loose equality in JavaScript

The loose equality operator ‘==’ allows us to compare two or more operands by converting their value to a common type first and then checking for the equality between them.

Following is the code to implement loose equality 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>Loose equality in JavaScript.</h1>
<div class="result"></div>
<br />
<button class="Btn">CLICK HERE</button>
<h3>Click on the above button see some comparisons using loose equality</h3>
   let resEle = document.querySelector(".result");
   let BtnEle = document.querySelector(".Btn");
   BtnEle.addEventListener("click", () => {
      resEle.innerHTML = "According to loose equality <br>";
      if (1 == "1") {
         resEle.innerHTML += "1 is equal to '1'<br>";
      if (undefined == null) {
         resEle.innerHTML += "undefined is equal to null <br>";


On clicking the ‘CLICK HERE’ button −

Updated on: 20-Jul-2020


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