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
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Hi Michael, You'll want the Data.Maybe.listToMaybe and Data.Maybe.maybeToList functions. -- Tony Morris http://tmorris.net/