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I have various items stored in a hash with the price as the key:

my %ITEMS = ( 29.95 => 'item 1', 38.55 => 'item 2', 45.20 => 'item 3', # Oh oh! 58.29 => 'item 4', );

If you must know, the "items" are really subscription orders for a magazine, so there is no chance that two "items" would have the same price.

The problem comes when you want to access the hash.

print $_, "\n" foreach (keys %ITEMS); __OUTPUT__ 58.29 38.55 45.2 29.95

When accessed in numeric context, the '45.20' key drops the trailing zero, but keeps it in string context. The solution I came up with was to have two entries pointing to the same string, one in numeric context and the other in string:

my %ITEMS = ( 29.95 => 'item 1', 38.55 => 'item 2', "45.20" => 'item 3', # String 45.2 => 'item 3', # Number 58.29 => 'item 4', ); print $_, "\n" foreach (keys %ITEMS); __OUTPUT__ 58.29 38.55 45.2 45.20 29.95

This solution forces you to update two hardcoded hash keys with identicial data.

Does anybody see a cleaner solution?

----
I wanted to explore how Perl's closures can be manipulated, and ended up creating an object system by accident.
-- Schemer

Note: All code is untested, unless otherwise stated


In reply to Floats with trailing zeros as a hash key by hardburn

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