get Array[@@species] - JavaScript 编辑

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

Species in ordinary objects

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

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

Species in derived objects

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

Browser compatibility

BCD tables only load in the browser

See also

• Array
• Symbol.species