make it as a singleton pattern

zloirock · Dec 14, 2019 · e0ee57d · e0ee57d
1 parent cce6aa5
commit e0ee57d
Showing 1 changed file with 6 additions and 6 deletions.
diff --git a/packages/core-js/internals/object-create.js b/packages/core-js/internals/object-create.js
@@ -13,11 +13,11 @@ var EmptyConstructor = function () { /* empty */ };
 var NullProtoObject = function (ProtoObject) {
   var length = enumBugKeys.length;
   while (length--) delete ProtoObject[PROTOTYPE][enumBugKeys[length]];
-  return ProtoObject();
+  return ProtoObject;
 };
 
 // Create object with fake `null` prototype: use ActiveX Object with cleared prototype
-var NullProtoObjectViaActiveX = function () {
+var NullProtoObjectViaActiveX = (function () {
   // Check for document.domain and active x support
   // No need to use active x approach when document.domain is not set
   // see https://github.com/es-shims/es5-shim/issues/150
@@ -33,10 +33,10 @@ var NullProtoObjectViaActiveX = function () {
   var ProtoObject = activeXDocument.parentWindow.Object;
   activeXDocument = null;
   return NullProtoObject(ProtoObject)
-};
+})();
 
 // Create object with fake `null` prototype: use iframe Object with cleared prototype
-var NullProtoObjectViaIFrame = function () {
+var NullProtoObjectViaIFrame = (function () {
   // Thrash, waste and sodomy: IE GC bug
   var iframe = documentCreateElement('iframe');
   var GT = '>';
@@ -53,7 +53,7 @@ var NullProtoObjectViaIFrame = function () {
   iframeDocument.write(LT + SCRIPT + GT + 'document.F=Object' + LT + '/' + SCRIPT + GT);
   iframeDocument.close();
   return NullProtoObject(iframeDocument.F);
-};
+})();
 
 hiddenKeys[IE_PROTO] = true;
 
@@ -67,6 +67,6 @@ module.exports = Object.create || function create(O, Properties) {
     EmptyConstructor[PROTOTYPE] = null;
     // add "__proto__" for Object.getPrototypeOf polyfill
     result[IE_PROTO] = O;
-  } else result = NullProtoObjectViaActiveX() || NullProtoObjectViaIFrame();
+  } else result = NullProtoObjectViaActiveX ? NullProtoObjectViaActiveX() : NullProtoObjectViaIFrame();
   return Properties === undefined ? result : defineProperties(result, Properties);
 };