https://medium.com/@kaikersu.zorori/primitive-type-%E0%B8%81%E0%B8%B1%E0%B8%9A-reference-type-%E0%B8%84%E0%B8%B7%E0%B8%AD%E0%B8%AD%E0%B8%B0%E0%B9%84%E0%B8%A3-7f2c8947fcf3
