isValidCardExpireYear function

String? isValidCardExpireYear(
  1. String? val
)

return an error message if value does not pass the validation validation requires val: not equal null

Implementation

String? isValidCardExpireYear(String? val) {
  if (isNotNull(val) == null) {
    final year = DateTime.now().year - 2000;
    if (int.parse(val ?? "") < year) return "valid year is required";
    return null;
  }
  return isNotNull(val);
}