JavaScript Array join() Method

The JavaScript Array join() Method is used to join the elements of an array into a string. The elements of the string will be separated by a specified separator and its default value is a comma(, ).

Syntax:

array.join(separator)

Parameters: This method accepts a single parameter as mentioned above and described below:

• separator: It is Optional i.e, it can be either used as a parameter or not. Its default value is a comma(, ).

Example 1: In this example, the function join() joins together the elements of the array into a string using ‘|’.

JavaScript

function func() {
    var a = [ 1, 2, 3, 4, 5, 6 ];
    console.log(a.join('|'));
}
func();

Output:

1|2|3|4|5|6

Example 2: In this example, the function join() joins together the elements of the array into a string using ‘, ‘ since it is the default value.

Javascript

var a = [1, 2, 3, 4, 5, 6];
console.log(a.join());

Output

1,2,3,4,5,6

Example 3: In this example, the function join() joins together the elements of the array into a string using ‘ ‘ (empty string).

Javascript

var a = [1, 2, 3, 4, 5, 6];
console.log(a.join(''));

Output:

123456

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

Supported Browsers: The browsers supported by JavaScript Array join() method are listed below:

• Google Chrome 1.0 and above
• Microsoft Edge 12 and above
• Mozilla Firefox 1.0
• Safari 1 and above
• Opera 4 and above

We have a Cheat Sheet on Javascript where we covered all the important topics of Javascript to check those please go through Javascript Cheat Sheet-A Basic guide to JavaScript.