// 7.3.20 SpeciesConstructor(O, defaultConstructor) | |
var anObject = require('./_an-object') | |
, aFunction = require('./_a-function') | |
, SPECIES = require('./_wks')('species'); | |
module.exports = function(O, D){ | |
var C = anObject(O).constructor, S; | |
return C === undefined || (S = anObject(C)[SPECIES]) == undefined ? D : aFunction(S); | |
}; |