I am still pretty new learning haskell, and find this very helpful. Not necessarily agree whether monadic solution is prefered, but I like how it shows how gene

I am still pretty new learning haskell, and find this very helpful. Not necessarily agree whether monadic solution is prefered, but I like how it shows how general monad is: it's hard to grasp the generalization from only a couple of simple examples normally found in any haskell book. I hope there are more articles like this showing how these abstract concepts can be applied in somewhat unexpected places.