• Constructor patterns
• Sequence patterns
• Tuple patterns
• Typed patterns

今天繼續來介紹其餘的pattern matching

Constructor patterns（建構式模式）

Constuctor pattern讓我們可以比對建構式，把建構式放到match運算式裡的case語句。

case class Dog(name: String, age: Int)

def test(x: Any) = x match 
    case Dog("Tom", 4) => "Tom is four years old."
    case _ => " "

Sequence patterns（序列模式）

Sequence pattern讓我們可以依據List, Array, Vector來比對模式
底線符號(_)代表一個元素
_*代表0個或多個元素

def test(x: Any) = x match
    case List(1) => "1"
    case List(1, 2, 3) => "1 2 3"
    case List(1, 2, _) => "1 2 and the other"
    case List(1, _*) => "starts with 1, any number of elements"

Tuple patterns（元組模式）

可以比對元組

def Tupletest(x: Any) = 
    x match
        case (a, b, c) => "matched"
        case _ => ""

Typed patterns

def test(x: Any) = 
    x match
        case s: String => s"String: $s"
        case i: Int => s"Int: $i"