02.ClosuresAndScope

Closures and Scopes

Task 1.

• Create a module for working with books
  • The module must provide the following functionalities:
    • Add a new book to category
      • Each book has unique title, author and ISBN
      • It must return the newly created book with assigned ID
      • If the category is missing, it must be automatically created
    • List all books
      • Return an array of books
      • Books are sorted by ID
      • This can be done by author, by category or all
        • They are provided by an options object {category: ...} or {author: ...}
    • List all categories
      • Return an array of categories
      • Categories are sorted by ID
  • Each book/catagory has a unique identifier (ID) that is a number greater than 1
    • When adding a book/category, the ID is generated automatically
  • Add validation everywhere, where possible
    • Book title and category name must be between 2 and 100 characters, including letters, digits and special characters ('!', ',', '.', etc)
    • Author is any non-empty string
    • Unique params are Book title and Book ISBN
    • Book ISBN is an unique code that contains either 10 or 13 digits
    • If something is not valid - throw Error