validateValue method

  1. @override
String? validateValue(
  1. T? valueCandidate
)
override

Validates the value. Returns null if the value is valid, otherwise an error message. Call validate() instead of this method when using the validator.

Implementation

@override
String? validateValue(T? valueCandidate) {
  if (condition(valueCandidate)) {
    return null;
  }
  return validator(valueCandidate);
}