元编程初探

# def say_hi_to_jim#   "hi,jim"# end# def say_hi_to_li_lei#   "hi,li_lei"# end# def say_hi_to_han_mei_mei#   "hi,han_mei_mei"# end#这三个方法也可以这样写["jim","li_lei","han_mei_mei"].each do|name|  define_method "say_hi_to_#{name}" do    puts "hi,#{name}"  endend#然后就可以调用了
puts say_hi_to_jim
运行结果
vagrant@vagrant-Ubuntu-trusty-64:/vagrant/test_PRoject$ ruby Apple4.rbhi,jim