1 files changed, 67 insertions, 0 deletions
diff --git a/challenge-252/jo-37/perl/ch-2.pl b/challenge-252/jo-37/perl/ch-2.pl
new file mode 100755
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+++ b/challenge-252/jo-37/perl/ch-2.pl
@@ -0,0 +1,67 @@
+#!/usr/bin/perl -s
+
+use v5.26;
+use Test2::V0;
+use experimental 'signatures';
+
+our ($tests, $examples);
+
+run_tests() if $tests || $examples;	# does not return
+
+die <<EOS unless @ARGV;
+usage: $0 [-examples] [-tests] [N]
+
+-examples
+    run the examples from the challenge
+ 
+-tests
+    run some tests
+
+N
+    positive integer
+
+EOS
+
+
+### Input and Output
+
+say "(@{[uniq_sum_zero(shift)]})";
+
+
+### Implementation
+
+sub uniq_sum_zero ($n) {
+    (-$n / 2 .. -1, (0) x ($n % 2), 1 .. $n / 2);
+}
+
+
+### Examples and tests
+
+sub run_tests {
+    use List::Util qw(uniq sum);
+
+    my sub test_usz {
+        plan 2;
+        is scalar(uniq @_), scalar @_, 'uniq';
+        is sum(@_), 0, 'sum zero';
+    }
+
+    SKIP: {
+        skip "examples" unless $examples;
+
+        subtest 'example 1', \&test_usz, uniq_sum_zero(5);
+        subtest 'example 2', \&test_usz, uniq_sum_zero(3);
+        subtest 'example 3', \&test_usz, uniq_sum_zero(1);
+
+    }
+
+    SKIP: {
+        skip "tests" unless $tests;
+
+        subtest 'test 2', \&test_usz, uniq_sum_zero(2);
+        subtest 'test 4', \&test_usz, uniq_sum_zero(4);
+	}
+
+    done_testing;
+    exit;
+}