Note on A Philosophy of Software Design via John Ousterhout

Deep and shallow modules:

The best modules are deep: they allow a lot of functionality to be accessed through a simple interface. A shallow module is one with a relatively complex interface, but not much functionality: it doesn’t hid much complexity.

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FROM:

John Ousterhout

A Philosophy of Software Design

Interface is a cost (you want to reduce it), functionality is a benefit (you want to increase it)