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- 'use strict';
- // https://github.com/tc39/proposal-iterator-helpers
- var $ = require('../internals/export');
- var apply = require('../internals/function-apply');
- var call = require('../internals/function-call');
- var anObject = require('../internals/an-object');
- var toPositiveInteger = require('../internals/to-positive-integer');
- var createAsyncIteratorProxy = require('../internals/async-iterator-create-proxy');
- var AsyncIteratorProxy = createAsyncIteratorProxy(function (Promise, args) {
- var iterator = this.iterator;
- var returnMethod, result;
- if (!this.remaining--) {
- result = { done: true, value: undefined };
- this.done = true;
- returnMethod = iterator['return'];
- if (returnMethod !== undefined) {
- return Promise.resolve(call(returnMethod, iterator)).then(function () {
- return result;
- });
- }
- return result;
- } return apply(this.next, iterator, args);
- });
- $({ target: 'AsyncIterator', proto: true, real: true, forced: true }, {
- take: function take(limit) {
- return new AsyncIteratorProxy({
- iterator: anObject(this),
- remaining: toPositiveInteger(limit)
- });
- }
- });
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