99-bottles.ex

defmodule DrunkMan do

  def bottle(0), do: "no more bottles"
  def bottle(1), do: "1 bottle"
  def bottle(n), do: to_string(n) <>" bottles"

  def verse(0), do: "No more bottles of beer on the wall, no more bottles of beer.
Go to the store and buy some more, 99 bottles of beer on the wall."
  def verse(n), do: "#{DrunkMan.bottle n} of beer on the wall, #{DrunkMan.bottle n} of beer.
Take one down and pass it around, #{DrunkMan.bottle(n - 1)} of beer on the wall.\n"

end

99..0
|> Enum.map(&DrunkMan.verse/1)
|> Enum.each(&IO.puts/1)