Class dispatch

dispatch.rb

class Foo
  def quack
    puts "quack"
  end
end

class Bar
  def bark
    puts "woof"
  end
end

class Dispatcher
  def dispatch obj
    puts "dispatch #{obj.class}"
    case obj
    when Foo
      obj.quack
    when Bar
      obj.bark
    else
      raise "WaT"
    end
  end
end

f = Foo.new
b = Bar.new
x = Object.new

d = Dispatcher.new
d.dispatch f
d.dispatch b
d.dispatch x