michael rice wrote: > If you look at this stuff long enough it almost begins to make sense. > Maybe. ;-) > > I've been messing around with MonadPlus and I understand its usage > with the Maybe and List monads. Since one use of Monads is combining > computations, how can I combine a Maybe with a List? > > let m1 = Nothing > let m2 = [1] > let m3 = m1 `mplus` m2 ==> [1] --if the Maybe is Nothing, do nothing > > let m1 = Just 1 > let m2 = [] > let m3 = m1 `mplus` m2 ==> [1] --if the Maybe is not Nothing, add it > to the list > > Or am I misunderstanding combining computations? > > Michael > > > ------------------------------------------------------------------------ > > _______________________________________________ > Haskell-Cafe mailing list > Haskell-Cafe@haskell.org > http://www.haskell.org/mailman/listinfo/haskell-cafe >
Hi Michael, You'll want the Data.Maybe.listToMaybe and Data.Maybe.maybeToList functions. -- Tony Morris http://tmorris.net/ _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe