I love the any? and empty? convenience methods that Rails and Ruby provide, they make conditional statements much easier to read. I also really dislike the default method of checking this behavior in jQuery:

if ($('some.element').length > 0) {
  // ...do something
}

Well, luckily jQuery is ridiculously easy to extend, so why not just mix that functionality in with a couple of quick shot plugin methods? Just add this javascript sometime after you include jQuery: