How do I set different instance variable value for every different frame?

Couldn't really describe what I wanted in the title so let me explain in detail.

I have an object and it has around 100 frames each frame its a different character. Now what I wanna do is that let's say that when object.frame1 is active set instance value to x but I don't know how to do it whithout repeating the same code line 100 times.

I know that I have to use for and arrays but they confuse me and I can't find a tutorial about them.

Arrays aren`t too complex. You need them in fact. It's the best solution for this problem. Another solutions will lead to very bad code practices.