Remove elements by index in haskell

Question

I\'m new in haskell and I\'m looking for some standard functions to work with lists by indexes.

My exact problem is that i want to remove 3 elements after every 5. If i

Answer 1

Since nobody did a version with "unfoldr", here is my take:

drop3after5 lst = concat $ unfoldr chunk lst
  where
    chunk [] = Nothing
    chunk lst = Just (take 5 lst, drop (5+3) lst)

Seems to be the shortest thus far