Practice · 2 of 3

First Working Mirror

Write async function fastestMirror(urls, fetchFn) that starts ALL fetchFn(url) calls concurrently and resolves with the first value that FULFILLS — a rejected attempt must not win the race. If every mirror rejects, rethrow the last rejection.

Difficulty: intermediate

Press Submit to check your solution.

Back to lesson: Practice: Promise Combinators — Practice