Design Patterns I: JavaScript Classes?!?

JavaScript doesn't really have classes like other languages. They are actually functions behind the scenes. There are several ways to create classes.

Challenge

• Create a Book class using a JavaScript function - instantiable.

• It should have an author and published property.

• Create an Author class using a literal object - singleton.

• It should have a name and books property.

• Create a Publisher class by using the new constructor and an anonymous function - singleton.

• It should have an authors and books property.

• Create a Review class using a class declaration - instantiable.

• It should have a rating and user property.

Bonus (optional)

Create a Bookstore class using an IIFE - singleton. It should have a books and prices property.

Notes

• All classes should begin with Capital letters.
• All class properties should have default(initial) values.