Set[@@species] 访问器属性返回Set的构造函数.

语法

Set[Symbol.species]

描述

species 访问属性返回 Set 对象的默认构造函数. 子构造函数或许会重载这个属性以至改变构造函数的赋值.

示例

species 属性返回默认的构造函数, 它是Set 对象的构造函数:

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

在一个派生集合对象中 (比如你自定义的MySet集合),  MySet 的species 属性 是 MySet 构造函数. 又或者, 你想要重写它, 让它能在你派生的类方法中能返回父级Set 对象:

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

规范

Specification Status Comment
ECMAScript 2015 (6th Edition, ECMA-262)
get Set [ @@species ]
Standard Initial definition.
ECMAScript Latest Draft (ECMA-262)
get Set [ @@species ]
Draft  

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