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JavaScript super Keyword — exercises and bug fixes

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

    Call the parent constructor

    easy10 min

    Pass the name up to the parent with super.

  2. 2

    Call a parent method

    easy10 min

    Use super.describe to build on the parent's answer.

  3. 3

    Add a property after super

    easy10 min

    Call super first, then set the child's own property.

  4. 4

    Rely on the automatic super

    easy10 min

    Leave the child constructor out and let the arguments pass through.

  5. 5

    Wrap the parent's work

    medium10 min

    Have the child add to what the parent method returns.

Find the bug(5)

  1. 1

    Fix the missing super call

    easy8 min

    A child constructor must call super before using this.

  2. 2

    Fix this used before super

    easy8 min

    The instance does not exist until super has run.

  3. 3

    Fix the parent method rewritten

    easy8 min

    The child duplicates the parent instead of calling it.

  4. 4

    Fix super called as a method

    easy8 min

    In a constructor super is called directly, not as super.constructor.

  5. 5

    Fix the wrapped message lost

    easy8 min

    The child should pass its extra text through the parent method.

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