front__codeschool-angular-2/js/controllers/users-index-controller.js

angular.module("noteWrangler")
  .controller("UsersIndexController", ['$scope', 'Gravatar', function ($scope, Gravatar) {
    $scope.gravatarUrl = function (email) {
      // Would be Gravatar.generate(email) with non-simplified syntax.
      return Gravatar(email);
    };
}]);