JSFiddle - React, Tailwind, and code Playground

by Chuan Shao

JavaScript

var o = {x:1};
console.log(Object.isExtensible(o));//true
Object.preventExtensions(o)
console.log(Object.isExtensible(o));//false
console.log(Object.isSealed(o));//false
Object.seal(o);
console.log(Object.isSealed(o));//true
console.log(Object.isFrozen(o));//false
Object.freeze(o);
console.log(Object.isFrozen(o));//true