Kotlin 1.5 preview

Transcript

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!