VBA - Remove both items from array when not unique - windows

Question

Quick question that I've been struggling with. I have 2 arrays of different lengths that contain strings.
I want to output a new array which removes BOTH the elements if a duplicate is detected. At the moment it only removes duplicates but leaves the original which is incorrect for what I am trying to accomplish.
E.g.
input = array ("cat","dog","mouse","cat")
expected output = array ("dog","mouse")
actual output = array ("cat","dog","mouse")
Code is below:
Sub removeDuplicates(CombinedArray)
Dim myCol As Collection
Dim idx As Long
Set myCol = New Collection
On Error Resume Next
For idx = LBound(CombinedArray) To UBound(CombinedArray)
myCol.Add 0, CStr(CombinedArray(idx))
If Err Then
CombinedArray(idx) = Empty
dups = dups + 1
Err.Clear
ElseIf dups Then
CombinedArray(idx - dups) = CombinedArray(idx)
CombinedArray(idx) = Empty
End If
Next
For idx = LBound(CombinedArray) To UBound(CombinedArray)
Debug.Print CombinedArray(idx)
Next
removeBlanks (CombinedArray)
End Sub
Thanks for all help and support in advance.

Answer 1

What about using Scripting.Dictionary? Like this:
Function RemoveDuplicates(ia() As Variant)
Dim c As Object
Set c = CreateObject("Scripting.Dictionary")
Dim v As Variant
For Each v In ia
If c.Exists(v) Then
c(v) = c(v) + 1
Else
c.Add v, 1
End If
Next
Dim out() As Variant
Dim nOut As Integer
nOut = 0
For Each v In ia
If c(v) = 1 Then
ReDim Preserve out(nOut) 'you will have to increment nOut first, if you have 1-based arrays
out(nOut) = v
nOut = nOut + 1
End If
Next
RemoveDuplicates = out
End Function

Answer 2

Here is a quick example. Let me know if you get any errors.
Sub Sample()
Dim inputAr(5) As String, outputAr() As String, temp As String
Dim n As Long, i As Long
inputAr(0) = "cat": inputAr(1) = "Hen": inputAr(2) = "mouse"
inputAr(3) = "cat": inputAr(4) = "dog": inputAr(5) = "Hen"
BubbleSort inputAr
For i = 1 To UBound(inputAr)
If inputAr(i) = inputAr(i - 1) Or inputAr(i) = temp Then
inputAr(i - 1) = "": temp = inputAr(i): inputAr(i) = ""
End If
Next i
n = 0
For i = 1 To UBound(inputAr)
If inputAr(i) <> "" Then
n = n + 1
ReDim Preserve outputAr(n)
outputAr(n) = inputAr(i)
End If
Next i
For i = 1 To UBound(outputAr)
Debug.Print outputAr(i)
Next i
End Sub
Sub BubbleSort(arr)
Dim value As Variant
Dim i As Long, a As Long, b As Long, c As Long
a = LBound(arr): b = UBound(arr)
Do
c = b - 1
b = 0
For i = a To c
value = arr(i)
If (value > arr(i + 1)) Xor False Then
arr(i) = arr(i + 1)
arr(i + 1) = value
b = i
End If
Next
Loop While b
End Sub
EDIT
Another way without sorting
Sub Sample()
Dim inputAr(5) As String, outputAr() As String
Dim n As Long, i As Long, j As Long
Dim RemOrg As Boolean
inputAr(0) = "cat": inputAr(1) = "Hen": inputAr(2) = "mouse"
inputAr(3) = "cat": inputAr(4) = "dog": inputAr(5) = "Hen"
For i = 0 To UBound(inputAr)
For j = 1 To UBound(inputAr)
If inputAr(i) = inputAr(j) Then
If i <> j Then
inputAr(j) = "": RemOrg = True
End If
End If
Next
If RemOrg = True Then
inputAr(i) = ""
RemOrg = False
End If
Next i
n = 0
For i = 0 To UBound(inputAr)
If inputAr(i) <> "" Then
n = n + 1
ReDim Preserve outputAr(n)
outputAr(n) = inputAr(i)
End If
Next i
For i = 1 To UBound(outputAr)
Debug.Print outputAr(i)
Next i
End Sub