R: What are operators like %in

Question

I know the basics like == and !=, or even the difference (vaguely) between & and &&. But stuff like %in

Answer 1

The help file, and the general entry, is indeed a good starting point: ?'%in%'

For example, you can see how the operator '%in%' is defined:

"%in%" <- function(x, table) match(x, table, nomatch = 0) > 0

You can even create your own operators:

'%ni%' <- Negate('%in%')