Mobile App Development Interview Questions in Thiruvananthapuram

const cartSlice = createSlice({ name: 'cart', initialState: { items: [] }, reducers: { addItem(state, action) { const existing = state.items.find((i) => i.id === action.payload.id); if (existing) existing.qty += 1; else state.items.push({ ...action.payload, qty: 1 }); }, removeItem(state, action) { state.items = state.items.filter((i) => i.id !== action.payload); }, }, }); export const { addItem, removeItem } = cartSlice.actions; export const selectTotal = (s) => s.cart.items.reduce((t, i) => t + i.price * i.qty, 0);

class UsersPage extends StatefulWidget { const UsersPage({super.key}); @override State<UsersPage> createState() => _UsersPageState(); } class _UsersPageState extends State<UsersPage> { late final Future<List<User>> _future = api.fetchUsers(); @override Widget build(BuildContext context) => FutureBuilder<List<User>>( future: _future, builder: (context, snap) { if (snap.connectionState != ConnectionState.done) { return const Center(child: CircularProgressIndicator()); } if (snap.hasError) return const Center(child: Text('Something went wrong')); final users = snap.data!; return ListView.builder( itemCount: users.length, itemBuilder: (_, i) => ListTile(title: Text(users[i].name)), ); }, ); }

final productsProvider = FutureProvider.autoDispose<List<Product>>((ref) { final repo = ref.watch(productRepositoryProvider); return repo.fetchProducts(); }); class ProductsView extends ConsumerWidget { const ProductsView({super.key}); @override Widget build(BuildContext context, WidgetRef ref) { final products = ref.watch(productsProvider); return products.when( loading: () => const Center(child: CircularProgressIndicator()), error: (e, _) => const Center(child: Text('Failed to load')), data: (items) => ListView(children: [for (final p in items) ListTile(title: Text(p.name))]), ); } }