Ruby元编程编写代码的代码是什么

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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 << element') => ["10", "20", "30"] 2.0.0p247 :431 >

对比方法与块

.0.0p247 :422 >   array = ['a','b','c2.0.0p247 :423'> '] => ["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 >

2.钩子函数 inherited (更多如 module的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 "钩子函数"2.0.0p247 :466?>     end2.0.0p247 :467?>   end => nil 2.0.0p247 :468 > class MyString < String;end钩子函数 => nil 2.0.0p247 :469 >

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