| 'use strict'; |
| // https://github.com/tc39/proposal-iterator-helpers |
| var $ = require('../internals/export'); |
| var anObject = require('../internals/an-object'); |
| var createAsyncIteratorProxy = require('../internals/create-async-iterator-proxy'); |
| |
| var AsyncIteratorProxy = createAsyncIteratorProxy(function (arg, Promise) { |
| var state = this; |
| var iterator = state.iterator; |
| |
| return Promise.resolve(anObject(state.next.call(iterator, arg))).then(function (step) { |
| if (anObject(step).done) { |
| state.done = true; |
| return { done: true, value: undefined }; |
| } |
| return { done: false, value: [state.index++, step.value] }; |
| }); |
| }); |
| |
| $({ target: 'AsyncIterator', proto: true, real: true }, { |
| asIndexedPairs: function asIndexedPairs() { |
| return new AsyncIteratorProxy({ |
| iterator: anObject(this), |
| index: 0 |
| }); |
| } |
| }); |