On Wed, Mar 25, 2009 at 4:09 PM, Simon Marlow <[email protected]> wrote:
> But it only works out nicely because the ordering of the components of the > pair returned by splitAt matches the ordering that the state monad expects > (and I can never remember which way around they are in Control.Monad.State). > Now you mention this, I often had to write a little function swap :: (a,b) -> (b,a) It seems many other authors have done the same in their own modules. Maybe this should be part of the Prelude? > > > Try doing it with mapAccumL, which is arguably the right abstraction, but > has the components the other way around. > > Cheers, > Simon > > _______________________________________________ > Haskell-Cafe mailing list > [email protected] > http://www.haskell.org/mailman/listinfo/haskell-cafe >
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