Clean up after a failure — practice exercise

What you'll be asked to do

1. 1.Clean up after a failureexercise · easy · 10 min

   Record the three steps in order.

   Passes when: #out should show trying caught cleaned up.

2. 2.Clean up after successexercise · easy · 10 min · practice plan

   Show that finally runs when nothing failed.

   Passes when: #out should show worked cleaned up.

3. 3.Clear a loading flagexercise · easy · 10 min · practice plan

   Turn the flag off whatever happens.

   Passes when: #out should show finished.

4. 4.Run before a returnexercise · easy · 10 min · practice plan

   Show that finally runs even when the try block returns.

   Passes when: #out should show finally still ran.

5. 5.Use finally without catchexercise · medium · 10 min · practice plan

   Clean up but let the error keep travelling.

   Passes when: #out should show cleaned and escaped.

6. 6.Fix the cleanup repeated in both branchesbug fix · easy · 8 min

   finally does the job once instead of twice.

   Passes when: #out should show 2 steps.

7. 7.Fix the cleanup skipped on failurebug fix · easy · 8 min · practice plan

   Cleanup placed in the try block is skipped when it throws.

   Passes when: #out should show finished.

8. 8.Fix the return from finallybug fix · easy · 8 min · practice plan

   A return in finally overrides the one in try.

   Passes when: #out should show from try.

9. 9.Fix the order recorded wronglybug fix · easy · 8 min · practice plan

   finally runs last, after the catch.

   Passes when: #out should show trying caught cleaned up.

10. 10.Fix the error swallowed by finallybug fix · easy · 8 min · practice plan

    The inner block should clean up but still let the error escape.

    Passes when: #out should show cleaned and escaped.

Between them these tasks cover finally, Cleanup and Control flow.

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