Scala Study Guide 2026
Everything you need to pass the Scala exam in one place: the exam format, every topic to study, real practice questions with explanations, flashcards, and full-length practice tests. Free, no sign-up needed.
📚 Scala Topics to Study (23)
✍️ Sample Scala Questions & Answers
1. What is a monad in Scala functional programming?
A monad is an abstraction that wraps a value and supports `flatMap` (chain) and `unit` (wrap) while satisfying identity and associativity laws.
2. How do you pattern match a Tuple2 in Scala?
Tuple patterns use parentheses to destructure a tuple into its components, e.g., `case (a, b) =>` matches a pair.
3. Which method does a case class automatically generate for pattern matching?
The compiler auto-generates `unapply` for case classes, which the pattern matcher calls to destructure an object.
4. What is the difference between `map` and `flatMap` on a Scala Future?
`map` applies a synchronous function to the Future's result, while `flatMap` chains a function that itself returns a Future.
5. How do you add an element to the front of a Scala immutable List?
The `::` cons operator prepends an element to a Scala List, returning a new List with the element at the front.
6. Can case objects be used in pattern matching in Scala?
Case objects are singletons and are matched by reference identity in match expressions, making them ideal for enum-like values.