find() matches elements which are descendants of those in the jQuery object and filter() reduces the set of elements in the jQuery object to those which match the selector. What I would like to use is a function which combines both of these to return the same as:

jQueryObject.filter(selector).add(jQueryObject.find(selector))

Use Case

Currently, I have a method which I run to initialize my content on DOM ready and on receiving/creating new content. For example:

var myInitFunction = function($content){
    // $content is a jQuery object.  Do some init on content here, eg:
    $content.filter('div.clickable').add($content.find('div.clickable')).css('cursor', 'pointer').click(function(){
        // handle click
    });
};

// content needs to be initialized on load, so:
$(document).ready(function(){
    myInitFunction($('body'));
});

/* ...
 *
 * Occasionally, this page receives content via AJAX which 
 * also needs to be initialized, e.g.:
 */

$.get({
    success: function(data) {
       // add data to the DOM here
       // then the new content needs to be initialized, too, so:
       myInitFunction($(data));
    }
});

As the DOM nodes which need to be initialized could either be directly in the jQuery object, or descendants of the nodes therein, $content.filter(selector).add($content.find(selector)) needs to be used to get them all.