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

Hello, Thanks for the answer. I could of course use fold, but that would eliminate the use of mapAccum, what's the use of it then if I cannot get the result ? It's also a broader question, how to get the result of a ConduitM i o m r ? bruno On 15 Jun 2016 08:08 +0200, Baojun Wang, wrote:

Foldl from conduit combinators? On Tue, Jun 14, 2016 at 22:54wrote:

...

Hello, 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 ?

Bruno

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