5.5. Checking Classes and Attributes
When you start identifying classes in a new domain, you are likely to pick up a few candidates that appear to be classes when, in fact, they are not. Here are some checks that will help you reject these imposters.
All of these checks require a firm grasp on the definition of the class. Each potential instance of a class should have the same characteristics and conform to the same rules as the others. (Interpret “rules” liberally here: laws, organizational policies, laws of physics, custom, and so forth.) In other words, each instance must have the same data and the same behavior as the others.
If a class fails one or more of these checks, you may not have a good abstraction, or you may not have a good grasp ...
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