当关键字字面上是异步时，为什么我们必须使用关键字 async 和 await 使其在节点中同步？

Question

So I was thinking that ok node is asynchronous (meaning multiple lines of code execute at the same time), then why we use the keyword async( which literally means asynchronous) to wait for a task to be done by keyword await (that is making it synchronous). Why there is not a keyword sync , because that's what we are doing? Can someone please explain the logic of keyword async? I am so confused.

Answer 1

The async keyword enables the use of await which is just a more streamlined syntax for writing code with promises and asynchronous operations. It does not make anything synchronous. It just allows you to use similar programming techniques as synchronous code, but it is all still asynchronous.

Can someone please explain the logic of keyword async? I am so confused.

When you use the async keyword to declare a function, you are creating a different type of function that ALWAYS returns a promise. This is useful only for asynchronous programming - thus the async keywords's affiliation with the term "asynchronous".

Further, the async keyword does not make anything synchronous. It does allow you to use a more synchronous-like programming model which is a lot simpler to use, particular for things like conditional branches in asynchronous code, but nothing that was asynchronous actually becomes synchronous.

Answer 2

Node.js is not "asynchronous," but instead, Node.js has a set of asynchronous APIs.

To answer your question about async/await - async/await is just syntactic sugar as it uses promises under the hood.