Presentation layer contains the UI in the form of Widgets and also the presentation logic holders, which can be implemented as a ChangeNotifier, Bloc, Reducer, ViewModel, MobX Store… You name it! In the case of our Number Trivia App though, we’re going to use the flutter_bloc package to help us with implementing the BLoC pattern.

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Flutter TDD Clean Architecture Course [10] – Bloc Scaffolding & Input Conversion
2.70 GEEK