Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Welcome To Ask or Share your Answers For Others

Categories

0 votes
924 views
in Technique[技术] by (71.8m points)

asynchronous - While loops using Await Async.

This Javascript function seems to use the while loop in an asynchronous way. Is it the correct way to use while loops with asynchronous conditions?

 var Boo;
 var Foo = await getBar(i)
 while(Foo) {
    Boo = await getBar3(i)
    if (Boo) {
      // something
    }
    Foo = await getBar(i)
    i++
  }

What I think it does is this:

var Boo;
var Foo;
getBar(i).then( (a) => {
  Foo = a;
  if(Foo) {
    getBar3(i).then( (a) => {
      Boo = a
      if(Boo) {
        //something
        i++;
        getBar(i).then( (a} => { Repeat itself...}?
      }
   }
  }
})

If that's totally false could you show another way to do it with async await + while loop?

Thanks!!

See Question&Answers more detail:os

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome To Ask or Share your Answers For Others

1 Reply

0 votes
by (71.8m points)

Is it the correct way to use while loops with asynchronous conditions?

Yes. async functions simply suspend their execution on every await until the respective promises fulfills, and any control structures continue to work as before.


与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
OGeek|极客中国-欢迎来到极客的世界,一个免费开放的程序员编程交流平台!开放,进步,分享!让技术改变生活,让极客改变未来! Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Click Here to Ask a Question

...