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modular programming

The discounts get the customers flooding in

Once word gets out that there are double-discounts available in
the coffee bar, the health club gets packed with customers.

We‛ve never been so busy! The weight
room, the gym, the steam baths. The
whole place is full of customers! I like
the way you write code. I want you to
upgrade every system in the place!

Thanks to writing modular code, you got the contract to
replace all the health club systems. Modules help you write
stable, maintainable code. The more code you write in modules,
the greater the chance that you’ll be able to reuse it elsewhere.

Breaking your code into modules turns good
It's a muffin. programs into great programs.

Q: I don’t get it; why do I need to use Q: So if I hadn’t used a FQN, the Q: So, all I need to do is keep an eye

a FQN again? wrong discount is applied to the on the order when I import modules and
purchase? everything will be OK?
A: You use a Fully Qualified Name
(or FQN) when you need to distinguish A: Yes, most probably. A: No, that’s not what we recommend.
between two functions from different Don't rely on what might happen. Use a
modules that have the same name. Q: But if I hadn’t used a FQN, how FQN so that you are always in control.
With the health club systems, the would I know which discount was used?
discount() function existed within
your module and within the one supplied by A: Well... that's the problem. You
Starbuzz. In order to keep things straight, wouldn’t. It’s hard to predict what would
you had to use a FQN. happen, because it all depends on which
order the code imports its modules.
It's a latte.

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