What happens if you call resolve twice on a promise in JavaScript?
The first resolve wins. The promise fulfills with the first value. The second resolve (and any subsequent resolve/reject) is ignored because the promise is already settled.
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More FAQs in Promise States: Pending, Fulfilled, Rejected in JavaScript
Pending (initial, waiting for the operation to complete), fulfilled (operation succeeded, resolve was called), and rejected (operation failed, reject was called). A promise transitions from pending to fulfilled or rejected once.
No. A promise can only transition once: from pending to fulfilled or from pending to rejected. Once settled, it cannot change state. Subsequent resolve/reject calls are ignored.
Use Promise.resolve(value) for an already-fulfilled promise. Use Promise.reject(reason) for an already-rejected promise. These are settled immediately. .then/.catch still run (as microtasks).
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