Check the basic range — practice exercise

What you'll be asked to do

1. 1.Check the basic rangeexercise · easy · 10 min

   Report that a random value falls from zero up to one.

   Passes when: #out should show in range.

2. 2.Make a whole numberexercise · easy · 10 min · practice plan

   Produce a whole number from zero to nine and check it.

   Passes when: #out should show in range.

3. 3.Roll a diceexercise · easy · 10 min · practice plan

   Produce a value from one to six and check it.

   Passes when: #out should show valid roll.

4. 4.Use any rangeexercise · easy · 10 min · practice plan

   Write a function giving a value between ten and twenty inclusive.

   Passes when: #out should show in range.

5. 5.Pick from an arrayexercise · medium · 10 min · practice plan

   Choose a random colour and confirm it came from the list.

   Passes when: #out should show picked one.

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

   Without floor the dice value is a decimal.

   Passes when: #out should show valid roll.

7. 7.Fix round used instead of floorbug fix · easy · 8 min · practice plan

   Rounding can reach ten, which is outside the wanted range.

   Passes when: #out should show floor was used.

8. 8.Fix the range missing its top valuebug fix · easy · 8 min · practice plan

   Without the plus one the maximum can never appear.

   Passes when: #out should show includes the top.

9. 9.Fix the index off the endbug fix · easy · 8 min · practice plan

   Multiplying by the length gives a valid index only after flooring.

   Passes when: #out should show picked one.

10. 10.Fix the minimum never addedbug fix · easy · 8 min · practice plan

    Without adding the minimum the range starts at zero.

    Passes when: #out should show in range.

Between them these tasks cover Math.random, Ranges and Random selection.

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