Scala Match Case: Matching Multiple Values

In Scala, you can combine multiple values together to form a matching pattern using a comma. For example:

val x = 2

x match {
  case 1 | 2 | 3 => println('x is 1, 2, or 3')
  case _ => println('x is something else')
}

In the above code, the matching pattern 1 | 2 | 3 means that if the value of x is 1, 2, or 3, then the code block in the first case statement will be executed. If the value of x is not 1, 2, or 3, then the code block in the next case statement will be executed.

Besides using comma-separated multiple values, you can also use case Seq() to match against a sequence of multiple values. For example:

val x = List(1, 2, 3)

x match {
  case Seq(1, 2, 3) => println('x is a list of 1, 2, and 3')
  case _ => println('x is something else')
}

In the above code, the matching pattern Seq(1, 2, 3) means that if x is a list containing 1, 2, and 3, then the code block in the first case statement will be executed. If x is not such a list, then the code block in the next case statement will be executed.