Indexed collections in JavaScript

JavascriptWeb DevelopmentObject Oriented Programming

Arrays are the indexed collection in JavaScript as they allow us to access an element using its index.

Following is the code to implement indexed collections in 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: 20px;
      font-weight: 500;
      color: blueviolet;
<h1>Indexed collections in JavaScript</h1>
<div class="result"></div>
<br />
<button class="Btn">CLICK HERE</button>
<h3>Click on the above button to create and display the array</h3>
   let resEle = document.querySelector(".result");
   let BtnEle = document.querySelector(".Btn");
   BtnEle.addEventListener("click", () => {
      let arr = [1, 2, 3, 4, 5];
      arr.forEach((item, index) => {
         resEle.innerHTML += `arr[${index}] = ${item} <br>`;


On clicking the ‘CLICK HERE’ button −

Updated on 20-Jul-2020 08:08:10