How i can assign values to the properties of one object to another?

Question

I have two objects like:

var a = { a1: 'a1', a2: 'a2', a3: {}}
var b = { a1: 'b1', a2: 'b2', a3: {}}

If i try use a=b As I get an object a link to b. I just want to equate the value of the properties.

"Equate" how exactly? Do you just want to overwrite `b` with a clone of the object in `a` ? — adeneo, Oct 25 '15 at 14:59
Sounds like you're trying to copy the object. See this: http://stackoverflow.com/questions/728360/most-elegant-way-to-clone-a-javascript-object — Cliff Ribaudo, Oct 25 '15 at 14:59
Possible duplicate of [What is the most efficient way to clone an object?](http://stackoverflow.com/questions/122102/what-is-the-most-efficient-way-to-clone-an-object) — Cliff Ribaudo, Oct 25 '15 at 15:00
Possible duplicate of [How to duplicate object properties in another object?](http://stackoverflow.com/questions/9362716/how-to-duplicate-object-properties-in-another-object) — Matt Browne, Oct 25 '15 at 15:08

Madara's Ghost · Answer 1 · 2015-10-25T15:11:47.667

2

Object.assign(b, a); // Assign all properties of a to b. Changing b in the process.

Be advised: Object.assign() it relatively new, and is not supported in Internet Explorer as of yet.

A polyfill for it is available here.

edited Oct 25 '15 at 15:11

answered Oct 25 '15 at 15:01

Madara's Ghost

1

There's a polyfill for it to make it work in IE as well as older browsers: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/assign#Polyfill. – Matt Browne Oct 25 '15 at 15:03
@MattBrowne Thanks, added. Next time, feel free to edit the post directly :) – Madara's Ghost Oct 25 '15 at 15:04
`var b = Object.assign({}, a);` – Tushar Oct 25 '15 at 15:10
@Tushar: That's not how I understood the question. Also, in this specific case, it really doesn't matter. – Madara's Ghost Oct 25 '15 at 15:11

score 0 · Answer 2 · answered Oct 25 '15 at 15:05

0

There are lot's of way to clone an object.

The two elegant (may not be the most efficient) ways are:

Without JQUERY - Using the serialize\deserialize way

var obj = { a1: 'a1', a2: 'a2', a3: {}}
var cloned = JSON.parse(JSON.stringify(obj));

With JQUERY - Using $.extend:

var obj = { a1: 'a1', a2: 'a2', a3: {}}
var cloned = $.extend({}, obj);

answered Oct 25 '15 at 15:05

Amir Popovich

Lodash also has extend,defaults, and merge for this sort of thing. – Brian Oct 25 '15 at 15:32

2 Answers2