Hash vs list

[Jeff Schroeder]

Thanks for the responses everyone.  Some were more detailed than I 
really needed but they gave me a lot of insight into how these sorts 
of things work (and learning something new is always a good thing).

In the end I wrote some test programs and ran them against generated 
data and the hashes won the speed test hands-down.  It seems a little 
odd to use a hash when all I really have is a huge set of "keys" (I set 
the values to 1 arbitrarily) but it's clear the hash-key lookup is 
vastly more efficient than iterating over a huge array.

Thanks again.
Jeff
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