How do I correctly control multiple instances of the same Object?

Hi there, apologies in advance as this is a bit of an open question and something I've been unable to wrap my brain around.

I have an object that has an instance variable called Action

When Action is 0, it does X

When Action is 1, it does Y

When Action is 2, it does Z

The problem arises when there are multiple instances of this object.

If there are two instances where Action=1, it seems that only one of them will do Y the other will do nothing.

How do I correctly sequence these, so that both of them do Y rather than just one? Is it for each or something else ... please answer like I'm 5 years old haha

You've got the answer right there - use for each object.

You shouldn't need to use a loop, as all instances that meet the conditions should have the logic applied to them. There must be something else in your code making that happen.