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Scala 3 practice

0 exercises and 17 quizzes from the lessons of this track. Sample tests run in your browser; what you pass is kept in this browser only.

Start here: Scala 3.9 LTS on the JVM

Quiz: What Scala 3 is and where it runs in 2026 Self-check · 15 questions
Quiz: Install Scala 3.9, a JDK and an editor Self-check · 13 questions
Quiz: First programs: scala run, scripts and the REPL Self-check · 13 questions
Quiz: Read Scala compiler errors and warnings Self-check · 14 questions
Quiz: Scala 3 for Java and Python developers Self-check · 14 questions

Basics: values, numbers, text and control flow

Quiz: val, var, lazy val and type inference Self-check · 12 questions
Quiz: Numbers, BigDecimal and money in paise Self-check · 12 questions
Quiz: Strings, interpolators and regex Self-check · 12 questions
Quiz: if, match, loops and for as expressions Self-check · 12 questions
Quiz: Methods, parameters and @main programs Self-check · 10 questions
Quiz: Packages, imports, exports and top-level code Self-check · 10 questions

Domain modelling: classes, traits, case classes and enums

Quiz: Classes, objects and companion objects Self-check · 16 questions
Quiz: Traits, mixins and linearization Self-check · 11 questions
Quiz: Case classes and immutable data Self-check · 11 questions
Quiz: Enums, sealed traits and ADTs Self-check · 11 questions
Quiz: Scala 3 pattern matching in depth Self-check · 11 questions
Quiz: Opaque types and value classes Self-check · 9 questions

Results here are what this browser has checked: feedback for you, not proof. They stay on this device; your Learn progress can be exported to a file. · Back to the Scala 3 track