Re: [Haskell-beginners] Arrow vs. function

31 Mar 2015


      Am 03/23/2015 um 09:57 PM schrieb John Wiegley:
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martin   writes:
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But that's what a function does. So what's the fundamental difference
between an arrow and a fuction?
Arrows abstract functions, allowing you to have constructions like Kleisli,
which are Arrows, but compose in the presence of effects using (<=<) rather
than (.).
I recall reading something like "under composition an arrow returns a new version of itself". It this correct? This
would indeed be something a function does not do.