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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