Playing with elixir

flatten.ex

defmodule MyList do
  def flatten([]),              do: []
  def flatten([head|tail]),     do: concat (flatten head), (flatten tail)
  def flatten(other),           do: [other]

  def concat([], list),          do: list
  def concat([head|tail], list), do: [head|(concat tail, list)]

  def reverse(list),                  do: reverse list, []
  def reverse([],          reversed), do: reversed
  def reverse([head|tail], reversed), do: reverse tail, [head|reversed]
end


IO.inspect MyList.reverse MyList.flatten [1,[2,3,[[[4],5],6],7,[8]],9]