javascript Firebase database get values groupped

I need these values in a row but i dont want them reply if its already in div

o my try is here, o try to build a array and put these values from firebase to here but still i cant see in html

////////////////////////////////////////////////////////////////////////////////////
  var fruits = [];
  var fetchPostsleft = function(postsRef, sectionElement,fruits) {
    postsRef .orderByChild('timeStamp').on('child_added', function(data) {
        console.log(data.val());
      var author = data.val().senderName;


        var containerElement2 = sectionElement.getElementsByClassName('posts-containerleft')[0];

        fruits.push(data.val().senderName);  
        console.log(fruits.length);


   });

  };


    fetchPostsleft(topUserPostsRef, topUserPostsSectionleft,fruits);
var fLen = fruits.length;
        console.log(fruits.length);

for (var i = 0; i < fLen; i++) {
   // text += "<li>" + fruits[i] + "</li>";
   topUserPostsSectionleft.getElementsByClassName('posts-containerleft')[0].insertBefore( createheaders(fruits[i], ""),
   topUserPostsSectionleft.getElementsByClassName('posts-containerleft')[0].firstChild);
}