checkDigit method
Computes the check digit from data
.
Implementation
@override
int checkDigit(String data) {
if (data.length < 5) {
throw ArgumentError(
'Must not be null and must contain at least 5 digits',
);
}
data = '${data.substring(4)}${data.substring(0, 2)}00';
final sum = _compute(data);
return 98 - sum;
}