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Symbol.prototype

The Symbol.prototype property represents the prototype for the Symbol constructor.

Property attributes of `Symbol.prototype`
Writable	no
Enumerable	no
Configurable	no

Description

Symbol instances inherit from Symbol.prototype. You can use the constructor's prototype object to add properties or methods to all Symbol instances.

Properties

Symbol.prototype.constructor: Returns the function that created an instance's prototype. This is the Symbol function by default.
Symbol.prototype.description: A read-only string containing the description of the symbol.

Methods

Symbol.prototype.toSource(): Returns a string containing the source of the Symbol object. Overrides the Object.prototype.toSource() method.
Symbol.prototype.toString(): Returns a string containing the description of the Symbol. Overrides the Object.prototype.toString() method.
Symbol.prototype.valueOf(): Returns the primitive value of the Symbol object. Overrides the Object.prototype.valueOf() method.
Symbol.prototype[@@toPrimitive]: Returns the primitive value of the Symbol object.

Specifications

Specification	Status	Comment
ECMAScript 2015 (6th Edition, ECMA-262) The definition of 'Symbol.prototype' in that specification.	Standard	Initial definition.
ECMAScript Latest Draft (ECMA-262) The definition of 'Symbol.prototype' in that specification.	Draft

Browser compatibilityUpdate compatibility data on GitHub

	Desktop
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari
Basic support	38	12	36	No	25	9

	Mobile
	Android webview	Chrome for Android	Edge Mobile	Firefox for Android	Opera for Android	iOS Safari	Samsung Internet
Basic support	Yes	38	Yes	36	25	9	Yes

	Server
	Node.js
Basic support	Yes

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https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol/prototype