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Array join() method with example in JavaScript

JavaScript join() method: Here, we are going to learn about the join() method of array in JavaScript.
Submitted by IncludeHelp, on March 02, 2019

JavaScript join() method

join() method is used to join array's elements into a string. It is called with an array and returns a string with the array elements.

Syntax

array.join([separator]);

Parameters

separator it is an optional parameter, which specify the separator between the array elements, it’s default value is comma.

Return value

A string containing array elements

Sample Input/Output

Input:
var arr = [10, 20, 30, 40, 50];

Function call:
var str = arr.join();    

Output:
str = "10,20,30,40,50"

JavaScript code to join array's elements into a string using Array.join() method

<html>
<head>
<title>JavaScipt Example</title>
</head>

<body>
	<script>
		var arr1 = ["Manju", "Amit", "Abhi", "Radib"];
		var arr2 = [10, 20, 30, 40, 50];
		var arr3 = [-10, -20, 0, 10, 20];
		
		var str1 = arr1.join();
		var str2 = arr2.join();
		var str3 = arr3.join();
		
		document.write("str1: " + str1 + "<br>");
		document.write("str2: " + str2 + "<br>");
		document.write("str3: " + str3 + "<br>");
		
		document.write("printing the types of the objects...<br>");
		document.write("type of arr1: " + typeof(arr1) + "<br>");
		document.write("type of arr2: " + typeof(arr2) + "<br>");
		document.write("type of arr3: " + typeof(arr3) + "<br>");
		document.write("type of str1: " + typeof(str1) + "<br>");
		document.write("type of str2: " + typeof(str2) + "<br>");
		document.write("type of str3: " + typeof(str3) + "<br>");
	</script>
</body>
</html>

Output

str1: Manju,Amit,Abhi,Radib
str2: 10,20,30,40,50
str3: -10,-20,0,10,20
printing the types of the objects...
type of arr1: object
type of arr2: object
type of arr3: object
type of str1: string
type of str2: string
type of str3: string