title: Reading/writing nested data in a Firebase Database (web)
body: <p>This seemingly simple question is surely a duplicate of many, so I apologize for that. Won't be offended when it's marked as such... But I have yet to find a clear, straight forward and modern answer that seems to work as I'd expect.</p>
  
  <p><a href="https://i.stack.imgur.com/dQ9ih.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/dQ9ih.jpg" alt="enter image description here"></a></p>
  
  <p>Given "Item One", how can I return the "subItems" array for the object that matches that title?</p>
  
  <p>Additionally, how do I push new subitems to that array (if there's some different way I should target that array when writing rather than reading)</p>
  
  <p>And the context of this is "items" is the top-level <code>db.ref('items')</code></p>