How do I reverse a string or the words in a string?

vroom has asked for the wisdom of the Perl Monks concerning the following question:

Use reverse in scalar context. It just reverses by bytes or characters. In a list context it will reverse the elements of a list:

$revstr = reverse($str); # reversed by character
$revwords = join(" ", reverse split(/ /, $str));
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Originally posted as a Categorized Question.