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package Acme::NAHCNUJ::Utils;

use 5.006;
use strict;
use warnings;

use Exporter qw(import);
our @EXPORT = qw(sum);

=head1 NAME

Acme::NAHCNUJ::Utils - Answer for exercise 21.3 of the book "Intermediate Perl"

=head1 VERSION

Version 0.01

=cut

our $VERSION = '0.01';


=head1 SYNOPSIS

Calculates the summation of list.

    use Acme::NAHCNUJ::Utils;

    my $foo = sum(1, 2, 3); #=> 6

=head1 EXPORT

A list of functions that can be exported.  You can delete this section
if you don't export anything, such as for a purely object-oriented module.

=head1 SUBROUTINES/METHODS

=head2 sum

Calculates the summation of list.

=cut

sub sum {
    my @numbers = grep { defined $_ } @_;
    my $sum;
    $sum += $_ for @numbers;
    $sum;
}

=head1 AUTHOR

Junichi Hayashi, C<< <j-hayasi at ist.osaka-u.ac.jp> >>

=head1 BUGS

Please report any bugs or feature requests to C<bug-acme-nahcnuj-utils at rt.cpan.org>, or through
the web interface at L<https://rt.cpan.org/NoAuth/ReportBug.html?Queue=Acme-NAHCNUJ-Utils>.  I will be notified, and then you'll
automatically be notified of progress on your bug as I make changes.




=head1 SUPPORT

You can find documentation for this module with the perldoc command.

    perldoc Acme::NAHCNUJ::Utils


You can also look for information at:

=over 4

=item * RT: CPAN's request tracker (report bugs here)

L<https://rt.cpan.org/NoAuth/Bugs.html?Dist=Acme-NAHCNUJ-Utils>

=item * AnnoCPAN: Annotated CPAN documentation

L<http://annocpan.org/dist/Acme-NAHCNUJ-Utils>

=item * CPAN Ratings

L<https://cpanratings.perl.org/d/Acme-NAHCNUJ-Utils>

=item * Search CPAN

L<https://metacpan.org/release/Acme-NAHCNUJ-Utils>

=back


=head1 ACKNOWLEDGEMENTS


=head1 LICENSE AND COPYRIGHT

Copyright 2018 Junichi Hayashi.

This program is free software; you can redistribute it and/or modify it
under the terms of the the Artistic License (2.0). You may obtain a
copy of the full license at:

L<http://www.perlfoundation.org/artistic_license_2_0>

Any use, modification, and distribution of the Standard or Modified
Versions is governed by this Artistic License. By using, modifying or
distributing the Package, you accept this license. Do not use, modify,
or distribute the Package, if you do not accept this license.

If your Modified Version has been derived from a Modified Version made
by someone other than you, you are nevertheless required to ensure that
your Modified Version complies with the requirements of this license.

This license does not grant you the right to use any trademark, service
mark, tradename, or logo of the Copyright Holder.

This license includes the non-exclusive, worldwide, free-of-charge