-var has = require('../internals/has');
+var global = require('../internals/global');
+var hasOwn = require('../internals/has-own-property');
+var isCallable = require('../internals/is-callable');
var toObject = require('../internals/to-object');
var sharedKey = require('../internals/shared-key');
var CORRECT_PROTOTYPE_GETTER = require('../internals/correct-prototype-getter');
var IE_PROTO = sharedKey('IE_PROTO');
+var Object = global.Object;
var ObjectPrototype = Object.prototype;
// `Object.getPrototypeOf` method
// https://tc39.es/ecma262/#sec-object.getprototypeof
module.exports = CORRECT_PROTOTYPE_GETTER ? Object.getPrototypeOf : function (O) {
- O = toObject(O);
- if (has(O, IE_PROTO)) return O[IE_PROTO];
- if (typeof O.constructor == 'function' && O instanceof O.constructor) {
- return O.constructor.prototype;
- } return O instanceof Object ? ObjectPrototype : null;
+ var object = toObject(O);
+ if (hasOwn(object, IE_PROTO)) return object[IE_PROTO];
+ var constructor = object.constructor;
+ if (isCallable(constructor) && object instanceof constructor) {
+ return constructor.prototype;
+ } return object instanceof Object ? ObjectPrototype : null;
};