itterable_extension.dart

extension IterableExtension<T> on Iterable<T?> {
  List<T> makeSafe() {
    return where((element) => element != null).cast<T>().toList();
  }
}

class VB10ViewModel {
  List<User> dummyListToSafe() {
    final userList = <User?>[
      const User(),
      null,
      const User(),
      null,
      const User()
    ];

    final safeUserList = userList.makeSafe();
    return safeUserList;
  }
}

class VB10View extends StatelessWidget {
  const VB10View({super.key});
  static final viewModel = VB10ViewModel();
  @override
  Widget build(BuildContext context) {
    return ListView.builder(
      itemCount: viewModel.dummyListToSafe().length,
      itemBuilder: (BuildContext context, int index) {
        return UserCard(user:viewModel.dummyListToSafe()[index]);
      },
    );
  }
}