Digit.len constructor

Digit.len(
  1. int len, {
  2. String? mal,
  3. String? diff,
})

Constrains the input data to the digits 0-9 and its length (number of digits) to len digits.

len the number of digits; it must be > 0. mal "malformed", the error message if non-digit characters are found; the default value is 'non-digit character(s) found'. diff the error message if the number of digits is different from len.

Implementation

Digit.len(int len, {String? mal, String? diff})
    : assert(len > 0),
      _valDig = _DigitImpl(mal, Len(len, diff: diff).call).call;