The isSealed() Method in JavaScript

Learn all about the isSealed() method of the Object object in JavaScript.

The isSealed() method accepts an object as an argument and returns true if the object is sealed, and false otherwise. An object is considered sealed when it is a return value of the Object.seal() function.

Here’s an example illustrating the usage of isSealed():

const dog = {}
dog.breed = 'Siberian Husky'
const myDog = Object.seal(dog)
Object.isSealed(dog) // true
Object.isSealed(myDog) // true
dog === myDog // true

In this example, both the dog and myDog objects are sealed. When the argument is passed to the Object.seal() function, it mutates the object and prevents it from being unsealed. Additionally, the function returns the same object as the argument, making dog === myDog (they refer to the same exact object).