title: How do JavaScript versions correlate to ECMAScript versions?
body: <p>For example, <a href="https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/map" rel="nofollow noreferrer">[].map</a> was "implemented in JavaScript 1.6." Is that an ES5 method? How does the 1.6 correlate to an <a href="http://en.wikipedia.org/wiki/ECMAScript" rel="nofollow noreferrer">ECMAScript</a> version?</p>