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 compatibility

Update compatibility data on GitHub
DesktopMobileServer
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidiOS SafariSamsung InternetNode.js
Basic supportChrome Full support 38Edge Full support 12Firefox Full support 36IE No support NoOpera Full support 25Safari Full support 9WebView Android Full support YesChrome Android Full support 38Edge Mobile Full support YesFirefox Android Full support 36Opera Android Full support 25Safari iOS Full support 9Samsung Internet Android Full support Yesnodejs Full support Yes

Legend

Full support  
Full support
No support  
No support

Document Tags and Contributors

Contributors to this page: fscholz, wbamberg, jameshkramer, jonny5, ZeikJT, arai
Last updated by: fscholz,