ring</a></span></td><td><span> the name of the property to be defined</span></td></tr><tr><td><span class="method-depth0"></span><code>descriptor</code></td><td><span><a href='https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Object'>Object</a></span></td><td><span> the descriptor for the property</span></td></tr><tr><td><span class="method-depth1"></span><code>configurable=false</code><span class="pull-right label label-optional">optional</span></td><td><span><a href='https://developer.m