playing with arrays in elixir

listless.exs

defmodule Listless do
  def first([]), do: nil
  def first([head|_]) do
    head
  end

  def last([]), do: first []
  def last([head|[]]), do: head
  def last(list) do
    [_|tail] = list
    last tail
  end

  def get([], _), do: nil
  def get(list, 0), do: first list
  def get(list, index) do
    [_|tail] = list
    get tail, (index - 1)
  end
end

Listless.first []
Listless.first [1,2,3]

Listless.last []
Listless.last [1,2,3]

Listless.get [], 1
Listless.get [1,2,3], 0
Listless.get [1,2,3,4], 2