As i was going through the life cycle of scope, I came across $digest should be called by $apply. But I want to know if possible can we enable $digest without $apply. If yes what is disadvantage
when you calls the $scope.$apply() function, it call the $rootScope.$digest(). So as a result of that, digest cycle starts from the rootScope and call all the child scopes.
you can call the digest using $scope.$digest() but this will start the cycle for child scope only. sometimes binding will not properly occur because digest cycle is not starting from the root scope.
you can check this article to get an idea about how the digest cycle works