main.dart

//poor man's data class
extension type const User(
    ({String id, String email, String firstName, String lastName}) _) {}

void main() {
  final user =
      User((id: "1", email: "[email protected]", firstName: "John", lastName: "Doe"));

  // different instantiation, same values
  final valueEqualUser =
      User((id: "1", email: "[email protected]", firstName: "John", lastName: "Doe"));

  // different values
  final valueDifferentUser = User(
      (id: "2", email: "[email protected]", firstName: "Abigail", lastName: "Moe"));

  print("user == valueEqualUser ${user == valueEqualUser}");

  print("user != valueDifferentUser ${user != valueDifferentUser}");

  print("automatic toString: ${user.toString()}");

  print("automatic hashcode: ${user.hashCode == valueEqualUser.hashCode}");

  print("different hashcode: ${user.hashCode != valueDifferentUser.hashCode}");

  // immutable, this is a compile time error:
  // user.email = ""
}