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The Array[@@species] accessor property returns the Array constructor.

Syntax

Array[Symbol.species]

Return value

The Array constructor.

Description

The species accessor property returns the default constructor for Array objects. Subclass constructors may override it to change the constructor assignment.

Examples

The species property returns the default constructor function, which is the Array constructor for Array objects:

Array[Symbol.species]; // function Array()

In a derived collection object (e.g. your custom array MyArray), the MyArray species is the MyArray constructor. However, you might want to overwrite this, in order to return parent Array objects in your derived class methods:

class MyArray extends Array {
  // Overwrite MyArray species to the parent Array constructor
  static get [Symbol.species]() { return Array; }
}

Specifications

Specification Status Comment
ECMAScript 2015 (6th Edition, ECMA-262)
The definition of 'get Array [ @@species ]' in that specification.
Standard Initial definition.
ECMAScript Latest Draft (ECMA-262)
The definition of 'get Array [ @@species ]' in that specification.
Draft  

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support ? ?48 ? ? ?
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support ? ? ?48 ? ? ?

1. From version 6.0.0: this feature is behind the --harmony runtime flag.

See also

Autorzy i etykiety dokumentu

Autorzy tej strony: PointedEars, fscholz, eduardoboucas, arai
Ostatnia aktualizacja: PointedEars,