ESAAS HW0 Part 3

hw0-part3.rb

class BookInStock
  # declare setters and getters
  attr_accessor :isbn, :price

  def initialize(isbn, price)
    # checking for empty string or price is greater 0, raises exception
    raise ArgumentError if isbn.strip.empty? || price <= 0
    @isbn, @price = isbn, price
  end

  def price_as_string
    # using a formatting string to convert to money representation
    sprintf '$%.2f', price
  end
end