অ্যাঙ্গুলারজেএস service

<!DOCTYPE html>
<html ng-app="app">
<body>

  <div ng-controller="app">
    {{message}}
  </div>

  <script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.8.3/angular.min.js"></script>
  <script>
    angular.module("app", [])

      .service("message", function() {
        this.getMessage = function() {
          return "প্রোগ্রামিং শিখুন";
        };
      })

      .controller("app", function($scope, message) {
        $scope.message = message.getMessage();
      });
  </script>

</body>
</html>