Data.Tuple impoverished
Andreas Abel
andreas.abel at ifi.lmu.de
Fri Jun 15 09:59:40 CEST 2012
Hi,
the module Data.Tuple offers a sad collection of 5 functions. Many
standard functions are missing. For instance, I'd expect all the
functions of
Data.Tuple.HT (package utility-th)
to be part of Data.Tuple, which are
mapPair :: (a -> c, b -> d) -> (a, b) -> (c, d)
mapFst :: (a -> c) -> (a, b) -> (c, b)
mapSnd :: (b -> c) -> (a, b) -> (a, c)
-- swap :: (a, b) -> (b, a) -- swap is present in Data.Tuple
forcePair :: (a, b) -> (a, b)
fst3 :: (a, b, c) -> a
snd3 :: (a, b, c) -> b
thd3 :: (a, b, c) -> c
curry3 :: ((a, b, c) -> d) -> a -> b -> c -> d
uncurry3 :: (a -> b -> c -> d) -> (a, b, c) -> d
Is there a good reason why they aren't?
Cheers,
Andreas
P.S.: I have reimplemented all these functions for myself, because I use
them, but I am puzzled why they are not in the standard library.
--
Andreas Abel <>< Du bist der geliebte Mensch.
Theoretical Computer Science, University of Munich
Oettingenstr. 67, D-80538 Munich, GERMANY
andreas.abel at ifi.lmu.de
http://www2.tcs.ifi.lmu.de/~abel/
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