Utility functions for input validity.

Utility function to check whether an object is null or belongs to a particular class.

.check_if_null_or_belongs_to_class(
  object,
  proper_class,
  parameter_name,
  mode = "any"
)

Arguments

object	An object whose class needs checking,
proper_class	A string describing the desired class of object.
parameter_name	A string containing the name the tested parameter had in the initial function in which it was passed.
mode	Optional. A string describing the desired mode of object. Use only if proper_class is vector. Mode cannot be Date. Use proper_class = "Date" for checking class of Date vector.

Value

TRUE if all tests were passed. Throws an error otherwise.