I love this function chunksOf! It comes from Data.Text and Data.List.Split
Example of its usage in GHCI:
⇒ ghci GHCi, version 7.8.3: http://www.haskell.org/ghc/ :? for help Loading package ghc-prim ... linking ... done. Loading package integer-gmp ... linking ... done. Loading package base ... linking ... done. Prelude> import Prelude Prelude> import Data.Text Prelude Data.Text> chunksOf 2 (pack "0123456789") Loading package array-0.5.0.0 ... linking ... done. Loading package deepseq-1.3.0.2 ... linking ... done. Loading package bytestring-0.10.4.0 ... linking ... done. Loading package text-1.2.0.3 ... linking ... done. ["01","23","45","67","89"] Prelude Data.Text>
The function from Data.List takes any type list, which makes it less confusing.
Prelude Data.Text> import Data.List.Split Prelude Data.Text Data.List.Split> Data.List.Split.chunksOf 2 "0123456789" Loading package split-0.2.2 ... linking ... done. ["01","23","45","67","89"] Prelude Data.Text Data.List.Split>