why javascript is object oriented code example

Example 1: oop js is

function Person(name) {
  this.name = name;
  this.greeting = function() {
    alert('Hi! I\'m ' + this.name + '.');
  };
}

Example 2: oops in javascript

const book = {   title: "Hippie",       author: "Paulo Coelho",     year: "2018"}

Example 3: is javascript object oriented

var js = new JavaScript();
js.isObjectOrientated = true;