Re: [Haskell-cafe] When folding is there a way to pick out the last point being processed?

Something like the belo 'foldL_last'? You could probably do it cleaner, but I don't think there is a library function that would help any more than foldl. foldL_last :: (a -> b -> a) -> a -> [b] -> (Maybe b, a) foldL_last f x xs = foldl (\(_,a) b -> (Just b, f a b)) (Nothing, x) xs Tom On Thu, Jun 11, 2009 at 6:47 PM, Casey Hawthorne wrote:

When folding is there a way to pick out the last point being processed?

The first point can easily be picked out with (x:xs) but last xs crawls down the list. -- Regards, Casey _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe