get ArrayBuffer[@@species] - JavaScript 编辑

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

Description

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

Examples

Species in ordinary objects

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

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

Species in derived objects

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

Browser compatibility

BCD tables only load in the browser

See also

• ArrayBuffer
• Symbol.species