Choosing most liked post from facebook group

Well, here is the json file http://herbalista.hol.es/group.json i am working with JSON.parse(); on Google apps script. I temporarily solve with this code by Choosing the post which have more than 15 likes, but i want to choose the one with more likes independently if have or not more than 15 likes.

function repost() {
var UsrAccess_token = "xxxxxxxxx"
var graph = "https://graph.facebook.com/xxxxxx/feed/?access_token="+UsrAccess_token+"";
var jsondata = UrlFetchApp.fetch(graph,{method:"get"}).getContentText();
var object = JSON.parse(jsondata);
var item = object.data;
var currentTime = new Date();
var year = currentTime.getUTCFullYear();
var month = (currentTime.getUTCMonth()) + 1;
var day = (currentTime.getUTCDate()) - 1;
if (day <= 9) {var day = "0"+day+"";}
if (month <= 9) {var month = "0"+month+"";}
var utime = ""+year+"-"+month+"-"+day+"T";
try {
var i = null;
for (i = 0; item.length > i; i += 1) {
var pubDate = item[i].created_time;
if (pubDate.match(utime)) { var likesdata = item[i].likes.data; var len = likesdata.length;
                           if (len > 15) {var popular = item[i].link;}}


}} catch(err) {
   var err = "ERROR";
}
}

Answer

For this you can Choose a default value for a variable like var maxLikes = 0; and verify against len variable.

The code would be something like this:

function repost() {
var UsrAccess_token = "xxxxxxxxx"
var graph = "https://graph.facebook.com/xxxxxx/feed/?access_token="+UsrAccess_token+"";
var jsondata = UrlFetchApp.fetch(graph,{method:"get"}).getContentText();
var object = JSON.parse(jsondata);
var item = object.data;
var currentTime = new Date();
var year = currentTime.getUTCFullYear();
var month = (currentTime.getUTCMonth()) + 1;
var day = (currentTime.getUTCDate()) - 1;
if (day <= 9) {var day = "0"+day+"";}
if (month <= 9) {var month = "0"+month+"";}
var utime = ""+year+"-"+month+"-"+day+"T";
try {
  var i = null;
  var maxLikes = 0; 
  for (i = 0; item.length > i; i += 1) {
    var pubDate = item[i].created_time;
    if (pubDate.match(utime)) { 
      var likesdata = item[i].likes.data;
      var len = likesdata.length;
      if (len > maxLikes) {
        maxLikes = len;
        var popular = item[i].link;
      }
    }
  }
} catch(err) {
   var err = "ERROR";
}

}

Hope that helps!