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IsMissing(var)

This IsMissing() function is used to determine whether an Optional parameter was passed or not


Define the following sub


Sub Test2(s,Optional s2)

if IsMissing(s2) Then
   s2 = "Default"
End if
debug.Print s2

End Sub




And run the following from the
Immediate Window


test2 "the s value"

test2 "svalue", "optional value"