How to use Object.assign() In Javascript

5. Using Object.fromEntries() and Object.entries()

Using Object.assign() allows you to create a new object without a specified property by copying all properties except the one you want to remove.

Syntax of object.assign():

const { age, ...rest } = Object.assign({}, details);

Example:

The below code implements the Object.assign() method to remove property from an object.

Javascript

const details = {
    name: 'Alex',
    age: 30,
    country: 'Canada'
};

console.log('orignal object', details)
const { age, ...rest } = Object.assign({}, details);
console.log(rest);

Output

orignal object { name: 'Alex', age: 30, country: 'Canada' }
{ name: 'Alex', country: 'Canada' }

Explanation:

The Object.assign({}, details) method creates a shallow copy of the details object. This prevents modification of the original details object.
Then, object destructuring is used to extract the “age” property from the copied object and assign it to the age variable. The rest of the properties are collected into a new object called rest.
As a result, the rest object contains all properties of the original details object except for the “age” property.
The rest object is then logged to the console, showing the object without the “age” property.

How to remove a key-value pair from JavaScript object?

JavaScript object is a powerful data structure that combines keys and values. Sometimes, we need to delete a specific key-value from an object. It can be done using the approaches given below.

How to remove a key-value from JavaScript object ?

There are several methods that can be used to remove a key from a JavaScript object:

Table of Content

Using the reduce() and filter() methods
Using the delete operator
Destructuring with the Rest Operator
Using Object.assign()
Using Object.fromEntries() and Object.entries()
Using _.omit method of Underscore.js library
UseCase of Remove a key from JavaScript object

How to use Object.assign() In Javascript

Syntax of object.assign():

How to remove a key-value pair from JavaScript object?

Similar Reads

Contact Us