Create an array — practice exercise

What you'll be asked to do

1. 1.Create an arrayexercise · easy · 10 min

   Create an array of three fruit names and show how many it holds.

   Passes when: #out should show 3.

2. 2.Show an empty array lengthexercise · easy · 10 min · practice plan

   Create an empty array and show its length.

   Passes when: #out should show 0.

3. 3.Store mixed typesexercise · easy · 10 min · practice plan

   Create an array holding a string, a number and a boolean, then show the type of the middle element.

   Passes when: #out should show number.

4. 4.Count a nested rowexercise · medium · 10 min · practice plan

   Create a grid of two rows with three values each and show the length of the first row.

   Passes when: #out should show 3.

5. 5.Grow a const arrayexercise · easy · 10 min · practice plan

   Push a value onto an array declared with const and show the new length.

   Passes when: #out should show 4.

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

   The array was written without separators, so it holds one value instead of three.

   Passes when: #out should show 3.

7. 7.Fix the wrong bracketsbug fix · easy · 8 min · practice plan

   Curly braces make an object, not an array, so there is no length.

   Passes when: #out should show 2.

8. 8.Fix length called as a functionbug fix · easy · 8 min · practice plan

   length is a property, not a method.

   Passes when: #out should show 5.

9. 9.Fix the flat gridbug fix · easy · 8 min · practice plan

   The grid should hold rows, but every value was put in one list.

   Passes when: #out should show row of 3.

10. 10.Fix the array that was replacedbug fix · easy · 8 min · practice plan

    Building a new array loses the earlier values instead of adding to them.

    Passes when: #out should show a,b,c.

Between them these tasks cover Array literals, length and Nested arrays.

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