BLoC Pattern
What is the difference between Bloc and Cubit?
Cubit is a simplified Bloc that emits states directly via methods, with no Events. Bloc requires an explici...
20 XP3m
BLoC Pattern
15 questions
Deep dive: events, transformers, testing, patterns
BLoC Pattern
When do you use BlocBuilder, BlocListener, and BlocConsumer?
BlocBuilder: rebuilds UI on state changes. BlocListener: side effects (navigation, snackbars) without rebui...
20 XP3m
BLoC Pattern
What are event transformers in Bloc?
Event transformers control how a Bloc processes multiple events of the same type. The default is sequential...
50 XP4m
BLoC Pattern
What is BlocObserver and how do you use it?
BlocObserver is a global hook that intercepts every Bloc/Cubit event, state transition, and error in the ap...
30 XP3m
BLoC Pattern
How do you provide and access a Bloc in the widget tree?
Use BlocProvider to create and provide a Bloc to descendants. Access it with context.read<MyBloc>() (no reb...
20 XP3m
BLoC Pattern
How do Blocs use Streams and Emitter internally?
Bloc is built on Dart Streams. Each on<Event> handler receives an Emitter<State> that wraps emit() with can...
50 XP4m
BLoC Pattern
Why use sealed classes for Bloc states?
Sealed classes (Dart 3.0+) make state unions exhaustive. The compiler forces you to handle every subclass i...
30 XP3m
BLoC Pattern
How do you test a Bloc using bloc_test?
Use blocTest() from the bloc_test package. Provide: bloc (factory), seed (initial state), act (events to ad...
30 XP4m
BLoC Pattern
How do you implement Bloc-to-Bloc communication?
Never hold a direct reference from one Bloc to another. Instead, use a shared Repository stream (both Blocs...
50 XP4m
BLoC Pattern
What is HydratedBloc and how does it persist state?
HydratedBloc automatically saves and restores Bloc state to/from local storage. Override toJson() and fromJ...
30 XP3m
BLoC Pattern
How do you implement form validation with Bloc?
Model each form field as a Formz input with pure/dirty validation. Each field change dispatches an event. T...
30 XP4m
BLoC Pattern
How do you implement pagination with Bloc?
Model pagination state with hasReachedMax flag, current items list, and status. Add a FetchNextPage event. ...
50 XP5m
BLoC Pattern
How do you use Freezed to model immutable Bloc states?
Freezed generates immutable data classes with copyWith(), == and hashCode, pattern matching (when/map), and...
30 XP4m
BLoC Pattern
What is RepositoryProvider and how does it relate to BlocProvider?
RepositoryProvider makes a repository available to all widgets and Blocs below it in the tree. BlocProvider...
20 XP3m
BLoC Pattern
How do you handle navigation from inside a Bloc?
Navigation is a UI concern — Blocs should not call Navigator.push(). Instead, emit a navigation state (e.g....
50 XP4m