custom method

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

Implementation

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