Type casting in JavaScript.

Type casting means conversion of one data type to another explicitly. In JavaScript some of the most common methods to convert a datatype to either string using String(), to boolean using Boolean(), or to number using Number().

Following is the code for type casting 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,.sample {
      font-size: 20px;
      font-weight: 500;
<h1>Type casting in JavaScript.</h1>
<div class="sample">44</div>
<div style="color: green;" class="result"></div>
<button class="Btn">CLICK HERE</button>
<h3>Click on the above button to convert it into string,number and boolean.</h3>
   let sampleEle = document.querySelector('.sample');
   let resEle = document.querySelector(".result");
   document.querySelector(".Btn").addEventListener("click", () => {
      resEle.innerHTML += 'String = '+ (String(sampleEle.innerHTML)+22) + '<br>';
      resEle.innerHTML += 'Number = ' + (Number(sampleEle.innerHTML)+22) + '<br>';
      resEle.innerHTML += 'Boolean = ' + Boolean(sampleEle.innerHTML) + '<br>';


The above code will produce the following output −

On clicking the ‘CLICK HERE’ button −