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

is.null.

Aliases
  • assert_is_not_null
  • assert_is_null
  • is_not_null
  • is_null
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))
Documentation reproduced from package assertive.properties, version 0.0-4, License: GPL (>= 3)

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