Scala Pattern Matching and Case Classes

Question 1

How is pattern matching performed in Scala?

Accepted Answer

using match-case

Answer

using switch-case

Answer

using if-else chains

Answer

using instanceof checks

Question 2

What keyword defines a case class in Scala?

Accepted Answer

case class

Answer

data class

Answer

record

Answer

value class

Question 3

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

Accepted Answer

Match any value (wildcard)

Answer

Match only null

Answer

Match the head element

Answer

Match empty collections

Question 4

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

Accepted Answer

unapply

Answer

apply

Answer

extract

Answer

match

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

No, use instanceof instead

Answer

Only with sealed traits

Answer

Only at compile time

Question 6

What is an extractor object in Scala?

Accepted Answer

An object with an `unapply` method used for custom pattern matching

Answer

An object that extends Iterator

Answer

An object that reads from files

Answer

A singleton that wraps Option