February 18, 2022

How to Remove Second Last Character from String in Javascript

By Krishnaa JavaScript Questions 0 Comments

In this tutorial, you will learn how to remove second last character from string in javascript. A sentence is a combination of multiple characters and there is a possibility that it might contain letters, numbers, or special characters.

The second last character is always located just before the last character. That means if you know the index of last character, it is easy to figure out the index of second last character.

There are numerous ways to remove second last character from string. A string consists of multiple characters and these characters in a string have a 0-based index. To remove second last character from string, 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.

The length property of a string returns the number of total characters in that string. To get the index of the second last character in the string, we just need to subtract 2 from the length and for the index of last character, we need to subtract 1 from the length .

In the following example, we have one global variable that holds a string. Upon click of a button, we will remove second last character from 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 first calling the slice() method and passing 0 and index of the second last character as parameters. As a result, we will get the complete string except for the last two characters.
We are calling the slice() method again and this time, we are passing index of the last character as a parameter. As a result, we will get only the last character.
We are joining the results of the above two slice() methods using the addition operator (+). The final 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.slice(0,myString.length - 2) +  myString.slice(myString.length - 1);
  output.innerText = result;
});

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