Intersection of two arrays of ranges

Question

I currently have two arrays each of which contain ranges. How would you go about getting the intersection of these two arrays. In other words, I would like to get an array of ranges that only contains the ranges that are contained in both of the two original arrays. I tried .Intersect but that does not work on arrays as I learned.

array1: (Range("A1"),Range("B1"),Range("C1")) array2: (Range("A1"),Range("A2"), Range("A3"))

Result: (Range("A1"))

Answer 1

you can use this code. The idea is to merge your array in a single range using an iterative Union. Then you can use the built-in Intersect.

Function IntersectArray(array1() As Range, array2() As Range) As Range
    Dim unionRangeArray1 As Range, unionRangeArray2 As Range
    Dim i As Integer

    Dim lbound1 As Integer: lbound1 = LBound(array1)
    Dim lbound2 As Integer: lbound2 = LBound(array2)

    Set unionRangeArray1 = array1(lbound1)
    Set unionRangeArray2 = array2(lbound2)

    For i = lbound1 + 1 To UBound(array1)
        Set unionRangeArray1 = Application.Union(unionRangeArray1, array1(i))
    Next

    For i = lbound2 + 1 To UBound(array2)
        Set unionRangeArray2 = Application.Union(unionRangeArray2, array2(i))
    Next

    Set IntersectArray = Application.Intersect(unionRangeArray1, unionRangeArray2)
End Function