bottles_lib_7.rb

bottles_lib_7.rb

class Bottles

  def verse(num)
    case num
    when 0
      "No more bottles of beer on the wall, no more bottles of beer.\n" +
      "Go to the store and buy some more, 99 bottles of beer on the wall.\n"
    when 1 
      "1 bottle of beer on the wall, 1 bottle of beer.\n" +
      "Take it down and pass it around, no more bottles of beer on the wall.\n"
    when 2 
      "2 bottles of beer on the wall, 2 bottles of beer.\n" +
      "Take one down and pass it around, 1 bottle of beer on the wall.\n"
    when 89
      "89 bottles of beer on the wall, 89 bottles of beer.\n" +
      "Take one down and pass it around, 88 bottles of beer on the wall.\n"
    when 98
      "98 bottles of beer on the wall, 98 bottles of beer.\n" +
      "Take one down and pass it around, 97 bottles of beer on the wall.\n"
    when 99
      "99 bottles of beer on the wall, 99 bottles of beer.\n" +
      "Take one down and pass it around, 98 bottles of beer on the wall.\n"
    end
  end

  def verses(upper_bound, lower_bound)
    upper_bound
    .downto(lower_bound)
    .collect {|verse_number| verse(verse_number)}
    .join("\n")
  end

  def song
    verses(99,0)
  end

end