"IO is a side effect as we discussed. IO ensures the launching of
the missiles: do it now and do it in this order. IO means that it
needs to be done in a particular order, so you say do this and
then do that and you are mutating the state of the world."
I couldn't help enjoying the following abbreviation:
"IO ensures the launching of the missiles ... and you are mutating
the state of the world."
:-)
Nikhil
PS: Also, "oh, that's not very cool, how can we launch missiles with that?"