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

A better approach might be passing Object with named attributes and then look for those specific attribute values. This way you don't have to be dependent on number of arguments.
Example: Object.dummy