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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;
}
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