You may be interested in the module Language::Functional, which implements the Haskall approach to programming; in this module, functions are treated in such a way that one can easily represent infinite series, which are only evalauted when needed.

UPDATE: L::F is the 'new & improved' version of F.pm that I was thinking about but still by the same author, thanks eduardo

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Dr. Michael K. Neylon - mneylon-pm@masemware.com || "You've left the lens cap of your mind on again, Pinky" - The Brain

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