> > As Haskell has the standard functions fst, snd to decompose (a,b),
> > maybe, it worths to provide also
> > tuple31, tuple31, tuple31,
> > ...
> > tuple51, tuple52, tuple53, tuple54, tuple55
> >
> > for the tuples of n = 3,4,5 ?
>
> Yes! I often want fst3, snd3, thd3, at least.
>
> I suggest calling them "pi13" or "prj13" rather than "tuple31", though.
I use them too, but I would prefer "pi1_3" or "prj1_3"
so that we can keep the same convention for arbitrary length
(...for generated programs, of course)
and also,
tuple3 a b c = (a,b,c)
I prefer "tuple3" than "(,,)" , I don't manage to understand how to use "," alone.
--
Bruno Barbier
Laboratoire d'Informatique de Besancon, Universite de Franche-Comte, France
Phone/Fax : (33) 381.666.459 / (33) 381.666.450
Mailto : [EMAIL PROTECTED]
