is.none {matchr} | R Documentation |
Test whether Option Enum is Some or None.
is.none(x)
x |
object to be tested |
TRUE
if x
is enumerated type of variant None
, FALSE
otherwise
x <- 1:5
get_n <- function(x, n) {
if (n > length(x)) return(None)
Some(x[n])
}
obj <- get_n(x, 6)
is.none(obj) # TRUE