promise.race( )

Promise.race is a timeout primitive: the first settlement wins — success or failure. Naive move Only listen for fulfills, or wait for all and pick min latency. Both miss the point. Where it breaks A fast rejection must reject the race. Non-promises must compete too (they settle as already-resolved). Empty arrays hang forever in the real API — call that out. The fix For each input, Promise.resolve(input).then(resolve, reject) onto one outer promise. The first call to resolve/reject wins; later settlements no-op. Remember: Race = first settlement, not first success. Say this in the interview: I'd wire every input into one outer promise so the first fulfill or reject settles it, and I'd mention empty-array hang as a known footgun.