Opening Keynote: New Functional Constructs in Scala 3

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" summary

Scala 3 adds concrete, tested constructs: enums as ADTs/GADTs replace verbose sealed-trait + case-class boilerplate and support Java interop (implementation emerging); extension methods via implicit objects give zero-wrapper infix syntax and make type-class APIs work naturally; opaque types for zero-cost abstraction let code hide representations and enable immutable arrays without boxing. Implicit function types and a TASTy middle end are integrated into the dotty toolchain; feature freeze targets 2019 with a stabilization/release goal around mid‑2020.

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" chapters (22)

1. 0:00Intro
2. 3:45Success!
3. 5:39Why Not Stop Here?
4. 9:58New Features in Scala 3
5. 10:31Enumerations
6. 11:14Java Interop
7. 15:45Generalized Algebraic Data Types
8. 18:16Enumeration/ADT Hybrids
9. 23:16Visibility of Extension Methods
10. 24:27Extension Methods and TypeClasses
11. 27:19Higher kinds
12. 29:22Why Extension Methods?
13. 29:50Status of Extension Methods
14. 33:05Immutable Arrays
15. 34:21Why This Is Important
16. 35:59Opaque Types and Value Classes
17. 37:53What About Value Classes?
18. 39:29Implicit Function Types
19. 40:47Example: Ensuring
20. 43:19Tooling
21. 44:28The Tasty Vision
22. 47:11Migration to Scala 3

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