checkNull: Check if an argument is NULL

In checkmate: Fast and Versatile Argument Checks

Check if an argument is NULL

Description

Check if an argument is NULL

Usage

checkNull(x)

check_null(x)

assertNull(x, .var.name = vname(x), add = NULL)

assert_null(x, .var.name = vname(x), add = NULL)

testNull(x)

test_null(x)

Arguments

x	[any] Object to check.
.var.name	[character(1)] Name of the checked object to print in assertions. Defaults to the heuristic implemented in vname.
add	[AssertCollection] Collection to store assertion messages. See AssertCollection.

Value

Depending on the function prefix: If the check is successful, the functions assertNull/assert_null return x invisibly, whereas checkNull/check_null and testNull/test_null return TRUE. If the check is not successful, assertNull/assert_null throws an error message, testNull/test_null returns FALSE, and checkNull/check_null return a string with the error message. The function expect_null always returns an expectation.

See Also

Other basetypes: checkArray(), checkAtomic(), checkAtomicVector(), checkCharacter(), checkComplex(), checkDataFrame(), checkDate(), checkDouble(), checkEnvironment(), checkFactor(), checkFormula(), checkFunction(), checkInteger(), checkIntegerish(), checkList(), checkLogical(), checkMatrix(), checkNumeric(), checkPOSIXct(), checkRaw(), checkVector()

Examples

testNull(NULL)
testNull(1)

checkmate documentation built on Sept. 11, 2024, 8:40 p.m.