Add jQuery function to specific elements

Question

I know that you can add new jQuery functions by $.fn.someFunction = function()

However, I want to add functions to specific elements only. I tried this

Answer 1

@Reigel's answer is great! However you could also use the $.fn syntax and let your function only handle certain elements:

$.fn.someFunction = function(){
    this.each(function(){
        // only handle "someElement"
        if (false == $(this).hasClass("someElement")) {
            return; // do nothing
        }

        $(this).append(" some element has been modified");

        return $(this); // support chaining
    });    
};

// now you can call your function like this
$('.someElement').someFunction();            

See working jsfiddle: http://jsfiddle.net/AKnKj/3/