Assert that at least one of several arguments is supplied — assert_at_least_one • assert

Treats a NULL argument as "not supplied". Raises an error if every argument in ... is NULL.

Usage

assert_at_least_one(..., call = rlang::caller_env())

Arguments

...: Two or more arguments to check, typically optional parameters of the calling function that default to NULL.
call: Environment used as the error's call context. Defaults to the calling function, so errors point at the user's code.

Value

NULL, invisibly.

Examples

fetch <- function(id = NULL, name = NULL) {
  assert_at_least_one(id, name)
  "ok"
}
fetch(name = "ada")
#> [1] "ok"