Challenge 1: A Book Class — Solution

class Book
  attr_accessor :title, :author, :pages

  def initialize(title, author, pages)
    @title = title
    @author = author
    @pages = pages
  end
end

book1 = Book.new("The Hobbit", "J.R.R. Tolkien", 310)
book2 = Book.new("Dune", "Frank Herbert", 412)

puts book1.title
puts book2.title

=begin
Output:
The Hobbit
Dune

Notes:
- attr_accessor :title, :author, :pages generates a getter and setter for
  all three in one line, rather than writing six methods by hand.
- initialize runs automatically when Book.new(...) is called, assigning
  each constructor argument to its matching @instance_variable.
- book1.title and book2.title call the generated getter methods — no
  direct access to @title from outside the class is needed or possible.
=end