[Haskell-cafe] about Haskell code written to be "too smart"

Peter Verswyvelen bugfact at gmail.com
Tue Mar 24 18:04:31 EDT 2009

On Tue, Mar 24, 2009 at 8:29 PM, Miguel Mitrofanov <miguelimo38 at yandex.ru>wrote:

> takeList ns xs = evalState (mapM (State . splitAt) ns) xs
> or even
> takeList = evalState . map (State . splitAt)
> would be much clearer than both versions.

Brilliant. As a newbie, I knew all these functions, I have used them all.
When I saw both initial implementations, I tried to write what you did, but
failed, I didn't see the pattern, failed to pick the correct functions in my
head, failed to make the puzzle.

I guess that is the real power of Haskell. In imperative languages, the more
you practice, the better you get in avoiding the imperative pitfalls. In
functional languages, more practice really results in more and more
productivity because you recognize the patterns; the design patterns are not
just thoughts but real functions you can reuse.

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