Assert that two objects share no values — assert

Checks that x and y have no values in common (their intersection is empty).

Usage

assert_disjoint(
  x,
  y,
  null_ok = FALSE,
  arg = rlang::caller_arg(x),
  arg_y = rlang::caller_arg(y),
  call = rlang::caller_env()
)

x: Object to check.
y: The object that x must not overlap with.
null_ok: Single logical. If TRUE, a NULL value passes the check without error. Use this for optional arguments that default to NULL. Defaults to FALSE, so NULL is rejected unless you opt in.
arg: Name used to refer to x in error messages. Defaults to the name of the expression passed as x.
arg_y: Name used to refer to y in error messages. Defaults to the name of the expression passed as y.
call: Environment used as the error's call context. Defaults to the calling function, so errors point at the user's code.

The input x, invisibly.

assert_disjoint(c("a", "b"), c("c", "d"))