ES6: Add support for Map/Set forEach

src/array-iterator.js

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 13 matching lines @@
 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 'use strict';
 
 // This file relies on the fact that the following declaration has been made
 // in runtime.js:
 // var $Array = global.Array;
 
-var ARRAY_ITERATOR_KIND_KEYS = 1;
-var ARRAY_ITERATOR_KIND_VALUES = 2;
-var ARRAY_ITERATOR_KIND_ENTRIES = 3;
-// The spec draft also has "sparse" but it is never used.
-
 var arrayIteratorObjectSymbol = GLOBAL_PRIVATE("ArrayIterator#object");
 var arrayIteratorNextIndexSymbol = GLOBAL_PRIVATE("ArrayIterator#next");
 var arrayIterationKindSymbol = GLOBAL_PRIVATE("ArrayIterator#kind");
 
 function ArrayIterator() {}
 
 // 15.4.5.1 CreateArrayIterator Abstract Operation
 function CreateArrayIterator(array, kind) {
   var object = ToObject(array);
   var iterator = new ArrayIterator;
@@ skipping 23 matching lines @@
 
   // "sparse" is never used.
 
   if (index >= length) {
     SET_PRIVATE(iterator, arrayIteratorNextIndexSymbol, INFINITY);
     return CreateIteratorResultObject(UNDEFINED, true);
   }
 
   SET_PRIVATE(iterator, arrayIteratorNextIndexSymbol, index + 1);
 
-  if (itemKind == ARRAY_ITERATOR_KIND_VALUES)
+  if (itemKind == ITERATOR_KIND_VALUES)
     return CreateIteratorResultObject(array[index], false);
 
-  if (itemKind == ARRAY_ITERATOR_KIND_ENTRIES)
+  if (itemKind == ITERATOR_KIND_ENTRIES)
     return CreateIteratorResultObject([index, array[index]], false);
 
   return CreateIteratorResultObject(index, false);
 }
 
 function ArrayEntries() {
-  return CreateArrayIterator(this, ARRAY_ITERATOR_KIND_ENTRIES);
+  return CreateArrayIterator(this, ITERATOR_KIND_ENTRIES);
 }
 
 function ArrayValues() {
-  return CreateArrayIterator(this, ARRAY_ITERATOR_KIND_VALUES);
+  return CreateArrayIterator(this, ITERATOR_KIND_VALUES);
 }
 
 function ArrayKeys() {
-  return CreateArrayIterator(this, ARRAY_ITERATOR_KIND_KEYS);
+  return CreateArrayIterator(this, ITERATOR_KIND_KEYS);
 }
 
 function SetUpArrayIterator() {
   %CheckIsBootstrapping();
 
   %FunctionSetInstanceClassName(ArrayIterator, 'Array Iterator');
   %FunctionSetReadOnlyPrototype(ArrayIterator);
 
   InstallFunctions(ArrayIterator.prototype, DONT_ENUM, $Array(
     'next', ArrayIteratorNext
   ));
 }
 
 SetUpArrayIterator();
 
 function ExtendArrayPrototype() {
   %CheckIsBootstrapping();
 
   InstallFunctions($Array.prototype, DONT_ENUM, $Array(
     'entries', ArrayEntries,
     'values', ArrayValues,
     'keys', ArrayKeys
   ));
 }
 
 ExtendArrayPrototype();