We want our modules to be polite. Polite modules follow Ward Cunningham’s definition of cleanliness. As you read the code, you find it to be “pretty much what you expected.”
A module is a bounded set of functions and variables. This might be composed of one class, several classes, or no classes at all. What matters are the functions and variables. A module may also be contained in a single source file or several source files. What matters is the cohesion of the functions and variables, and not the artificial boundaries that separate them. Another common word for a module is a component.
If you follow something roughly akin to Extract ...
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