如何将异步迭代器转换为数组? [英] How can I convert an async iterator to an array?

问题描述

鉴于我有一个异步生成器:

Given I have an async generator:

async function* generateItems() {
    // ...
}

将所有结果迭代到数组中的最简单方法是什么?我尝试了以下方法:

What's the simplest way to iterate all the results into an array? I've tried the following:

// This does not work
const allItems = Array.from(generateItems());

// This works but is verbose
const allItems = [];
for await (const item of generateItems()) {
    allItems.push(item);
}

(我知道这在Production应用程序中可能是不好的做法，但对于原型制作很方便.)

(I know this is potentially bad practice in a Production app, but it's handy for prototyping.)

推荐答案

类似于

Looks like the async-iterator-to-array npm library does this:

安装

npm install --save async-iterator-to-array

用法

const toArray = require('async-iterator-to-array')

async function * iterator (values) {
  for (let i = 0; i < values.length; i++) {
    yield values[i]
  }
}

const arr = await toArray(iterator([0, 1, 2, 3, 4]))

console.info(arr) // 0, 1, 2, 3, 4

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