You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
16 lines
606 B
16 lines
606 B
4 weeks ago
|
'use strict';
|
||
|
|
var anObject = require('../internals/an-object');
|
||
|
|
var aConstructor = require('../internals/a-constructor');
|
||
|
|
var isNullOrUndefined = require('../internals/is-null-or-undefined');
|
||
|
|
var wellKnownSymbol = require('../internals/well-known-symbol');
|
||
|
|
|
||
|
|
var SPECIES = wellKnownSymbol('species');
|
||
|
|
|
||
|
|
// `SpeciesConstructor` abstract operation
|
||
|
|
// https://tc39.es/ecma262/#sec-speciesconstructor
|
||
|
|
module.exports = function (O, defaultConstructor) {
|
||
|
|
var C = anObject(O).constructor;
|
||
|
|
var S;
|
||
|
|
return C === undefined || isNullOrUndefined(S = anObject(C)[SPECIES]) ? defaultConstructor : aConstructor(S);
|
||
|
|
};
|