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    <p>For production code requiring a large compatibility with client browsers I still suggest Ivan Nevostruev's answer above with shim to ensure <code>Object.keys</code> in older browsers. However, it's possible to get the exact functionality requested using ECMA's new <code>defineProperty</code> feature.</p> <p><strong>As of ECMAScript 5 - Object.defineProperty</strong></p> <p>As of ECMA5 you can use <a href="https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Object/defineProperty" rel="nofollow noreferrer"><code>Object.defineProperty()</code></a> to define non-enumerable properties. The <a href="http://kangax.github.io/compat-table/es5/#test-Object.defineProperty" rel="nofollow noreferrer"><strong>current compatibility</strong></a> still has much to be desired, but this should eventually become usable in all browsers. (Specifically note the current incompatibility with IE8!)</p> <pre><code>Object.defineProperty(Object.prototype, 'keys', { value: function keys() { var keys = []; for(var i in this) if (this.hasOwnProperty(i)) { keys.push(i); } return keys; }, enumerable: false }); var o = { 'a': 1, 'b': 2 } for (var k in o) { console.log(k, o[k]) } console.log(o.keys()) # OUTPUT # &gt; a 1 # &gt; b 2 # &gt; ["a", "b"] </code></pre> <p>However, since ECMA5 already added <code>Object.keys</code> you might as well use:</p> <pre><code>Object.defineProperty(Object.prototype, 'keys', { value: function keys() { return Object.keys(this); }, enumerable: false }); </code></pre> <p><strong>Original answer</strong></p> <pre><code>Object.prototype.keys = function () { var keys = []; for(var i in this) if (this.hasOwnProperty(i)) { keys.push(i); } return keys; } </code></pre> <hr> <p><strong>Edit:</strong> Since this answer has been around for a while I'll leave the above untouched. Anyone reading this should also read Ivan Nevostruev's answer below.</p> <p>There's no way of making prototype functions non-enumerable which leads to them always turning up in for-in loops that don't use <code>hasOwnProperty</code>. I still think this answer would be ideal if extending the prototype of Object wasn't so messy.</p>
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    1. POHow to find keys of a hash?
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    1. CO'hasOwnProperty' excludes properties on the prototypes of this object, which is useful to know.
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    2. COAnswer accepted because that's how I ended up implementing it but I feel this should have been a built-in function of the language.
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    3. CONote that you should use "for (var i in this)..." to avoid creating a global variable.
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