Companion source repository for the Swedish Scala textbook Ett första steg i Scala.

The repository is in the final phase of a Scala 2.8 → Scala 3 migration. See MIGRATION_TO_SCALA3.md for the full plan and per-phase commit log.

sbt compile          # compile all sources
sbt test             # run smoke tests
sbt scalafmtCheckAll # check formatting
sbt scalafix --check # check lint rules

The first sbt invocation will fetch Scala 3.3.5, ScalaTest 3.2.19 and the scalafix/scalafmt plugins.

The classic chapters from the book, kept as a working reference under Scala 3:

src/main/scala/com/programmera/
  scalaland1, scalaland1a, scalaland2, scalaland3, scalaland4   # class chapter
  scalaland_trait                                                # trait/mixin chapter
  scalaland_immutable1, _immutable2, _immutable3                 # objfunc chapter
  scalaland_func_final                                           # func chapter
  scalaland_generic                                              # generics chapter

A few of these (e.g. scalaland_immutable1.Npc, scalaland_immutable2.Npc) are deliberately marked "Incorrect" in their source comments — pedagogical anti-patterns the book uses to contrast against the cleaner alternatives.

New packages introduced during the migration to demonstrate Scala 3 idioms against their Scala 2 originals:

The legacy chapters and the _scala3_* siblings are intended to be read side by side — the contrast is the lesson.

The book itself lives at https://github.com/oluies/ScalaBook in DocBook 5 XML. Clone it as a sibling of this repo:

cd ~/projects && git clone https://github.com/oluies/ScalaBook.git

Tooling under .claude/skills/docbook/ and (forthcoming) scripts/book/ reaches ../ScalaBook by relative path. The two repos stay independent — code lands here, prose lands in ScalaBook.