VBA check if object is set

Question

I have a global variable that is an instance of my custom class.

How do I check if the object is set or if I need to initialize it?

Answer 1

If obj Is Nothing Then
    ' need to initialize obj: '
    Set obj = ...
Else
    ' obj already set / initialized. '
End If

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Or, if you prefer it the other way around:

If Not obj Is Nothing Then
    ' obj already set / initialized. '
Else
    ' need to initialize obj: '
    Set obj = ...
End If