HI, I'm very new to Javascript and i was wondering if anybody could please help me with this code. I'm not sure what to do:

question: Use object-oriented JavaScript to model a public library with three classes: library, shelf, and book. The library should be aware of a number of shelves. Each shelf should know what books it contains. Make the book object have "enshelf" and "unshelf" methods that control what shelf the book is sitting on. The library should have a method to report all books it contains.

Any help would be greatly appreciated thanks!