What is the meaning of $.fn[abcd]
<p>I am working with some old code that I did not write, and need some help understanding it. </p>

<pre><code>(function() {
  var abc = "SORocks";
  $.fn[abc] = function (x) {
    doSomethingCool();
};

})(jQuery)
</code></pre>

<p>and elsewhere in the code are statements like
    ("#mydiv").SORocks(1234);</p>

<p>What does the [abc] do? Is it the same as $.fn.SORocks(x)?</p>
