Map a Future<InitialType> to a Future<TargetType>.

Usage

final Future<int> intFuture = Future.value(3);
final Future<String> convertedFuture =
  intFuture.map((myInt) => 'My int converted $myInt');
final String convertedResult = await convertedFuture;

Useful for converting library futures to custom model futures:

final Future<CustomModel> customFuture =
  libraryFuture.map((libraryModel) => (CustomModel(libraryModel.property)));
final customModelResult = await customFuture;