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Tip of the Day
Language: Visual Basic
Expertise: Advanced
Jul 30, 1997



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

More Versatile Array Parameters

You can write a single procedure that accepts any type of array as an argument by using a variant parameter. Within the procedure, address the array using the usual syntax:
' return the number of items
Function ItemCount(anArray As Variant) _
        As Long
ItemCount = UBound(anArray) - _
        LBound(anArray) + 1
' the first element is 
' anArray(LBound(anArray))
End Function
You can even pass a matrix with any number of dimensions; in order to understand how many dimensions, you must iterate on the UBound or LBound functions until an error occurs:
Function ItemCount(anArray As Variant) _

        As Long
Dim items As Long, i As Integer
On Error Resume Next
items = UBound(anArray) - _
        LBound(anArray) + 1
For i = 2 to 999
        items = items * (UBound(anArray, _
                i) - LBound(anArray, i) + 1)
        If Err Then Exit For
ItemCount = items
End Function
Francesco Balena
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