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