title: how to loop through urls in a firebase firestore set function?
body: <p>The code below is looped for let's say, 7 times. I am using firebase setting documents btw. If I want a document that recieves multiple fields, so like url1, url2 => url7, how can I do this? I've tried url[i], url{i} where i is the index being looped.</p>
  
  <pre><code>db.doc().set({
     url: downloadURL
  }){ merge: true });
  </code></pre>