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    <p>The <code>$()</code> method is not part of the JavaScript language. It is often defined in JavaScript frameworks such as <a href="http://jquery.com" rel="nofollow noreferrer">jQuery</a> and <a href="http://www.prototypejs.org/" rel="nofollow noreferrer">Prototype</a>, as a <a href="http://en.wikipedia.org/wiki/Document_Object_Model" rel="nofollow noreferrer">DOM</a> selector.</p> <p>It is interesting to note that up to until December 2009, the <a href="http://en.wikipedia.org/wiki/ECMAScript" rel="nofollow noreferrer">ECMAScript</a> specification used to state:</p> <blockquote> <p>The dollar sign ($) and the underscore (_) are permitted anywhere in an identifier. <strong>The dollar sign is intended for use only in mechanically generated code.</strong> (<a href="https://stackoverflow.com/questions/205853/why-would-a-javascript-variable-start-with-a-dollar-sign/205974#205974">Source</a>)</p> </blockquote> <p>However this "<em>dollar sign for mechanically generated code</em>" hint was removed from the <a href="http://www.ecma-international.org/publications/files/ECMA-ST/ECMA-262.pdf" rel="nofollow noreferrer">current ECMAScript specification</a> (ECMA 262 - 5th Edition / December 2009).</p> <hr> <p>Nevertheless, the original question was probably referring to the popular DOM selectors in jQuery, Prototype, et al. Here are a few jQuery examples:</p> <pre><code>$('*'); /* This selector is a wild card method and will select all elements in a document. */ $('#id'); /* This selector selects an element with the given ID. */ $('.class'); /* The class selector will gather all elements in the document with the given class name. */ $('element'); /* This selector will collect all elements in a document with the given tag name i.e. table, ul, li, a etc. */ </code></pre> <p>You may want to check the following article for more examples:</p> <ul> <li><a href="http://www.pamaya.com/jquery-selectors-and-attribute-selectors-reference-and-examples/" rel="nofollow noreferrer">jQuery selectors and examples</a></li> </ul>
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    1. USDaniel Vassallo
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