Shulou(Shulou.com)06/03 Report--

This article to share with you is about Ruby metaprogramming code is what, Xiaobian think quite practical, so share to everyone to learn, I hope you can read this article after some gains, not much to say, follow Xiaobian to see it.

1.Kernel#eval

2.0.0p247 :428 > array = ['10','20'] => ["10", "20"] 2.0.0p247 :429 > element = '30' => "30" 2.0.0p247 :430 > eval('array ["a", "b", "c\n"] 2.0.0p247 :424 > x = 'abc' => "abc" 2.0.0p247 :425 > array.instance_eval "self[1] = x" => "abc" 2.0.0p247 :426 > array => ["a", "abc", "c\n"] 2.0.0p247 :427 >2.0.0p247 :450 > def explore_array(method,*arg)2.0.0p247 :451?> ['a','b','c'].send(method, *arg)2.0.0p247 :452?> end => nil 2.0.0p247 :453 > explore_array(:size) => 3 2.0.0p247 :454 >

2. hook function inherited (more such as module included,method_added,method_removed,method_undefined)

2.0.0p247 :463 > class String2.0.0p247 :464?> def self.inherited(subclass)2.0.0p247 :465?> puts "hook function"2.0.0p247 :466?> end2.0.0p247 :467?> end => nil 2.0.0p247 :468 > class MyString

nil 2.0.0p247 :469 > The above is what Ruby metaprogramming code is, Xiaobian believes that some knowledge points may be what we see or use in our daily work. I hope you can learn more from this article. For more details, please follow the industry information channel.

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