Javascript cloned object looses its prototype functions

Question

I am attempting to clone an object in Javascript. I have made my own \'class\' that has prototype functions.

My Problem: When I clone an object, the

Answer 1

I would instance the clone object using the constructor of the object to be cloned:

 var copy = {};

will be

 var copy = new obj.constructor();

It is a quick response and I haven't pondered about drawbacks of such solution (I'm thinking of heavy constructor) but, at a first glance it should work (I wouldn't mention (or resort to) esoteric methods as __proto__).

Update:

you should resort to object.create to solve this problem.

 var copy = {};

will be

 var copy = Object.create(obj.constructor.prototype);

In this way the original constructor is not called to create the object (think of a constructor that does an lengthy ajax call to retrieve data from server) as Object.create is equivalent to

Object.create = function (proto) {  
    function F() {}  
    F.prototype = proto;  
    return new F();  
};  

And you can use this code if the javascript engine you are using does not support this function (it was added to the ecmascript 5 specs)