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Tip of the Day
Language: VB4,VB5,VB6,VBS
Expertise: beginner
Nov 20, 1999

WEBINAR:

On-Demand

Application Security Testing: An Integral Part of DevOps


ArrayShuffle - Randomize the order of elements in an array

' Shuffle the elements of an array of any type
' (it doesn't work with arrays of objects or UDT)

Sub ArrayShuffle(arr As Variant)
    Dim index As Long
    Dim newIndex As Long
    Dim firstIndex As Long
    Dim itemCount As Long
    Dim tmpValue As Variant
    
    firstIndex = LBound(arr)
    itemCount = UBound(arr) - LBound(arr) + 1
    
    For index = UBound(arr) To LBound(arr) + 1 Step -1
        ' evaluate a random index from LBound to INDEX
        newIndex = firstIndex + Int(Rnd * itemCount)
        ' swap the two items
        tmpValue = arr(index)
        arr(index) = arr(newIndex)
        arr(newIndex) = tmpValue
        ' prepare for next iteration
        itemCount = itemCount - 1
    Next

End Sub
Francesco Balena
 
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