JavaScript String concat() Method

The concat() method in JavaScript is used to concatenate two or more strings and return a new string containing the concatenated values.

It does not change the original strings; instead, it returns a new string with the concatenated values.

Syntax:

str.concat(string2, string3, string4,......, stringN)

Parameters

The arguments to this function are the strings that need to be joined together. The number of arguments to this function is equal to the number of strings to be joined together.

Return value:

Returns a new string that is the combination of all the different strings passed to it as the argument.

JavaScript String concat() Method Examples

Example 1: Merging Strings with JavaScript’s concat() Method

The func() function utilizes the concat() method to merge strings together. Initially, it defines the original string “Geeks”, then concatenates it with ” for” and ” Geeks”, resulting in the output “Geeks for Geeks” when executed.

JavaScript

// JavaScript concat() method to
// merge strings together
function func() {

    // Original string
    let str = 'Geeks';

    // Joining the strings together
    let value = str.concat(' for', ' Geeks');
    console.log(value);
}

func();

Output

Geeks for Geeks

Example 2: Concatenating Multiple Strings using JavaScript’s concat() Method

The code concatenates strings str1, str2, and str3 together. result1 combines them without spaces, while result2 concatenates them with spaces. The results are then logged to the console.

JavaScript

let str1 = 'Geeks'
let str2 = 'For'
let str3 = 'Geeks'

// Concating all the strings together without spaces
let result1 = str1.concat(str2, str3)
console.log('Result without spaces: ' + result1)

// Concating all the strings together with spaces
let result2 = str1.concat(' ', str2, ' ', str3)
console.log('Result with spaces: ' + result2)

Output

Result without spaces: GeeksForGeeks
Result with spaces: Geeks For Geeks

We have a complete list of Javascript string methods, to check those please go through this Javascript String Complete reference article.

Supported Browsers: 

• Google Chrome 1 and above
• Edge 12 and above
• Firefox 1 and above
• Opera4 and above
• Safari 1 and above