exercism · LarsWestergren · Aug 21, 2022 · Aug 21, 2022 · Aug 31, 2022 · Sep 1, 2022
diff --git a/docs/INSTALLATION.md b/docs/INSTALLATION.md
@@ -1,13 +1,18 @@
 # Installing [Scala](http://www.scala-lang.org)
 
+Scala can run on the JVM, but also has support for JS integration and even compilation to native code.
+For help install various dependencies, consider using [Scala-CLI](https://scala-cli.virtuslab.org/)
 
-In addition to the exercism CLI and your favorite text editor, practicing with Exercism exercises in Scala requires:
+Another alternative is [SDKMAN](https://sdkman.io/)
+to manage your Java and Java-adjacent development tools and libraries.
+
+If you do wish to have full control over package installation, you need to manually install
 
 * Java Development Kit (JDK) 17 or later. Use your preferred vendor or grab one from [Adoptium](https://adoptium.net/)
-* [Scala 2.13.x](https://www.scala-lang.org/download/scala2.html)
+* [Scala 3.1.x](https://www.scala-lang.org/download/)
 * [sbt 1.7.x](https://www.scala-sbt.org/download.html)
 
-If you don't want install these various dependencies by hand, consider using [SDKMAN](https://sdkman.io/) to manage your java and java-adjacent development tools and libraries. 
+
 
 ---
 
@@ -20,7 +25,8 @@ To get started, see "[Running the Tests](https://exercism.org/docs/tracks/scala/
 # Scala IDEs
 
 * [IntelliJ IDEA with Scala Plugin](https://www.jetbrains.com/idea/)
-* [ScalaIDE](http://scala-ide.org/index.html)
+* [VS Code with Metals](https://scalameta.org/metals/docs/editors/vscode)
+* [Vim or Neovim with Metals](https://scalameta.org/metals/docs/editors/vim)
+* [Sublime with Metals](https://scalameta.org/metals/docs/editors/sublime)
+* [Emacs with Metals](https://scalameta.org/metals/docs/editors/emacs)
 * [NetBeans with Scala Plugin](https://netbeans.org/)
-* [Metals with VS Code](https://scalameta.org/metals/docs/editors/vscode)
-* [Metals with Vim or Neovim](https://scalameta.org/metals/docs/editors/vim)
diff --git a/docs/LEARNING.md b/docs/LEARNING.md
@@ -1,14 +1,30 @@
 # Learning
 
+## Online Courses
+
+
+* [The Scala Center](https://docs.scala-lang.org/online-courses.html) - The Scala Center is an independent not-for-profit center focused on open source and
+  learning. They have a syllabus and links to various learning platforms.
+* [Functional Programming Principles in Scala](https://www.coursera.org/learn/progfun1) - In this course you will discover the elements of the functional programming style and learn how to apply them usefully in your daily programming tasks. You will also develop a solid foundation for reasoning about functional programs, by touching upon proofs of invariants and the tracing of execution symbolically.
+* [Functional Program Design in Scala](https://www.coursera.org/learn/progfun2) -  In this course you will learn how to apply the functional programming style in the design of larger applications.
+
 ## Books
 
+* [Learn Scala 3 the Fast Way - Alvin Alexander](https://alvinalexander.com/scala/learn-scala-3-the-fast-way-book/)
+* [Hands on Scala Programming - Li Haoyi](https://www.handsonscala.com/)
 * [Programming Scala - Dean Wampler, Ph.D.](http://shop.oreilly.com/product/0636920033073.do)
 * [Programming in Scala - Oderksy, Spoon, Venners](http://www.artima.com/shop/programming_in_scala_3ed)
 * [Functional Programming in Scala - Chiusano, Bjarnason](https://www.manning.com/books/functional-programming-in-scala)
 * [Scala for the Impatient - Cay S. Horstmann](http://horstmann.com/scala/)
-* [Hands on Scala Programming - Li Haoyi](https://www.handsonscala.com/)
 
-## Online Courses
+## Free Online Books
 
-* [Functional Programming Principles in Scala](https://www.coursera.org/learn/progfun1) - In this course you will discover the elements of the functional programming style and learn how to apply them usefully in your daily programming tasks. You will also develop a solid foundation for reasoning about functional programs, by touching upon proofs of invariants and the tracing of execution symbolically.
-* [Functional Program Design in Scala](https://www.coursera.org/learn/progfun2) -  In this course you will learn how to apply the functional programming style in the design of larger applications.
+* [EBook Foundations List of Free Programming Books](https://github.com/EbookFoundation/free-programming-books/blob/main/books/free-programming-books-langs.md#scala)
+
+## Youtube channels
+
+* [Dr Mark Lewis](https://www.youtube.com/user/drmarkclewis)
+* [Scala In The City](https://www.youtube.com/c/ScalaintheCity/)
+* [Rock the JVM](https://www.youtube.com/c/RocktheJVM/)
+* [Konfy](https://www.youtube.com/c/Konfy/)
+* [DevInsideYou](https://www.youtube.com/c/DevInsideYou)
diff --git a/docs/RESOURCES.md b/docs/RESOURCES.md
@@ -4,13 +4,20 @@
 
 Exercism provides exercises and feedback but can be difficult to jump into for those learning Scala for the first time. These resources can help you get started:
 
-* [Scala - Getting Started](http://www.scala-lang.org/documentation/getting-started.html)
-* [StackOverflow](http://stackoverflow.com/)
+* [Scala - Getting Started](https://docs.scala-lang.org/getting-started/index.html)
+* [StackOverflow](https://stackoverflow.com/)
 * [Scala Exercises](https://www.scala-exercises.org/std_lib)
 * [The Neophyte's Guide to Scala](https://danielwestheide.com/books/the-neophytes-guide-to-scala/)
 
 ## Linting
 
-Scala projects can be linted for further code analysis via a third party tool - [Scalastyle](http://www.scalastyle.org/).
+Scala projects can be linted for further code analysis via a third party tool 
 
-There are several ways of using Scalastyle including Maven, SBT, Gradle, IntelliJ and Eclipse. For instructions on usage visit [Scalastyle](http://www.scalastyle.org/).
+* [Scalafix](https://scalacenter.github.io/scalafix/)
+* [Scalafmt](https://scalameta.org/scalafmt/#Scalafmt-codeformatterforScala)
+
+## REPLs and scripting
+
+* [Scastie - browser REPL](https://scastie.scala-lang.org/)
+* [Ammonite shell REPL and scripting tools](http://ammonite.io/) 
+* [ScribbleNinja - Scala.js in your browser](https://scribble.ninja/)
diff --git a/docs/TESTS.md b/docs/TESTS.md
@@ -16,9 +16,4 @@ $ sbt
 Note that all tests have been disabled except the first one for you to work on. 
 To continue, just remove the `pending` keyword from the beginning of each test case.
 
-Tests can also be run within the following IDEs
-
-* [IntelliJ IDEA with Scala Plugin](https://www.jetbrains.com/idea/)
-* [ScalaIDE](http://scala-ide.org/index.html)
-* [NetBeans with Scala Plugin](https://netbeans.org/)
-
+Tests can also be run within the IDEs listed on the "Installing Scala Locally" page.
diff --git a/exercises/concept/basics/build.sbt b/exercises/concept/basics/build.sbt
@@ -1,3 +1,3 @@
-scalaVersion := "2.13.6"
+scalaVersion := "3.1.3"
 
 libraryDependencies += "org.scalatest" %% "scalatest" % "3.2.10" % "test"
diff --git a/exercises/practice/accumulate/build.sbt b/exercises/practice/accumulate/build.sbt
@@ -1,3 +1,3 @@
-scalaVersion := "2.13.6"
+scalaVersion := "3.1.3"
 
 libraryDependencies += "org.scalatest" %% "scalatest" % "3.2.10" % "test"
diff --git a/exercises/practice/acronym/build.sbt b/exercises/practice/acronym/build.sbt
@@ -1,3 +1,3 @@
-scalaVersion := "2.13.6"
+scalaVersion := "3.1.3"
 
 libraryDependencies += "org.scalatest" %% "scalatest" % "3.2.10" % "test"
diff --git a/exercises/practice/all-your-base/build.sbt b/exercises/practice/all-your-base/build.sbt
@@ -1,3 +1,3 @@
-scalaVersion := "2.13.6"
+scalaVersion := "3.1.3"
 
 libraryDependencies += "org.scalatest" %% "scalatest" % "3.2.10" % "test"
diff --git a/exercises/practice/allergies/build.sbt b/exercises/practice/allergies/build.sbt
@@ -1,3 +1,3 @@
-scalaVersion := "2.13.6"
+scalaVersion := "3.1.3"
 
 libraryDependencies += "org.scalatest" %% "scalatest" % "3.2.10" % "test"
diff --git a/exercises/practice/alphametics/build.sbt b/exercises/practice/alphametics/build.sbt
@@ -1,4 +1,4 @@
-scalaVersion := "2.13.6"
+scalaVersion := "3.1.3"
 
 libraryDependencies += "org.scalatest" %% "scalatest" % "3.2.10" % "test"
 libraryDependencies += "org.scala-lang.modules" %% "scala-parser-combinators" % "2.1.0"
diff --git a/exercises/practice/anagram/build.sbt b/exercises/practice/anagram/build.sbt
@@ -1,4 +1,4 @@
-scalaVersion := "2.13.6"
+scalaVersion := "3.1.3"
 
 libraryDependencies += "org.scalatest" %% "scalatest" % "3.2.10" % "test"
 
diff --git a/exercises/practice/armstrong-numbers/build.sbt b/exercises/practice/armstrong-numbers/build.sbt
@@ -1,3 +1,3 @@
-scalaVersion := "2.13.6"
+scalaVersion := "3.1.3"
 
 libraryDependencies += "org.scalatest" %% "scalatest" % "3.2.10" % "test"
diff --git a/exercises/practice/atbash-cipher/build.sbt b/exercises/practice/atbash-cipher/build.sbt
@@ -1,3 +1,3 @@
-scalaVersion := "2.13.6"
+scalaVersion := "3.1.3"
 
 libraryDependencies += "org.scalatest" %% "scalatest" % "3.2.10" % "test"
diff --git a/exercises/practice/bank-account/build.sbt b/exercises/practice/bank-account/build.sbt
@@ -1,4 +1,4 @@
-scalaVersion := "2.13.6"
+scalaVersion := "3.1.3"
 
 libraryDependencies += "org.scalatest" %% "scalatest" % "3.2.10" % "test"
 
diff --git a/exercises/practice/beer-song/build.sbt b/exercises/practice/beer-song/build.sbt
@@ -1,3 +1,3 @@
-scalaVersion := "2.13.6"
+scalaVersion := "3.1.3"
 
 libraryDependencies += "org.scalatest" %% "scalatest" % "3.2.10" % "test"
diff --git a/exercises/practice/binary-search-tree/.meta/Example.scala b/exercises/practice/binary-search-tree/.meta/Example.scala
@@ -1,5 +1,9 @@
+import math.Ordered.orderingToOrdered
+
 case class Bst[+T](value: T, left: Option[Bst[T]], right: Option[Bst[T]]) {
-  def insert[U >: T <% Ordered[U]](x: U): Bst[U] = {
+
+  def insert[U >: T](x: U)(implicit ord: Ordering[U]): Bst[U] = {
+
     def insert(x: U, node: Option[Bst[U]]): Option[Bst[U]] =
       node match {
         case Some(n) => Option(n.insert(x))
@@ -12,7 +16,7 @@ case class Bst[+T](value: T, left: Option[Bst[T]], right: Option[Bst[T]]) {
 }
 
 object Bst {
-  def fromList[T <% Ordered[T]](l: List[T]): Bst[T] = l match {
+  def fromList[T](l: List[T])(implicit ord: Ordering[T]): Bst[T] = l match {
     case x::xs => xs.foldLeft(Bst(x, None, None))((r, e) => r.insert(e))
     case x::Nil => Bst(x, None, None)
     case Nil => throw new IllegalArgumentException("Tree must not be empty")
@@ -26,4 +30,4 @@ object Bst {
   }
 
   def apply[T](x: T): Bst[T] = Bst(x, None, None)
-}
+}
diff --git a/exercises/practice/binary-search-tree/build.sbt b/exercises/practice/binary-search-tree/build.sbt
@@ -1,3 +1,3 @@
-scalaVersion := "2.13.6"
+scalaVersion := "3.1.3"
 
 libraryDependencies += "org.scalatest" %% "scalatest" % "3.2.10" % "test"
diff --git a/exercises/practice/binary-search/.meta/Example.scala b/exercises/practice/binary-search/.meta/Example.scala
@@ -1,5 +1,7 @@
 import scala.annotation.tailrec
 
+import math.Ordering.Implicits.infixOrderingOps
+
 object BinarySearch {
   def find[T](seq: Seq[T], value: T)(implicit ord: T => Ordered[T]): Option[Int]
     = searchInternal(seq, value, 0, seq.size - 1)

diff --git a/exercises/practice/binary-search/build.sbt b/exercises/practice/binary-search/build.sbt
@@ -1,3 +1,3 @@
-scalaVersion := "2.13.6"
+scalaVersion := "3.1.3"
 
 libraryDependencies += "org.scalatest" %% "scalatest" % "3.2.10" % "test"
diff --git a/exercises/practice/binary/build.sbt b/exercises/practice/binary/build.sbt
@@ -1,3 +1,3 @@
-scalaVersion := "2.13.6"
+scalaVersion := "3.1.3"
 
 libraryDependencies += "org.scalatest" %% "scalatest" % "3.2.10" % "test"
diff --git a/exercises/practice/bob/build.sbt b/exercises/practice/bob/build.sbt
@@ -1,3 +1,3 @@
-scalaVersion := "2.13.6"
+scalaVersion := "3.1.3"
 
 libraryDependencies += "org.scalatest" %% "scalatest" % "3.2.10" % "test"
diff --git a/exercises/practice/book-store/build.sbt b/exercises/practice/book-store/build.sbt
@@ -1,3 +1,3 @@
-scalaVersion := "2.13.6"
+scalaVersion := "3.1.3"
 
 libraryDependencies += "org.scalatest" %% "scalatest" % "3.2.10" % "test"
diff --git a/exercises/practice/bowling/build.sbt b/exercises/practice/bowling/build.sbt
@@ -1,3 +1,3 @@
-scalaVersion := "2.13.6"
+scalaVersion := "3.1.3"
 
 libraryDependencies += "org.scalatest" %% "scalatest" % "3.2.10" % "test"
diff --git a/exercises/practice/change/build.sbt b/exercises/practice/change/build.sbt
@@ -1,3 +1,3 @@
-scalaVersion := "2.13.6"
+scalaVersion := "3.1.3"
 
 libraryDependencies += "org.scalatest" %% "scalatest" % "3.2.10" % "test"
diff --git a/exercises/practice/clock/build.sbt b/exercises/practice/clock/build.sbt
@@ -1,3 +1,3 @@
-scalaVersion := "2.13.6"
+scalaVersion := "3.1.3"
 
 libraryDependencies += "org.scalatest" %% "scalatest" % "3.2.10" % "test"
diff --git a/exercises/practice/collatz-conjecture/build.sbt b/exercises/practice/collatz-conjecture/build.sbt
@@ -1,3 +1,3 @@
-scalaVersion := "2.13.6"
+scalaVersion := "3.1.3"
 
 libraryDependencies += "org.scalatest" %% "scalatest" % "3.2.10" % "test"
diff --git a/exercises/practice/complex-numbers/build.sbt b/exercises/practice/complex-numbers/build.sbt
@@ -1,3 +1,3 @@
-scalaVersion := "2.13.6"
+scalaVersion := "3.1.3"
 
 libraryDependencies += "org.scalatest" %% "scalatest" % "3.2.10" % "test"
diff --git a/exercises/practice/complex-numbers/src/test/scala/ComplexNumberTest.scala b/exercises/practice/complex-numbers/src/test/scala/ComplexNumberTest.scala
@@ -7,7 +7,7 @@ class ComplexNumberTest extends AnyFunSuite with Matchers {
 
   private val equalityEpsilon = 1e-15
 
-  private def assertEquals(c1: ComplexNumber, c2: ComplexNumber) {
+  private def assertEquals(c1: ComplexNumber, c2: ComplexNumber) = {
     c1.real should be (c2.real +- equalityEpsilon)
     c1.imaginary should be (c2.imaginary +- equalityEpsilon)
   }

diff --git a/exercises/practice/connect/build.sbt b/exercises/practice/connect/build.sbt
@@ -1,3 +1,3 @@
-scalaVersion := "2.13.6"
+scalaVersion := "3.1.3"
 
 libraryDependencies += "org.scalatest" %% "scalatest" % "3.2.10" % "test"
diff --git a/exercises/practice/crypto-square/build.sbt b/exercises/practice/crypto-square/build.sbt
@@ -1,3 +1,3 @@
-scalaVersion := "2.13.6"
+scalaVersion := "3.1.3"
 
 libraryDependencies += "org.scalatest" %% "scalatest" % "3.2.10" % "test"
diff --git a/exercises/practice/custom-set/build.sbt b/exercises/practice/custom-set/build.sbt
@@ -1,4 +1,4 @@
-scalaVersion := "2.13.6"
+scalaVersion := "3.1.3"
 
 libraryDependencies += "org.scalatest" %% "scalatest" % "3.2.10" % "test"
 
diff --git a/exercises/practice/darts/build.sbt b/exercises/practice/darts/build.sbt
@@ -1,3 +1,3 @@
-scalaVersion := "2.13.6"
+scalaVersion := "3.1.3"
 
 libraryDependencies += "org.scalatest" %% "scalatest" % "3.2.10" % "test"
diff --git a/exercises/practice/diamond/build.sbt b/exercises/practice/diamond/build.sbt
@@ -1,3 +1,3 @@
-scalaVersion := "2.13.6"
+scalaVersion := "3.1.3"
 
 libraryDependencies += "org.scalatest" %% "scalatest" % "3.2.10" % "test"
diff --git a/exercises/practice/difference-of-squares/build.sbt b/exercises/practice/difference-of-squares/build.sbt
@@ -1,3 +1,3 @@
-scalaVersion := "2.13.6"
+scalaVersion := "3.1.3"
 
 libraryDependencies += "org.scalatest" %% "scalatest" % "3.2.10" % "test"
diff --git a/exercises/practice/dominoes/build.sbt b/exercises/practice/dominoes/build.sbt
@@ -1,4 +1,4 @@
-scalaVersion := "2.13.6"
+scalaVersion := "3.1.3"
 
 libraryDependencies += "org.scalatest" %% "scalatest" % "3.2.10" % "test"
 
diff --git a/exercises/practice/etl/build.sbt b/exercises/practice/etl/build.sbt
@@ -1,3 +1,3 @@
-scalaVersion := "2.13.6"
+scalaVersion := "3.1.3"
 
 libraryDependencies += "org.scalatest" %% "scalatest" % "3.2.10" % "test"
diff --git a/exercises/practice/flatten-array/build.sbt b/exercises/practice/flatten-array/build.sbt
@@ -1,3 +1,3 @@
-scalaVersion := "2.13.6"
+scalaVersion := "3.1.3"
 
 libraryDependencies += "org.scalatest" %% "scalatest" % "3.2.10" % "test"
diff --git a/exercises/practice/food-chain/build.sbt b/exercises/practice/food-chain/build.sbt
@@ -1,4 +1,4 @@
-scalaVersion := "2.13.6"
+scalaVersion := "3.1.3"
 
 libraryDependencies += "org.scalatest" %% "scalatest" % "3.2.10" % "test"
 
diff --git a/exercises/practice/forth/build.sbt b/exercises/practice/forth/build.sbt
@@ -1,4 +1,4 @@
-scalaVersion := "2.13.6"
+scalaVersion := "3.1.3"
 
 libraryDependencies += "org.scalatest" %% "scalatest" % "3.2.10" % "test"
 libraryDependencies += "org.scala-lang.modules" %% "scala-parser-combinators" % "2.1.0"
diff --git a/exercises/practice/gigasecond/build.sbt b/exercises/practice/gigasecond/build.sbt
@@ -1,3 +1,3 @@
-scalaVersion := "2.13.6"
+scalaVersion := "3.1.3"
 
 libraryDependencies += "org.scalatest" %% "scalatest" % "3.2.10" % "test"
diff --git a/exercises/practice/grade-school/.meta/Example.scala b/exercises/practice/grade-school/.meta/Example.scala
@@ -7,7 +7,7 @@ class School {
 
   def db: DB = _db
 
-  def add(name: String, g: Int) {
+  def add(name: String, g: Int) = {
     _db = db.updated(g, grade(g) :+ name)
   }
 

diff --git a/exercises/practice/grade-school/build.sbt b/exercises/practice/grade-school/build.sbt
@@ -1,4 +1,4 @@
-scalaVersion := "2.13.6"
+scalaVersion := "3.1.3"
 
 libraryDependencies += "org.scalatest" %% "scalatest" % "3.2.10" % "test"
 
diff --git a/exercises/practice/grains/build.sbt b/exercises/practice/grains/build.sbt
@@ -1,3 +1,3 @@
-scalaVersion := "2.13.6"
+scalaVersion := "3.1.3"
 
 libraryDependencies += "org.scalatest" %% "scalatest" % "3.2.10" % "test"
diff --git a/exercises/practice/hamming/build.sbt b/exercises/practice/hamming/build.sbt
@@ -1,3 +1,3 @@
-scalaVersion := "2.13.6"
+scalaVersion := "3.1.3"
 
 libraryDependencies += "org.scalatest" %% "scalatest" % "3.2.10" % "test"
diff --git a/exercises/practice/hello-world/build.sbt b/exercises/practice/hello-world/build.sbt
@@ -1,3 +1,3 @@
-scalaVersion := "2.13.6"
+scalaVersion := "3.1.3"
 
 libraryDependencies += "org.scalatest" %% "scalatest" % "3.2.10" % "test"
diff --git a/exercises/practice/hexadecimal/build.sbt b/exercises/practice/hexadecimal/build.sbt
@@ -1,3 +1,3 @@
-scalaVersion := "2.13.6"
+scalaVersion := "3.1.3"
 
 libraryDependencies += "org.scalatest" %% "scalatest" % "3.2.10" % "test"
diff --git a/exercises/practice/high-scores/build.sbt b/exercises/practice/high-scores/build.sbt
@@ -1,3 +1,3 @@
-scalaVersion := "2.13.6"
+scalaVersion := "3.1.3"
 
 libraryDependencies += "org.scalatest" %% "scalatest" % "3.2.10" % "test"
diff --git a/exercises/practice/house/build.sbt b/exercises/practice/house/build.sbt
@@ -1,3 +1,3 @@
-scalaVersion := "2.13.6"
+scalaVersion := "3.1.3"
 
 libraryDependencies += "org.scalatest" %% "scalatest" % "3.2.10" % "test"
diff --git a/exercises/practice/isogram/build.sbt b/exercises/practice/isogram/build.sbt
@@ -1,3 +1,3 @@
-scalaVersion := "2.13.6"
+scalaVersion := "3.1.3"
 
 libraryDependencies += "org.scalatest" %% "scalatest" % "3.2.10" % "test"
diff --git a/exercises/practice/kindergarten-garden/build.sbt b/exercises/practice/kindergarten-garden/build.sbt
@@ -1,4 +1,4 @@
-scalaVersion := "2.13.6"
+scalaVersion := "3.1.3"
 
 libraryDependencies += "org.scalatest" %% "scalatest" % "3.2.10" % "test"
 
diff --git a/exercises/practice/largest-series-product/build.sbt b/exercises/practice/largest-series-product/build.sbt
@@ -1,3 +1,3 @@
-scalaVersion := "2.13.6"
+scalaVersion := "3.1.3"
 
 libraryDependencies += "org.scalatest" %% "scalatest" % "3.2.10" % "test"
diff --git a/exercises/practice/leap/build.sbt b/exercises/practice/leap/build.sbt
@@ -1,3 +1,3 @@
-scalaVersion := "2.13.6"
+scalaVersion := "3.1.3"
 
 libraryDependencies += "org.scalatest" %% "scalatest" % "3.2.10" % "test"