Check if an object is NULL, NA, or length zero

This utility function returns TRUE if the input is NULL, has length zero, or is an NA of length one. Otherwise returns FALSE.

Usage

is.nulla(x)

Arguments

x

Any R object.

Value

A logical scalar: TRUE if x is considered "null-like", otherwise FALSE.

Examples

is.nulla(NULL)
#> [1] TRUE
is.nulla(NA)
#> [1] TRUE
is.nulla(character(0))
#> [1] TRUE
is.nulla(1)   # FALSE
#> [1] FALSE