function for finding non-identical elements in two vectors

Question

Simple question, but didn't find it on stackoverflow. Is there a function for finding all non-identical values:

x <- c("a","b","c","d")
y <- c("a","f","g","c","d")

result should be:

res <- c("b","f","g")

All functions seem to only work for one vector. setdiff() etc.

Answer 1

This popped up on Tony Breyal's blog a few years ago, you can see several solutions there, here's the shortest one:

c(setdiff(x,y),setdiff(y,x))

Answer 2

setdiff(union(x, y), intersect(x, y))