Denver Public Library (DPL)

Preparation

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Iteration 1

Use TDD to create a Book class that responds to the following interaction pattern. For the publication_year method, assume that the year is always the last four characters of the publication date.

pry(main)> require './lib/book'
#=> true

pry(main)> book = Book.new({author_first_name: "Harper", author_last_name: "Lee", title: "To Kill a Mockingbird", publication_date: "July 11, 1960"})
#=> #<Book:0x00007fcc021fad08...>

pry(main)> book.title
#=> "To Kill a Mockingbird"

pry(main)> book.author
#=> "Harper Lee"

pry(main)> book.publication_year
#=> "1960"

Iteration 2

Use TDD to create an Author class that responds to the following interaction pattern.

The write method must take two Strings as arguments and return an instance of Book.

pry(main)> require './lib/book'
#=> true

pry(main)> require './lib/author'
#=> true

pry(main)> charlotte_bronte = Author.new({first_name: "Charlotte", last_name: "Bronte"})
#=> #<Author:0x00007fb898081850...>

pry(main)> charlotte_bronte.name
#=> "Charlotte Bronte"

pry(main)> charlotte_bronte.books
#=> []

pry(main)> jane_eyre = charlotte_bronte.write("Jane Eyre", "October 16, 1847")
#=> #<Book:0x00007fb896e22538...>

pry(main)> jane_eyre.class
#=> Book

pry(main)> jane_eyre.title
#=> "Jane Eyre"

pry(main)> villette = charlotte_bronte.write("Villette", "1853")
#=> #<Book:0x00007fb8980aaca0...>

pry(main)> charlotte_bronte.books
#=> [#<Book:0x00007fb896e22538...>, #<Book:0x00007fb8980aaca0...>]

Iteration 3

Use TDD to create a Library class that responds to the following interaction pattern.

The publication_time_frame_for method takes an Author object as an argument and returns a hash with two key/value pairs:

:start which points to the publication year of the Author's first book.
:end which points to the publication year of the Author's last book.

pry(main)> require './lib/library'
#=> true

pry(main)> require './lib/author'
#=> true

pry(main)> dpl = Library.new("Denver Public Library")
#=> #<Library:0x00007fbeea3653c0...>

pry(main)> dpl.name
#=> "Denver Public Library"

pry(main)> dpl.books
#=> []

pry(main)> dpl.authors
#=> []

pry(main)> charlotte_bronte = Author.new({first_name: "Charlotte", last_name: "Bronte"})
#=> #<Author:0x00007fbeea2d78b8...>

pry(main)> jane_eyre = charlotte_bronte.write("Jane Eyre", "October 16, 1847")    
#=> #<Book:0x00007fbeeb3beca8...>

pry(main)> professor = charlotte_bronte.write("The Professor", "1857")
#=> #<Book:0x00007fbeea8efd90...>

pry(main)> villette = charlotte_bronte.write("Villette", "1853")
#=> #<Book:0x00007fbeea24fbe8...>

pry(main)> harper_lee = Author.new({first_name: "Harper", last_name: "Lee"})
#=> #<Author:0x00007fbeea112730...>

pry(main)> mockingbird = harper_lee.write("To Kill a Mockingbird", "July 11, 1960")
#=> #<Book:0x00007fbeeb1089f0...>

pry(main)> dpl.add_author(charlotte_bronte)

pry(main)> dpl.add_author(harper_lee)

pry(main)> dpl.authors
=> [#<Author:0x00007fbeea2d78b8...>, #<Author:0x00007fbeea112730...>]

pry(main)> dpl.books
=> [#<Book:0x00007fbeeb3beca8...>, #<Book:0x00007fbeea8efd90...>, #<Book:0x00007fbeea24fbe8...>, #<Book:0x00007fbeeb1089f0...>]

pry(main)> dpl.publication_time_frame_for(charlotte_bronte)
#=> {:start=>"1847", :end=>"1857"}

pry(main)> dpl.publication_time_frame_for(harper_lee)
#=> {:start=>"1960", :end=>"1960"}

Iteration 4

Use TDD to implement the following methods on the Library class:

The checkout method takes a Book as an argument. It should return false if a Book does not exist in the library or it is already checked out. Otherwise, it should return true indicating that the book has been checked out.

The checked_out_books method should return an array of books that are currently checked out.

The return method takes a Book as an argument. Calling this method means that a book is no longer checked out.

The most_popular_book method should return the book that has been checked out the most.