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Ruby Dup vs Clone. Tuesday, July the 28 th, 2009 Comments. This was written way before StackOverflow launched, and certainly much before it became popular. Those were the days when programmers had find out answers themselves; This has since been asked and. Questions: The Ruby docs for dup say: In general, clone and dup may have different semantics in descendent classes. While clone is used to duplicate an object, including its internal state, dup typically uses the class of the descendent object to create the new instance. But when I do some test I. You generally use clone if you want to copy an object including its internal state. This is what Rails is using with its dup method on ActiveRecord. It uses dup to allow you to duplicate a record without its "internal" state id and timestamps, and leaves clone up to Ruby to implement.

initialize_copy runs for both clone and dup, but it is called by initialize_clone and initialize_dup. Therefore, if you implement your own version of initialize_clone or initialize_dup, it is advisable to call super to make sure that initialize_copy is also called. Ruby 1.8. on dup vs clone ¶ ↑ In general, clone and dup may have different semantics in descendant classes. While clone is used to duplicate an object, including its internal state, dup typically uses the class of the descendant object to create the new instance. When using dup, any modules that the object has been extended with will not be copied.

Ruby does provide two methods for making copies of objects, including one that can be made to do deep copies. The Objectdup method will make a shallow copy of an object. To achieve this, the dup method will call the initialize_copy method of that class. What this does exactly is dependent on the class. Ruby内置的方法Objectclone和Objectdup可以用来copy一个对象,两者区别是dup只复制对象的内容,而clone还复制与对象相关联的内容,如singleton method[ruby] view plaincopyprint?s = cat def s.upcase CaT end s_dup = s.dup s_clone = s. ruby中clone和dup. 5楼 @realwol 那是你还没用过 clone 与 dup 吧? 如果写过框架, 你应该就了解了. 有时候, 要必须 frozen 对象, 防止外部修改, 要必要的时候又需要 dup 对象, 如果使用错误的调用, 必然会出错. [ruby] view plain copy Ruby内置的方法Objectclone和Objectdup可以用来copy一个对象,两者区别是dup只复制对象的内容,而clone还复制与对象相关联的内容,如singleton method [ruby] view plaincopyprint? s =.

Ruby でプロトタイプベースの OOP っぽいのをやるとき、ちょっと疑問に思ったので。dup でオブジェクトをコピーすると、特異メソッドはコピーされません。. トップ > Ruby > Ruby の dup と clone. Ruby, dup跟clone的不同, 淺層複製與深層複製. Ruby裡面,對於物件的複製有兩個方法,分別是對物件呼叫dup跟clone,這兩種有什麼不同呢?這兩種方法並非只是alias的名稱而已。.

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