Re: [Haskell-beginners] [m [a]] -> m [a]

On 17/08/2011 14:32, Daniel Fischer wrote:

On Wednesday 17 August 2011, 13:20:55, Guy wrote:

...

Is there a function which can do this, where m is not mplus?

I would like all the lists to be joined inside the monad with ++.

sequence gives you m [[a]], then an fmap concat (or liftM concat, since fmap requires an additional Functor constraint) flattens the resulting list to m [a].

Thanks. I was hoping that there would be some kind of fold that could do this; I take it there isn't one?