example

mobile-v2/lib/presentation/home_page/cubit/home_cubit.dart

@@ -0,0 +1,15 @@
+import 'package:bloc/bloc.dart';
+
+part 'home_state.dart';
+
+class HomeCubit extends Cubit<HomeState> {
+  HomeCubit() : super(HomeState(albumCount: 0));
+
+  void increaseAlbumCount() {
+    emit(state.copyWith(albumCount: state.albumCount + 1));
+  }
+
+  void decreaseAlbumCount() {
+    emit(state.copyWith(albumCount: state.albumCount - 1));
+  }
+}

mobile-v2/lib/presentation/home_page/cubit/home_state.dart

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+part of 'home_cubit.dart';
+
+class HomeState {
+  final int albumCount;
+  HomeState({
+    required this.albumCount,
+  });
+
+  HomeState copyWith({
+    int? albumCount,
+  }) {
+    return HomeState(
+      albumCount: albumCount ?? this.albumCount,
+    );
+  }
+
+  Map<String, dynamic> toMap() {
+    return {
+      'albumCount': albumCount,
+    };
+  }
+
+  factory HomeState.fromMap(Map<String, dynamic> map) {
+    return HomeState(
+      albumCount: map['albumCount']?.toInt() ?? 0,
+    );
+  }
+
+  @override
+  String toString() => 'HomeState(albumCount: $albumCount)';
+
+  @override
+  bool operator ==(Object other) {
+    if (identical(this, other)) return true;
+
+    return other is HomeState && other.albumCount == albumCount;
+  }
+
+  @override
+  int get hashCode => albumCount.hashCode;
+}