2 // https://github.com/tc39/proposal-iterator-helpers
3 var $ = require('../internals/export');
4 var anObject = require('../internals/an-object');
5 var toPositiveInteger = require('../internals/to-positive-integer');
6 var createIteratorProxy = require('../internals/iterator-create-proxy');
7 var iteratorClose = require('../internals/iterator-close');
9 var IteratorProxy = createIteratorProxy(function (arg) {
10 var iterator = this.iterator;
11 if (!this.remaining--) {
13 return iteratorClose(iterator);
15 var result = anObject(this.next.call(iterator, arg));
16 var done = this.done = !!result.done;
17 if (!done) return result.value;
20 $({ target: 'Iterator', proto: true, real: true }, {
21 take: function take(limit) {
22 return new IteratorProxy({
23 iterator: anObject(this),
24 remaining: toPositiveInteger(limit)