UserNum constructor

UserNum(
  1. String val
)

Implementation

factory UserNum(String val) {
  val = val.replaceAll(_nonDigitsRegExp, '');

  if (val.length != 16) {
    throw const FormatException('Must be 16 characters long');
  } else if (!val.isNumericOnly) {
    throw const FormatException('Must be numeric only');
  }

  return UserNum._(val);
}