QrNumeric.fromString constructor

QrNumeric.fromString(String numberString)

Implementation

factory QrNumeric.fromString(String numberString) {
  final newList = Uint8List(numberString.length);
  var count = 0;
  for (var char in numberString.codeUnits) {
    if (char < 0x30 || char > 0x39) {
      throw ArgumentError('string can only contain alpha numeric 0-9');
    }
    newList[count++] = char - 0x30;
  }
  return QrNumeric._(newList);
}