Thanks for the tip about lazy = Mikio!
Wow Daniel, a very thorough description there - it seems file systems
are close to your heart :) I've taken your design and implemented a
variant on it:
http://groups.google.com/group/clojure/web/find-duplicates.clj
For this sort of domain I think memorizing is possibly a bad idea -
what if the file gets replaced - kind of defeats the purpose?
This solution only checks the minimal amount of information which is
great. But actually I suspect a more useful application would like to
check file additions also. We can avoid even more work if we are
willing to retain a uniqueness tree, however this is again susceptible
to the files changing underneath and would only work if all additions
and removals were controlled.
In retrospect, reduce-by pretty much mirrors group-by... I should have
looked at that first!
Regards,
Tim.
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