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JavaScript Operators — exercises and bug fixes

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

    Add two numbers

    easy10 min

    Show the sum of 12 and 8.

  2. 2

    Find a remainder

    easy10 min

    Show the remainder of 17 divided by 5.

  3. 3

    Use exponentiation

    easy10 min

    Show 2 raised to the power of 5.

  4. 4

    Compare two values strictly

    easy10 min

    Show whether 10 is strictly equal to the string "10".

  5. 5

    Respect operator precedence

    medium10 min

    Show the result of 2 plus 3, multiplied by 4.

Find the bug(5)

  1. 1

    Fix the precedence mistake

    easy8 min

    The parentheses are missing, so the result is wrong.

  2. 2

    Fix the assignment used as a comparison

    easy8 min

    A single = overwrites x instead of comparing it, so this wrongly reports true.

  3. 3

    Fix the division that should be a remainder

    easy8 min

    This should report the remainder, not the quotient.

  4. 4

    Fix the increment placement

    easy8 min

    Post-increment shows the old value instead of the new one.

  5. 5

    Fix the inverted comparison

    easy8 min

    The comparison operator points the wrong way.

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