LastName constructor

LastName(String? str)

Returns a valid LastName object.

Throws ValueException:

• RequiredValueException if str is null or empty.
• InvalidValueException if str is not a valid last name.

Implementation

factory LastName(String? str) {
  if (str == null || str.isEmpty) {
    throw const RequiredValueException();
  } else if (!validate(str)) {
    throw InvalidValueException(str);
  }
  return LastName._(str);
}