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JavaScript if Statement — exercises and bug fixes

5 hands-on exercises and 5 find-the-bug challenges for the JavaScript if Statement lesson. Every one is checked automatically in the browser — write the code, run it, and the tests tell you what still fails.

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Exercises(5)

  1. 1

    Show a message when true

    easy10 min

    If age is 20, show "adult".

  2. 2

    Test a string value

    easy10 min

    If the role is "admin", show "allowed".

  3. 3

    Check an empty list

    easy10 min

    If the cart has no items, show "empty".

  4. 4

    Combine two conditions

    easy10 min

    If the user is logged in AND verified, show "welcome".

  5. 5

    Guard against a missing value

    medium10 min

    Only show the name when it is present; here it is "Sam".

Find the bug(5)

  1. 1

    Fix the assignment in the condition

    easy8 min

    A single = makes this condition always run.

  2. 2

    Fix the inverted condition

    easy8 min

    The branches sit on the wrong side of the test, so a 20-year-old is labelled a minor.

  3. 3

    Fix the loose equality

    easy8 min

    Loose equality lets a string match a number.

  4. 4

    Fix the misplaced semicolon

    easy8 min

    A semicolon right after if() ends the statement early.

  5. 5

    Fix the wrong logical operator

    easy8 min

    OR is used where both conditions must hold.

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