Question 1

What is the difference between Promise.race and Promise.any in JavaScript?

Accepted Answer

Promise.race returns the first to settle (fulfilled or rejected). Promise.any returns the first to fulfill (ignores rejections until all reject). race can reject on the first rejection; any only rejects if all reject (with AggregateError).

Question 2

What does Promise.race do in JavaScript?

Accepted Answer

It returns as soon as the first promise settles (fulfilled or rejected). If the first to settle fulfills, the race fulfills with its value. If the first to settle rejects, the race rejects with its reason.

Question 3

How do you implement a timeout with Promise.race in JavaScript?

Accepted Answer

Race the operation against a timeout promise: Promise.race([fetch('/api'), new Promise((_, reject) => setTimeout(() => reject(new Error('timeout')), 5000))]). If the timeout fires first, the race rejects.

Question 4

Does Promise.race reject if the first promise to settle rejects in JavaScript?

Accepted Answer

Yes. If the first promise to settle rejects, the race rejects with that reason. This is different from Promise.any, which ignores rejections and waits for the first fulfillment.

What is the difference between Promise.race and Promise.any in JavaScript?

More FAQs in Promise.race: Examples and Use Cases in JavaScript

Still have questions?

Want to upskill yourself?

Small steps. Big possibilities.

Our courses are taking a Coffee break, but your curiosity shouldn't. Stay engaged with namastedev linkedin, youtube, discord and other resources while you wait.