Grouping a list into lists of n elements in Haskell

Question

Is there an operation on lists in library that makes groups of n elements? For example: n=3

groupInto 3 [1,2,3,4,5,6,7,8,9] = [[1,2,3],[4,5,6],[7,8,9]]
         


        

Answer 1

This is ofte called "chunk" and is one of the most frequently mentioned list operations that is not in base. The package split provides such an operation though, copy and pasting the haddock documentation:

 > chunksOf 3 ['a'..'z']
 ["abc","def","ghi","jkl","mno","pqr","stu","vwx","yz"]

Additionally, against my wishes, hoogle only searches a small set of libraries (those provided with GHC or perhaps HP), but you can explicitly add packages to the search using +PKG_NAME - hoogle with Int -> [a] -> [[a]] +split gets what you want. Some people use Hayoo for this reason.