title: How to retrieve the key in Firebase using Iterator
body: <p><a href="https://i.stack.imgur.com/oXnWo.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/oXnWo.png" alt="enter image description here"></a></p>
  
  <p>How to get the key in this json structure using Iterator?
  The logic would be, if the user is <strong>Harry Anderson</strong>, I want to search the value from <strong>person0</strong> up to <strong>person6</strong> and if the value is found i want to get its key which in this case is <strong>-KaSeO5n2xCl2sEnDpSi</strong>. I don't know if this will be achieved using Iterator, but if there are other ways to do this, please do suggest. Thanks.</p>