Read Higher Order Perl, think it's usable for Python & Ruby as well.. (available as a free pdf now) http://hop.perl.plover.com/book/ http://hop.perl.plover.co

Read Higher Order Perl, think it's usable for Python & Ruby as well.. (available as a free pdf now) http://hop.perl.plover.com/book/ http://hop.perl.plover.com/book/ Edit: Here's the TOC: 1) Recursion and callbacks 2) Dispatch tables 3) Caching and memoization 4) Iterators 5) From recursion to iterators 6) Infinite streams 7) Higher-order functions and currying 8) Parsing 9) Declarative programming