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JavaScript String concat()

Last Updated on Wednesday 5th Oct 2022

JavaScript String concat()

In this tutorial, we will learn about the JavaScript String concat() method with the help of examples.

The concat() method concatenates given arguments to the given string.

Syntax

			
					str.concat(str1, ..., strN)

			
	
  • Here str is a String.

Parameters

str & strN - One or more strings to concatenate to str.

Return Value

Returns a new string contains combined text of the strings

Example: Using concat() method

			
					"".concat(false);

"".concat({});

"".concat(null);

"".concat(4, 4);

const hello = "Hello";
const world = "World";

hello.concat(", ", world, "!"));

			
	

Output

			
					false
[object Object]
null
44
Hello, World!

			
	

Note: The assignment operators like + and += are strongly recommended over the concat() method.

Browser Support

concat() is an ECMAScript1. It is fully supported in all browsers.

Chrome IE Edge Firefox Safari Opera
Yes Yes Yes Yes Yes Yes
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