Returns a Boolean value indicating whether a variable has been initialized.
The expression argument can be any expression. However, because IsEmpty is used to determine if individual variables are initialized, the expression argument is most often a single variable name.
IsEmpty returns True if the variable is uninitialized, or is explicitly set to Empty; otherwise, it returns False. False is always returned if expression contains more than one variable.
The following example uses the IsEmpty function to determine whether a variable has been initialized:
Dim MyVar, MyCheck MyCheck = IsEmpty(MyVar) ' Returns True. MyVar = Null ' Assign Null. MyCheck = IsEmpty(MyVar) ' Returns False. MyVar = Empty ' Assign Empty. MyCheck = IsEmpty(MyVar) ' Returns True.