code: public function get($name)
      {
          foreach ($this->arguments as $argument) {
              if ($argument['name'] == $name) {
                  if (isset($this->mapArgumentName[$name])) {
                      return $this->{$this->mapArgumentName[$name]}($argument);
                  } else {
                      return $argument;
                  }
              }
          }
      }
docs: Get argument by name.
  
  @param string $name
  
  @return null|array|bool