CODEWITHSUNDEEP
asynchronousrustasync-await
FuzzyBall
FuzzyBall

Reputation: 87

Await one of two futures in tokio

I have two futures that I can await. However, I only want to wait for the first of the two to finish, and do other things as soon as that happens. Is there a way?

Thanks in advance!

Upvotes: 0

Views: 333

Answers (2)

WhyNotHugo
WhyNotHugo

Reputation: 9924

futures_util::future::select does exactly what you're looking for. Example:

match future::select(future1, future2).await {
    Either::Left((value1, future2)) => todo!("do something with value1"),
    Either::Right((value2, future1)) => todo!("do something with value2"),
};

tokio::select is also relevant, but has some additional complexity.

Upvotes: 1

Dev
Dev

Reputation: 1808

Try this method,

 function asyncTask1() {
        return new <MethodName>(resolve => {
            
            setTimeout(() => {
                console.log("Async Task 1 completed");
                resolve("Result, Async Task 1");
            }, <mention time>); 
        });
    }

This method help to wait the task to complete one by one.

    <MethodName>.race([asyncTask1(), asyncTask2(),asyncTask3(),...])
        .then(result => {
            console.log("First task completed", result);
            
        })
        .catch(error => {
            console.error("An error occurred:", error);
        });

Upvotes: -1

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