It has turned out that many applications do not require monad functionality but only those of applicative functors. Monads allow you to run actions depending on the outcomes of earlier actions.
do text <- getLine if null text then putStrLn "You refuse to enter something?" else putStrLn ("You entered " ++ text)
This is obviously necessary is some cases, but in other cases it is disadvantageous.Some advantages of
- Code that uses only on the interface are more general than ones uses theApplicativeinterface, because there are more applicative functors than monads.Monad
- Programming with has a more applicative/functional feel. Especially for newbies, it may encourage functional style even when programming with effects. Monad programming withApplicativenotation encourages a more sequential & imperative style.do