[Haskell-cafe] Help with Data.Conduit.List.mapAccum

bruno at ruomad.net bruno at ruomad.net
Wed Jun 15 05:53:53 UTC 2016

I'm trying to use Data.Conduit, but I get stuck with mapAccum as how to get and retrieve the result.
If I use it, I get a simple conduit like :

testC :: ConduitM () Int IO Int
testC = Src =$= cdt where
src = CL.sourceList [1..10]
cdt = CL.mapAccum (\x s ->(x+s, x) 0

I can get the output with
testC $$ CL.consume
but how do I retrieve the accumulated sum ?


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