builder_pattern.rb

class EventDirector  
  def initialize  
   @subevents = [:welcome, :intermediary,:closing]  
  end  
  def organize event  
   @subevents.each { |se| event.send(se) if event.respond_to? se }    
  end  
end  

class Wedding  
  def welcome  
   puts 'give welcome drink'  
  end   
  def intermediary  
   puts 'Exchange of vows,Exchange of rings'  
  end   
  def closing  
   puts 'closing prayer'  
  end  
end 

class TeamParty  
  def welcome  
   puts 'give complementry mocktail or beer :)'  
  end  
  def intermediary  
   puts 'Team building activities'  
  end  
  def closing  
   puts 'team photo'  
  end   
end