> Personally the distinction between subroutines and functions always struck me as overly math-centric thinking, because it's not an interesting difference as s

> Personally the distinction between subroutines and functions always struck me as overly math-centric thinking, because it's not an interesting difference as soon as non-local state exists, which is almost always the case. It's about command/query separation which is still a best practive to this day.