Kotlin
summary
Kotlin is a JetBrains language targeting JVM 1.6 and JavaScript, open source at m3 with an IntelliJ plugin and a Kotlin-demo web IDE for instant play. It adds extension functions to call static helpers like instance methods, makes collections covariant via compiler-only traits (at the cost of throwing UnsupportedOperationException if Java mutates a Kotlin-readonly), and tracks nullable types with ? and !! to reduce NPEs; Java interop uses external annotations to avoid pervasive double-bangs.
AI-written summary · about
chapters (19)
- 0:00Introduction
- 0:39What is Kotlin
- 1:56Current Status
- 3:17Agenda
- 4:10Extension Methods
- 11:46Collections
- 16:07Inheritance
- 17:01Declaration
- 19:05The strategy
- 21:24Summary
- 22:45Nullable types
- 26:28Nullable types summary
- 27:47Not Null Nullable annotations
- 29:10Type annotations
- 30:35Type annotations in different contexts
- 31:20External annotations
- 33:53Conclusion
- 34:44Statics
- 36:22Properties
