Scala Pattern Matching and Case Classes

Question 1

How is pattern matching performed in Scala?

Accepted Answer

using match-case

Answer

Scala uses `match-case` blocks for pattern matching, providing a powerful and expressive alternative to switch statements.

Question 2

What keyword defines a case class in Scala?

Accepted Answer

case class

Answer

Scala's `case class` automatically generates `equals`, `hashCode`, `toString`, and an `unapply` method for pattern matching.

Question 3

What does the `_` pattern mean in a Scala match expression?

Accepted Answer

Match any value (wildcard)

Answer

The `_` wildcard pattern matches any value and is typically used as the default catch-all case in a match expression.

Question 4

Which method does a case class automatically generate for pattern matching?

Accepted Answer

unapply

Answer

The compiler auto-generates `unapply` for case classes, which the pattern matcher calls to destructure an object.

Question 5

Can you pattern match on the type of a value in Scala?

Accepted Answer

Yes, using type patterns like `case x: String =>`

Answer

Scala supports typed patterns such as `case x: String =>` to match and bind a variable when the value is of a given type.

Scala Practice Test