ByVal vs ByRef VBA

Question

I\'ve tried to attempt something that was answered by JaredPar ByRef vs ByVal Clarification

ByVal in VB.NET means that a copy of the provided

Answer 1

I would do it this way.

Sub test1()

    Dim trythis As Boolean

    trythis = False

    If (Sheets("TESTING").Range("A1").value = 1) Then
        tr = testingRoutine(trythis)
        If tr Then
            Debug.Print "Value changed to 0"
            Sheets("TESTING").Range("A1").value = 0
        End If
    End If

End Sub

Private Function testingRoutine(ByRef trythis As Boolean)

    Debug.Print "Ran Function"
    testingRoutine = True

End Function

Because trythis is not a global variable, changing it in the function will do nothing in the sub. It will just define trythis as True in the function and stay in that scope. To get trythis to be affected by the function and read by the sub you have to assign it to a variable within the sub.