isbn10 property

String? get isbn10

The legacy ten-character form (mod-11 check digit, X for ten), or null for a 979 ISBN, which never had one.

Implementation

String? get isbn10 {
  if (prefix.asString != bookland978) return null;

  final bodyText = body.asString;

  return '$bodyText${mod11CheckCharacter(bodyText)}';
}