September 20, 2022

How to Remove Trailing Zeros from Number in Javascript

By Krishnaa JavaScript Questions 0 Comments

In this tutorial, you will learn how to remove trailing zeros from number in javascript. Although zeros in a number are crucial, their placement also matters. A zero placed before any other numeric value won’t necessarily change the actual value of the number, but if it comes after any other numeric value, it will undoubtedly have some importance. From a developer perspective, it can be a bit tricky to remove trailing zeros from a number.

There are numerous ways to remove trailing zeros from a number. We are going to use the simplest approach which involves the usage of the regex pattern as well as replace() method. The replace() method searches the string for a particular value or a regex pattern and it returns a new string with the replaced values.

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

HTML & CSS

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 “Remove”.

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">

<head>
  <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">
  <title>Document</title>
</head>

<body>

  <div class="container">    
    <button>Remove</button>
    <h1>Result</h1>
  </div>

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

</html>

.container {        
    text-align: center;
}

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

Javascript

We have selected the button element and h1 element using the document.querySelector() method and stored them in btnRemove and output variables respectively.
We have attached a click event listener to the button element.
We have a global variable myNum which holds a number as its value.

We are displaying the original number in the h1 element using the innerText property.
In the event handler function, we have regex variable that holds a regex pattern /0+$/g as its value.
We are converting the number into a string using toString() method and are storing it in the myString variable.

We are calling replace() method and passing regex and empty string as parameters. As a result, it will remove trailing zeros from the string. The new string returned by this method will be stored in the result variable.
We are displaying the result in the h1 element using the innerText property.

let btnRemove = document.querySelector("button");
let output = document.querySelector("h1");

let myNum= 0252500990054750000000;

output.innerText = myNum;

btnRemove.addEventListener("click", () => {
  let regex = /0+$/g;
  let myString = myNum.toString();
  let result = myString.replace(regex, "");
  output.innerText = result;
});

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