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JavaScript Math Object — exercises and bug fixes

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

    Remove the sign

    easy10 min

    Report the absolute value of minus five.

  2. 2

    Find a square root

    easy10 min

    Report the square root of 144.

  3. 3

    Raise to a power

    easy10 min

    Use Math.pow to report two to the tenth.

  4. 4

    Measure a distance

    easy10 min

    Report how far apart three and eight are.

  5. 5

    Work out a circle area

    medium10 min

    Report the rounded area of a circle of radius three.

Find the bug(5)

  1. 1

    Fix Math used with new

    easy8 min

    Math is not a constructor.

  2. 2

    Fix the missing Math prefix

    easy8 min

    sqrt is a method of Math, not a global function.

  3. 3

    Fix the distance without abs

    easy8 min

    The difference is negative, so the sign must be removed.

  4. 4

    Fix PI written by hand

    easy8 min

    Use the built-in constant rather than a rough value.

  5. 5

    Fix the arguments to pow swapped

    easy8 min

    The base comes first and the exponent second.

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