gistfile1.txt

var _data = {}

if ((plot_id > 0) && (plot_id < 11)) {
      plot_number = "plot_" + plot_id;
    }
    
    if ((street_id !== null) && (plot_number !== null) && (plot_id !== null)) {

      adc_print("update plot " + plot_number);
      
      adc_print({valueOf(plot_number): user_id});
      _data[plot_number] = user_id; // This is a variable variable name. You have to use [] notation to do that.
      _data.status = "active";
      
      mystreet.update(
        { _id: street_id },
        {
          $set: _data
        }
      );