Declare a field — practice exercise

What you'll be asked to do

1. 1.Declare a fieldexercise · easy · 10 min

   Give the class a count field starting at zero and increase it once.

   Passes when: #out should show 1.

2. 2.Give each instance its own arrayexercise · easy · 10 min · practice plan

   Push to one basket and report both lengths.

   Passes when: #out should show 1 and 0.

3. 3.Use a field in the constructorexercise · easy · 10 min · practice plan

   Build a message from a field and a parameter.

   Passes when: #out should show Hello Ada.

4. 4.Override a fieldexercise · easy · 10 min · practice plan

   Let the constructor replace the field default when a value is given.

   Passes when: #out should show 5.

5. 5.Use an arrow fieldexercise · medium · 10 min · practice plan

   Make greet an arrow field so it keeps this when detached.

   Passes when: #out should show Hello Ada.

6. 6.Fix the field name that does not matchbug fix · easy · 8 min

   The method increases a name that was never declared as a field.

   Passes when: #out should show 1.

7. 7.Fix the shared arraybug fix · easy · 8 min · practice plan

   A static field is shared, so both baskets see the same items.

   Passes when: #out should show 1 and 0.

8. 8.Fix the missing field declarationbug fix · easy · 8 min · practice plan

   The class declares no field, so the property does not exist.

   Passes when: #out should show ready to go.

9. 9.Fix the normal method losing thisbug fix · easy · 8 min · practice plan

   A detached method needs an arrow field to keep its instance.

   Passes when: #out should show Hello Ada.

10. 10.Fix the default wiped by the constructorbug fix · easy · 8 min · practice plan

    The constructor assigns even when no value was passed, losing the field's default.

    Passes when: #out should show 1.

Between them these tasks cover Class fields, Defaults and Arrow fields.

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