Flutter type as parameter

T is the generic data type eg String, int or CustomModel etc. f is the function E is the new element returned by the function.

T is the generic data type eg String, int or CustomModel etc. f is the function E is the new element returned by the function.

The ChangeNotifierProvider works as a provider-wrapper class that creates a ChangeNotifier and automatically disposes it when ChangeNotifierProvider is removed from the widget tree . By the way, create must not be null.