angular.module('demo', ['ngRoute']);

​

var demo = angular.module('demo').controller('MainCtrl', function ($scope, ChildService) {

  $scope.callService = function () {

    ChildService.someMoreAwesomeStuff();

  };

  $scope.callParentMethod = function () {

    alert('The current progress is ' + ChildService.someAwesomeStuff());

  };

});

​

​

var BaseService = (function () {

  var privateVar = 0;

  return {

    someAwesomeStuff: function () {

      if (privateVar === 42) {

        alert('You reached the answer!');

      }

      privateVar += 1;

      return privateVar;

    }

  };

}());

​

demo.factory('ChildService', function () {

  var ChildService = Object.create(BaseService);

  ChildService.someMoreAwesomeStuff = function () {

    alert('Awesome');

  };

  return ChildService;

});