package.internals.array-species-constructor.js Maven / Gradle / Ivy
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'use strict';
var isArray = require('../internals/is-array');
var isConstructor = require('../internals/is-constructor');
var isObject = require('../internals/is-object');
var wellKnownSymbol = require('../internals/well-known-symbol');
var SPECIES = wellKnownSymbol('species');
var $Array = Array;
// a part of `ArraySpeciesCreate` abstract operation
// https://tc39.es/ecma262/#sec-arrayspeciescreate
module.exports = function (originalArray) {
var C;
if (isArray(originalArray)) {
C = originalArray.constructor;
// cross-realm fallback
if (isConstructor(C) && (C === $Array || isArray(C.prototype))) C = undefined;
else if (isObject(C)) {
C = C[SPECIES];
if (C === null) C = undefined;
}
} return C === undefined ? $Array : C;
};
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