validator method

  1. @override
OtpCodeError? validator(
  1. String value
)
override

A function that must return a validation error if the provided value is invalid and null otherwise.

Implementation

@override
OtpCodeError? validator(String value) {
  if (value.trim().isEmpty) return OtpCodeError.empty;
  if (value.length != length) return OtpCodeError.invalidLength;

  return null;
}