Playlist

james_playlist_spec.rb

class Playlist

  attr_reader :song_list, :history
  
  def create_playlist(list)
    @song_list = list
    @song_index = 0
    @history = [current_song]
  end
  
  def next
    @song_index += 1
    @song_index = 0 if end_of_list?
    @history << current_song
  end

  def current_song
    @song_list[@song_index]
  end

  private

  def end_of_list?
    @song_index == @song_list.length
  end
  
end