Well I don't claim to understand the mathematical basis of Monads, and I don't use arrows and just started using applicative more often. Lenses rock and I have

Well I don't claim to understand the mathematical basis of Monads, and I don't use arrows and just started using applicative more often. Lenses rock and I have used those for a long time. I do build my own Monad Transformers so maybe I am still a beginning with intermediate tendencies. :-)