code: public function parameterByName($name)
      {
          $this->typeCheck->parameterByName(func_get_args());
  
          foreach ($this->parameters() as $parameter) {
              if ($parameter->name() === $name) {
                  return $parameter;
              }
          }
  
          return null;
      }
docs: @param string $name
  
  @return Parameter|null