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 createAsyncIteratorProxy = require('../internals/async-iterator-create-proxy');
8 var AsyncIteratorProxy = createAsyncIteratorProxy(function (arg, Promise) {
9 var iterator = this.iterator;
10 var returnMethod, result;
11 if (!this.remaining--) {
12 result = { done: true, value: undefined };
14 returnMethod = iterator['return'];
15 if (returnMethod !== undefined) {
16 return Promise.resolve(returnMethod.call(iterator)).then(function () {
21 } return this.next.call(iterator, arg);
24 $({ target: 'AsyncIterator', proto: true, real: true }, {
25 take: function take(limit) {
26 return new AsyncIteratorProxy({
27 iterator: anObject(this),
28 remaining: toPositiveInteger(limit)