| 1 | var anObject = require('../internals/an-object');
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| 2 | var aFunction = require('../internals/a-function');
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| 3 | var wellKnownSymbol = require('../internals/well-known-symbol');
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| 4 |
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| 5 | var SPECIES = wellKnownSymbol('species');
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| 6 |
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| 7 | // `SpeciesConstructor` abstract operation
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| 8 | // https://tc39.github.io/ecma262/#sec-speciesconstructor
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| 9 | module.exports = function (O, defaultConstructor) {
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| 10 | var C = anObject(O).constructor;
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| 11 | var S;
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| 12 | return C === undefined || (S = anObject(C)[SPECIES]) == undefined ? defaultConstructor : aFunction(S);
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| 13 | };
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