Contents
How do you sync async code?
Async functions, a feature in ES2017, make async code look sync by using promises (a particular form of async code) and the await keyword. Also notice in the code examples below the keyword async in front of the function keyword that signifies an async/await function.
How do you make a promise then synchronous?
If you’re not concerned with IE support, you could use async and await to execute the promise as though it were synchronous. The await syntax will pause execution of the function until the promise resolves, letting you write the code as if there wasn’t a promise. To catch an error, you wrap it in a try/catch block.
When to write new code in async but call synchronously?
If there’s no requirement for the code to be asynchronous, then don’t. If requirements change later and require the code to be refactored, then it’s not technical debt, it’s just adapting to changing requirements. OTOH, if you write it as async and incur overhead to call it synchronously, then that’s bad design.
How to write an async function in JavaScript?
An async function is a function that knows how to expect the possibility of the await keyword being used to invoke asynchronous code. Try typing the following lines into your browser’s JS console: function hello ( ) { return “Hello” } ; hello ( ) ;
How to wrap async function calls into a sync function in node?
From time to time I find the need to encapsulate an async function (often provided in a 3rd party library) into a sync function in order to avoid massive global re-factoring. Searching for a solution on this subject usually ended up with Node Fibers or npm packages derived from it. But Fibers just cannot solve the problem I am facing.
Can a SYNC block be used in an async function?
Note: It is also possible to use a sync finally block within an async function, in place of a .finally () async block, to show a final report on how the operation went — you can see this in action in our live example (see also the source code ). Async/await makes your code look synchronous, and in a way it makes it behave more synchronously.