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This started as a little exercise for asavige to learn Haskell. I started by writing a simple RPN (Reverse Polish Notation) evaluator in a "natural"/"clear" (non-golf;-) style in Perl 5. Then converted it to both Perl 6 and Haskell. Being a TDD Fascist, I naturally wrote a unit test for the little evaluator function in each of the languages. Since then, starting with the addition of the piln sub-directory, this directory has morphed (in a positive way) as a place to showcase and compare how the same algorithm and its unit tests are expressed in different languages (a bit like http://www.99-bottles-of-beer.net/). Some references: http://www.perlmonks.org/?node_id=520826 (the p5/p6/haskell code was discussed/analysed there) http://perlgolf.sourceforge.net/TPR/0/5a/ (in particular, the test cases in the test program) http://en.wikipedia.org/wiki/Haskell_programming_language (example of simple Haskell RPN there) http://www.cse.unsw.edu.au/~dons/code/h4sh/ (in particular, his drop in replacement for HUnit) On CPAN: Math::RPN, Parse::RPN, Affix::Infix2Postfix (any others, please let me know). Cheers, asavige aka mad golfer (30 Dec 2005)