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copied!<p>In ECMAScript 5 you have new approach in iteration fields of literal - <code>Object.keys</code></p> <p>More information you can see on <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/keys" rel="noreferrer">MDN</a></p> <p>My choice is below as a faster solution in current versions of browsers (Chrome30, IE10, FF25)</p> <pre><code>var keys = Object.keys(p), len = keys.length, i = 0, prop, value; while (i < len) { prop = keys[i]; value = p[prop]; i += 1; } </code></pre> <p>You can compare performance of this approach with different implementations on <a href="http://jsperf.com/" rel="noreferrer">jsperf.com</a>:</p> <ul> <li><a href="http://jsperf.com/extendimplementations/2" rel="noreferrer">Extend Implementations</a></li> <li><a href="http://jsperf.com/object-keys-iteration/30" rel="noreferrer">Object keys iteration</a></li> <li><a href="http://jsperf.com/object-literal-iteration/5" rel="noreferrer">object literal iteration</a></li> </ul> <p>Browser support you can see on <a href="http://kangax.github.io/es5-compat-table/#Object.keys" rel="noreferrer">Kangax's compat table</a></p> <p>For old browser you have <a href="http://tokenposts.blogspot.com.au/2012/04/javascript-objectkeys-browser.html" rel="noreferrer">simple</a> and <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/keys" rel="noreferrer">full</a> polyfill</p> <p><strong>UPD:</strong></p> <p>performance comparison for all most popular cases in this question on <code>perfjs.info</code>:</p> <p><a href="http://perfjs.info/#!/384A61CA-DA2E-4FD2-A113-080010D4A42B" rel="noreferrer">object literal iteration</a></p>

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