On Wednesday 26 January 2011 23:51:18, Michael Litchard wrote:
Here's what I'm working with, followed by what I am trying to do, and the type error I get. I'm leaving things out that I do not think are important. Let me know if I'm missing nessecary info.
obtainCookies :: IO Curl -> String -> IO () obtainCookies curl responseBody = do curl' <- curl let collectedResources = screenScraping responseBody in mapM ( curlResp curl' resourceOpts)
collectedResources
Looks like you need a flip here: in mapM (flip (curlResp curl') resourceOpts) collectedResources
return ()
If you're throwing away the results of the MapM'ed actions, use mapM_ obtainCookies curl responseBody = do curl' <- curl mapM_ (flip (curlResp curl') resourceOpts) $ screenScraping responseBody
this function does a monadic action (all I want is the cookies) and I don't need the return value. I am not sure that the final line return (), is what I want.
My primary question is this. how do I map over collectedResources correctly? Secondary question, is the return correct?
Use mapM_