add perl solution for wk-081 ch-1

Author: ccntrq

challenge-082/alexander-pankoff/perl/ch-1.pl

@@ -0,0 +1,53 @@
+#!/usr/bin/env perl
+use v5.20;
+use utf8;
+use strict;
+use warnings;
+use autodie;
+use feature qw(say signatures);
+no warnings 'experimental::signatures';
+
+use Pod::Usage;
+
+use List::Util qw(min all any);
+use Scalar::Util qw(looks_like_number);
+
+=pod
+
+=head1 SYNOPSIS
+
+This Script will print a list of common factors from M and N
+
+=head1 USAGE
+
+ch-1.pl <M> <N>
+
+=cut
+
+pod2usage(
+    -message  => "$0: Expects 2 postive numbers",
+    -exitval  => 1,
+    -verbose  => 99,
+    -sections => "USAGE|SYNOPSIS",
+  )
+  if @ARGV != 2
+  or any { !looks_like_number($_) || $_ < 1 } @ARGV;
+
+my ( $M, $N ) = @ARGV;
+say format_list( common_factors( $M, $N ) );
+
+sub common_factors ( $m, $n ) {
+    grep {
+        my $check_factor = $_;
+        all { is_factor( $check_factor, $_ ) } ( $m, $n );
+    } 1 .. min( $m, $n );
+}
+
+sub is_factor ( $divisor, $value ) {
+    return $value % $divisor == 0;
+}
+
+sub format_list(@list) {
+    return '(' . join( ', ', @list ) . ')';
+}
+