[erlang-questions] Idiom for multiple case matches
Fri Nov 7 23:21:50 CET 2008
Ok, I bring it back. For this short lists function lists:member is almost
same fast since lists:member is BIF. I didn't know it and I had not
measured. Sorry. I have benchmarked it now and there is not significant
difference in R12B-3 on my Intel Core2 Duo Debian Linux laptop.
On Fri, Nov 7, 2008 at 8:40 PM, mats cronqvist <> wrote:
> "Hynek Vychodil" <> writes:
> > On Fri, Nov 7, 2008 at 3:22 PM, mats cronqvist <>
> > "Robert Virding" <> writes:
> > > A reasonable way of doing it would be:
> > >
> > > case is_vowel(Char) of
> > > true -> ... ;
> > > false -> ...
> > > end
> > is_wovel(C) -> lists:member(C,"aeiouy").
> > It is slower than Robert's solution.
> is it? so you measured it, but decided to save internet bandwidth by
> not posting the results. commendable. cause you surely wouldn't just
> guess and make a fool of yourself?
> > If performance is significant lists:member solution is worse.
> only if lists:member/1 come out near the top in your application CPU
> time profiling.
> now if you have an application where the CPU cost of sorting
> characters according to wovelness is significant, you should
> probably consider switching to C. otherwise, you should aim for code
> that communicates intent.
--Hynek (Pichi) Vychodil
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