If I create an UDF and use Dim to create some variables do I have to
make sure by the end of the function these variables are set to =
Nothing
Here's an example:
Function FindRing(rng As Range) As String
Dim cell As Range
Dim strColumn As String
Dim intDelim As Integer
Dim intColCount As Integer
For Each cell In rng
If UCase(cell.Value) = "X" Then
intDelim = InStr(2, cell.Address, "$") - 1 'Minus one to
strip $ sign out. Posts back $A$ or $AA$
intColCount = Len(Left(cell.Address, intDelim)) - 1 'Trims
the left $ sign
strColumn = UCase(Right(Left(cell.Address, intDelim),
intColCount)) 'Trims the cell.address to just the columns
'MsgBox strColumn 'Used for troubleshooting
Select Case True
Case strColumn = "B"
FindRing = "S2"
Exit Function
Case strColumn = "C"
FindRing = "D2"
Exit Function
Case strColumn = "D"
FindRing = "S2"
Exit Function
Case strColumn = "E"
FindRing = "S2"
Exit Function
Case strColumn = "F"
FindRing = "S2"
Exit Function
Case strColumn = "G"
FindRing = "D2"
Exit Function
Case strColumn = "H"
FindRing = "S2"
Exit Function
Case strColumn = "I"
FindRing = "S2"
Exit Function
Case strColumn = "J"
FindRing = "D2"
Exit Function
End Select
End If
Next
End Function
I'm worried about the performance of my sheet. I have a laptop that
can handle these UDF's w/o any noticeable performance hits, but I'm
building this for sub-par machines. Can anyone offer some guidance to
the best practices when building UDF's?
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