[Haskell-cafe] Re: Functors [Comments from OCaml Hacker Brian Hurt]

Heinrich Apfelmus apfelmus at quantentunnel.de
Sun Jan 18 04:41:25 EST 2009

Andrew Coppin wrote:
>> instance (Monad m) => Functor m where
>>   fmap f ma = do a <- ma; return (f a)
> While that's quite interesting from a mathematical point of view, how is
> this "useful" for programming purposes?

Surely, you agree that  liftM  is "useful"? Because that's the same thing.



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