' Merge two ArrayList, avoiding duplicate values (if there are already ' duplicate values in same input ArrayList however, they are not discarded)' ' Example:' Dim al1 As New ArrayList' al1.Add("John")' al1.Add("Ann")' al1.Add("Frank")'' Dim al2 As New ArrayList' al2.Add("Ann")' al2.Add("Tony")' al2.Add("Mark")' al2.Add("John")'' Dim al3 As ArrayList = ArrayListMerge(al1, al2)' Dim o As Object' Debug.WriteLine("Number of elements in the ArrayList returned from ' ArrayListMerge: " & al3.Count)' For Each o In al3' Debug.WriteLine(o)' NextFunction ArrayListMerge(ByVal al1 As ArrayList, ByVal al2 As ArrayList) As _ ArrayList ' initialize the capacity to the total count of elements from both array ' lists Dim res As New ArrayList(al1.Count + al2.Count) ' append the items in the first ArrayList res.AddRange(al1) Dim o As Object For Each o In al2 ' add all the al2's elements that are not contained in al1 If Not al1.Contains(o) Then res.Add(o) End If Next ' trim the ArrayList to the number of actually used slots res.TrimToSize() Return resEnd Function


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