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Haskell 99 Problems - Numbers 15 and 16

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problem 15, Replicate the elements of a list a given number of times.
> repli "abc" 3
"aaabbbccc"

problem 16, Drop every N'th element from a list.
*Main> dropEvery "abcdefghik" 3
"abdeghk"

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  1. repli :: Int -> [a] -> [a]
  2. repli n = concatMap (replicate n)
  3.  
  4.  
  5. dropEvery :: Int -> [a] -> [a]
  6. dropEvery n [] = []
  7. dropEvery n xs 
  8.     | length xs < n = xs
  9.     | otherwise = 
  10.             let pre = (init . (take n)) xs
  11.                 post = drop n xs
  12.             in pre ++ (dropEvery n post)

URL: http://haskell.org/haskellwiki/99_questions/11_to_20

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