{{ cust.name }}</li></ul>'
    };	
}); 
<div isolate-scope-with-controller></div>