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
   

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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"
   

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3. 5 - Improved Type Inference
   Map("Scala" -> 3).map { (k, v) => s"$k$v" }
   

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4. 5 - Improved Type Inference
   Map("Scala" -> 3).map { (k, v) => s"$k$v" }
   Scala 2.13.4
   

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5. 5 - Improved Type Inference
   Map("Scala" -> 3).map { (k, v) => s"$k$v" }
   Scala 2.13.4
   

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6. 5 - Improved Type Inference
   Map("Scala" -> 3).map { (k, v) => s"$k$v" }
   Scala 3.0.0
   

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7. 5 - Improved Type Inference
   Map("Scala" -> 3).map { (k, v) => s"$k$v" }
   Scala 3.0.0
   Scala 2.13.4
   

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8. 4 - Procedure Syntax
   def echo(str: String) {
   str
   }
   

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9. 4 - Procedure Syntax
   def echo(str: String) {
   str
   }
   Scala 2.13.4
   

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10. 4 - Procedure Syntax
    def echo(str: String) {
    str
    }
    Scala 2.13.4
    

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11. 4 - Procedure Syntax
    def echo(str: String) {
    str
    }
    Scala 3
    

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12. 4 - Procedure Syntax
    def echo(str: String) {
    str
    }
    Scala 3
    

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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
    

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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"
    }
    }
    

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15. 3 - Improved Error Messages
    Scala 2.13.4
    

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16. 3 - Improved Error Messages
    Scala 2.13.4
    Scala 3
    

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17. 2 - Strict Equality
    List("Scala", "3").headOption == "Scala"
    

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18. 2 - Strict Equality
    List("Scala", "3").headOption == "Scala"
    Scala 2.13.4
    

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19. 2 - Strict Equality
    List("Scala", "3").headOption == "Scala"
    Scala 2.13.4
    Scala 3
    

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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
    

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21. Thank You!
    •Twitter: @DanielaSfregola
    
    •"Get Programming with Scala" 

    by Manning

    

    35% OFF with code "scala3party"
    

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