Symbol.prototype

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

Description

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

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

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 AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung InternetNode.js
prototypeChrome Full support 38Edge Full support 12Firefox Full support 36IE No support NoOpera Full support 25Safari Full support 9WebView Android Full support 38Chrome Android Full support 38Firefox Android Full support 36Opera Android Full support 25Safari iOS Full support 9Samsung Internet Android Full support 3.0nodejs Full support Yes

Legend

Full support  
Full support
No support  
No support
Related Topics
  1. Standard built-in objects
  2. Symbol
  3. Properties
    1. Symbol.asyncIterator
    2. Symbol.hasInstance
    3. Symbol.isConcatSpreadable
    4. Symbol.iterator
    5. Symbol.match
    6. Symbol.matchAll
    7. Symbol.prototype
    8. Symbol.prototype.description
    9. Symbol.replace
    10. Symbol.search
    11. Symbol.species
    12. Symbol.split
    13. Symbol.toPrimitive
    14. Symbol.toStringTag
    15. Symbol.unscopables
  4. Methods
    1. Symbol.for()
    2. Symbol.keyFor()
    3. Symbol.prototype.toSource()
    4. Symbol.prototype.toString()
    5. Symbol.prototype.valueOf()
    6. Symbol.prototype[@@toPrimitive]
  5. Inheritance:
  6. Function
  7. Properties
    1. Function.arguments
    2. Function.arity
    3. Function.caller
    4. Function.displayName
    5. Function.length
    6. Function.name
    7. Function.prototype
  8. Methods
    1. Function.prototype.apply()
    2. Function.prototype.bind()
    3. Function.prototype.call()
    4. Function.prototype.isGenerator()
    5. Function.prototype.toSource()
    6. Function.prototype.toString()
  9. Object
  10. Properties
    1. Object.prototype.__count__
    2. Object.prototype.__noSuchMethod__
    3. Object.prototype.__parent__
    4. Object.prototype.__proto__
    5. Object.prototype.constructor
  11. Methods
    1. Object.prototype.__defineGetter__()
    2. Object.prototype.__defineSetter__()
    3. Object.prototype.__lookupGetter__()
    4. Object.prototype.__lookupSetter__()
    5. Object.prototype.hasOwnProperty()
    6. Object.prototype.isPrototypeOf()
    7. Object.prototype.propertyIsEnumerable()
    8. Object.prototype.toLocaleString()
    9. Object.prototype.toSource()
    10. Object.prototype.toString()
    11. Object.prototype.unwatch()
    12. Object.prototype.valueOf()
    13. Object.prototype.watch()
    14. Object.setPrototypeOf()