What does 'ByVal" mean in VBSCript

Hi,
I have been learning a little ASP and VbScript. However one example in the book i am using refers to 'ByVal' in some code and does not really make any reference to it.

Below is the sample code. As you can see 'Byval' is inbetween the brackets where the variable declarations go. However nowhere is 'ByVal' referred to as a variable and as I understand it when there is more than one variable there should be a ','.

Anyway if anyone can explain this to me i would be extremely gratefull.


public Property Let CurrentSpeed(ByVal iSpeedIn)
internal_speed = iSpeedIn
End Property

Quote:

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Originally posted by Iain17
ByVal
Passes a copy of the variable to the sub / function. Thus the actual value of the variable is
placed on the stack. Any modification to the variable are local to this sub and are not
mirrored on the calling sub.

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The oppisite is ByRef. There you pass the reference to the variable, which means any local change will change the value of the variable in the calling scope.