Checks whether the value of a given Property is Undefined.
Syntax
ISUNDEFINED (value)
Data Types of the Argument
True/False, Integer, Number, Length, Area, Volume, Angle, or String
Data Type of the Result
True/False
Example
Determine whether an element’s string-type “Model” property is undefined. ISUNDEFINED is a logical value.
Expression
ISUNDEFINED (Model)
Result
True for every element whose Model property is <Undefined>