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

IsEmpty("a") = False 
IsEmpty(100) = False
IsEmpty("") = False
IsEmpty() = False
IsEmpty(Nothing) = False
IsEmpty(Null) = False

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