The subject has been discussed to death here on HN and in other places. If you're unfamiliar, this talk by Hoare (the inventor of implicit nullability) is as go

The subject has been discussed to death here on HN and in other places. If you're unfamiliar, this talk by Hoare (the inventor of implicit nullability) is as good a place to start as any: https://www.infoq.com/presentations/Null-References-The-Billion-Dollar-Mistake-Tony-Hoare/ https://www.infoq.com/presentations/Null-References-The-Bill...