A small exercise in elixir. Just a function to flatten an array. Tests for this function can be found in https://gist.github.com/ronualdo/66e2339a17a7c33229ca61bda977765e

flatten.ex

defmodule Flatten do
  def flat(list=[]) do
    list
  end

  def flat([head|tail]) when is_list(head) do
    flat(head) ++ flat(tail)
  end

  def flat([head|tail]) do
    [head] ++ flat(tail)
  end
end