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

The void operator seems to be the most common way to explicitly get undefined.

You would use it like this in your example:

myFunction(void 0, "abc");

It's also a reliable method for comparing against undefined that is guarded against undefined being accidentally overridden in older JavaScript environments:

var x;
if (x === void 0) {
    // this will execute
}