How to pass the value 'undefined' to a function with multiple parameters?

Question

I want to pass the value of \'undefined\' on a multiple parameter function but without omitting the parameter.

What do I mean with \"without omitting the paramet

Answer 1

I just had an idea and it seems to work:

var undf;

myFunction(undf, "abc");

I am sure there are better ways, however I post this