Consume an async generator — practice exercise

What you'll be asked to do

1. 1.Consume an async generatorexercise · easy · 10 min

   Use for await to collect values from an async generator.

   Passes when: #out should show 1,2,3.

2. 2.Transform each awaited valueexercise · easy · 10 min · practice plan

   Uppercase each item as it is awaited and yielded.

   Passes when: #out should show A,B.

3. 3.Catch an error mid-streamexercise · easy · 10 min · practice plan

   Catch a rejection that happens partway through an async generator.

   Passes when: #out should show 1,caught: stream failed.

4. 4.Mix plain and awaited yieldsexercise · easy · 10 min · practice plan

   Yield some values immediately and one through a promise.

   Passes when: #out should show 1,2,3.

5. 5.Use for await on a plain generatorexercise · medium · 10 min · practice plan

   Show that for await also works on a synchronous generator.

   Passes when: #out should show 1,2.

6. 6.Fix for of used on an async generatorbug fix · easy · 8 min

   An async generator needs for await, not a plain for of.

   Passes when: #out should show 1,2,3.

7. 7.Fix the missing async on the generatorbug fix · easy · 8 min · practice plan

   await is only a keyword inside an async function, so using it in a plain generator will not even parse.

   Passes when: #out should show 1,2,3.

8. 8.Fix the rejection never caughtbug fix · easy · 8 min · practice plan

   Without a try block, the loop's error escapes unhandled.

   Passes when: #out should show caught it.

9. 9.Fix for await used outside an async functionbug fix · easy · 8 min · practice plan

   for await can only be used inside an async function.

   Passes when: #out should show 1,2,3.

10. 10.Fix the values pushed before awaitingbug fix · easy · 8 min · practice plan

    The value should be pushed after it resolves, not the raw promise.

    Passes when: #out should show A,B.

Between them these tasks cover async function*, for await and Async generators.

Looking for a different chapter? See every practice set, or switch to the interview theory questions.