code: function transformHashData(stream, item) {
      var vals = [], row = [], headers = stream.headers, i = -1, headersLength = stream.headersLength;
      if (stream.totalCount++) {
          row.push(stream.rowDelimiter);
      }
      while (++i < headersLength) {
          vals[i] = item[headers[i]];
      }
      row.push(stream.formatter(vals));
      return row.join("");
  }
docs: transform an object into a CSV row