Tie::Hash::Rank(U3s)er Contributed Perl DocumentatiToine::Hash::Rank(3) NNNNAAAAMMMMEEEE Tie::Hash::Rank - A hash which turns values into ranking positions SSSSYYYYNNNNOOOOPPPPSSSSIIIISSSS use Tie::Hash::Rank tie my %ranks, 'Tie::Hash::Rank'; %ranks=( Adams => 78, Davies => 35, Edwards => 84, Thomas => 47 ); print $ranks{Adams}; DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN This module allows you to tie a hash such that when you retrieve values from it, you get the value's rank instead of the actual data. By default, it ranks items numerically, with the highest value getting rank 1, and given two equal values they will also get the same rank. The following named parameters are supported: ""ALGORITHM"" Use "ALGORITHM" to sort items prior to ranking them. The default is a reverse-numeric sort. Specify it thus $DATA{$a} <=> $DATA{$b} to do a normal numeric sort. Divining how to do other types of sort is left as a trivial exercise for the reader. See perldoc -f sort. ""EQUALITYSUFFIX"" Append "EQUALITYSUFFIX" to the rank of items with equal rank. The default is to have no EQUALITYSUFFIX, but a common alternative would be an "=" sign. ""EQUALITYPREFIX"" Prepend "EQUALITYPREFIX" to the rank of items with equal rank. The default is to have no EQUALITYPREFIX, but a common alternative would be an "=" sign. ""RECALCULATE"" Can be either "onstore" or "onfetch", and defaults to 'onstore'. This determines when the module recalculates the ranks. 'onstore' makes it recalculate whenever you add a value to the hash, and 'onfetch' whenever you retrieve a value. Use this option if you need to tune your hash for data which is mainly read or mainly written, although it will make very little difference for small data-sets. 2001-06-13 perl v5.6.1 1 Tie::Hash::Rank(U3s)er Contributed Perl DocumentatiToine::Hash::Rank(3) BBBBUUUUGGGGSSSS Plenty, no doubt. Please tell me if you find any. AAAAUUUUTTTTHHHHOOOORRRR David Cantrell This module originated as a grotesquely over-engineered answer to a trivial question posed by Simon Cozens as an example of something you might want to ask when testing someone's perl skillz. An earlier - and less complete - version of this module was posted on the London Perl Mongers mailing list. CCCCOOOOPPPPYYYYRRRRIIIIGGGGHHHHTTTT Copyright 2001 David Cantrell. This module is licensed under the same terms as perl itself. SSSSEEEEEEEE AAAALLLLSSSSOOOO _T_i_e_:_:_H_a_s_h(3) 2001-06-13 perl v5.6.1 2