Learning JavaScript? Download my free JavaScript Handbook 🔥

This method checks if we can add new properties to an object.

Any object is extensible, unless it’s been used as an argument to


const dog = {}
Object.isExtensible(dog) //true
const cat = {}
Object.isExtensible(cat) //false


Follow my new project: From Zero to App

A video-based learning project where I create a React + GraphQL app from idea to deployment! 9 free videos already out!