Web/JavaScript/Reference/Global objects/Symbol/valueOf

The valueOf() method returns the primitive value of a Symbol object.

Syntax

Symbol().valueOf()

Return value

The primitive value of the specified Symbol object.

Description

The valueOf() method of Symbol returns the primitive value of a Symbol object as a Symbol data type.

JavaScript calls the valueOf() method to convert an object to a primitive value. You rarely need to invoke the valueOf() method yourself; JavaScript automatically invokes it when encountering an object where a primitive value is expected.

Examples

Using valueOf()

const sym = Symbol("example");
sym === sym.valueOf(); // true

Specifications

Specification
ECMAScript (ECMA-262)The definition of 'Symbol.prototype.valueOf' in that specification.

Browser compatibility

Update compatibility data on GitHub

	Desktop						Mobile						Server
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet	Node.js
`valueOf`	Chrome Full support 38	Edge Full support 12	Firefox Full support 36	IE No support No	Opera Full support 25	Safari Full support 9	WebView Android Full support 38	Chrome Android Full support 38	Firefox Android Full support 36	Opera Android Full support 25	Safari iOS Full support 9	Samsung Internet Android Full support 3.0	nodejs Full support 0.12

Legend

Full support: Full support
No support: No support