Example: Import Node.js Module in
// To import our own Node JS module
var arthmetic = require("arthmetic");
//To import existing Node JS Module
//1. Import Node JS “express” module;
var arthmetic = require("express");
//2. Import Node JS “mongoose” module;
var mongoose = require("mongoose");
//This require() call is similar to import statement in Java.
// We use import import statement to import a package, class, interface etc. into another class or interface