Solution to task 2

1 files changed, 59 insertions, 0 deletions

diff --git a/challenge-256/jo-37/perl/ch-2.pl b/challenge-256/jo-37/perl/ch-2.pl
new file mode 100755
index 0000000000..e2109afcc2
--- /dev/null
+++ b/challenge-256/jo-37/perl/ch-2.pl
@@ -0,0 +1,59 @@
+#!/usr/bin/perl -s
+
+use v5.24;
+use Test2::V0;
+use experimental 'signatures';
+
+our ($tests, $examples);
+
+run_tests() if $tests || $examples;	# does not return
+
+die <<EOS unless @ARGV == 2;
+usage: $0 [-examples] [-tests] [S T]
+
+-examples
+    run the examples from the challenge
+ 
+-tests
+    run some tests
+
+S T
+    two strings
+
+EOS
+
+
+### Input and Output
+
+say merge_strings(@ARGV);
+
+
+### Implementation
+
+sub merge_strings ($s, $t) {
+    my $zip;
+	while ($s || $t) {
+        $zip .= ($s && substr($s, 0, 1, '')) . ($t && substr($t, 0, 1, ''));
+    }
+    $zip;
+}
+
+
+### Examples and tests
+
+sub run_tests {
+    SKIP: {
+        skip "examples" unless $examples;
+
+        is merge_strings('abcd', '1234'), 'a1b2c3d4', 'example 1';
+        is merge_strings('abc', '12345'), 'a1b2c345', 'example 2';
+        is merge_strings('abcde', '123'), 'a1b2c3de', 'example 3';
+    }
+
+    SKIP: {
+        skip "tests" unless $tests;
+	}
+
+    done_testing;
+    exit;
+}