Iterating through a range until you find different value in VBA - vba

Question

I'm trying to create a VBA function that starts from the bottom of a range, and returns the first value that's different from the value at the bottom.
Example:
In the above table, I'd like to be able to grab the last value in the "Month" column (11), and iterate to the top until the value 10 is reached, and return that value.
I just started looking into VBA 3 days ago and am very unfamiliar with the language so I'm still trying to grok the syntax.
I have no doubt that my thinking is fuzzy with this, so I'd really appreciate feedback on my errors.
Here's what I have right now:
Code:
Function NextValue(num1 As Range)
For c = num1.End(xlDown) To num1.Item(1)
If Cells(c, 1) <> num1.End(xlDown) Then
NextValue = Cells(c, 1)
Exit For
End If
Next c
End Function
In case it's not clear, here's a description of what I'm trying to do, line-by-line.
1). Initiate a For-Loop that begins at the end of a range and decrements to the top
2). Check if that cell does not match the last value in that column
3). If it does not, then set the value of the function to that value
4). Terminate If statements, For loops, and end the function.
Your help is greatly appreciated.

Answer 1

Try this:
Function NextValue(num1 As Range) as Integer
Dim y As Integer
'get the last cell from num1
Set num1 = num1.End(xlDown)
y = -1
Do Until num1.Offset(y, 0).Value <> num1.Value
y = y - 1
Loop
'set function return to the different cell
NextValue = num1.Offset(y, 0).value
End Function

Answer 2

This will handle both compact ranges and disjoint ranges:
Option Explicit
Public Function SomethingElse(rng As Range) As Variant
Dim r As Range, values() As Variant
Dim i As Long, strvalue As Variant
ReDim values(1 To rng.Count)
i = 1
For Each r In rng
values(i) = r.Value
i = i + 1
Next r
strvalue = values(rng.Count)
For i = rng.Count To 1 Step -1
If values(i) <> strvalue Then
SomethingElse = values(i)
Exit Function
End If
Next i
SomethingElse = CVErr(xlErrNA)
End Function

Answer 3

Not clear to me if you want an UDF or a code to be used in a macro
in the first case you've already been given answers
in the latter case you may want to consider these two options:
Public Function FirstDifferent(rng As Range) As Variant
With rng.Parent.UsedRange
With Intersect(.Resize(, 1).Offset(, .Columns.Count), rng.EntireRow)
.Value = rng.Value
.RemoveDuplicates Array(1)
FirstDifferent = .Cells(.Rows.Count, 1).End(xlUp).Offset(-1).Value
If FirstDifferent = .Cells(.Rows.Count, 1) Then FirstDifferent = "#N/A"
.ClearContents
End With
End With
End Function
Public Function FirstDifferent(rng As Range) As Variant
With rng.Resize(, 1)
.AutoFilter Field:=1, Criteria1:=.Cells(.Rows.Count, 1)
FirstDifferent = .Offset(1).Resize(.Rows.Count - 1).SpecialCells(xlCellTypeVisible).Cells(1, 1).Offset(-1).Value ' = 0 '<-- if any rows filtered other than headers one then change their column "B" value to zero
If FirstDifferent = .Cells(.Rows.Count, 1) Then FirstDifferent = "#N/A"
.Parent.AutoFilterMode = False
End With
End Function