VBA Comparing two excel rows and deleting similar cells - vba

Question

I am trying to make an excel code that will compare the used range of Rows 1 and 2 of the same worksheet and delete any similar cells and move the remaining (unique values) cells to Row 1 beginning at A1.
eg) If row 1 contains these values (commas inidicate diff cells): a, b, c
and row 2 contains: a, b, c, d, e
I want the code to compare the two rows and end up with row 1 being: d, e (in columns A and B), after the code is complete. Any help would be appreciated.
Im new to VBA so im having trouble on some syntax that I would appreciate if some pros could help me out.
Get the used number of columns for rows 1 and 2 as integers. eg) maxCol1 = 3, maxCol2 = 5
Create a for loop that goes from i = 1 To maxCol2 and compares row 1 to row 2. if they are equal, make them both "", if there is something in row 2 but not in row 1, set that value to cell A1.
basically just need help on setting step 1 up.

Answer 1

With the help of the link posted in the comment, I figured it out! Thanks to those who helped. The code compares row 2 from row 1 and deletes any similar cell values and posts the unique values into row 1 and also into a new worksheet.
Sub CompareAndDelete()
'This code will compare the rows of each sheet and delete any old alerts that have already been emailed out
' it will then call SaveFile IF new alerts have been found
Dim row1() As Variant, row2() As Variant, newRow As Variant
Dim coll As Collection
Dim i As Long
Dim maxCol1 As Integer
Dim maxCol2 As Integer
'Find max number of columns for old and new alert
With ActiveSheet
maxCol1 = .Cells(1, .Columns.Count).End(xlToLeft).Column
maxCol2 = .Cells(2, .Columns.Count).End(xlToLeft).Column
End With
'Redimensionalize arrays
ReDim row1(0 To (maxCol1 - 1))
ReDim row2(0 To (maxCol2 - 1))
'Assign row1/row2 string values into arrays
For r = 0 To (maxCol1 - 1)
row1(r) = Cells(1, r + 1).Value
Next
For s = 0 To (maxCol2 - 1)
row2(s) = Cells(2, s + 1).Value
Next
ReDim newRow(LBound(row1) To Abs(UBound(row2) - UBound(row1)) - 1)
'Create a collection to load all row1/row2 values into
Set coll = New Collection
'Empty Collection for each run through
Set coll = Nothing
'Set collection to New before using
Set coll = New Collection
For i = LBound(row1) To (UBound(row1))
coll.Add row1(i), row1(i)
Next i
For i = LBound(row2) To (UBound(row2))
On Error Resume Next
coll.Add row2(i), row2(i)
If Err.Number <> 0 Then
coll.Remove row2(i)
End If
On Error GoTo 0
Next i
'Copy Row 2 and Paste it to Row 1
ActiveWorkbook.ActiveSheet.Rows(2).Copy
Range("A1").Select
ActiveSheet.Paste
'Now values are stored in collection, delete row 2
'Rows(2).EntireRow.ClearContents
'Paste only the new alerts onto a new worksheet that is designated for new alerts
For i = LBound(newRow) To UBound(newRow)
newRow(i) = coll(i + 1) 'Collections are 1-based
'Debug.Print newRow(i)
ActiveWorkbook.Sheets("Sheet" & index + 4).Select
ActiveWorkbook.Sheets("Sheet" & index + 4).Cells(1, i + 1).Value = newRow(i)
Next i
'if NEW alerts have been found, call SaveFile
If IsEmpty(ActiveWorkbook.Sheets("Sheet" & index + 4).Cells(1, 1)) = False Then
Call SaveFile
End If
End Sub
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