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You can write functional code in perl 5 from 15 years ago... and you can do an even better job of it in perl today. CPAN has no shortage of libraries. See Higher Order Perl book (it's free too).

The "Higher-Order Perl" book by Mark Jason Dominus can be found here: http://hop.perl.plover.com/book/

Highly recommend to Perl & non-Perl programmers.

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