Read with Reflect.get — practice exercise

What you'll be asked to do

1. 1.Read with Reflect.getexercise · easy · 10 min

   Read a property using Reflect instead of dot notation.

   Passes when: #out should show Ada.

2. 2.Check with Reflect.hasexercise · easy · 10 min · practice plan

   Check a property exists using Reflect.

   Passes when: #out should show true.

3. 3.Forward a read inside a Proxyexercise · easy · 10 min · practice plan

   Use Reflect.get inside a get trap.

   Passes when: #out should show Ada.

4. 4.Check whether a write succeededexercise · easy · 10 min · practice plan

   Report whether writing to a frozen object worked.

   Passes when: #out should show false.

5. 5.List own keysexercise · medium · 10 min · practice plan

   List an object's own property names with Reflect.

   Passes when: #out should show name,age.

6. 6.Fix Reflect.get given the arguments in the wrong orderbug fix · easy · 8 min

   The target comes first and the key second.

   Passes when: #out should show Ada.

7. 7.Fix the trap that does not forward to Reflectbug fix · easy · 8 min · practice plan

   Returning a hardcoded value ignores whatever the target actually holds.

   Passes when: #out should show Grace.

8. 8.Fix Reflect.set checked with the wrong resultbug fix · easy · 8 min · practice plan

   A successful write returns true, a refused one returns false.

   Passes when: #out should show refused.

9. 9.Fix Object.keys used where symbols matterbug fix · easy · 8 min · practice plan

   Reflect.ownKeys includes symbol keys that Object.keys skips.

   Passes when: #out should show 1 own key.

10. 10.Fix deleteProperty never calledbug fix · easy · 8 min · practice plan

    The property is still there because nothing actually removed it.

    Passes when: #out should show true.

Between them these tasks cover Reflect.get/set, Reflect.has and Forwarding in a Proxy.

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