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IsEmpty(Variant)
Checks whether the passed Variant variable has been initialized.
See also: IsDate, IsNull, IsNumeric, VarType, section Special behavior of the Variant data type
Example:
Sub Main
Dim x ' Empty because no value was assigned
MsgBox "IsEmpty(x): " & IsEmpty(x)
x = 5 ' Is not empty anymore
MsgBox "IsEmpty(x): " & IsEmpty(x)
x = Empty ' Is empty again
MsgBox "IsEmpty(x): " & IsEmpty(x)
End Sub