How to assign values to an array with null/empty objects in JavaScript?

JavascriptWeb DevelopmentObject Oriented Programming

Following is the code to assign values to an array with null/empty objects using JavaScript −


 Live Demo

<!DOCTYPE html>
<html lang="en">
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
   body {
      font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
   .result {
      font-size: 18px;
      font-weight: 500;
      color: rebeccapurple;
<h1>Assign values to an array with null/empty objects</h1>
<div class="result"></div>
<button class="Btn">CLICK HERE</button>
<h3>Click on the above button to assign values to empty object inside arrObj</h3>
   let resEle = document.querySelector(".result");
   let BtnEle = document.querySelector(".Btn");
   let obj = {
      firstName: "Rohan",
      lastName: "Sharma",
      address: "Delhi",
   let arrObj = [{}, {}, {}];
   BtnEle.addEventListener("click", () => {
      arrObj.forEach((item, index) => {
         item[Object.keys(obj)[index]] = obj[Object.keys(obj)[index]];


The above code will produce the following output −

On clicking the ‘CLICK HERE’ button and inspecting the output in console −

Published on 21-Jul-2020 07:23:44