State Management
What is 'state' in Flutter and how is it categorized?
State is any data that can change over time and affects the UI. Flutter categorizes it as ephemeral state (...
10 XP2m
State Management
25 questions
Provider, Riverpod, BLoC, GetX, decision framework
State Management
How does the Provider package work in Flutter?
Provider wraps InheritedWidget around ChangeNotifier models. Widgets read models with context.watch() (rebu...
20 XP4m
State Management
What are the key advantages of Riverpod over Provider?
Riverpod is compile-time safe (no runtime ProviderNotFoundException), providers are global constants (no tr...
30 XP4m
State Management
What is the BLoC pattern and why is it used in Flutter?
BLoC (Business Logic Component) separates UI from business logic using streams. UI sends Events to the BLoC...
30 XP4m
State Management
What is GetX and what are its tradeoffs?
GetX is an all-in-one Flutter package providing state management (reactive Obx/GetBuilder), navigation (Get...
20 XP3m
State Management
What are the limitations of using setState for all app state?
setState only works within a single StatefulWidget. Sharing state across widgets requires lifting state up ...
20 XP2m
State Management
What are the different provider types in Riverpod?
Riverpod offers Provider (sync read-only), StateProvider (simple mutable state), FutureProvider (async one-...
30 XP4m
State Management
What are Riverpod's .family and .autoDispose modifiers?
.family creates a parameterized provider (one per unique parameter). .autoDispose destroys the provider's s...
30 XP3m
State Management
When would you choose BLoC over Riverpod (or vice versa)?
Choose BLoC for complex event-driven logic with explicit state machines and maximum testability. Choose Riv...
50 XP4m
State Management
What is the difference between mutable ChangeNotifier and immutable state?
ChangeNotifier holds mutable state and calls notifyListeners(). Immutable state (e.g., with freezed) create...
30 XP3m
State Management
How do you separate UI state from domain state?
UI state is screen-specific (loading spinners, form validation, selected tab). Domain state represents busi...
50 XP4m
State Management
How do you persist BLoC/Cubit state across app restarts?
Use HydratedBloc/HydratedCubit from the hydrated_bloc package. It automatically serializes state to local s...
30 XP3m
State Management
How are Dart Streams used in state management?
Streams deliver asynchronous sequences of values. In state management, StreamController emits state changes...
30 XP4m
State Management
When should you use context.select() instead of context.watch() in Provider?
Use context.select() to subscribe to a specific field of a model. The widget only rebuilds when that field ...
30 XP2m
State Management
What are Flutter Hooks and when would you use them?
Flutter Hooks (inspired by React Hooks) provide reusable stateful logic in StatelessWidget-like classes. us...
30 XP3m
State Management
What is unidirectional data flow and why is it important in Flutter?
Unidirectional data flow means data moves in one direction: UI dispatches actions → state management proces...
20 XP3m
State Management
How do you implement optimistic updates in Flutter?
Optimistic updates apply the expected state change immediately in the UI before the API confirms it. If the...
50 XP4m
State Management
How does dependency injection work in Flutter state management?
Flutter apps commonly use get_it (service locator), BlocProvider/RepositoryProvider (tree-scoped DI), or Ri...
30 XP3m
State Management
Why is the Equatable package used in BLoC state management?
Equatable overrides == and hashCode based on props, enabling value equality for state objects. Without it, ...
20 XP2m
State Management
What is ProviderScope in Riverpod and why is it needed?
ProviderScope is the root widget that holds all Riverpod provider state. Without it, any ref.watch() call f...
20 XP2m
State Management
What is Flutter's state restoration feature?
State restoration allows Flutter apps to restore UI state (scroll positions, form text, navigation stack) a...
50 XP3m
State Management
What is InheritedModel and how does it differ from InheritedWidget?
InheritedModel extends InheritedWidget with aspect-based selective rebuilds. Widgets declare which aspect t...
50 XP3m
State Management
What is reactive programming and how does it apply to Flutter?
Reactive programming models data as streams of values over time. Flutter's ValueNotifier, Stream, and Chang...
30 XP3m
State Management
How do you structure multiple providers in a large Flutter app?
Use MultiProvider at the app root for global state. Feature-level providers are placed above the relevant r...
30 XP3m
State Management
What is AsyncValue in Riverpod and how do you use it?
AsyncValue<T> is Riverpod's sealed class representing three states: loading, data(T), and error. It simplif...
20 XP3m