# JavaScript String concat() Method

JavaScript String Reference

## Example

Join two strings:

var str1 = "Hello ";
var str2 = "world!";
var res = str1.concat(str2);

The result of res will be:

Hello world!
Try it yourself »

More "Try it Yourself" examples below.

## Definition and Usage

The concat() method is used to join two or more strings.

This method does not change the existing strings, but returns a new string containing the text of the joined strings.

## Browser Support

Method |  |  |  |  |
--- | --- | --- | --- | --- | ---
concat() | Yes | Yes | Yes | Yes | Yes

## Syntax

string.concat(string1, string2, ..., stringX)

## Parameter Values

Parameter | Description
--- | ---
string1, string2, ..., stringX | Required. The strings to be joined

## Technical Details

Return Value: | A new String, containing the text of the combined strings
JavaScript Version: | 1.2

## More Examples

## Example 2

Join three strings:

var str1 = "Hello ";
var str2 = "world!";
var str3 = " Have a nice day!";
var res = str1.concat(str2,str3);

The result of res will be:

Hello world! Have a nice day!
Try it yourself »

JavaScript String Reference

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