Add a default — practice exercise

What you'll be asked to do

1. 1.Add a defaultexercise · easy · 10 min

   Give a greeting function a default name of friend and call it with no argument.

   Passes when: #out should show Hello friend.

2. 2.Override the defaultexercise · easy · 10 min · practice plan

   Call the same greeting function with the name Ada.

   Passes when: #out should show Hello Ada.

3. 3.A default quantityexercise · easy · 10 min · practice plan

   Give quantity a default of 1 and show the total for a price of 50.

   Passes when: #out should show 50.

4. 4.Build a default from another parameterexercise · easy · 10 min · practice plan

   Make height default to width so one argument gives a square. Show it for 6.

   Passes when: #out should show 36.

5. 5.A default empty arrayexercise · medium · 10 min · practice plan

   Default the list to an empty array so counting never fails. Show the count with no argument.

   Passes when: #out should show 0.

6. 6.Fix the missing defaultbug fix · easy · 8 min

   With no default the name becomes undefined.

   Passes when: #out should show Hello friend.

7. 7.Fix the colon used instead of equalsbug fix · easy · 8 min · practice plan

   A default is written with an equals sign.

   Passes when: #out should show 50.

8. 8.Fix the default that is never usedbug fix · easy · 8 min · practice plan

   Passing null does not trigger the default.

   Passes when: #out should show Hello friend.

9. 9.Fix the default in the wrong placebug fix · easy · 8 min · practice plan

   The default is on the first parameter, so the value lands wrongly.

   Passes when: #out should show 36.

10. 10.Fix the default that crashesbug fix · easy · 8 min · practice plan

    Without a default the length of undefined cannot be read.

    Passes when: #out should show 0.

Between them these tasks cover Default parameters, Optional arguments and undefined handling.

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