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POWhy does this JavaScript prototype function break jQuery?
 

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    <p>Question:</p> <p>As soon as I add the below code to my html page, I get:</p> <pre><code>Line: 4 Error: Object doesn't support the property or method "exec". </code></pre> <p>This is the prototype that causes the bug:</p> <pre><code> Object.prototype.allKeys = function () { var keys = []; for (var key in this) { // Very important to check for dictionary.hasOwnProperty(key) // otherwise you may end up with methods from the prototype chain.. if (this.hasOwnProperty(key)) { keys.push(key); //alert(key); } // End if (dict.hasOwnProperty(key)) } // Next key keys.sort(); return keys; }; // End Extension Function allKeys </code></pre> <p>And this is the minimum code required to reproduce the error (Browser in question: IE9):</p> <pre><code>&lt;!DOCTYPE html&gt; &lt;html&gt; &lt;head&gt; &lt;title&gt;TestPage&lt;/title&gt; &lt;script type="text/javascript" src="jquery-1.9.1.min.js"&gt;&lt;/script&gt; &lt;script type="text/javascript"&gt; /* Object.prototype.getName111 = function () { var funcNameRegex = /function (.{1,})\(/; var results = (funcNameRegex).exec((this).constructor.toString()); return (results &amp;&amp; results.length &gt; 1) ? results[1] : ""; }; // End Function getName */ Object.prototype.allKeys = function () { var keys = []; for (var key in this) { // Very important to check for dictionary.hasOwnProperty(key) // otherwise you may end up with methods from the prototype chain.. if (this.hasOwnProperty(key)) { keys.push(key); //alert(key); } // End if (dict.hasOwnProperty(key)) } // Next key keys.sort(); return keys; }; // End Extension Function allKeys &lt;/script&gt; &lt;/head&gt; &lt;body&gt; &lt;select id="selLayers" name="myddl"&gt; &lt;option value="1"&gt;One&lt;/option&gt; &lt;option value="2"&gt;Twooo&lt;/option&gt; &lt;option value="3"&gt;Three&lt;/option&gt; &lt;option value="4"&gt;Text1&lt;/option&gt; &lt;option value="5"&gt;Text2&lt;/option&gt; &lt;/select&gt; &lt;script type="text/javascript"&gt; //var dict = { "de": { "Text1": "Ersetzung 1", "Text2": "Ersetzung 2" }, "fr": { "Text1": "Replacement 1", "Text2": "Réplacement 2" }, "it": { "Text1": "Replacemente 1", "Text2": "Replacemente 2" }, "en": { "Text1": "Replacement 1", "Text2": "Replacement 2"} }; /* var languages = dict.allKeys(); for (var j = 0; j &lt; languages.length; ++j) { var strCurrentLanguage = languages[j]; var dictReplacements = dict[strCurrentLanguage] var keys = dictReplacements.allKeys(); //alert(JSON.stringify(dictReplacements)); //alert(JSON.stringify(keys)); for (var i = 0; i &lt; keys.length; ++i) { var strKey = keys[i]; var strReplacement = dictReplacements[strKey]; alert(strKey + " ==&gt; " + strReplacement); //alert('#selLayers option:contains("' + strKey + '")'); //$('#selLayers option:contains("' + strKey + '")').html(strReplacement); //$('#selLayers option:contains("Text1")').html("foobar"); } } */ $('#selLayers option:contains("Twooo")').text('Fish'); //alert(dict.allKeys()); //alert(dict["de"]["abc"]); /* $('#selLayers option[value=2]').text('Fish'); $('#selLayers option:contains("Twooo")').text('Fish'); $('#selLayers option:contains("Twooo")').html('&amp;Eacute;tage'); // http://stackoverflow.com/questions/7344220/jquery-selector-contains-to-equals $("#list option[value=2]").text(); $("#list option:selected").each(function () { alert($(this).text()); }); $("#list").change(function() { alert($(this).find("option:selected").text()+' clicked!'); }); */ &lt;/script&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p>I tried renaming the prototype function, just in case it conflicts with any jquery prototype, but that doesn't help at all.</p>
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    1. COPossible dupe http://stackoverflow.com/questions/1827458/prototyping-object-in-javascript-breaks-jquery
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    2. COYour question has been sufficiently answered. Feel free to accept one of the answers :)
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