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Last change
on this file was d24f17c, checked in by Aleksandar Panovski <apano77@…>, 15 months ago |
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Initial commit
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606 bytes
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| 1 | 'use strict';
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| 2 | var anObject = require('../internals/an-object');
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| 3 | var aConstructor = require('../internals/a-constructor');
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| 4 | var isNullOrUndefined = require('../internals/is-null-or-undefined');
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| 5 | var wellKnownSymbol = require('../internals/well-known-symbol');
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| 6 |
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| 7 | var SPECIES = wellKnownSymbol('species');
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| 8 |
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| 9 | // `SpeciesConstructor` abstract operation
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| 10 | // https://tc39.es/ecma262/#sec-speciesconstructor
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| 11 | module.exports = function (O, defaultConstructor) {
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| 12 | var C = anObject(O).constructor;
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| 13 | var S;
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| 14 | return C === undefined || isNullOrUndefined(S = anObject(C)[SPECIES]) ? defaultConstructor : aConstructor(S);
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| 15 | };
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