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Runar Bjarnason

11 oct.
Re: [scala-debate] Re: questioning FP


On Tuesday, October 11, 2011 11:26:43 AM UTC-4, Ittay Dror wrote:
> Sure, then fetchUser is mostly non-IO, but needs to return IO[User]. Similarly, the functions that use fetchUser will
> also need to return IO[Something]. So a small implementation detail in a function can change its signature and forces
> it to be used differently (inside a for comprehension). 


It sounds like your apprehension is entirely syntactic. And the fact that a function requires IO is no small 
implementation detail. It's a very real dependency, a cause of nondeterminism, and a barrier to composition. But go 
ahead and use null instead of Option, exceptions instead of Either, mutable iterators instead of lists, and identity
 instead of IO. It's super dynamic and pragmatic.

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		martin odersky	

		11 oct.
		Re: [scala-debate] Re: questioning FP

		Let's try to keep the sarcasm down on that list please.
		 -- Martin