Scala Pattern Matching
Understand Scala's powerful pattern matching capabilities.
Basic Pattern Matching
val x: Int = 5
x match {
case 1 => println("one")
case 2 => println("two")
case _ => println("many") // default case
}Matching on Types
def matchType(obj: Any): String = obj match {
case s: String => "Got a String: " + s
case i: Int if i > 0 => "Got a positive Int: " + i
case _: Double => "Got a Double"
case _ => "Unknown type"
}Case Class Matching
case class Person(name: String, age: Int)
val alice = Person("Alice", 25)
alice match {
case Person("Alice", age) => println(s"Hi Alice, age $age")
case Person(name, age) => println(s"Hi $name, age $age")
}Pattern Matching in Collections
val numbers = List(1, 2, 3)
numbers match {
case Nil => println("Empty list")
case head :: tail => println(s"Head: $head, Tail: $tail")
}Advanced Patterns
// Tuple matching
val pair = (1, "two")
pair match {
case (1, s) => println(s"First is 1, second is $s")
case _ => println("Other")
}
// Option matching
val maybeInt: Option[Int] = Some(5)
maybeInt match {
case Some(value) => println(s"Got value: $value")
case None => println("Got nothing")
}