djspinmonkey

defmodule Bottles do
  def song do
    verses(99, 0)
  end

  def verses(first, last) do
    first..last
    |> Enum.map_join("\n", &verse(&1))
  end

djspinmonkey

class Bottles

  def song
    verses(99, 0)
  end

  def verses(first, last)
    first.downto(last).map { |n| verse(n) }.join("\n")
  end

djspinmonkey

def assert( bool, msg )
  puts (bool ? "Pass " : "Fail ") + msg
end

class Hash
  def destruct( &block )
    vals = block.parameters.map { |p| self[p[1]] }
    block.call(*vals)
  end
end