Returns a Boolean value indicating whether a variable has been initialized.
IsEmpty(expression) |
The required expression argument is a numeric or string 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.
This example uses the IsEmpty function to determine whether a variable has been initialized.
Dim MyVar, MyCheck MyCheck = IsEmpty(MyVar) ' Returns True. Trace MyCheck MyVar = Null ' Assign Null. MyCheck = IsEmpty(MyVar) ' Returns False. Trace MyCheck MyVar = Empty ' Assign Empty. MyCheck = IsEmpty(MyVar) ' Returns True. Trace MyCheck |
See Also |
IsDate Function , IsNull Function , IsNumeric Function , VarType Function |