You need a different list of patterns. Arguably, Haskell's use of monads is a pattern. It just isn't in the GoF, since it doesn't solve a problem that was a p

You need a different list of patterns. Arguably, Haskell's use of monads is a pattern. It just isn't in the GoF, since it doesn't solve a problem that was a problem for the languages the GoF was written for.