Comprehensive Ruby Programming

I don't like change!

However, this OrderReport class has a nasty secret: it doesn't like change. Let's imagine that we're asked to update the bill_of_lading method to also print out the customer address:

class OrderReport  def initialize(customer:, total:, address:)    @customer = customer    @total = total    @address = address  end  def invoice    puts "Invoice"    puts @customer    puts @total  end  def bill_of_lading    puts "BOL"    puts @customer    puts "Shipping Label..."    puts @address  endendorder = OrderReport.new(customer: "Google",                         total: 100,                         address: "123 Any Street")order.invoiceorder.bill_of_lading 

This may not seem like a major change; however, in order to accommodate the request, we had to make four changes.

One of the changes is even requiring us to pass ...