How to clone a JavaScript object

Question

I have an object, x. I'd like to copy it as object y, such that changes to y do not modify x. I realized that copying objects derived from built-in JavaScript objects will result in extra, unwanted properties. This isn't a problem, since I'm copying one of my own literal-constructed objects.

How to clone a JavaScript object?

Thank You!!

Answer 1

Hello,

You can clone an object and remove any reference from the previous one using a single line of code. 

Simply do:

var obj1 = { text: 'moo1' };
var obj2 = Object.create(obj1); // Creates a new clone without references

obj2.text = 'moo2'; // Only updates obj2's text property

console.log(obj1, obj2); // Outputs: obj1: {text:'moo1'}, obj2: {text:'moo2'}

For browsers / engines that do not currently support Object.create you can use this polyfill:

// Polyfill Object.create if it does not exist
if (!Object.create) {
    Object.create = function (o) {
        var F = function () {};
        F.prototype = o;
        return new F();
    };
}

Hope this works!

Thank You!!