What is Promise.race in TypeScript?

Can you explain what Promise.race does in TypeScript?

Sure! Promise.race is a method that 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.

How does it differ from Promise.all?

The main difference is that Promise.all waits for all promises to resolve or for any to reject, while Promise.race resolves as soon as the first promise settles.

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

Of course! Here's a simple example:

const promise1 = new Promise((resolve) => setTimeout(resolve, 100, 'First!'));
const promise2 = new Promise((resolve) => setTimeout(resolve, 200, 'Second!'));

Promise.race([promise1, promise2]).then((value) => {
  console.log(value); // Outputs: 'First!'
});

What happens if all promises reject?

If all promises reject, the returned promise from Promise.race will also reject with the reason of the first promise that rejected.