Running $apply on $rootScope vs any other scope

Question

The $apply function can run on any scope, including $rootScope.

Are there cases when it makes a difference if I run it on my local scope or

Answer 1

/* What happens with $apply */ 
angular.module('myApp',[]).controller('MessageController', function($scope) {
    
      $scope.getMessage = function() {
        setTimeout(function() {
          $scope.$apply(function() {
            //wrapped this within $apply
            $scope.message = 'Fetched after 3 seconds'; 
            console.log('message:' + $scope.message);
          });
        }, 2000);
      }
      
      $scope.getMessage();
    
    });

      

        Delayed Message: {{message}}