I am the -- vote, and I voted -- because there are several
accurate answers and yours did not even meet the technical
bar of knowing what the construct you want is called
(reference), realizing that constructing code had already
been posted (eg by me), or realizing that the person was
asking about Perl's native sort function. (Indeed if you
need to roll your own then you probably don't want to use
a comparison function written in Perl!)
Had this been something like CMonks or PascalMonks I would
have been voting ++, but it is not and so I didn't.
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