SubType of any other Types (extends all other types) • In opposite, Any is Super class of any other class (World without Null) (World with Null) Image Reference: https://medium.com/@m.sandovalcalvo/kotlin-type-system-unveiling-the-mystery-50613f0db893
end • It is more accurate to use “Nothing” as return type to indicate it never return Assume we would Load some data from Database, and throw Exception if it return null (Video example is uploaded here: https://youtu.be/HG210SN4_iI)