On 20 November 2015 at 02:30, Manuel Gómez
I haven’t found a helpful example of an Applicative that is not a Monad that is practical for a lesson.
There's ZipList [0], which depending on the type of audience might be doable. There's also Const [1], but that needs a Monoid constraint, and since you said you considered ((,) e) as not having an Applicative, which it does have with a Monoid constraint, perhaps Const isn't suitable to you for that reason. There are more interesting examples here [2]. Erik [0] https://hackage.haskell.org/package/base-4.8.1.0/docs/Control-Applicative.ht... [1] http://hackage.haskell.org/package/base-4.8.1.0/docs/Control-Applicative.htm... [2] http://stackoverflow.com/questions/7220436/good-examples-of-not-a-functor-fu...