Top 5 Cool Things about Scala 3 (that are not enums)

Top 5 Cool Things about Scala 3 (that are not enums)

....because of course Scala 3 enums are the coolest!

Transcript

1. Top 5 Cool Things about Scala 3 that are not enums @DanielaSfregola Scala 3 Release Party - April 2021
2. Hellooooo • Software Engineer 
 living in London UK • Scala Lover ❤ • OS Maintainer • Author of 
 "Get Programming with Scala" by Manning
 
 35% OFF with code "scala3party"
3. 5 - Improved Type Inference Map("Scala" -> 3).map { (k, v) => s"$k$v" }
4. 5 - Improved Type Inference Map("Scala" -> 3).map { (k, v) => s"$k$v" } Scala 2.13.4
5. 5 - Improved Type Inference Map("Scala" -> 3).map { (k, v) => s"$k$v" } Scala 2.13.4
6. 5 - Improved Type Inference Map("Scala" -> 3).map { (k, v) => s"$k$v" } Scala 3.0.0
7. 5 - Improved Type Inference Map("Scala" -> 3).map { (k, v) => s"$k$v" } Scala 3.0.0 Scala 2.13.4
8. 4 - Procedure Syntax def echo(str: String) { str }
9. 4 - Procedure Syntax def echo(str: String) { str } Scala 2.13.4
10. 4 - Procedure Syntax def echo(str: String) { str } Scala 2.13.4
11. 4 - Procedure Syntax def echo(str: String) { str } Scala 3
12. 4 - Procedure Syntax def echo(str: String) { str } Scala 3
13. 3 - Improved Error Messages Arrested Developers What the Scala Compiler & Lucille Bluth 
 Have In Common by Fiona Condon, NeScala 2017 https://www.youtube.com/watch?v=78iIbiRwFTM
14. 3 - Improved Error Messages def echo(str: String): Unit = { str } def echoTwice(str: String): String = { echo(str) match { case x: String => s"$x$x" } }
15. 3 - Improved Error Messages Scala 2.13.4
16. 3 - Improved Error Messages Scala 2.13.4 Scala 3
17. 2 - Strict Equality List("Scala", "3").headOption == "Scala"
18. 2 - Strict Equality List("Scala", "3").headOption == "Scala" Scala 2.13.4
19. 2 - Strict Equality List("Scala", "3").headOption == "Scala" Scala 2.13.4 Scala 3
20. 1 - Compatibility with 2.13 Migrating to Scala 3 is easy* ! * if you are using Scala 2.13 * if you don't have macros in your code Scala 3 Migration Guide https://scalacenter.github.io/scala-3-migration-guide
21. Thank You! •Twitter: @DanielaSfregola •"Get Programming with Scala" 
 by Manning
 
 35% OFF with code "scala3party"