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Tip of the Day
Language: VB4,VB5,VB6,VBS
Expertise: beginner
Jul 10, 1999

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Use function name as a local variable

Many programmers don't realize that it is perfectly legal to use the name of a function inside the Function itself, as if it were a local variable. This trick often lets you avoid the declaration of a temporary variable, and sometimes can speed up the code. Take for example the following code:


Function Max(arr() As Long) As Long
    Dim res As Long, i As Long
    res = arr(LBound(arr))
    For i = LBound(arr) + 1 To UBound(arr)
        If arr(i) > res Then res = arr(i)
    Next
    Max = res
End Function
You can make it more concise by getting rid of the res variable:

Function Max(arr() As Long) As Long
    Dim i As Long
    Max = arr(LBound(arr))
    For i = LBound(arr) + 1 To UBound(arr)
        If arr(i) > Max Then Max = arr(i)
    Next
End Function
You can even pass the function name by reference to another routine, or as an argument of an API function.
Francesco Balena
 
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