I think it would be worth perusing (not buying), just to see if he still recommends that procedures (routines with side effects) should never return any value,

I think it would be worth perusing (not buying), just to see if he still recommends that procedures (routines with side effects) should never return any value, but should instead set one or more member variables - one or more per procedure - which callers should access after the call by separate getter methods. Really.