Clearest blog post I've read on the Reader monad in Scala. This is something I can see coming to our code base very soon.
The next step for us is monad transformers in Scalaz. We are going to end up with something like Future[Reader[Writer[Problem \/ Result]]] (a few type parameters are missing there; hopefully you get the idea). Monad transformers give a way to flatten this stack of monads into a single monad, which saves a lot of unnecessary wrapping and unwrapping in code. I haven't yet worked out the all the details of using them, though. Should probably do a blog post when I do :-)
The next step for us is monad transformers in Scalaz. We are going to end up with something like Future[Reader[Writer[Problem \/ Result]]] (a few type parameters are missing there; hopefully you get the idea). Monad transformers give a way to flatten this stack of monads into a single monad, which saves a lot of unnecessary wrapping and unwrapping in code. I haven't yet worked out the all the details of using them, though. Should probably do a blog post when I do :-)