Function that extracts each unique character in a string

Question

Let's say that I have a string "rrkn". Is there a function in R that'll return a vector "r", "k", "n" (i.e. each unique character in the string)?

Answer 1

If you want to make it slightly less cumbersome to type:

uniqchars <- function(x) unique(strsplit(x, "")[[1]])