var isObject = require('./_is-object');
var isArray = require('./_is-array');
var SPECIES = require('./_wks')('species');
module.exports = function (original) {
var C;
if (isArray(original)) {
C = original.constructor;
// cross-realm fallback
if (typeof C == 'function' && (C === Array || isArray(C.prototype))) C = undefined;
if (isObject(C)) {
C = C[SPECIES];
if (C === null) C = undefined;
}
} return C === undefined ? Array : C;
};