Promise.all polyfill
Promise.all polyfill
20 min·senior·promises · async
Problem
Implement promiseAll(iterable) matching the spec essentials of Promise.all:
- Resolves to an array of resolved values, in input order
- Rejects on first rejection
- Accepts non-promise values (treated as already-resolved)
- Empty iterable resolves immediately to
[]
expected time · O(n)
expected space · O(n)
4 lines
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