title: Syntax error using => in IE
body: <p>I have the following line of javascript code</p>
  
  <pre><code>var res = Object.keys(packages).filter(e =&gt; packages[e] === true)
  </code></pre>
  
  <p>The above works well in all the other browser apart from IE. IE complains about Syntax erro at <code>=&gt;</code> can someone tell me how to get around this in IE </p>