title: Polyfill or workarounds for ECMAScript5 new features?
body: <p>I want to write my JS code with the new <a href="http://kangax.github.com/es5-compat-table/" rel="noreferrer">ECMAScript5 features</a> that working today and in the future. </p>
  
  <p>As not all browsers support all the features (especially IE) such as <code>Object.create</code>, <code>Array.isArray</code> or <code>JSON</code>. </p>
  
  <p>I knew a few workarounds such as use <code>json2.js</code> to archieve <code>JSON</code> support. I want to know more polyfills or workarounds for the other feature.</p>