JSFiddle - React, Tailwind, and code Playground

by deepak sisodiya

JavaScript

// Object.defineProperty in javascript
/*  writable:false is used to set read only property */

var alert  = function (str) {
   var st = document.createTextNode(str);
   var p = document.createElement('p');
   p.appendChild(st);
   document.querySelector('body').appendChild(p);
}

var o = {};
Object.defineProperty(o, "test", {
  writable: false,
  value: 123
});
alert(o.test)

o.test = 200;
alert(o.test)