VBScript IsEmpty Function

Returns a Boolean value indicating whether a variable has been initialized.

Syntax: VBScript IsEmpty Function

IsEmpty(expression)

Arguments: VBScript IsEmpty Function

expression

Any expression. However, because IsEmpty is used to determine if individual variables are initialized, the expression argument is most often a single variable name.

Remarks: VBScript IsEmpty Function

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.