title: Getting the size of an array in an object
body: <p>I would like some help with getting the size of an array inside an object: </p>
  
  <pre><code>var st = { "itema":{...},"itemb":[{"id":"s01","cd":"c01","dd":"d01",....}{"id":"s02","cd":"c02","dd":"d02",....}]}
  </code></pre>
  
  <p>How would you get a count of the objects inside <code>"itemb"</code> (in this case 2)?</p>