[Haskell-cafe] Functions that return functions
jake.mcarthur at gmail.com
Sun Apr 12 17:45:28 EDT 2009
michael rice wrote:
> Admittedly, functions that return functions are Lispy, but perhaps there
> a Haskelly way to accomplish the same thing?
Actually, I think you will come to find that this way of thinking is
more Haskelly than it is Lispy!
import Control.Applicative ((<$), (<*>))
import Control.Arrow ((&&&))
import Control.Monad (guard)
import Data.List (unfoldr)
makeVerifier f m = (==0) . (`mod` m) . sum . zipWith f [1..] .
where nextDigit = (<$) . (snd &&& fst) . (`divMod` 10) <*>
guard . (/= 0)
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