Can I use different workflows simultaneously in F#?

Question

I need my state to be passed along while being able to chain functions with the maybe workflow. Is there a way for 2 workflows to share the same context? If no, what is the way

Answer 1

As stated in the previous answer, one way to combine workflows in F# (Monads in Haskell) is by using a technique called Monad Transformers.

In F# this is really tricky, here is a project that deals with that technique.

It's possible to write the example of the previous answer by automatically combining State and Maybe (option), using that library:

#r @"c:\packages\FSharpPlus-1.0.0\lib\net45\FSharpPlus.dll"

open FSharpPlus
open FSharpPlus.Data

// Stateful computation
let computation =
    monad {
        let! x = get
        let! y = OptionT (result (Some 10))
        do! put (x + y)
        let! x = get
        return x
    }

printfn "Result: %A" (State.eval (OptionT.run computation) 1)

So this is the other alternative, instead of creating your custom workflow, use a generic workflow that will be automatically inferred (a-la Haskell).