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JavaScript Object Methods — exercises and bug fixes

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

    easy10 min

    Add a greet method that uses the name on the object.

  2. 2

    Calculate from properties

    easy10 min

    Write an area method that multiplies the width and height.

  3. 3

    Take a parameter

    easy10 min

    Write a deposit method that adds to the balance and returns it.

  4. 4

    Call another method

    easy10 min

    Have one method call another through this.

  5. 5

    Add a method later

    medium10 min

    Add a method to an existing object and call it.

Find the bug(5)

  1. 1

    Fix the missing this

    easy8 min

    Without this the method cannot see its own property.

  2. 2

    Fix the arrow used as a method

    easy8 min

    An arrow function has no this of its own, so the name is lost.

  3. 3

    Fix the method not called

    easy8 min

    Without brackets the function itself is shown, not its result.

  4. 4

    Fix the method with no return

    easy8 min

    The method works out the answer but never gives it back.

  5. 5

    Fix the balance never stored

    easy8 min

    The method returns the new total but does not save it.

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