script.js

var sortedByVoteCount;
var oReq = new XMLHttpRequest();

function reqListener () {
  sortedByVoteCount = JSON.parse(JSON.stringify(oReq.response))
  .posts.sort(function (a, b) {
    if(a.vote_count < b.vote_count) return -1;
    if(a.vote_count > b.vote_count) return 1;
    return 0;
  });
}

oReq.addEventListener("load", reqListener);
oReq.open("GET", "https://hafven.zendesk.com/api/v2/community/topics/200364775/posts.json");
oReq.send();