events.rb

class EventEmitter
	def initialize
		@events = {
			"blah" => []
		}
	end

  def on(name, &handler)
    @events[name] << handler
  end

  def emit(name, *args)
    @events[name].each do |handler|
      handler.call(*args)
    end
  end
end

events = EventEmitter.new()
events.on("blah") do |b|
	puts b
end
events.emit("blah", 'hi')