http://blog.danlew.net/2017/06/14/convincing-the-kotlin-compiler-that-code-is-safe/ https://medium.com/@igorwojda/kotlin-deep-dive-into-generics-nullability-9853d9a9f50d https://superkotlin.com/resources-learn-kotlin/ https://www.packtpub.com/application-development/android-development-ko...