Updated answer: using async / await leads to cleaner code. Old code below. I’ve successfully solved this problem by combining the following elements: Mock out the promise and make it resolve immediately Make the test asynchronous by marking the test function async After simulating the click, wait until the next macrotask to give the promise … Read more
async/await is about asynchrony, whereas Parallel.ForEach is about parallelism. They’re related concepts, but not the same. Parallel.ForEach is used when you want to execute the same operation on all the items in a collection, in parallel, blocking the current thread until all operations have completed. async/await is used when the current operation can’t make any … Read more
The only time that you can wrap an async method in a synchronous one is when you don’t need to get a return value. For example if you want to disable the save button, save results to the server asynchronously and re-enable the save button when the job is done you can write it like … Read more
MSDN explains everything. I understand though that sometimes vanilla docs (particularly from MSDN) can be difficult to apply to your particular situation, so let’s go over your points. Question # 1: Is this assumption correct or the code below the await keyword is still executed? The code below the “await” keyword will only be executed … Read more
launch is used to fire and forget coroutine. It is like starting a new thread. If the code inside the launch terminates with exception, then it is treated like uncaught exception in a thread — usually printed to stderr in backend JVM applications and crashes Android applications. join is used to wait for completion of … Read more
From the RFC: The return type of an async function is a unique anonymous type generated by the compiler, similar to the type of a closure. You can think of this type as being like an enum, with one variant for every “yield point” of the function – the beginning of it, the await expressions, … Read more
Update: Starting with Node 0.6 this post is obsolete, since stdout is synchronous now. Well let’s see what console.log actually does. First of all it’s part of the console module: exports.log = function() { process.stdout.write(format.apply(this, arguments) + ‘\n’); }; So it simply does some formatting and writes to process.stdout, nothing asynchronous so far. process.stdout is … Read more
Using async/await Since Rust 1.39, you can use async and await syntax to cover most cases: async fn a() -> usize { 2 } async fn b() -> usize { 10 } async fn f() -> usize { if 1 > 0 { a().await } else { b().await + 2 } } See also: What … Read more
In many circumstances they are different names for the same thing, but in some contexts they are quite different. So it depends. Terminology is not applied in a totally consistent way across the whole software industry. For example in the classic sockets API, a non-blocking socket is one that simply returns immediately with a special … Read more
You are conflating a few concepts. Concurrency is not parallelism, and async and await are tools for concurrency, which may sometimes mean they are also tools for parallelism. Additionally, whether a future is immediately polled or not is orthogonal to the syntax chosen. async / await The keywords async and await exist to make creating … Read more