jQuery plugin, function that operates on each jQuery object then executes final statement

Is it possible to write a jQuery plug-in that operates on each item in a jQuery object using this syntax:

(function ($){
 $.fn.extend({
  DoSomething: function(){ 
   return this.each(function () {
    //Do something to each item
   });
   //Run the general update
   update();
  }
 });
})(jQuery);

But then I want to finish the function call with a general "update" operation.

How would I go about doing something like this? it will be quite slow if I do the update af开发者_JS百科ter each operation, rather than at the end, but I'll be putting this code in a few places, so I was hoping not to separate this out into two calls: $(object).DoSomething().update();

Might not be what you are after, but:

(function ($){
 $.fn.extend({
  DoSomething: function(){ 
   this.each(function () {
    //Do something to each item
   });
   //Run the general update
   update();
   return this;
  }
 });
})(jQuery);

Will execute your this.each() functionality and then your update() function.

Would something like this work?

$.fn.extend({
  doSomething: function (eachProcess, whenDone) {
    var result = this.each(eachProcess);
    whenDone();
    return result;
  }
});

So you'd pass in the function to call for each item (eachProcess) and for completion (whenDone).