How to use async functions within functions?

Question

So lets say you have this sync function you call a and another async function b that you want to put within a. And so you would have something like this:

async function b(){
      //some code here
}
function a(){
    

}

And now lets say we add some code into a and call b:

async function b(){
      //some code here
}
function a(){
      b()
      //other code here
}

Now lets say you want to run the code within a only if b has returned its promise. Well if you have direct access to b then its all fine, just make it a sync function. That would work but what if you didn't have access to b. Here comes the problem. If you specifically want to run it after b then you could use something like .then():

async function b(){
     //some code here
}
function a(){
     b().then(<results for example>=>{
     //other code
     })
}

But what if a was an async function, how would that work? Could i use await or anything of that sort?

Pretty much the only reason to have async functions is to use await inside them. There is almost no benefit if you don't. — VLAZ
– VLAZ, Commented Apr 28, 2022 at 14:03
@VLAZ The other benefit is that exceptions and return values are converted into promises — Ruan Mendes
– Ruan Mendes, Commented Apr 28, 2022 at 14:04
@JuanMendes it's part of the "almost". It's a very small benefit. I'd say await is more than 90% of the reason to use async. — VLAZ
– VLAZ, Commented Apr 28, 2022 at 14:07
@DcraftBg — You should probably start out with the MDN documentation for language features you don't understand in order to get a basic understanding of them before resorting to SO. — Quentin
– Quentin, Commented Apr 28, 2022 at 14:08

Saied Islam Shuvo · Accepted Answer · 2022-04-28 14:08:19Z

3

You have to make a function async and await for b function, then b function will return data, otherwise it will return promise.

async function b(){
    //some code here
}
async function a(){
    const data = await b();
    // Do something with data
}

answered Apr 28, 2022 at 14:08

Saied Islam Shuvo

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