Uri wrote:
> isa
> is a key valid? (not same as in a set).
> isa usually works on fixed sets of keys
Well, in a strict sense it IS the same, as it is just one
of many possible set operations. I suppose you could say
it's a subset of sets. :-) I think you're trying to focus
on the difference between sets of strings, which are the
hash keys() directly, and sets of other things (e.g. objects),
which are hash values(). You also emphasize the const-ness
of the "isa" key set, which I think is rather too narrow.
I think a better approach would be to talk about sets in
general, the many set operations (including the *missing*
operations, which have to be kludged in Perl), the set-
related CPAN modules, and how all these things can be used.
JMHO. Sorry if someone already made this point and I missed
it.
--
John Douglas Porter
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