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本篇文章給大家分享的是有關Ruby元編程編寫代碼的代碼是什么,小編覺得挺實用的,因此分享給大家學習,希望大家閱讀完這篇文章后可以有所收獲,話不多說,跟著小編一起來看看吧。
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 >
對比方法與塊
.0.0p247 :422 > array = ['a','b','c 2.0.0p247 :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.鉤子函數 inherited (更多如 module的included,method_added,method_removed,method_undefined)
2.0.0p247 :463 > class String 2.0.0p247 :464?> def self.inherited(subclass) 2.0.0p247 :465?> puts "鉤子函數" 2.0.0p247 :466?> end 2.0.0p247 :467?> end => nil 2.0.0p247 :468 > class MyString < String;end 鉤子函數 => nil 2.0.0p247 :469 >
以上就是Ruby元編程編寫代碼的代碼是什么,小編相信有部分知識點可能是我們日常工作會見到或用到的。希望你能通過這篇文章學到更多知識。更多詳情敬請關注億速云行業資訊頻道。
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