get Set[@@species]
The Set[Symbol.species]
accessor property returns the Set
constructor.
Description
The species
accessor property returns the default constructor for Set
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 Set
constructor for Set
objects:
Set[Symbol.species]; // function Set()
Species in derived objects
In a derived collection object (e.g. your custom set MySet
), the MySet
species is the MySet
constructor. However, you might want to overwrite this, in order to return parent Set
objects in your derived class methods:
class MySet extends Set {
// Overwrite MySet species to the parent Set constructor
static get [Symbol.species]() { return Set; }
}
Specifications
Specification |
---|
ECMAScript Language Specification # sec-get-set-@@species |
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