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This function walks through a Range and returns a Collection of the unique values
Public Function CollectUniques(rng As Range) As Collection
Dim varArray As Variant, var As Variant
Dim col As Collection
'Guard clause - if Range is nothing, return a Nothing collection
'Guard clause - if Range is empty, return a Nothing collection
If rng Is Nothing Or WorksheetFunction.CountA(rng) = 0 Then
Set CollectUniques = col
Exit Function
End If
If rng.Count = 1 Then '<~ check for a single cell range
Set col = New Collection
col.Add Item:=CStr(rng.Value), Key:=CStr(rng.Value)
Else '<~ otherwise the range contains multiple cells
'Convert the passed-in range to a Variant array for SPEED and bind the Collection
varArray = rng.Value
Set col = New Collection
'Ignore errors temporarily, as each attempt to add a repeat
'entry to the collection will cause an error
On Error Resume Next
'Loop through everything in the variant array, adding
'to the collection if it's not an empty string
For Each var In varArray
If CStr(var) <> vbNullString Then
col.Add Item:=CStr(var), Key:=CStr(var)
End If
Next var
On Error GoTo 0
End If
'Return the contains-uniques-only collection
Set CollectUniques = col
End Function
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