custom method

JarMixed<T> custom(
  1. String? validator(
    1. T? value
    ), [
  2. String? message
])

Implementation

JarMixed<T> custom(String? Function(T? value) validator, [String? message]) {
  return addValidator((value) {
    if (value == null) return null;
    final validationResult = validator(value);
    return validationResult ?? null;
  });
}