> A function and API is always an abstraction To a degree, yes. But they're not always introduced for that reason. There are cases, where the caller is expecte

> A function and API is always an abstraction To a degree, yes. But they're not always introduced for that reason. There are cases, where the caller is expected to fully understand the implementation of a function, yet it may still provide value, for example, by: - ...reducing the mental demand for understanding the calling code by making it easier to visually scan. - ...reducing the mental demand for understanding the called code by narrowing the scope of the logic through parameters / encapsulation / etc... - ...preventing repetition by being callable from multiple places