Down-side on calling async function without await

问题

Given the code with async

async function wierdFunction(){
    setTimeout(function(){
        //background process that does not return
        //Russian roulette
        if ( Math.random() > 0.99 )
            throw new Error('Bang!');
    }, 3000);
}

I only need to call this function asynchronous, I don't need to know when it finished.

app.post('/wierd-endpoint', function (req,res){
    wierdFunction();
    res.json({status:"Running. Now, go away."});
});

Is there any advise against calling it without await keyword?

回答1:

Just remove the async from wierdFunction(). If you're not using the returned promise and not using await inside, then there's no reason to have it. It just creates an extra promise object for the return that then gets garbage collected so it creates extra overhead and it implies to the caller that the caller can use that promise for something useful.

Is there any advise against calling it without await keyword?

If your operation is truly "fire and forget" and you don't care about completion or reported errors, then it does not need to return a promise and you can just make it a normal function that initiates an asynchronous operation, but doesn't report any results.

来源：https://stackoverflow.com/questions/49657914/down-side-on-calling-async-function-without-await