2 // https://github.com/tc39/proposal-iterator-helpers
3 var $ = require('../internals/export');
4 var apply = require('../internals/function-apply');
5 var anObject = require('../internals/an-object');
6 var toPositiveInteger = require('../internals/to-positive-integer');
7 var createIteratorProxy = require('../internals/iterator-create-proxy');
8 var iteratorClose = require('../internals/iterator-close');
10 var IteratorProxy = createIteratorProxy(function (args) {
11 var iterator = this.iterator;
12 if (!this.remaining--) {
14 return iteratorClose(iterator, 'normal', undefined);
16 var result = anObject(apply(this.next, iterator, args));
17 var done = this.done = !!result.done;
18 if (!done) return result.value;
21 $({ target: 'Iterator', proto: true, real: true }, {
22 take: function take(limit) {
23 return new IteratorProxy({
24 iterator: anObject(this),
25 remaining: toPositiveInteger(limit)