Lets say I have function with two arguments, the first being required and the second being optional:

function (req, opt) {}

Lets say that both arguments are expected when set to be an element, jquery obj, selector str, etc. Something jQuery can use.

In this function I might want to bind events to both of the passed in elements.

function (elem1 /*req*/, elem2 /* opt */) {

$([elem1, elem2]).bind('click', function () {

// do something...

});

}

Now this would work great as long as the optional element is not null. But when it is undefined, it the same as binding the event to the window.

$([elem, null /* which is the same as window */]).bind('click', function () {return false;});

I think null's in an array should be ignored, instead of being turned into the equivilent of $(window). Otherwise I have to expand out this sort of code into something less ideal. Such as:

function (elem1, elem2) {

var arr = [elem1];

if (elem2) arr.push(elem2);

$(arr).bind('click', function () {/* do something */});

}

Which isn't so bad, but was annoying.

PS. This code is an simplified example, of the problem I encountered due to this problem. In this example the simplest solution would have been to use arguments instead of making an array. But that would not have worked for my situation.