The Object isFrozen() method
Find out all about the JavaScript isFrozen() method of the Object object
AI workshop
join cohort #1
Accepts an object as argument, and returns true
if the object is frozen, false
otherwise. Objects are frozen when they are return values of the Object.freeze()
function.
Example:
const dog = {}
dog.breed = 'Siberian Husky'
const myDog = Object.freeze(dog)
Object.isFrozen(dog) //true
Object.isFrozen(myDog) //true
dog === myDog //true
In the example, both dog
and myDog
are frozen. The argument passed as argument to Object.freeze()
is mutated, and can’t be un-freezed. It’s also returned as argument, hence dog
=== myDog
(it’s the same exact object).
→ Get my JavaScript Beginner's Handbook
I wrote 20 books to help you become a better developer:
- Astro Handbook
- HTML Handbook
- Next.js Pages Router Handbook
- Alpine.js Handbook
- HTMX Handbook
- TypeScript Handbook
- React Handbook
- SQL Handbook
- Git Cheat Sheet
- Laravel Handbook
- Express Handbook
- Swift Handbook
- Go Handbook
- PHP Handbook
- Python Handbook
- Linux Commands Handbook
- C Handbook
- JavaScript Handbook
- CSS Handbook
- Node.js Handbook