custom method

JarString custom(String? validator(String? value, [ Map<String, dynamic>? allValues ]), [ String? message ])

Implementation

JarString custom(String? Function(String? value, [Map<String, dynamic>? allValues]) validator,
    [String? message]) {
  return addValidator((value) {
    if (value == null) return null;
    final validationResult = validator(value, getAllValues());
    return validationResult ?? null;
  });
}