split.ex

defmodule Example do
  def split(list, chunk_size) do
    do_split(list, chunk_size, [[]])
  end

  defp do_split([], _chunk_size, acc) do
    acc
  end

  defp do_split([item|rest], chunk_size, [cur|acc]) do
    if length(cur) == chunk_size do
      do_split(rest, chunk_size, [[item] | [cur | acc]])
    else
      do_split(rest, chunk_size, [[item | cur] | acc])
    end
  end
end