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JavaScript Static Members — exercises and bug fixes

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

    Write a static method

    easy10 min

    Add a static double method and call it on the class.

  2. 2

    Add a static property

    easy10 min

    Store a version on the class and report it.

  3. 3

    Count instances

    easy10 min

    Count how many users have been created.

  4. 4

    Write a factory method

    easy10 min

    Add a static origin method that returns a point at zero.

  5. 5

    Show instances cannot see statics

    medium10 min

    Report the type of a static method read from an instance.

Find the bug(5)

  1. 1

    Fix the static called on an instance

    easy8 min

    A static method belongs to the class, not to instances.

  2. 2

    Fix the missing static keyword

    easy8 min

    Without static the method sits on instances instead of the class.

  3. 3

    Fix the counter stored per instance

    easy8 min

    An instance field gives each object its own count.

  4. 4

    Fix the factory that returns nothing

    easy8 min

    The static method builds a point but never returns it.

  5. 5

    Fix the static reading an instance property

    easy8 min

    A static method has no instance, so it cannot read this.name.

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