Group statements in a block — practice exercise

What you'll be asked to do

1. 1.Group statements in a blockexercise · easy · 10 min

   Put two statements inside an if block and show the result.

   Passes when: #out should show grouped.

2. 2.Use a standalone blockexercise · easy · 10 min · practice plan

   A bare { } block is valid — use one and show "blocked".

   Passes when: #out should show blocked.

3. 3.Scope a variable to a blockexercise · easy · 10 min · practice plan

   Declare inside a block and read it there.

   Passes when: #out should show scoped.

4. 4.Read an outer variable inside a blockexercise · easy · 10 min · practice plan

   Inner blocks can read outer values.

   Passes when: #out should show outer.

5. 5.Shadow a name in a blockexercise · medium · 10 min · practice plan

   An inner block can declare its own version of a name.

   Passes when: #out should show inner.

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

   Only the first line belongs to the if without braces.

   Passes when: #out should show guarded.

7. 7.Fix the variable read outside its blockbug fix · easy · 8 min · practice plan

   A const declared in a block is not visible outside it.

   Passes when: #out should show scoped.

8. 8.Fix the unclosed blockbug fix · easy · 8 min · practice plan

   A missing closing brace breaks the whole script.

   Passes when: #out should show closed.

9. 9.Fix the shadowed namebug fix · easy · 8 min · practice plan

   The inner declaration hides the value that should be shown.

   Passes when: #out should show outer.

10. 10.Fix the block attached to nothingbug fix · easy · 8 min · practice plan

    The condition is separated from its block by a semicolon.

    Passes when: #out should show conditional.

Between them these tasks cover Block statements and Block scope.

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