How to Remove Character from End of String if Exists in Javascript
In this tutorial, you will learn how to remove character from end of string if exists in javascript. Though sentences normally just contain letters, they can also include numbers and other characters. From a developer perspective, it can be a bit tricky to remove character from end of string if exists.
There are numerous ways to remove character from end of string if exists. 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 substring()
method. We can also use charAt()
method to get the character by its index.
The length
property of a string returns the number of total characters in that string. To get the index of the last letter in the string, we just 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 character from end of string if exists 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
, andh1
). Thediv
element is just a wrapper for the rest of the elements. - The
innerText
for thebutton
element is“Get”
and for theh1
element, it is“Result”
. - We have done some basic styling using CSS and added the link to our
style.css
stylesheet inside thehead
element. - We have also included our javascript file
script.js
with ascript
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 andh1
element using thedocument.querySelector()
method and stored them inbtnGet
andoutput
variables respectively. - We have attached a
click
event listener to thebutton
element. - We have a global variable
myString
which holds a string as its value. - In the event handler function, we are getting the last character using
charAt()
method and storing it in thelastChar
variable. - We are checking whether
lastChar
is equal to character"s"
. - In case the condition returns true, we are calling the
substring()
method and passing 2 parameters, the index of the last character and 0 which is the index of the first character. To get the index of the last character, we just need to subtract 1 from the stringlength
. Finally, we will get a new string except for the last character. - In case the condition returns false, we are making no changes to the string.
- The final string is stored in the
result
variable. - We are displaying the
result
in theh1
element using theinnerText
property.
let btnGet = document.querySelector("button"); let output = document.querySelector("h1"); let myString = "Finland is one of the beautiful countries"; btnGet.addEventListener("click", () => { let lastChar = myString.charAt(myString.length - 1); let result = lastChar == 's' ? myString.substring(myString.length - 1, 0) : myString; output.innerText = result; });