Item #5
Don’t Worry About Interfaces

Ruby Uses Duck Typing If it walks like a duck, And talks like a duck, Then we can treat it like a duck. (who cares what it really is)	class Duck def talk() puts "Quack" end end class DuckLikeObject def talk() puts "Kwak" end end flock = [ Duck.new, DuckLikeObject.new ] flock.each do |d| d.talk end
No need to inherit from a common interface.