VBS TUTORIAL: function-isempty function _vbs

IsEmpty function

Returns a Boolean value that indicates whether the variable has been initialized.

IsEmpty(expression)

The expression parameter can be any expression. However, because IsEmpty is used to determine whether a variable has been initialized, the expression argument is often a variable name.

Description

If the variable is uninitialized or explicitly set to Empty, the function isempty returns True; otherwise, the function returns False. If expression contains more than one variable, the total returns False.

The following example uses the IsEmpty function to determine whether a variable can be initialized:

IsEmpty(MyVar) ' Return  True . MyVar = Null                  assigned to  Null . IsEmpty(MyVar) ' return  False . MyVar = Empty                 assigned to  Empty . IsEmpty(MyVar) ' return  True .