isNegativeIntegerVector(-2)
# returns TRUE (argument is valid)
isNegativeIntegerVector("X")
# returns FALSE (argument is invalid)
#isNegativeIntegerVector("X", stopIfNot = TRUE)
# throws exception with message defined by message and argumentName parameters
isNegativeIntegerVector(-2, default = -1)
# returns -2 (the argument, rather than the default, since it is not NULL)
#isNegativeIntegerVector("X", default = -1)
# throws exception with message defined by message and argumentName parameters
isNegativeIntegerVector(NULL, default = -1)
# returns -1 (the default, rather than the argument, since it is NULL)
Run the code above in your browser using DataLab