Set two properties — practice exercise

What you'll be asked to do

1. 1.Set two propertiesexercise · easy · 10 min

   Store a name and an age, then report them together.

   Passes when: #out should show Ada is 36.

2. 2.Give a default valueexercise · easy · 10 min · practice plan

   Default the name to unknown when none is passed.

   Passes when: #out should show unknown.

3. 3.Work out a derived valueexercise · easy · 10 min · practice plan

   Store the area worked out from the width and height.

   Passes when: #out should show 20.

4. 4.Reject a bad valueexercise · easy · 10 min · practice plan

   Throw when the balance is negative and report the message.

   Passes when: #out should show balance cannot be negative.

5. 5.Use a class with no constructorexercise · medium · 10 min · practice plan

   Create an instance of an empty class and report its type.

   Passes when: #out should show object.

6. 6.Fix the misspelled constructorbug fix · easy · 8 min

   The setup method must be named constructor exactly.

   Passes when: #out should show Ada.

7. 7.Fix the default that never appliesbug fix · easy · 8 min · practice plan

   The default belongs on the parameter, not inside a condition on the wrong value.

   Passes when: #out should show unknown.

8. 8.Fix the parameters in the wrong orderbug fix · easy · 8 min · practice plan

   The arguments are being stored the wrong way round.

   Passes when: #out should show Ada is 36.

9. 9.Fix the validation that never firesbug fix · easy · 8 min · practice plan

   The condition checks the wrong way, so the bad value is accepted.

   Passes when: #out should show balance cannot be negative.

10. 10.Fix the derived value never storedbug fix · easy · 8 min · practice plan

    The area is worked out but not kept on the instance.

    Passes when: #out should show 20.

Between them these tasks cover constructor, Default parameters and Validation.

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