Truth checking as in Python

Returns TRUE if x is either FALSE, 0, NULL, NAand empty lists or an empty string. Inspired by python's bool.

Usage

is.none(x)

Arguments

x

object to test

Value

TRUE if x is FALSE, 0, NULL, NA, an empty list or an empty string. Else FALSE.

Examples

is.none(FALSE) # TRUE
#> [1] TRUE
is.none(0) # TRUE
#> [1] TRUE
is.none(1) # FALSE
#> [1] FALSE
is.none(NA) # TRUE
#> [1] TRUE
is.none(list()) # TRUE
#> [1] TRUE
is.none("") # TRUE
#> [1] TRUE
is.none(character()) # TRUE
#> [1] TRUE
is.none(numeric()) # TRUE
#> [1] TRUE
is.none(logical()) # TRUE
#> [1] TRUE