assert_is_not_null
Is the input (not) null?
Checks to see if the input is (not) null.
Usage
assert_is_not_null(x, severity = getOption("assertive.severity", "stop"))
assert_is_null(x, severity = getOption("assertive.severity", "stop"))
is_not_null(x, .xname = get_name_in_parent(x))
is_null(x, .xname = get_name_in_parent(x))Arguments
- x
- Input to check.
- severity
- How severe should the consequences of the assertion be?
Either
"stop","warning","message", or"none". - .xname
- Not intended to be used directly.
Value
is_null wraps is.null, providing more
information on failure. is_not_null returns TRUE in
the opposite case. The assert_* functions return nothing but
throw an error if the corresponding is_* function returns
FALSE.
See Also
Examples
library(assertive.properties)
# Predicate for NULL.
is_null(NULL)
is_null(c())
# Atomic vectors of length zero are not NULL!
is_null(numeric())
# ... and neither is NA
is_null(NA)
# The opposite check
is_not_null(NULL)
is_not_null(c())
is_not_null(numeric())
# These checks should pass
assert_is_null(NULL)
assert_is_null(c())
assert_is_not_null(NA)
# This should fail
assertive.base::dont_stop(assert_is_null(NaN))
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