title: Slice specific keys in javascript object
body: <p>In rails, i have a special <code>slice</code> <a href="http://apidock.com/rails/Hash/slice" rel="noreferrer">method</a> to keep in <code>Hash</code> only keys I need. It is very handy to permit only required keys in a hash.</p>
  
  <p>Is there a method like this in <strong>Node.js</strong>?</p>