Promises & then/catch

Promise.all([
  fetch('/api/users'),
  fetch('/api/posts'),
  fetch('/api/comments')
])

All other Promises continue normally
The entire operation rejects immediately
Promise.all() implements fail-fast behavior: 1) If any Promise rejects, the entire operation rejects immediately, 2) The rejection error becomes the rejection reason for the returned Promise, 3) Other Promises continue executing but their results are ignored, 4) Useful when all operations must succeed for the result to be valid, 5) Best for dependent operations where partial success is meaningless.
Only the successful results are returned
It retries the failed Promise