title: How can I find the keys of an object?
body: <p>I know in JavaScript, <em>objects</em> double as hashes, but I have been unable to find a built-in function to get the keys:</p>
  <pre><code>var h = {a:'b', c:'d'};
  </code></pre>
  <p>I want something like</p>
  <pre><code>var k = h.keys() ; // k = ['a', 'c'];
  </code></pre>
  <p>It is simple to write a function myself to iterate over the items and add the keys to an array that I return, but is there a standard cleaner way to do that?</p>
  <p>I keep feeling it must be a simple built in function that I missed but I can't find it!</p>