February 10, 2022

How to Remove First 4 Characters from String in Javascript

By Krishnaa JavaScript Questions 0 Comments

In this tutorial, you will learn how to remove first 4 characters from string in javascript. In any sentence, the first 4 characters play an important role because there is a possibility that it might contain letters, numbers, or special characters. Figuring out the location of first 4 characters does not require much effort.

There are numerous ways to remove the first 4 characters from a string. 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 first 4 characters, we can make use of the substring() method.

In the following example, we have one global variable that holds a string. Upon click of a button, we will remove the first 4 characters from the string 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 “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">

<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>Get</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 btnGet and output variables respectively.
We have attached a click event listener to the button element.
We have a global variable myString which holds a string as its value.
In the event handler function, we are calling the substring() method and passing 4 as a parameter which is the index number of the fifth letter “o”. As a result, we will get a new string except for the first 4 characters. The new string is 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 myString = "Hello world";

btnGet.addEventListener("click", () => {  
  let result = myString.substring(4);
  output.innerText = result;
});

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