What real purpose does $.noop() serve in jQuery 1.4?

Question

Pouring over the release notes regarding jQuery 1.4, I came acrosss $.noop() which is:

Description: An empty function. (added in 1.4)

Answer 1

Real World Example (well almost):

jQuery.fn.myAwesomeAjax = function(url, complete) {
  return jQuery.ajax(url || this.url)
    .complete(complete || jQuery.noop);
};

Use it instead of function (){}