How does Promise.race work in JavaScript?

Can you explain how Promise.race works in JavaScript?

Sure! Promise.race takes an iterable of promises and returns a single promise that resolves or rejects as soon as one of the promises in the iterable resolves or rejects.

What happens if one of the promises rejects?

If one of the promises rejects, the returned promise from Promise.race will reject with the reason of the first promise that rejects.

Can you give me an example of using Promise.race?

Absolutely! Here's a simple example:

const promise1 = new Promise((resolve, reject) => setTimeout(resolve, 100, 'First!'));
const promise2 = new Promise((resolve, reject) => setTimeout(reject, 50, 'Second!'));

Promise.race([promise1, promise2])
  .then(result => console.log(result))
  .catch(error => console.log(error));

In this case, 'Second!' will be logged because it rejects first.

Is there a use case for Promise.race?

Yes! It's useful for scenarios like implementing timeouts or handling multiple asynchronous operations where you only care about the first result.