How to Remove Last Digit from Number in Javascript

In this tutorial, you will learn how to remove last digit from number in javascript. A number is formed by the combination of digits from 0 to 9. For a newbie developer, it can be a bit tricky to remove the last digit from the number.

There are numerous ways to remove the last digit from the number. But first of all, we have to convert a number into a string using toString() method. A string consists of multiple characters and these characters in a string have a 0-based index. To get the rest of the string after the removal of the last character, we can make use of the slice() method.

The slice() method takes 2 parameters and they basically specify starting and ending index number of characters in a string for slicing purposes. The second parameter is optional and by default, it is considered to be the length of the string.

In the following example, we have one global variable that holds a number. Upon click of a button, we will remove the last digit from the number and display the result on the screen.  Please have a look over the code example and the steps given below.


  • We have 3 elements in the HTML file (div, button, and h1). The div element is just a wrapper for the rest of the elements.
  • The innerText for the button element is “Get” and for the h1 element, it is “Result”.
  • We have done some basic styling using CSS and added the link to our style.css stylesheet inside the head element.
  • We have also included our javascript file script.js with a script tag at the bottom.
<!DOCTYPE html>
<html lang="en">

  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <link rel="stylesheet" href="style.css">


  <div class="container">    

  <script src="script.js"></script>

.container {        
    text-align: center;

button {
  margin-top: 10px;
  padding: 10px 20px;


  • We have selected the button element and h1 element using the document.querySelector() method and stored them in btnGet and output variables respectively.
  • We have attached a click event listener to the button element.
  • We have a global variable num which holds a number as its value.
  • In the event handler function, we are calling the toString() method and converting the number to a string.  Then, we are calling  slice() method and passing 0 and index of the last character as a parameter. When you subtract from 1 from the length of the string, it always give you the index of the last character.
  • As a result, we will get a new string except for the last character. The new string is then converted into a number  using parseInt() and stored in the result variable.
  • We are displaying the result in the h1 element using the innerText property.
let btnGet = document.querySelector("button");
let output = document.querySelector("h1");

let num = 5458248587;

btnGet.addEventListener("click", () => {  
  let result = num.toString().slice(0, num.toString().length - 1);
  output.innerText = parseInt(result);