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Tip of the Day
Language: VB5
Expertise: Intermediate
Apr 1, 2000



Building the Right Environment to Support AI, Machine Learning and Deep Learning

Filter - A replacement for VB6's Filter function under VB5

' A replace for the Filter function under VB4 and VB5
' Note that the source array is modified. For this reason
' this is declared as a Sub rather than a Function

Sub Filter(arr() As String, ByVal Search As String, Optional ByVal Include As _
    Boolean, Optional ByVal CompareMethod As VbCompareMethod = vbBinaryCompare)
    Dim index As Long
    Dim count As Long
    count = LBound(arr) - 1
    For index = LBound(arr) To UBound(arr)
        If (InStr(1, arr(index), Search, CompareMethod) > 0) = Include Then
            ' this item must be included
            count = count + 1
            If index <> count Then
                ' copy data only if necessary
                arr(count) = arr(index)
            End If
        End If
    ' trim items in excess
    If count < UBound(arr) Then
        ReDim Preserve arr(LBound(arr) To count) As String
    End If
End Sub
Francesco Balena
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