Exercises Bookstore more

Use Case 1: Partition Books by Availability of Description

  library.partition(_.description.isDefined)

Use Case 2: Find the Most Expensive Book

  library.sortBy(-_.price).headOption

Use Case 3: Get Distinct Authors

  library.map(_.author).distinct

Use Case 4: Flatten Nested List of Book Lists

  bookLists.flatten

Use Case 5: Extract Titles of Books by a Specific Author Using flatMap

  library.flatMap(book => if (book.author.name == authorName) Some(book.title) else None)

Use Case 6: Calculate Total Price of Books Using foldLeft

  library.foldLeft(0.0)((total, book) => total + book.price)

Use Case 7: Combine Books and Authors into a Map

  library.groupBy(_.author)