Blocks and scope

book.rb

class Book
  attr_accessor :title
  attr_accessor :author
  attr_reader :chapters
  attr_reader :pages
  
  def initialize
    @chapters = []
    @pages = []
  end

  def add_page page
    @pages << page
  end
  
  def mark_chapter title, startpage
    @chapters << {:title => title, :startpage => startpage}
  end
  
  def toc
    index = 0
    @chapters.each do |chapter|
      puts "Chapter #{++index}: #{chapter[:title]}    page #{chapter[:startpage]}"
    end
    nil
  end
end