[perlgeek]

Then I can highly recommend "Higher Order Perl" by M.J. Dominus (ebook for free on http://hop.perl.plover.com/book/ but the printed edition is well worth paying for too).

It essentially teaches you functional programming in Perl.

[peteretep]

It's a great book! Here's something really cool: ultra-linguist and general bad-ass Sean Burke went through it doing all the examples in ... Javascript!

http://interglacial.com/hoj/hoj.html