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JavaScript Object Constructors — exercises and bug fixes

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

    easy10 min

    Write a Person constructor and build one with the name Ada.

  2. 2

    Store two properties

    easy10 min

    Build a Car with a brand and year and show both.

  3. 3

    Build two separate objects

    easy10 min

    Build two cars and show that they hold different brands.

  4. 4

    Add a prototype method

    easy10 min

    Put a greet method on the prototype and call it.

  5. 5

    Use a class instead

    medium10 min

    Write the same thing as a class and call its method.

Find the bug(5)

  1. 1

    Fix the missing new keyword

    easy8 min

    Without new the constructor builds nothing and returns undefined.

  2. 2

    Fix the parameter never stored

    easy8 min

    The constructor takes a name but never puts it on the object.

  3. 3

    Fix the shared object

    easy8 min

    Returning one fixed object means every car is the same one.

  4. 4

    Fix the method on the wrong place

    easy8 min

    The method was put on the constructor itself, not its prototype.

  5. 5

    Fix the class constructor named wrongly

    easy8 min

    The setup method must be called constructor.

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