Solution to task 2

1 files changed, 64 insertions, 0 deletions

diff --git a/challenge-269/jo-37/perl/ch-2.pl b/challenge-269/jo-37/perl/ch-2.pl
new file mode 100755
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+++ b/challenge-269/jo-37/perl/ch-2.pl
@@ -0,0 +1,64 @@
+#!/usr/bin/perl -s
+
+use v5.24;
+use Test2::V0;
+use POSIX qw(Inf NaN);
+
+our ($tests, $examples);
+
+run_tests() if $tests || $examples;	# does not return
+
+die <<EOS unless @ARGV;
+usage: $0 [-examples] [-tests] [I...]
+
+-examples
+    run the examples from the challenge
+ 
+-tests
+    run some tests
+
+I...
+    list of integers
+
+EOS
+
+
+### Input and Output
+
+say "(@{[join ', ', de(@ARGV)]})";
+
+
+### Implementation
+#
+# For details see:
+# https://github.sommrey.de/the-bears-den/2024/05/17/ch-269.html#task-2
+
+
+sub de {
+    my @arr;
+    push @{$arr[($arr[0][-1] // NaN) <= ($arr[1][-1] // Inf)]}, $_ for @_;
+    map @$_, @arr;
+}
+
+
+### Examples and tests
+
+sub run_tests {
+    SKIP: {
+        skip "examples" unless $examples;
+
+        is [de(2, 1, 3, 4, 5)], [2, 3, 4, 5, 1], 'example 1';
+        is [de(3, 2, 4)], [3, 4, 2], 'example 2';
+        is [de(5, 4, 3, 8)], [5, 3, 4, 8], 'example 3';
+    }
+
+    SKIP: {
+        skip "tests" unless $tests;
+
+        is [de(2, 1, 1, 3)], [2, 1, 1, 3], 'not unique';
+
+	}
+
+    done_testing;
+    exit;
+}