Although It's not necessarily noticeable how to augment a immediate member entry like foo.num = num, You can easily increase your regular setter with yet another drive parameter: Down below is an additional example on how @property will help when 1 has to refactor code and that is taken from https://smartworlddeveloper.co.in/smart-world-69-sector-69-gurgaon-a-new-benchmark-in-urban-luxury-living/