JavaScript Async Functions and Async Iteration Quiz

Review

1. What does an async function call return?

   Calling an async function creates a Promise for its eventual result.
2. What does await do when its operand rejects?

   A rejected awaited Promise is rethrown at the await point.
3. What does await suspend?

   await suspends the current async continuation without blocking unrelated work.
4. Which pattern starts independent operations so they can overlap?

   Create independent operations first, then await their combined outcome.
5. Why can try/catch handle an awaited rejection?

   await propagates rejection by throwing the rejection reason inside the async function.
6. What does async iterator next() return?

   The async iterator interface requires next() to return a Promise for an IteratorResult.
7. Which construct consumes async iterables?

   for await...of awaits each asynchronous iterator step.
8. What does calling an async generator function produce?

   Async generator objects implement the async iterator and async iterable protocols.
9. What does Array.fromAsync return?

   Array.fromAsync fulfills a Promise with the collected Array.
10. Does await automatically cancel underlying work?

    await observes a Promise outcome; it is not a universal cancellation mechanism.