Odd if statement/varialbles question?

I wasn’t even sure how to search to see if this existed.

Say I have a list (array) of functions
s_0, s_1, s_2, etc… probably going to be 30 or so in the list.

Is there a way to do an if statement so that…

if the last function == s_0 … do this thing
else the last function == s_2 … do this other thing

i’m basically doing a linear presentation of functions
and i need the ability to go foward and backwards… but the animations/functions may be different depending on the direction, up or down in the list.

Help? :puzzled: