Learn Scala

This repository is intended as a helper for everyone who wants to improve their Scala knowledge, be it beginners or more advanced users. Links in the sections are provided in no specific order.

The list is still incomplete, any additional resources for existing sections or whole sections are welcome, just raise a pull request.

General trainings and books

• Scala exercises https://www.scala-exercises.org/scala_tutorial/terms_and_types
• Scala at Light Speed https://www.youtube.com/watch?v=-8V6bMjThNo&list=PLmtsMNDRU0BxryRX4wiwrTZ661xcp6VPM
• (paid) Rock The JVM https://rockthejvm.com
• (paid, free preview) Hands on Scala by Li Haoi https://www.handsonscala.com/chapter-1-hands-on-scala.html
• Scala with Cats by Underscore https://www.scalawithcats.com/dist/scala-with-cats.html
• Functional Programming in Scala by Martin Odersky https://www.coursera.org/learn/progfun1
• Strategic Scala Style: Principle of Least Power by Li Haoi https://www.lihaoyi.com/post/StrategicScalaStylePrincipleofLeastPower.html
• Lightbend Scala Language - Professional https://academy.lightbend.com/courses/course-v1:lightbend+LSL-P-Scala-Language-Professional+v1/about
• Foundations of Functional Programming in Scala https://www.youtube.com/watch?v=OdPaWmRnAc4&list=PLiYD0LWExCDkXGpYRY3WjNscDfhe4D0ND
• (paid) Inner-product training https://www.inner-product.com/services/training/
• (paid) Zainab Ali's training https://kebab-ca.se/training.html

Blogs, newsletters and channels

• Softwaremill
  • Scala Times newsletter https://scalatimes.com/
  • Blog https://softwaremill.com/blog/
• Petr Zapletal
  • https://petr-zapletal.medium.com/
• Salar Rahmanian
  • Scala news https://www.scalanews.net/
• Daniel Ciocîrlan
  • https://www.youtube.com/@rockthejvm/videos
  • https://blog.rockthejvm.com/
• Jakub Kozłowski
  • https://www.youtube.com/@kubukoz_/videos
  • https://blog.kubukoz.com/
• Dev inside you
  • https://www.youtube.com/@DevInsideYou/videos
  • https://devinsideyou.com/
• Li Haoyi
  • https://www.lihaoyi.com/
• Michał Pawlik
  • https://blog.michalp.net/

Language aspects

Type system hierarchy

• https://docs.scala-lang.org/tour/unified-types.html
• https://www.artima.com/scalazine/articles/scalas_type_system.html

Case classes

• https://docs.scala-lang.org/tour/case-classes.html
• https://docs.scala-lang.org/overviews/scala-book/case-classes.html

Traits

• https://docs.scala-lang.org/tour/traits.html
• https://docs.scala-lang.org/overviews/scala-book/traits-interfaces.html

Pattern matching

• https://docs.scala-lang.org/tour/pattern-matching.html
• https://alvinalexander.com/scala/how-to-use-pattern-matching-scala-match-case-expressions/
• https://data-flair.training/blogs/scala-pattern-matching/

Option and Either

• https://xebia.com/blog/try-option-or-either/
• https://alvinalexander.com/scala/best-practice-eliminate-null-values-from-code-scala-idioms/
• https://danielwestheide.com/blog/the-neophytes-guide-to-scala-part-7-the-either-type/

Collections, for comprehension

• https://docs.scala-lang.org/overviews/scala-book/collections-101.html
• https://docs.scala-lang.org/tour/for-comprehensions.html

Implicits

• https://www.artima.com/pins1ed/implicit-conversions-and-parameters.html
• https://www.lihaoyi.com/post/ImplicitDesignPatternsinScala.html
• https://scala-fmi.github.io/scala-fmi-2019/lectures/08-implicits.html
• https://apiumhub.com/tech-blog-barcelona/scala-implicits/

Future - asynchronous and parallel operations

• https://docs.scala-lang.org/overviews/scala-book/futures.html
• https://docs.scala-lang.org/overviews/core/futures.html
• https://danielwestheide.com/blog/the-neophytes-guide-to-scala-part-8-welcome-to-the-future/

Advanced Scala usage and libraries

Databases

Slick

• https://scala-slick.org/doc/3.3.1/introduction.html
• https://books.underscore.io/essential-slick/essential-slick-3.html

Doobie

• https://tpolecat.github.io/doobie/

Quill

• https://getquill.io/
• https://zio.dev/zio-quill/
• https://github.com/zio/zio-protoquill

Working with Json

Circe

• https://circe.github.io/circe/

Jsoniter Scala

• https://github.com/plokhotnyuk/jsoniter-scala
• https://blog.lambdaspot.dev/the-fastest-and-safest-json-parser-and-serializer-for-scala

IO

• https://typelevel.org/cats-effect/datatypes/io.html
• https://typelevel.org/blog/2017/05/02/io-monad-for-cats.html
• https://medium.com/walmartlabs/understanding-io-monad-in-scala-b495ca572174

ZIO

• https://zio.dev/

Monix

• https://monix.io/

Messaging

pass4s

• https://ocadotechnology.github.io/pass4s/
• https://blog.michalp.net/posts/scala/pass4s-basics/

Type classes

• https://tpolecat.github.io/2013/10/12/typeclass.html
• https://scalac.io/typeclasses-in-scala/
• https://www.scala-exercises.org/scala_tutorial/type_classes

Cats

• https://underscore.io/books/scala-with-cats/
• https://typelevel.org/cats/
• https://www.scala-exercises.org/cats/semigroup

Higher-kinded types

• https://medium.com/bigpanda-engineering/understanding-f-in-scala-4bec5996761f
• https://dzone.com/articles/scalafp-the-mystery-of-scalas-higher-kinded-types
• https://www.stephanboyer.com/post/115/higher-rank-and-higher-kinded-types

Tagless final

• https://blog.rockthejvm.com/tagless-final/
• https://blog.softwaremill.com/final-tagless-seen-alive-79a8d884691d
• https://blog.softwaremill.com/bake-your-bread-tagless-final-style-dea9448b3dc3
• https://www.basementcrowd.com/2019/01/17/an-introduction-to-tagless-final-in-scala/
• https://scalac.io/tagless-final-pattern-for-scala-code/

FP in general

• https://github.com/mmenestret/fp-resources
• http://adit.io/posts/2013-04-17-functors,_applicatives,_and_monads_in_pictures.html

Streaming

FS2

• https://fs2.io/

OAuth2

sttp-oauth2

• https://ocadotechnology.github.io/sttp-oauth2/
• https://blog.michalp.net/posts/scala/oauth2-app-p1/