--- /dev/null
+'use strict';
+// https://github.com/tc39/proposal-iterator-helpers
+var $ = require('../internals/export');
+var anObject = require('../internals/an-object');
+var createIteratorProxy = require('../internals/iterator-create-proxy');
+
+var IteratorProxy = createIteratorProxy(function (arg) {
+ var result = anObject(this.next.call(this.iterator, arg));
+ var done = this.done = !!result.done;
+ if (!done) return [this.index++, result.value];
+});
+
+$({ target: 'Iterator', proto: true, real: true }, {
+ asIndexedPairs: function asIndexedPairs() {
+ return new IteratorProxy({
+ iterator: anObject(this),
+ index: 0
+ });
+ }
+});