Summary: in this tutorial, you’ll learn how to use the JavaScript trim() method to remove whitespace characters from both ends of a string.
Introduction to the JavaScript trim() method #
The String.prototype.trim() returns a new string with whitespace trimmed from the beginning and end of a string.
Here’s how to use the trim() method:
let newString = str.trim();Note that the trim() method returns a completely new string and doesn’t change the original string.
In JavaScript, the following characters are whitespace:
- 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)
To remove whitespace characters from the beginning or the end of a string only, you use the trimStart() or trimEnd() method.
JavaScript trim() method examples #
Let’s take some examples of using the trim() method.
Basic JavaScript trim() examples #
The following example shows how to use the trim() to remove whitespace from both sides of a string:
let str = ' JavaScript trim ';
let result = str.trim();
console.log({str});
console.log({result});Output:
{str: ' JavaScript trim '}
{result: 'JavaScript trim'}The following example illustrates how to use the trim() method to remove the leading and trailing newlines from a string:
let str = '\nJavaScript Tutorial\n\n';
let result = str.trim();
console.log({str});
console.log({result});Output:
{str: '\nJavaScript Tutorial\n\n'}
{result: 'JavaScript Tutorial'}Chaining with other string methods #
Since the trim() method returns a string, you can chain it with other string methods. For example:
let name = ' John Doe ';
let [firstName, lastName ] = name.trim().split(' ');
console.log({firstName, lastName});Output:
{firstName: 'John', lastName: 'Doe'}In this example, we use the trim() method to remove the leading and trailing whitespace from a string and then use the split() method to split the string into two parts.
Summary #
- Use the
trim()to remove whitespace characters from both ends of a string.
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