function clean_data(obj) {
    for (var key in obj) {
        // Delete null, undefined, "", " "
        if (obj[key] === null || obj[key] === undefined || obj[key] === "" || obj[key] === " ") {
            delete obj[key];
        }
        // Delete empty object
        // Note : typeof Array is also object
        if (typeof obj[key] === 'object' && Object.keys(obj[key]).length <= 0) {
            delete obj[key];
        }
        // If non empty object call function again
        if(typeof obj[key] === 'object'){
            clean_data(obj[key]);
        }
    }
    return obj;
};

function getPrice(itemId,apiKey) {
  var selections = ['itemmarket', 'bazaar'];
  var url = 'https://api.torn.com/market/'+ itemId+ '?selections=' + selections.join(',') + '&key='+ apiKey;
  var options = {
   'method' : 'post',
   'contentType': 'application/json',
   'muteHttpExceptions': true
  };
  var res = UrlFetchApp.fetch(url, options);
  var data = JSON.parse(res.getContentText());
  var values = [];

  for (y = 0; y < selections.length; ++y) {
    if(!data[selections[y]]) {clean_data(data[selections[y]]);}
    else {
      var entries = data[selections[y]];
      var ids = Object.keys(entries);

      for(i = 0; i < 1; i++) {
          values.push(entries[ids[i]].cost);
      }
    }
  }

  if (values.length > 0) {
    return Math.min.apply(null, values);
  }
};