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function request(url, callback) {
    var xhr = new XMLHttpRequest();
    xhr.open('GET', url, true);
    xhr.responseType = 'json';
    xhr.onload = callback;
    xhr.send();
  }
  

// demo
function getTopStories(callback) {
    request(HN_TOPSTORIES_URL, function(evt) {
      callback(evt.target.response);
    });
  }