Question 1

What is Promise.any and when do you use it in JavaScript?

Accepted Answer

Promise.any returns the first promise to fulfill. If all promises reject, it rejects with an AggregateError containing all rejection reasons. Use it when you want the first successful result from multiple sources (e.g., multiple API endpoints).

Question 2

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

Accepted Answer

Promise.all waits for all and rejects if any rejects (fast fail). allSettled waits for all and never rejects (returns status objects). race returns the first to settle (fulfilled or rejected). any returns the first to fulfill (rejects with AggregateError if all reject).

Question 3

When should you use Promise.allSettled instead of Promise.all in JavaScript?

Accepted Answer

When you want all results even if some promises reject (partial success). Promise.all rejects if any promise rejects. allSettled waits for all and returns an array of { status, value/reason } objects, so you can handle each result individually.

Question 4

What is Promise.race used for in JavaScript?

Accepted Answer

When you want the first promise to settle (fulfilled or rejected). Common use: implementing a timeout. Race the operation against a timeout promise; whichever settles first wins.

What is Promise.any and when do you use it in JavaScript?

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