array.toString

The toString() method returns a string representing the specified array and its elements.

var months = ['Jan', 'Feb', 'Mar', 'Apr'];
months.toString(); // "Jan,Feb,Mar,Apr"

Syntax

arr.toString()

Return value

A string representing the elements of the array.

Description

The Array object overrides the toString method of Object. For Array objects, the toString method joins the array and returns one string containing each array element separated by commas.

JavaScript calls the toString method automatically when an array is to be represented as a text value or when an array is referred to in a string concatenation.

ECMAScript 5 semantics

Starting in JavaScript 1.8.5 (Firefox 4), and consistent with ECMAScript 5th edition semantics, the toString() method is generic and can be used with any object. Object.prototype.toString() will be called, and the resulting value will be returned.

Specifications

Specification	Status	Comment
ECMAScript 1st Edition (ECMA-262)	Standard	Initial definition. Implemented in JavaScript 1.1.
ECMAScript 5.1 (ECMA-262) The definition of 'Array.prototype.toString' in that specification.	Standard
ECMAScript 2015 (6th Edition, ECMA-262) The definition of 'Array.prototype.toString' in that specification.	Standard
ECMAScript 2017 Draft (ECMA-262) The definition of 'Array.prototype.toString' in that specification.	Draft

Browser compatibility

See also

• Array.prototype.join()
• Object.prototype.toSource()