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notes controller
// We create a "provider", which will store a reference to NotesController.
final notesProvider = StateNotifierProvider((ref) => NotesController());
class NotesController extends StateNotifier<NotesState> {
NotesController() : super(NotesState.initial());
void addNote() {
var notes = state.notes.concat(state.input);
state = state.copyWith(notes: notes, input: '');
void updateInput(String input) => state = state.copyWith(input: input);
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