Hi!
My approach using 'operational' package is equivalent to creating your own monad. The beauty of 'operational' is that you don't need to worry about the pumbling of the monad, you just need to specify what to do with your operations.
True. Approach with "operational" is really beautiful. And it is really great when you want things done. But for me, Haskell novice who wants to learn more, it hides too much. So it is probably something I would use in my code, but on the other hand I would like an exercise of doing things by hand. So first 100 monads by hand and then such libraries are useful, but also you exactly understand what are they doing - what are they automating, which process you have been doing by hand before. So thank you for your approach. I didn't know that this can be automated in so elegant way. Mitar