Matrix transpose in Elixir

transpose.exs

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

defmodule Matrix do
  def transpose([[] | _]), do: []
  def transpose(m) do
    [Enum.map(m, &hd/1) | transpose(Enum.map(m, &tl/1))]
  end
end

IO.inspect matrix
IO.inspect Matrix.transpose(matrix)