Promise.all在babel ES6实施中解决

问题描述

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我正在使用babel转换我的[email protected]代码，但我信守诺言.

I'm using babel to transpile my [email protected] code and I'm stuck with promises.

我需要例如可以在q和bluebird或angular.$q中使用的allSettled类型功能.

I need allSettled-type functionality that I could use in q and bluebird or angular.$q for example.

在babel的core-js Promise上，没有allSettled方法.

On babel's core-js Promise, there is no allSettled method.

当前，我正在使用q.allSettled作为解决方法:

Currently I'm using q.allSettled as a workaround:

import { allSettled } from 'q';

babel polyfill中有类似的东西吗?或者，这是我尝试实施的一种很好的算法?

Is there something like that in babel polyfill? Alternatively, which is a good algorithm for me to try to implement?

推荐答案

1. 使用执行程序功能创建新的承诺
2. 在执行程序的范围内使用计数器/结果数组
3. 向每个父对象注册一个then()回调，并将结果保存在数组中
4. 当计数器指示所有父项承诺均已完成时，从步骤1解析/拒绝承诺

1. create a new promise with an executor function
2. use a counter/result array in the scope of the executor
3. register a then() callback with each parent promise saving the results in the array
4. resolve/reject promise from step 1 when counter indicates that all parent promises are done

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