Does a function in VBscript take variable number of arguments?

Question

For example, if I have a function in VBscript:

Function sum(a, b, c)
    sum = a + b + c
End function

Now, in the main, I make two variables and pass them into the function sum as the following:

Dim a : a = 1
Dim b : b = 2
Call sum(a, b)

Will this work or not, and why? Thanks.

Answer 1

It will not work, VBScript doesn't support optional arguments.
I'd use a function that takes an array of numbers instead vary number of arguments to getting sum.

Function sum(nums)
    Dim i, out
    For i = 0 To UBound(nums)
        out = out + nums(i)
    Next
    sum = out
End function

Call sum(Array(1, 2, 3, 4))

Answer 2

According to this, VBscript does not support optional arguments. You can do what they suggest and pass null values to your function.