Checkpoint 2 ‘The Async library in scala’ -> (Finally…) Blog Link – The Async library in Scala. The above blog explains how the ‘async’ and ‘await’ method of the Async object are used and internally implemented. Using example, use case of async and await is explained and limitations where they cant be used are demonstrated.

Scala官方还提供了一个Async库，用来简化Scala异步操作，尽管这个库还没有正式加入到Scala的标准库中。它是通过Scala macro特性实现的。 async用来标记一块异步执行的代码，通常这块代码中包含包含一个或者多个await调用。如果没有await调用，我们用future方法就可以了。

It gives you power new to make your code shorter and more understandable. Before async/await, callbacks and promises were used to handle asynchronous calls in JavaScript. Everyone who learns JavaScript has heard about the so-called callback hell. In Scala. In the experimental Scala-async extension to Scala, await is a "method", although it does not operate like an ordinary method. Furthermore, unlike in C# 5.0 in which a method must be marked as async, in Scala-async, a block of code is surrounded by an async "call".

Scala async await

By default, async blocks operate on scala.concurrent.{Future, Promise}. Update: as pointed out by Darren and Yann in comments, you can also do async/await in Scala thanks to this library. There is also a pending proposal to add it to the language that admits that it’s inspired by C#’s asyns/await syntax. Scala官方还提供了一个Async库，用来简化Scala异步操作，尽管这个库还没有正式加入到Scala的标准库中。它是通过Scala macro 特性实现的。 async 用来标记一块异步执行的代码，通常这块代码中包含包含一个或者多个 await 调用。 await () on already-completed future could return value synchronously. #73. This improves async/await to return synchronously if the future is already completed.

scala-async would remain as a simple macro that expands into the skeleton state machine class including adaptors for scala.concurrent.Future.

The scala-async library is powered by macros and will translate your code to something equivalent to flatMap and map calls. So in other words await does not block threads, even though it gives the illusion that it does. This looks great actually, unfortunately it has many limitations.

Native Promises in JavaScript have helped immensely, but the syntax is still a little callback-y. With Async + Await, we 2020-12-06 2019-08-29 Scala ; proposal to add async/await to C++ ; and many other less popular languages.

Flow Control in JavaScript is hard! Native Promises in JavaScript have helped immensely, but the syntax is still a little callback-y. With Async + Await, we

#73.

Since I didn’t think I was smart enought to work on the main libraries or compiler, I started to look for something that I could build and would benefit me and the community in general.
David p blom

the main thing to understand about async/await is that it's just another way of doing Future's flatMap. there's no concurrency magic behind the scenes.

async marks a block of asynchronous code. Such a block usually contains one or more await calls, which marks a point at which the computation will be suspended until the awaited Future is complete. By default, async blocks operate on scala.concurrent.{Future, Promise}. What is async?
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It was first added in C# and F# and then ported to other languages like Scala, Python, Javascript etc. scala async/await on android. GitHub Gist: instantly share code, notes, and snippets.