custom puts

main.rb

module Output
	def puts output
		if output.class == Person
			super output.to_o
		else
			super output
		end
	end
end


module Kernel
	prepend Output
end

include Kernel

class Person
	def initialize name, age
		@name, @age = name, age
	end

	def to_o
		"name : #{@name}, age : #{@age}"
	end

# 	def to_s
# 		"name : #{@name}, age : #{@age}"
# 	end
end

homu = Person.new "homu", 14
puts homu
# => name : homu, age : 14
puts "mami"