Cloning an Object in Node.js

Question

What is the best way to clone an object in node.js

e.g. I want to avoid the situation where:

var obj1 = {x: 5, y:5};
var obj2 = obj1;
obj2.x = 6;
con         


        

Answer 1

There is also a project on Github that aims to be a more direct port of the jQuery.extend():

https://github.com/dreamerslab/node.extend

An example, modified from the jQuery docs:

var extend = require('node.extend');

var object1 = {
    apple: 0,
    banana: {
        weight: 52,
        price: 100
    },
    cherry: 97
};

var object2 = {
    banana: {
        price: 200
    },
    durian: 100
};

var merged = extend(object1, object2);

Answer 2

There are some Node modules out there if don't want to "roll your own". This one looks good: https://www.npmjs.com/package/clone

Looks like it handles all kinds of stuff, including circular references. From the github page:

clone masters cloning objects, arrays, Date objects, and RegEx objects. Everything is cloned recursively, so that you can clone dates in arrays in objects, for example. [...] Circular references? Yep!

Answer 3

If you're using coffee-script, it's as easy as:

newObject = {}
newObject[key] = value  for own key,value of oldObject

Though this isn't a deep clone.