String.prototype.trimEnd()

Summary: in this tutorial, you’ll learn how to use the JavaScript String trimEnd() method to remove whitespace from the end of a string.

Introduction to JavaScript String trimEnd() method

To remove the whitespace from the end of a string, you use the trimEnd() method:

let newString = str.trimEnd();Code language: JavaScript (javascript)

The trimEnd() method returns a new string (newString) from the original string (str) with the trailing whitespace stripped.

Note that the trimEnd() method returns a new string and doesn’t change the original string.

To remove whitespace from the beginning of a string, you use the trimStart() method.

The following characters are whitespace characters in JavaScript:

• A space character (' ')
• A tab character (\t)
• A carriage return character (\r)
• A new line character. (\n)
• A vertical tab character. (\v)
• A form feed character. (\f )

JavaScript String trimEnd() method examples

Let’s take some examples of using the JavaScrip trimEnd() method.

Basic JavaScript String trimEnd() method example

The following example shows how to use the trimEnd() to remove the whitespace from the end of a string:

const str = '   JavaScript   ';
const result = str.trimEnd();

console.log({ str });
console.log({ result });Code language: JavaScript (javascript)

Output:

{ str: '   JavaScript   ' }
{ result: '   JavaScript' }Code language: JavaScript (javascript)

Removing trailing newlines

The following example uses the trimEnd() method to remove the trailing newline characters from a string:

const str = 'Hi\n\n'.trimEnd();
console.log({str});Code language: JavaScript (javascript)

Output:

{str: 'Hi'}Code language: CSS (css)

In this example, the trimEnd() method removes two newline characters (\n\n) from the end of the string.

Chaining with other string methods

Since the trimEnd() method returns a string, you can chain it with other string methods.

For example, the following uses the trimEnd() method to remove whitespace and then use the replace() method to replace specific characters in a string:

let message = 'Hello, World!  ';
let greeting = message.trimEnd().replace('World', 'JavaScript');
console.log(greeting);Code language: JavaScript (javascript)

Output:

Hello, JavaScript!

In this example, we use the trimEnd() to remove the trailing spaces, and replace() changes "World" to "JavaScript".

Alias

The trimRight() method is an alias for the trimEnd() method. This means that both methods refer to the same function object. Therefore, the trimRight() provides the same functionality as the trimRight() method.

However, it’s recommended that you use the trimEnd() method for the following reasons:

• Standardization: The trimEnd() method is part of ECMAScript whereas the trimRight() is a non-standard method. This means that the trimEnd() is more likely supported across different JavaScript environments.
• Consistency: The trimEnd() method is consistent with other string methods like padEnd(), making the code more readable and easier to understand.

Summary

• The trimEnd() method returns a new string from an original string with the ending whitespace characters stripped. The trimEnd() method doesn’t change the original string.
• The trimRight() method is an alias for the trimEnd() method.