ArrayBuffer.@@species

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

Syntax

ArrayBuffer[Symbol.species]

Description

The species accessor property returns the default constructor for ArrayBuffer objects. Subclass constructors may over-ride it to change the constructor assignment.

Examples

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

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

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

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

Specifications

Specification	Status	Comment
ECMAScript 2015 (6th Edition, ECMA-262) The definition of 'get ArrayBuffer [ @@species ]' in that specification.	Standard	Initial definition.
ECMAScript 2017 Draft (ECMA-262) The definition of 'get ArrayBuffer [ @@species ]' in that specification.	Draft

Browser compatibility

See also

• ArrayBuffer
• Symbol.species