#Looking at your Observer Pattern

class Chore
attr_accessor :name, :is_done, :by_who

def initialize(name)
	self.name = name
	self.is_done = false
end


def on_done(&callback)
	self.on_done_observers << callback

end

def done(who)
	self.by_who = who
	self.is_done = true

on_done_observers.each do |callback|
	callback.call(self)
	end
	self

end

	def on_done_observers
	@on_done_observers ||=[]
	end
end

#in pry, load/require
#c = Chore.new("wash windows")
#c.done("Freddie")
#c.on_done {|obj| puts "good job!! #{obj.by_who} did #{obj.name}"  }