I'm trying to write a function that takes several objects with many
different attributes and then changes their attributes. So what I wanted to
happen in the simplified example below is for the function to change the
attributes of the objects state1 and state2 that are passed to it. But
because stateA and stateB are local, this isn't working. Are there any easy
solutions?

e.g., if I could combine the two objects stateA and stateB into a single
object, I could return it and then assign it back to objects state1 and
state2. Or if I could pass a pointer to the original object.. But I cannot
find an easy way of doing either.  Thanks in advance..

state1 <- list(n=100, won=0)
state2 <- list(n=100, won=0)

fight2 <- function(stateA, stateB){
   stateA$n <- 50
   stateB$n <-50
}

fight2(state1,state2)

state1$n
state2$n

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