title: Retrieve object based on its array position in Firebase
body: <p>I'm using Firebase for a project and need to return an object based on its array position. </p>
  
  <p>In the documentation, I've found explanations for returning and listing the full array of objects, child properties found within parent objects, etc, but nothing for returning objects by position in their parent array. </p>
  
  <p>In other words, if I have a Firebase array of dinos:</p>
  
  <pre><code>"dinos" :
      {
        "lambeosaurus": {
          "height" : 2.1,
          "length" : 12.5,
          "weight": 5000
        },
        "stegosaurus": {
          "height" : 4,
          "length" : 9,
          "weight" : 2500
        }
      }
  </code></pre>
  
  <p>is there a way for me to return the object stored at dinos[1]? </p>