Optional Argument in Sub or Function

[#1]

Using QV10 SR3.  Can you create a Function or Sub with an optional argument?  For example, can I create a Function like:

Function AddEmUp (a, b, optional c)

  AddEmUp = a + b + c

End Function

Here, the argument c is optional...so it works if I pass it two or three arguments.

[swuehl]

You can create a function variable (dollar sign expansion with arguments), e.g.

Define in the script:

Set vDateDiff = if(len($2)=0, today(), $2) - $1;

Then you can call vDateDiff with one or two arguments (second argument defaults to today()):

=$(vDateDiff('1/1/2012'))

=$(vDateDiff('1/1/2012','2/1/2012'))

[IAMDV]

Also, please read this post :

http://qlikviewmaven.blogspot.co.uk/2011/04/variable-that-acts-like-user-defined.html

Thanks,

DV