Describe the BLoC pattern: Events, States, and widget connection
Tests UI-business separation. Strong answers cast Events as user intents, States as immutable snapshots, and BLoC as a pure reducer. Widgets listen via BlocBuilder and dispatch via context.read. Red flag: mutating state directly or using setState inside BLoC.
Tests unidirectional data flow and strict UI-business separation in Flutter. A strong answer defines Events as sealed user intents, States as immutable UI snapshots, and the BLoC as a pure async reducer mapping Events to emitted States. It then describes widget connection via BlocProvider for DI, BlocBuilder for rebuilds, and BlocListener for side effects, with events dispatched via context.read. Red flag: treating BLoC as a mutable service, exposing raw streams to UI, or calling setState inside the BLoC.
Read the original → bloclibrary.dev
- #flutter
- #bloc
- #state-management
- #architecture
- #dart
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