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IsEmpty( ) vba function

Determines if a variable isn't set yet.

Immediate Window

s = null
? ismissing(s)
False

? isempty(s)
True

? isempty("")
False
? isempty(y)
True

? isempty(0)
False

I created a bug by adding & "" to a request.querystring("xyz") & ""

and testing for isEmpty()