ISEmpty Function

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

Syntax

IsEmpty(expression)

Remarks

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:

Example 1:

Dim MyVar, MyCheck 
MyCheck = IsEmpty(MyVar)  
' Output: True.

Example 2:

MyVar = Empty   ' Assign Empty.
MyCheck = IsEmpty(MyVar)   
' Output: True.

Example 3:

MyVar = 10 ' Assign Value 10.
MyCheck = IsEmpty(MyVar)  
' Output: False.