Check if an argument is NULL
Check if an argument is NULL
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)
x |
[any] |
.var.name |
[ |
add |
[ |
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 returns a string with the error message.
The function expect_null always returns an
expectation.
Other basetypes:
checkArray(),
checkAtomicVector(),
checkAtomic(),
checkCharacter(),
checkComplex(),
checkDataFrame(),
checkDate(),
checkDouble(),
checkEnvironment(),
checkFactor(),
checkFormula(),
checkFunction(),
checkIntegerish(),
checkInteger(),
checkList(),
checkLogical(),
checkMatrix(),
checkNumeric(),
checkPOSIXct(),
checkRaw(),
checkVector()
testNull(NULL) testNull(1)
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