Nullable Extension

Check nullable values before work with them.

let:

Check nullable variable

Future<void> login(dynamic credentials) async {
  final LoginResponse? response = await authRepository.login(credentials)
  // without extension:
  if (response != null) {
    // do some logic
    print(response.user);
  }

  // using extension:
  response?.let((LoginResponse it) {
    print(it.user);
  });
}

filterNotNull:

Convert array of nullable objects to array if non-nullable

final list = [1, null, 4, 2, null];
print(list.filterNotNull); // [1, 4, 2]