protected Object sendJsCommand(String script, Object... args) {
    StringBuilder command = new StringBuilder();
    for(int i = 0; i < args.length; i++) {
      command.append(String.format("var $%d = arguments[%<d];", i));
    }
    command.append(script);
    JavascriptExecutor executor = (JavascriptExecutor) getWrappedDriver();
    return executor.executeScript(command.toString(), args);
  }