Does javascript have a trim function?

Example 1

Remove spaces with trim[]:

let text = "       Hello World!        ";
let result = text.trim[];

Try it Yourself »

Remove spaces with replace[] using a regular expression:

let text = "       Hello World!        ";
let result = text.replace[/^\s+|\s+$/gm,''];

Try it Yourself »

Definition and Usage

The trim[] method removes whitespace from both sides of a string.

The trim[] method does not change the original string.

Syntax

Parameters

Return Value

Browser Support

trim[] is an ECMAScript5 [ES5] feature.

ES5 [JavaScript 2009] fully supported in all browsers:

const orig = '   foo  ';
console.log[orig.trim[]]; // 'foo'

The trim[] is a built-in string function in JavaScript, which is used to trim a string. This function removes the whitespace from both the ends, i.e., start and end of the string. As the trim[] is a string method, so it is invoked by an instance of the String class. We have to create an instance of String class with which the trim[] method will be used.

Note - The trim[] method does not change the original string; it just removes the leading and trailing whitespace character.

Syntax

The syntax of trim[] method is as follows:

Here, str is a String class of object that will contain the string to be trimmed.

Parameters

The trim[] method does not have any arguments or parameters inside it.

Return Value

The string.trim[] function returns the string after removing whitespace character from that string from the beginning and end of the string.

Examples

Below are some examples, which are using trim[] function to remove the elements from it. In these examples, you will see how to use this JavaScript function. So, here are a few examples -

Example 1

In this example, we will pass a string containing whitespace at both ends.

Below is the example of the String trim[] Method. 

• Example:

JavaScript

function func[] {

    var str = "GeeksforGeeks      ";

    var st = str.trim[];

    document.write[st];

}

func[];

• Output:

GeeksForGeeks

str.trim[] method is used to remove the white spaces from both the ends of the given string.

Syntax:  

str.trim[]

Return value: 
This method returns a new string, without any of the leading or the trailing white spaces. 

Examples for the above method are provided below:

Example 1: 

var str = "GeeksforGeeks      ";
var st = str.trim[];
print[st];

Output:  

GeeksForGeeks

In this example the trim[] method removes all the leading and the trailing spaces in the string str.

Example 2:  

var str = "   GeeksforGeeks";
var st = str.trim[];
print[st];

Output:  

GeeksForGeeks

In this example the trim[] method removes all the leading and the trailing spaces in the string str.

Codes for the above method are provided below:

Program 1:  

JavaScript

function func[] {

    var str = "GeeksforGeeks      ";

    var st = str.trim[];

    document.write[st];

}

func[];

Output: 

GeeksForGeeks

Program 2:  

JavaScript

function func[] {

    var str = "   GeeksforGeeks";

    var st = str.trim[];

    document.write[st]; 

}

func[];

Output: 

GeeksForGeeks

str.trimLeft[] 
str.trimLeft[] method is used to remove the white spaces from the start of the given string. It does not affect the trailing white spaces. 

Syntax:  

str.trimLeft[]

Return value: 
This method returns a new string, without any of the leading white spaces. 

Examples for the above method are provided below:

Example 1:  

var str = "      GeeksforGeeks      ";
var st = str.trimLeft[];
print[st];

Output:  

GeeksForGeeks

In this example the trimLeft[] method removes all the leading spaces, but the trailing spaces in the string str remain as they are.

Example 2:  

var str = "   GeeksforGeeks";
var st = str.trim[];
print[st];

Output:  

GeeksForGeeks

In this example the trimLeft[] method removes all the leading spaces from str.

Codes for the above method are provided below:

Program 1:  

JavaScript

function func[] {

    var str = "GeeksforGeeks      ";

    var st = str.trimLeft[];

    document.write[st]; 

}

func[];

Output: 

GeeksForGeeks       

Program 2: 

JavaScript

function func[] {

    var str = "   GeeksforGeeks";

    var st = str.trimLeft[];

    document.write[st]; 

}

func[];

Output: 

GeeksForGeeks

str.trimRight[] 
str.trimRight[] method is used to remove the white spaces from the end of the given string. It does not affect the white spaces at the start of the string.

Syntax: 

str.trimRight[]

Return value: 
This method returns a new string, without any of the trailing white spaces. 

Examples for the above method are provided below:

Example 1:  

var str = "GeeksforGeeks      ";
var st = str.trimRight[];
print[st];

Output:  

GeeksForGeeks

In this example the trimRight[] method removes all the trailing spaces from the string str.

Example 2:  

var str = "   GeeksforGeeks";
var st = str.trimRight[];
print[st];

Output:  

     GeeksForGeeks

In this example the trimRight[] method does not remove the leading spaces from str.

Codes for the above method are provided below:

Program 1:  

JavaScript

function func[] {

    var str = "GeeksforGeeks      ";

    var st = str.trimRight[];

    document.write[st]; 

}

func[];

Output: 

GeeksForGeeks       

Program 2: 

JavaScript

function func[] {

    var str = "   GeeksforGeeks";

    var st = str.trimRight[];

    document.write[st]; 

}

func[];

Output: 

     GeeksForGeeks

Supported Browser:

• Chrome 4 and above
• Edge 12 and above
• Firefox 3.5 and above
• Internet Explorer 10 and above
• Opera 10.5 and above
• Safari 5 and above

How do you trim a character in JavaScript?

How do you trim a sentence in JavaScript?

How do you trim an array in JavaScript?

What does trim [] do in node JS?