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module Commentable def initialize @comments = [] end def add_comment(comment) @comments << comment end alias :<< :add_comment def to_s output = "Course Comments:\n-------------\n" @comments.inject(output){|output, comment| output << "#{comment}\n"} end end class CourseEvaluation include Commentable attr_accessor :title,:teacher def initialize(title,teacher) super() @title,@teacher = title, teacher end def to_s output = "Course Title: #{@title}\n" output << "Teacher: #{@teacher}\n" output << super end end cis999 = CourseEvaluation.new("Beginning Geekness","Joe") cis999.add_comment("it was fun") cis999.add_comment("it was boring") cis999 << "could have been easier" puts cis999 class Product include Commentable attr_accessor :name,:price def initialize(name,price) super() @name,@price = name, price end def to_s output = "Product Name: #{@name}\n" output << "Price: $#{@price}\n" output << super end end puts puts music_player = Product.new("MP3 Player","299.99") music_player.add_comment("works great!") music_player.add_comment("wish it had more storage") music_player << "does it support ogg" puts music_player