HasDuplicateValues – Check if an array has duplicate values

' Returns True if an array contains duplicate values' it works with arrays of any typeFunction HasDuplicateValues(arr As Variant) As Boolean    Dim col As Collection, index As Long    Set col = New Collection        ' assume that the array contains duplicates    HasDuplicateValues = True        On Error GoTo FoundDuplicates    For index = LBound(arr) To UBound(arr)        ' build the key using the array element        ' an error occurs if the key already exists        col.Add 0, CStr(arr(index))    Next    ' if control comes here, the array doesn't contain    ' any duplicate values, so we can return zero    HasDuplicateValues = False    FoundDuplicates:End Function

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