Kotlin 1.5 preview

1. Kotlin 1.5 preview Kotlin愛好会 vol.27
2. About Me • Matthew Vern / Panini • Twitter: @panini_ja Github: panpanini • Mercari, Inc • Android Engineer (US) • Kotlin可愛い
3. Summary • Sealed Class improvements • Sealed Interface • Reference: https://zsmb.co/sealed-goodies-coming-in-kotlin-1-5/
4. Sealed Class improvements
5. Kotlin ~1.4 Sealed Class • https://kotlinlang.org/docs/sealed-classes.html • Enum with super power • Can be defined either nested, or in the same file • https://qiita.com/kikuchy/items/ad89a12029082be8d218
6. Kotlin ~1.4 Sealed Class
7. Kotlin ~1.4 Sealed Class
8. Kotlin ~1.4 Sealed Class
9. Kotlin 1.5+ Sealed Class • https://kotlinlang.org/docs/sealed-classes.html • Can be defined anywhere in the same package, and same module
10. Sealed Interface
11. Kotlin 1.5+ Sealed Interface • https://kotlinlang.org/docs/sealed-classes.html#sealed-interfaces • Implementations must be declared in same package and same module • Can restrict implementers to inside a single module ◦ Useful for hiding implementation details • YouTrack: https://youtrack.jetbrains.com/issue/KT-22286
12. Summary • Sealed Class is like super enum • Sealed Interface is like package private Interface • Kotlin 1.5 looks good!
13. Have a nice Kotlin!