Adding New Functions Without Changing Any Code?

In the check out example, we're adding pay pound. Now it's easy to add new functions without changing the existing data structure. The credit card stuff is totally isolated. And you don't even know what type of payment system you got. Pa has all sorts of weird back and forth stuff, and makes ira. Wich ist a good time to bring up the law of demeter, which is the next section. Soisel one isl that. It is time of year, isn't it? Wais nelta true? You never had stand im d had to on the check out page, and you addi if at the no confirmation and you hadd it,