Copy an object — practice exercise

What you'll be asked to do

1. 1.Copy an objectexercise · easy · 10 min

   Copy an object, change the copy, and show the original is untouched.

   Passes when: #out should show Ada.

2. 2.Merge two objectsexercise · easy · 10 min · practice plan

   Merge defaults with user settings so the user value wins.

   Passes when: #out should show dark medium.

3. 3.Update one propertyexercise · easy · 10 min · practice plan

   Build a new object with active set to true, leaving the original alone.

   Passes when: #out should show false then true.

4. 4.Collect the restexercise · easy · 10 min · practice plan

   Pull out the id and collect the remaining properties, then list their names.

   Passes when: #out should show name,city.

5. 5.Add a property while copyingexercise · medium · 10 min · practice plan

   Copy an object and add a year in the same expression.

   Passes when: #out should show Toyota 2021.

6. 6.Fix the shared objectbug fix · easy · 8 min

   Assigning does not copy, so both names point at the same object.

   Passes when: #out should show Ada.

7. 7.Fix the merge orderbug fix · easy · 8 min · practice plan

   The defaults are overwriting the user's choice.

   Passes when: #out should show dark.

8. 8.Fix the original being changedbug fix · easy · 8 min · practice plan

   The update should build a new object rather than editing the old one.

   Passes when: #out should show false then true.

9. 9.Fix the rest that took everythingbug fix · easy · 8 min · practice plan

   The id should be pulled out before the rest is collected.

   Passes when: #out should show 2 left.

10. 10.Fix the property added after the spreadbug fix · easy · 8 min · practice plan

    The added property is being overwritten by the spread that follows it.

    Passes when: #out should show Toyota 2021.

Between them these tasks cover Spread, Rest properties and Merging objects.

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