Join Elements of Array in JavaScript

In JavaScript, Array.join() method is used to join elements of the array by a given separator.

Syntax

array.join(separator)

• array is an array of elements.
• join is the array method name.
• separator is an optional string value. default value is comma.

join() method joins the elements of the array with the given separator string, and returns the result as a string. join() method does not modify the original array.

Examples

1. Join the elements of the array fruits with '-' hyphen character as separator.

let fruits = ['apple', 'banana', 'cherry'];
let separator = '-';
output = fruits.join(separator);
console.log(output);

2. Call join() method on fruits array with no separator passed.

let fruits = ['apple', 'banana', 'cherry'];
let output = fruits.join();
console.log(output);

Since comma is the default separator, we get a comma separated elements in the resulting string.