Shallow Copying / Cloning Objects in JavaScript

Object.assign Method

Let’s create a person object and clone it with Object.assign in below example:

const person = {
name: 'john',
age: 35,
interests: { javascript: true }
const clone = Object.assign({}, person);console.log(clone);
// { name: 'john', age: 35, interests: { javascript: true } } = 'jane';
person.age = 40;
person.interests.javascript = false;
// { name: 'jane', age: 40, interests: { javascript: false } }
// { name: 'john', age: 35, interests: { javascript: false } }

Spread Operator ( ... syntax) Method

The spread operator comes with ECMAScript 2018 standard and is now supported by most modern browsers and NodeJS by default. Its usage is pretty and simple. Just replace the cloning line in the above example with the following:

const clone = { ...person };

Lodash Method

Most of the time it is a good idea to use a utility library in our applications. Although JavaScript has gotten more and more powerful over the years, its standard toolset does not cover all of our ambitious requirements. At this point, utility libraries join the action. Lodash is a popular choice. Here’s how it’s done in _ :

const _ = require('lodash');...const clone = _.clone(person);


We demonstrated 3 ways of shallow cloning:

Object.assign({}, person); // Old-school JS
const clone = { ...person }; // Spread operator
const clone = _.clone(person); // Lodash method



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