account.rb

class Account
  def initialize(pin)
    @pin = pin
  end

  def can_access?(pin)
    @pin == pin
  end

  def change_pin(pin, new_pin)
    if can_access?(pin)
      @pin = new_pin
      puts "Pin successfully changed"
    else
      puts "Go away you dirty hacker"
    end
  end
end