Declare a variable with let — practice exercise

What you'll be asked to do

1. 1.Declare a variable with letexercise · easy · 10 min

   Declare a variable named score, set it to 42, and show it.

   Passes when: Declare score with let; #out should show 42.

2. 2.Use const for a fixed valueexercise · easy · 10 min · practice plan

   Store the site name in a constant and display it.

   Passes when: Use const for siteName.

3. 3.Reassign a let variableexercise · easy · 10 min · practice plan

   Start count at 5, reassign it to 9, then show the final value.

   Passes when: Reassign count before showing it.

4. 4.Combine two variablesexercise · easy · 10 min · practice plan

   Join a first and last name into one full name.

   Passes when: Show the two names separated by a space.

5. 5.Swap two variablesexercise · medium · 10 min · practice plan

   Given a = 1 and b = 2, swap them and show them as "2,1".

   Passes when: After swapping, show a then b.

6. 6.Fix the misspelled variablebug fix · easy · 8 min

   The value never appears because the variable name is wrong.

   Passes when: #out should show 42.

7. 7.Fix the reassigned constantbug fix · easy · 8 min · practice plan

   This code throws because a const is being reassigned.

   Passes when: #out should show 9.

8. 8.Fix the variable used too earlybug fix · easy · 8 min · practice plan

   The variable is read before it is declared.

   Passes when: #out should show hello.

9. 9.Fix the missing quotesbug fix · easy · 8 min · practice plan

   A text value was written without quotes, so it is treated as a variable.

   Passes when: #out should show welcome.

10. 10.Fix the wrong concatenationbug fix · easy · 8 min · practice plan

    The full name is missing the space between the two parts.

    Passes when: #out should show Grace Hopper.

Between them these tasks cover Declaring variables, let vs const and Assignment.

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