Flutter Examples

Declarative & functional Flutter code examples using Riverpod for state management.

Architecture

lib/
  features/
    counter/   — StateNotifier + immutable state
    todos/     — Sealed union state (Loading/Data/Error) + functional transitions
    weather/   — FutureProvider + Repository pattern (dependency inversion)

Key patterns

Pattern	Where
Sealed state union	TodosState — exhaustive switch in UI
Dependency inversion	WeatherRepository interface → swap impl without touching UI
Immutable state + copyWith	Todo, TodosData
autoDispose provider	weatherProvider — no memory leaks
ConsumerWidget / ConsumerStatefulWidget	all pages

Run

flutter pub get
flutter run

Examples

• Counter — basic StateNotifier, pure increment/decrement/reset
• Todos — sealed state, filter, swipe-to-delete, functional list transforms
• Weather — async data fetching, repository abstraction, error handling