Solution to task 2

1 files changed, 67 insertions, 0 deletions

diff --git a/challenge-278/jo-37/perl/ch-2.pl b/challenge-278/jo-37/perl/ch-2.pl
new file mode 100755
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+++ b/challenge-278/jo-37/perl/ch-2.pl
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+#!/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: $0 [-examples] [-tests] [STR CHR]
+
+-examples
+    run the examples from the challenge
+ 
+-tests
+    run some tests
+
+-verbose
+    enable trace output
+
+STR
+    a string
+
+CHR
+    a character (or substring)
+
+EOS
+
+
+### Input and Output
+
+say reverse_word(@ARGV);
+
+
+### Implementation
+#
+# For details see:
+# https://github.sommrey.de/the-bears-den/2024/07/19/ch-278.html#task-2
+
+
+sub reverse_word ($str, $char) {
+
+	$str =~ s#(.*?\Q$char\E)#join '', sort split //, $1#er;
+}
+
+
+### Examples and tests
+
+sub run_tests {
+    SKIP: {
+        skip "examples" unless $examples;
+        is reverse_word("challenge", "e"), "acehllnge", "example 1";
+        is reverse_word("programming", "a"), "agoprrmming", "example 2";
+        is reverse_word("champion", "b"), "champion", "example 3";
+    }
+
+    SKIP: {
+        skip "tests" unless $tests;
+
+        is reverse_word("keep", "k"), "keep", "match first";
+	}
+
+    done_testing;
+    exit;
+}