Asynchronous JavaScript with async/await
In this course we will learn how to use the ES2017 async and await keywords to write asynchronous code that is more readable and easier to follow than equivalent code based on long promise chains or deeply nested callbacks. The await operator takes a promise and then pauses the function execution until that promise is settled which allows for an async function to read like sequential synchronous c
The Promise of a Burger Party - Mariko Kosaka
Two weeks ago, I was in a conversation about how I might implement a feature in JavaScript. It needed to be asynchronous to access external data, I said "well, let's use fetch()...so in code... umm..." while I paused to remember fetch API, the person I was talking to said, "It returns a promise". My brain froze, and I said: "I honestly don't know what you mean..." I've written promise based code p
Side Effects in JS Promise chains
Here I’m presenting two cool little functions that are making my days spent in the JS Promise land just a bit happier. All code snippets are written using ECMAScript 2015. So, I’ve often found myself writing code like this: const getUser = (id) => { return httpClient.get('https://facebook.com/user/' + id) .then((response) => { // Side Effects Logic return cacheData(response); }) .then((response) =
Promise の all と race だけで書ける待ち合わせ、書けない待ち合わせ - Qiita
ECMAScript 2015 で導入された Promise の関数 all と race だけで表現できる非同期処理の待ち合わせについての考察です。 考察の対象とした待ち合わせの条件は、「過半数の Promise が解決されるまで待つ」をはじめとした特殊なものです。**結論からいうと、all と race だけを組み合わせて、多数決による待ち合わせを表現可能です。**ただし、与えられた Promise の解決順序に依存する待ち合わせは、all と race だけでは書けません（ただし証明はできてないです 追記2020/11/08 書けるようです（否定的に証明されました）。 制約条件 Promise#then を使えば、なんでもできてしまいます。 そのため、この後の議論では Promise#then は封印します。 待ち合わせの書き方 まず、待ち合わせの表現方法を導入します。 非同期に解決
GitHub - sindresorhus/promise-fun: Promise packages, patterns, chat, and tutorials
Not accepting additions, but happy to take requests. pify: Promisify a callback-style function delay: Delay a promise a specified amount of time yoctodelay: Delay a promise a specified amount of time p-map: Map over promises concurrently p-all: Run promise-returning & async functions concurrently with optional limited concurrency p-event: Promisify an event by waiting for it to be emitted p-deboun
Untangling Deeply-Nested Promise Chains — Philip Walton
If you’ve been writing JavaScript for a while, you’ve probably heard terms like callback hell or the pyramid of doom. When promises were added to JavaScript a few years ago, I remember reading a lot of blog posts claiming that these problems would be solved; unfortunately, that was a little too optimistic. With more and more web APIs becoming promise-based, we’ve proven that even promises don’t pr
What is Promise.try, and why does it matter? - joepie91's Ramblings
A topic that frequently confuses users in the #Node.js channel, is the Promise.try method provided by Bluebird. People often struggle to understand what it is, or why they should use it - and this isn't helped by the fact that almost all guides to Promises fail to demonstrate its use. In this brief article, I hope to provide a better explanation of what Promise.try is, and why you should always us
How to stub promises using Sinon.JS
Promises are a great way of doing async programming. But testing with promises can be a bit cumbersome, even with the use of the arrow functions syntax. Recently I've found a small and nice package to help to stub tests using Sinon, and the library is sinon-stub-promise. function fetchMovieData() { return fetch("/movies") .then(res => { return res.json(); }) .then(movies => { return movies; }); }
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GitHub - sindresorhus/p-event: Promisify an event by waiting for it to be emitted
GitHub - nettofarah/json-crate: 📦 json-crate: a minimalistic promise-based json database
GitHub - microsoft/SyncTasks: An explicitly non-A+ Promise library that resolves promises synchronously
Release v3.5.0 · petkaantonov/bluebird
GitHub - kirillrogovoy/promised-pipe: A ramda.pipe-like utility that handles promises internally with zero dependencies
GitHub - ide/mux: Creates a promise that waits for the promises in nested data structures and resolves to data structures of the same form. It recursively traverses the input data structure and multiplexes its promises.
GitHub - trungfinity/then-sleep-js: Sleep, asynchronously.
GitHub - bredele/bluff: 🙏 Promise A+ implementation
GitHub - DJWassink/Promise-parallel-throttle: It's kinda like Promise.all(), but throttled!
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GitHub - jgornick/asyncp: Port of the async library to use Promises.
GitHub - GianlucaGuarini/allora: Promisify using es6 Proxies every javascript API with less than 50 lines of code
