Functions represent the primary way we break a program down into parts. Function declarations represent how these parts fit together—effectively, they represent the joints in our software systems. And, as with any construction, much depends on those joints. Good joints allow me to add new parts to the system easily, but bad ones are a constant source of difficulty, making it harder to figure out what the software does and how to modify it as my needs change. Fortunately, software, being soft, allows me to change these joints, providing I do it carefully.
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