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    <p>If you only want the <code>addProduct</code> and <code>deleteProduct</code> methods to feature on that <em>single</em> jQuery object, then what you've got will work fine; but you'll have to keep a reference to that jQuery object/ only use it once, to preserve the existance of the <code>addProduct</code> and <code>deleteProduct</code> methods. </p> <p>However, these <code>addProduct</code> and <code>deleteProduct</code> methods are unique to that particular jQuery object; the methods won't exist on any other jQuery objects you create;</p> <pre><code>var productList = $.extend($('ul.products'), { addProduct: function(productData) { // add a new li item }, deleteProduct: function(productId) { // delete li with id } }); // Using this particular jQuery object (productList) will work fine. productList.addProduct(); productList.removeProduct(); // However, addProduct() does not exist on new jQuery objects, even if they use // the same selector. $('ul.products').addProduct(); // error; [object Object] has no method 'addProduct' </code></pre> <p>The best way do to this would be to go-back-to-basics and define separate <code>addProduct</code> and <code>deleteProduct</code> functions, which accept a jQuery object. If you wanted to restrict these functions to they only worked on the <code>ul.products</code> selector, you could do;</p> <pre><code>function addProduct(obj) { obj = obj.filter('ul.products'); // do something with `obj` (its a jQuery object) } </code></pre> <p>This approach would be recommended as it keeps the <code>jQuery.fn</code> API consistent; otherwise you'd be adding <code>addProduct</code> and <code>removeProduct</code> to <em>some</em> <code>jQuery.fn</code> instances but not others, or making their usage redundant in others. With this approach however <code>addProduct</code> and <code>removeProduct</code> are always there, but don't get in anyones way if they don't want to use them.</p> <hr> <h1>Historical Notes</h1> <p>This answer was originally written in November 2011, when jQuery 1.7 was released. Since then the API has changed considerably. The answer above is relevant to the <em>current</em> 2.0.0 version of jQuery.</p> <p>Prior to 1.9, a little used method called <a href="http://api.jquery.com/jQuery.sub/" rel="noreferrer"><code>jQuery.sub</code></a> used to exist, which is <em>related</em> to what you're trying to do (but won't help you unless you change your approach). This creates a new jQuery constructor, so you could do;</p> <pre><code>var newjQuery = jQuery.sub(); newjQuery.fn.addProduct = function () { // blah blah }; newjQuery.fn.deleteProduct = function () { // blah blah }; var foo = newjQuery('ul.products'); foo.deleteProduct(); foo.addProduct(); var bar = jQuery('ul.products'); bar.deleteProduct(); // error bar.addProduct(); // error </code></pre> <p>Be careful though, the <code>$</code> method alias would reference the old <code>jQuery</code> object, rather than the <code>newjQuery</code> instance. </p> <p><code>jQuery.sub</code> was removed from jQuery in 1.9. It is now available <a href="http://jquery.com/upgrade-guide/1.9/" rel="noreferrer">as a plugin</a>.</p>
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