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README  view on Meta::CPAN

        Ie it returns true if the final character of CHECKSUMMED_NUM is the
        correct checksum for the rest of the number and false if not.
        Obviously the final character does not factor into the checksum
        calculation. False will also be returned if NUM contains in an
        invalid character as defined by valid_chars(). If NUM is not valid,
        $Algorithm::LUHN_XS::ERROR will contain the reason.

        This function is equivalent to

          substr $N,length($N)-1 eq check_digit(substr $N,0,length($N)-1)

        For example, "4242 4242 4242 4242" is a valid Visa card number, that
        is provided for test purposes. The final digit is '2', which is the
        right check digit. If you change it to a '3', it's not a valid card
        number. Ie:

            is_valid('4242424242424242');   # true
            is_valid('4242424242424243');   # false

    is_valid_fast CHECKSUMMED_NUM

README.md  view on Meta::CPAN

    Ie it returns true if the final character of CHECKSUMMED\_NUM is the
    correct checksum for the rest of the number and false if not. Obviously the
    final character does not factor into the checksum calculation. False will also
    be returned if NUM contains in an invalid character as defined by
    valid\_chars(). If NUM is not valid, $Algorithm::LUHN\_XS::ERROR will contain the
    reason.

    This function is equivalent to

        substr $N,length($N)-1 eq check_digit(substr $N,0,length($N)-1)

    For example, `4242 4242 4242 4242` is a valid Visa card number,
    that is provided for test purposes. The final digit is '2',
    which is the right check digit. If you change it to a '3', it's not
    a valid card number. Ie:

        is_valid('4242424242424242');   # true
        is_valid('4242424242424243');   # false

- is\_valid\_fast CHECKSUMMED\_NUM

lib/Algorithm/LUHN_XS.pm  view on Meta::CPAN

Ie it returns true if the final character of CHECKSUMMED_NUM is the
correct checksum for the rest of the number and false if not. Obviously the
final character does not factor into the checksum calculation. False will also
be returned if NUM contains in an invalid character as defined by
valid_chars(). If NUM is not valid, $Algorithm::LUHN_XS::ERROR will contain the
reason.

This function is equivalent to

  substr $N,length($N)-1 eq check_digit(substr $N,0,length($N)-1)

For example, C<4242 4242 4242 4242> is a valid Visa card number,
that is provided for test purposes. The final digit is '2',
which is the right check digit. If you change it to a '3', it's not
a valid card number. Ie:

    is_valid('4242424242424242');   # true
    is_valid('4242424242424243');   # false

=cut