main.dart

class Credentials {
  final String givenName;
  final String familyName;
  
  Credentials(this.givenName, this.familyName);
}

void main() {
  
  final credentials1 = Credentials('Doug', 'blabla');
  final credentials2 = Credentials(null, null);
  
  final firstName1 = credentials1.givenName ?? '';
  final firstName2 = credentials2.givenName ?? '';
  
  print('FirstName for credentials1 is: $firstName1');
  print('FirstName for credentials2 is: $firstName2');
  
  
}