[Haskell-beginners] A first try
apfelmus at quantentunnel.de
Sat Jun 25 11:39:51 CEST 2011
David Place wrote:
> Hi, Panagiotis.
> The wc program is a good choice for a learning program, but it
> reveals a long-standing weakness in Haskell: Lazy-IO. I think you
> will find that your program will get an error if you try to run wc on
> many files. You will open too many files at once.
> There is a solution called IterateeIO. It's extremely elegant and
> very good Haskell, but quite challenging to understand. So far, I
> have not found a good tutorial.
Personally, I think that lazy IO is not a weakness and works extremely
well for prototyping. In contrast, I find IterateeIO to be ugly and
non-idiomatic Haskell, since it exposes implementation details and is
not built on an algebraic "combinators & laws" approach. Being
challenging to understand is not a substitute for beauty.
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