[Haskell-cafe] avoid to print empty string

[Brandon Allbery]

You want:
  return ()

(Look at the type of putStrLn.)

On Mon, Jan 21, 2019 at 2:49 PM Damien Mattei <damien.mattei at gmail.com>
wrote:

> i have this in a Monad IO:
>
>  forM_ fltrdNamesBDs $ \(name,bdSidonie,bdWDS) ->
>           if (bdWDS /= bdSidonie)
>           then
>              putStrLn $  name ++ " " ++ (show (bdSidonie :: Maybe Float))
> ++ " " ++ show (bdWDS :: Maybe Float) ++ " " ++ show (bdWDS == bdSidonie)
>           else
>              putStr ""
>
> is there a way to remove the silly putStr "" that output an empty string,
> i tried with when.... but as when return Nothing in case of False it fails
> to compile
>
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-- 
brandon s allbery kf8nh
allbery.b at gmail.com
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