Read the first element — practice exercise

What you'll be asked to do

1. 1.Read the first elementexercise · easy · 10 min

   Show the first element of an array of fruit names.

   Passes when: #out should show Apple.

2. 2.Read the last elementexercise · easy · 10 min · practice plan

   Show the last element using the array length.

   Passes when: #out should show Mango.

3. 3.Use at with a negative indexexercise · easy · 10 min · practice plan

   Show the second-to-last element using at().

   Passes when: #out should show Banana.

4. 4.Replace an elementexercise · easy · 10 min · practice plan

   Replace the middle element with Cherry and show the whole list joined by commas.

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

5. 5.Read from a nested arrayexercise · medium · 10 min · practice plan

   Show the value in the second row, first column of a grid.

   Passes when: #out should show 30.

6. 6.Fix the off-by-one first elementbug fix · easy · 8 min

   Counting starts at 0, not 1.

   Passes when: #out should show Apple.

7. 7.Fix the last element past the endbug fix · easy · 8 min · practice plan

   Using length as an index reads one place too far.

   Passes when: #out should show Mango.

8. 8.Fix the index in quotesbug fix · easy · 8 min · practice plan

   A string is treated as a property name, not a position.

   Passes when: #out should show Banana.

9. 9.Fix at used with a positive onebug fix · easy · 8 min · practice plan

   at(1) is the second element, not the last.

   Passes when: #out should show Mango.

10. 10.Fix the single bracket on a gridbug fix · easy · 8 min · practice plan

    One pair of brackets gives a whole row, not a value.

    Passes when: #out should show 30.

Between them these tasks cover Indexes, at() and Nested access.

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