fix one case of built-in iterators deoptimization in V8, related #377

zloirock · Mar 27, 2018 · 795c6bd · 795c6bd
1 parent 22ebb62
commit 795c6bd
Showing 1 changed file with 1 addition and 2 deletions.
diff --git a/modules/_iter-define.js b/modules/_iter-define.js
@@ -3,7 +3,6 @@ var LIBRARY = require('./_library');
 var $export = require('./_export');
 var redefine = require('./_redefine');
 var hide = require('./_hide');
-var has = require('./_has');
 var Iterators = require('./_iterators');
 var $iterCreate = require('./_iter-create');
 var setToStringTag = require('./_set-to-string-tag');
@@ -41,7 +40,7 @@ module.exports = function (Base, NAME, Constructor, next, DEFAULT, IS_SET, FORCE
       // Set @@toStringTag to native iterators
       setToStringTag(IteratorPrototype, TAG, true);
       // fix for some old engines
-      if (!LIBRARY && !has(IteratorPrototype, ITERATOR)) hide(IteratorPrototype, ITERATOR, returnThis);
+      if (!LIBRARY && typeof IteratorPrototype[ITERATOR] != 'function') hide(IteratorPrototype, ITERATOR, returnThis);
     }
   }
   // fix Array#{values, @@iterator}.name in V8 / FF