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    <hr> <pre><code>(function( $ ){ })( jQuery ); </code></pre> <p>That is self-executing anonymous function that uses <code>$</code> in argument so that you can use it (<code>$</code>) instead of <code>jQuery</code> inside that function and without the fear of conflicting with other libraries because in other libraries too <code>$</code> has special meaning. That pattern is especially useful when writing jQuery plugins.</p> <p>You can write any character there instead of <code>$</code> too:</p> <pre><code>(function(j){ // can do something like j.fn.function_name = function(x){}; })(jQuery); </code></pre> <p>Here <code>j</code> will automatically catch up jQuery specified at the end <code>(jQuery)</code>. Or you can leave out the argument completely but then you will have to use <code>jQuery</code> keyword all around instead of <code>$</code> with no fear of collision still. So <code>$</code> is wrapped in the argument for short-hand so that you can write <code>$</code> instead of <code>jQuery</code> all around inside that function.</p> <p>If you even look at the source code of jQuery, you will see that everything is wrapped in between:</p> <pre><code>(function( window, undefined ) { // jQuery code })(window); </code></pre> <p>That is as can be seen also a self-executing anonymous function with arguments. A <code>window</code> (and <code>undefined</code>) argument is created and is mapped with global <code>window</code> object at the bottom <code>(window)</code>. This is popular pattern these days and has little speed gain because here <code>window</code> is will be looked into from the argument rather than global <code>window</code> object which is mapped below.</p> <hr> <p>The <code>$.fn</code> is jQuery's object where you create your new function (which is also an object) or the plugin itself so that jQuery wraps your plugin in its <code>$.fn</code> object and make it available.</p> <hr> <p>Interestingly, I had answered similar question here:</p> <p><a href="https://stackoverflow.com/questions/4472528/javascript-jquery-closure-function-syntax">JavaScript / jQuery closure function syntax</a></p> <p>You can also check out this article to know more about self-executing functions that I had written:</p> <p><a href="http://webupon.com/audio/javascript-self-executing-functions/" rel="nofollow noreferrer">Javascript Self-executing Functions</a></p>
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    1. POI'd like to understand the jQuery plugin syntax
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    1. COSo if I had an object called my_object, and did this: (function(mo){mo.doSomething()})(my_object), then it would run my_object.doSomething()?
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    2. CO@Ethan yes, it would
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