feat(challenge-162/lubos-kolouch/perl/ch-1.pl): Challenge 162 LK Perl Task 1

1 files changed, 29 insertions, 0 deletions

diff --git a/challenge-162/lubos-kolouch/perl/ch-1.pl b/challenge-162/lubos-kolouch/perl/ch-1.pl
new file mode 100644
index 0000000000..dc39b9f0f6
--- /dev/null
+++ b/challenge-162/lubos-kolouch/perl/ch-1.pl
@@ -0,0 +1,29 @@
+use strict;
+use warnings;
+
+sub calc_isbn_digit {
+    my $what = shift;
+
+    my $mul = 1;
+
+    my $sum = 0;
+
+    for my $char ( split //, $what ) {
+        next unless $char =~ /\d/;
+
+        $sum += $char * $mul;
+
+        $mul = $mul == 1 ? 3 : 1;
+    }
+
+    $sum %= 10;
+    $sum = 10 - $sum;
+    $sum = 0 if $sum == 10;
+
+    return $sum;
+}
+
+use Test::More;
+
+is( calc_isbn_digit('978-0-306-40615-?'), 7 );
+done_testing;