Returns the value True or False depending if the Variant variable has been initialised (Boolean).

expressionThe expression to test (Variant).

* The "expression" can be a numeric or string expression, but most often it is a single variable name.
* The value returned is True if the variable if explicitly set to Empty.
* For more information, refer to the Data Types > Empty page.
* For the Microsoft documentation refer to

Debug.Print IsEmpty("a")     '= False  
Debug.Print IsEmpty(100) '= False
Debug.Print IsEmpty("") '= False
Debug.Print IsEmpty() '= False
Debug.Print IsEmpty(Nothing) '= False
Debug.Print IsEmpty(Null) '= False

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