Inline & Extract

                      extracting functions
                              -->

      MONOLITHIC                               FRAGMENTED
   small number of                           large number of
   large functions                           small functions

                              <--
                       inlining functions

No matter what you consider the sweet spot for function size, maintaining it requires extracting and inlining to take place with equal frequency.

In your day-to-day work, do you inline functions as often as you extract them?