Difference between Lodash _.clone() method and ‘=’ operator to copy Objects

Last Updated : 08 Jun, 2021

In this article, we will learn about the difference between using the _.clone() method in Lodash and using the ‘=’ operator to copy objects. Both of these methods are used to create a copy of an object in JavaScript. However, both work in very different ways.

Using _.clone() Method: The _.clone() method creates a new object and copies each value from the original to the new object. This creates a shallow copy of the object. Any changes to the original object do not affect the object copied.

Syntax:

_.clone( object )

Parameters: This function accepts only one parameter which is the object that needs to be copied.

Return Value: It returns the shallow copy of the given object.

Example: The below example shows that changing the original object does not affect the object copied using the _.clone() function.

Javascript

const _ = require("lodash");
 
var originalflower = {
    Name: "Rose",
    color: "Red",
    petal: 5,
};
 
// Creating a copy of the object
var copyflower = _.clone(originalflower);
 
// Printing the cloned object
console.log("Cloned object : ",
        copyflower);
 
// As this is a shallow copy, changing
// attributes of one object will not
// affect other object
originalflower.Name = "Red Rose";
 
// Printing original flower
// and cloned flower
console.log("original flower: ", 
        originalflower);
 
console.log("copy flower: ", copyflower);

Output:

Cloned object :  { Name: 'Rose', color: 'Red', petal: 5 }
original flower:  { Name: 'Red Rose', color: 'Red', petal: 5 }
copy flower:  { Name: 'Rose', color: 'Red', petal: 5 }

Using the ‘=’ operator for copying the object: In this approach, simply using the ‘=’ operator points the copied object to the original object that already exists. The changing of the original object does affect the object copied.

Example: The below example shows that changing the original object affects the object copied using the ‘=’ operator.

Javascript

const _ = require("lodash");
 
var originalFlower = {
    Name: "Rose",
    color: "Red",
    petal: 5,
};
 
// Creating a copy of originalFlower
var copyFlower = originalFlower;
console.log("Copy object : ",
    copyFlower);
 
// As both originalFlower and 
// copyFlower point to same object
// Changing one object will 
// affect other also
originalFlower.Name = "Red Rose";
 
// Printing the Name attribute
// of originalFlower and copyFlower.
console.log("The name of original flower is - ",
    originalFlower.Name);
console.log("The name of copy flower is - ",
    copyFlower.Name);

Output:

Copy object :  { Name: 'Rose', color: 'Red', petal: 5 }
The name of original flower is -  Red Rose
The name of copy flower is -  Red Rose

Difference between lodash and Underscore

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Difference between Lodash _.clone() method and ‘=’ operator to copy Objects

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