Solution to task 1

1 files changed, 64 insertions, 0 deletions

diff --git a/challenge-096/jo-37/perl/ch-1.pl b/challenge-096/jo-37/perl/ch-1.pl
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+++ b/challenge-096/jo-37/perl/ch-1.pl
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+#!/usr/bin/perl -s
+
+use v5.16;
+use Test2::V0;
+
+our ($tests, $examples);
+
+run_tests() if $tests || $examples;    # does not return
+
+say(<<EOS), exit unless @ARGV;
+usage: $0 [-examples] [-tests] [--] [phrase...]
+
+-examples
+    run the examples from the challenge
+ 
+-tests
+    run some tests
+
+phrase...
+   phrases to be reversed.  All given phrases will be concatenated.
+
+EOS
+
+
+### Input and Output
+
+say qq{"@{reverse_words(@ARGV)}"};
+
+
+### Implementation
+
+# Return a reference to an array containing the reversed list of words.
+sub reverse_words {
+    local $_ = "@_";
+    # Special split behaviour:
+    # - removes leading whitspace when PATTERN is omitted or ' '
+    # - uses /\s+/ as split pattern when omitted or ' '
+    # - strips trailing empty fields when LIMIT is omitted or zero
+    [reverse split];
+}
+
+
+### Examples and tests
+
+sub run_tests {
+    SKIP: {
+        skip "examples" unless $examples;
+        is reverse_words('The Weekly Challenge'),
+            [qw(Challenge Weekly The)], 'Example 1';
+        is reverse_words('    Perl and   Raku are  part of the same family  '),
+            [qw(family same the of part are Raku and Perl)], 'Example 2';
+    }
+
+    SKIP: {
+        skip "tests" unless $tests;
+        is reverse_words(' a b'), [qw(b a)], 'strip leading whitespace';
+        is reverse_words('a b '), [qw(b a)], 'strip trailing whitspace';
+        is reverse_words('a  b'), [qw(b a)], 'trim intermediate whitespace';
+        is reverse_words(qw(a b c)), [qw(c b a)], 'multiple args';
+    }
+
+    done_testing;
+    exit;
+}