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JavaScript Expressions — exercises and bug fixes

5 hands-on exercises and 5 find-the-bug challenges for the JavaScript Expressions 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

    Evaluate an arithmetic expression

    easy10 min

    Show whether 3 * 7 equals 21.

  2. 2

    Evaluate a string expression

    easy10 min

    Join "code" and "base" and confirm the result.

  3. 3

    Use a comparison expression

    easy10 min

    Show whether 8 is greater than 3.

  4. 4

    Use a ternary expression

    easy10 min

    Show "even" or "odd" for the number 10.

  5. 5

    Combine expressions

    medium10 min

    Confirm that (2 + 3) * 2 equals ten.

Find the bug(5)

  1. 1

    Fix the precedence in the expression

    easy8 min

    Missing parentheses change the result.

  2. 2

    Fix the assignment used as an expression

    easy8 min

    A single = assigns rather than compares.

  3. 3

    Fix the reversed ternary

    easy8 min

    The two outcomes are swapped.

  4. 4

    Fix the comparison direction

    easy8 min

    The comparison points the wrong way.

  5. 5

    Fix the numeric string join

    easy8 min

    The values are joined as text instead of added.

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