How Scala MAGICALLY turns everything into functions!

Jakub Kozłowski explains the mechanics behind how Scala allows collections and case classes to be invoked like functions using the apply method.

Have you ever wondered why collections in Scala can be called like functions? Or how you don't need to write "new" when creating a case class instance? This video is for you - we'll uncover the secret of what makes it all work. If you enjoyed this video, please like and subscribe, and hit the bell icon so you don't miss another one ;) I'm on Twitter: twitter.com/kubukoz on GitHub: github.com/kubukoz sometimes stream on Twitch: twitch.tv/kubukoz And you can buy me a coffee if you want: ko-fi.com/kubukoz Read the code: github.com/kubukoz/videos/tree/main/everything-function Chapters: Have you ever wondered why collections in Scala can be called like functions? Or how you don't need to write "new" when creating a case class instance? This video is for you - we'll uncover the secret of what makes it all work. If you enjoyed this video, please like and subscribe, and hit the bell icon so you don't miss another one ;) I'm on Twitter: twitter.com/kubukoz on GitHub: github.com/kubukoz sometimes stream on Twitch: twitch.tv/kubukoz And you can buy me a coffee if you want: ko-fi.com/kubukoz Read the code: github.com/kubukoz/videos/tree/main/everything-function Chapters: 00:00:00 - Introduction 00:00:14 - Collections as functions 00:02:31 - How does it work? 00:03:17 - apply as a factory method 00:04:14 - What case classes do 00:04:40 - Smart constructors 00:05:29 - Summoning typeclass instances 00:05:59 - Pitfalls - complexity of a rare feature 00:07:14 - Pitfall - accidental implicit conversion 00:08:42 - Scala 3's Conversion type to the rescue 00:09:12 - unapply 00:10:16 - Summary 00:10:39 - Parting words