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Today's Topics:
1. Bug in solution for problem 19 (Nicol?s Hertzulis)
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Message: 1
Date: Thu, 19 Nov 2015 05:57:37 -0300
From: Nicol?s Hertzulis <[email protected]>
To: [email protected]
Subject: [Haskell-beginners] Bug in solution for problem 19
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<CAHyojoHy9Yp41L80Xz_zVhJ7eCFfrpfj5rdvTrg=agra1oq...@mail.gmail.com>
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The penultimate solution for problem 19 of Ninety-Nine Haskell Problems
<https://wiki.haskell.org/H-99:_Ninety-Nine_Haskell_Problems> is giving the
result for the opposite of the given N.
e.g. rotate "abcdefgh" (-3) gives the result for rotate "abcdefgh" 3
Here's the problem https://wiki.haskell.org/99_questions/11_to_20 and the
solution https://wiki.haskell.org/99_questions/Solutions/19
I think it could be solved like this:
rotate xs n
| n <= 0 = (reverse . take (negate n) . reverse $ xs) ++ (reverse .
drop (negate n) . reverse $ xs)
| n > 0 = (drop n xs) ++ (take n xs)
I know it's not great, just keeping the spirit of the original solution
Is this the right list for reporting this kind of bugs?
Nicol?s
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