Converts an iterable, iterable of Promises, or async iterable into a Promise of an Array.

Related tags

Learning resource iterate-all
Overview

iterate-all

A utility function that converts any of these:

  • Iterable<T>
  • Iterable<Promise<T>>
  • AsyncIterable<T>
  • AsyncIterable<Promise<T>>

Into this:

  • Promise<Array<T>>

Usage

import {iterateAll} from "iterate-all";

async function* someAsyncGenerator() {
  yield 1;
  yield Promise.resolve(2);
  yield 3;
}

const results = await iterateAll(someAsyncGenerator());

console.log(results); // [1, 2, 3];

Notes

  • Each yielded value will be awaited before asking for the next value. As such, all execution will proceed serially; the same as if using for..of or for await..of.
  • The next function on the iterable will always be called with no arguments. As such, when using a generator function to create your iterable, the result of any yield expression inside the generator function will always be undefined.
  • If you find yourself wanting a synchronous version of this, Array.from (potentially combined with Promise.all) is probably sufficient for your needs.

License

MIT

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Comments
  • Little refactoring

    Little refactoring

    Thanks for this utility library, it's quite useful! Just opening this PR that adds I minimal change in the function code and syntax highlight to the README.md.

    opened by EvandroLG 1
Owner
Lily Scott
Former Prettier Core Team member, Former Babel team member. Interested in JavaScript, Rust, Unity, VR, Dev Tooling, Dev Experience, React, and more.
Lily Scott
GitHub
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