Lists.ex

defmodule Decision do
  def main do
    do_stuff()
  end

  def do_stuff do
    list1 = [1, 2, 3]
    list2 = [4, 5, 6]

    list3 = list1 ++ list2
    list4 = list3 -- list1
    IO.puts(6 in list4)

    [head | tail] = list3
    IO.puts("Head : #{head}")
    IO.write("Tail : ")
    IO.inspect(tail)
    IO.inspect([97, 98], charlists: :as_lists)

    Enum.each(tail, fn item ->
      IO.puts(item)
    end)

    words = ["Random", "Words", "in a", "list"]

    Enum.each(words, fn word ->
      IO.puts(word)
    end)

    display_list(words)

    IO.puts(display_list(List.delete_at(words, 1)))
    IO.puts(display_list(List.insert_at(words, 4, "Yeah")))
  end

  def display_list([word | words]) do
    IO.puts(word)
    display_list(words)
  end

  def display_list([]), do: nil
end