Add up an array — practice exercise

What you'll be asked to do

1. 1.Add up an arrayexercise · easy · 10 min

   Add every number in the array together and show the total.

   Passes when: #out should show 100.

2. 2.Join the valuesexercise · easy · 10 min · practice plan

   Join the fruit names together with a comma.

   Passes when: #out should show Apple,Banana,Mango.

3. 3.Count the lettersexercise · easy · 10 min · practice plan

   Count how many characters are in the text, ignoring spaces.

   Passes when: #out should show 6.

4. 4.Use the index with entriesexercise · easy · 10 min · practice plan

   Show each fruit with its index, joined by commas.

   Passes when: #out should show 0:Apple,1:Banana.

5. 5.Find the largest numberexercise · medium · 10 min · practice plan

   Find the largest number in the array and show it.

   Passes when: #out should show 44.

6. 6.Fix for in used instead of for ofbug fix · easy · 8 min

   for in gives the index, so the totals are wrong.

   Passes when: #out should show 100.

7. 7.Fix the index treated as a valuebug fix · easy · 8 min · practice plan

   This joins the indexes instead of the fruit names.

   Passes when: #out should show the fruit names.

8. 8.Fix the missing entries callbug fix · easy · 8 min · practice plan

   Without entries there is no index to unpack.

   Passes when: #out should show the index before the name.

9. 9.Fix the comparison that never updatesbug fix · easy · 8 min · practice plan

   The comparison is the wrong way round, so the smallest wins.

   Passes when: #out should show 44.

10. 10.Fix the break that should be continuebug fix · easy · 8 min · practice plan

    The loop stops at the first space instead of skipping it.

    Passes when: #out should show 4.

Between them these tasks cover for of, Iterating values and entries and destructuring.

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