Add up any number of values — practice exercise

What you'll be asked to do

1. 1.Add up any number of valuesexercise · easy · 10 min

   Use a rest parameter to add 1, 2, 3 and 4.

   Passes when: #out should show 10.

2. 2.Count the extrasexercise · easy · 10 min · practice plan

   Count how many scores were passed after the title.

   Passes when: #out should show 3.

3. 3.An empty rest parameterexercise · easy · 10 min · practice plan

   Show the length when no extra arguments are given.

   Passes when: #out should show 0.

4. 4.Use an array methodexercise · easy · 10 min · practice plan

   Find the largest of 5, 12, 8 and 44 using a rest parameter.

   Passes when: #out should show 44.

5. 5.Spread into a rest parameterexercise · medium · 10 min · practice plan

   Spread an array of three items into a function that collects them, then show the count.

   Passes when: #out should show 3.

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

   Without the three dots only the first argument is received.

   Passes when: #out should show 10.

7. 7.Fix the rest parameter used firstbug fix · easy · 8 min · practice plan

   A rest parameter must be last, so the title is being swallowed.

   Passes when: #out should show 3.

8. 8.Fix the undefined lengthbug fix · easy · 8 min · practice plan

   Reading length on a plain parameter that was never passed fails.

   Passes when: #out should show 0.

9. 9.Fix the array passed wholebug fix · easy · 8 min · practice plan

   Math.max needs separate numbers, not one array.

   Passes when: #out should show 44.

10. 10.Fix the array passed as one argumentbug fix · easy · 8 min · practice plan

    Without spreading, the function receives a single array.

    Passes when: #out should show 3.

Between them these tasks cover Rest parameters, Variable arguments and Rest vs spread.

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