第7章：タプルにチャレンジ！ ref: http://qiita.com/f81@github/items/a8419532c316d190782d

CaseClassTuple.scala

object CaseClassTuple {

  def get() = {
    val name = new Name("清美", "椿山")
    (Human(name, 15), name)
  }

  def main(args: Array[String]){
    val tuple = get()
    printf("fullname_1=%s \n", tuple._1.name.fullname)
    printf("fullname_2=%s \n", tuple._2.fullname)
  }

}

class Name(first: String, last: String) {
  def fullname() = first + " " + last
}

case class Human(name: Name, age: Int)

file1.txt

$ scalac Tuple.scala

$ scala Tuple
max=10
index=5

file11.txt

$ scalac Func23.scala
Func23.scala:3: error: type Function23 is not a member of package scala
    val func23 : (Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int) => Int = null;
                                                 ^
one error found

file13.txt

$ scalac CaseClassTuple.scala

$ scala CaseClassTuple
fullname_1=清美 椿山
fullname_2=清美 椿山

file15.txt

$ scalac TupleImmutable.scala
TupleImmutable.scala:9: error: reassignment to val
tuple._1 = 3
         ^
one error found

file2.txt

val max = numbers.max
val index = numbers.indexOf(max)

file3.txt

val maxValue = getMaxValue(numbers)
printf("max=%s \n", maxValue._1)
printf("index=%s \n", maxValue._2)

file5.txt

$ scalac Tuple22.scala

$ scala Tuple22
element_1=1
element_22=22

file7.txt

$ scalac Tuple23.scala
Tuple23.scala:4: error: object Tuple23 is not a member of package scala
      (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
      ^
one error found

file9.txt

scalac Func22.scala

Func22.scala

object Func22 {
  def main(args: Array[String]) {
    val func22 : (Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int) => Int = null;
  }
}

Func23.scala

object Func23 {
  def main(args: Array[String]) {
    val func23 : (Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int) => Int = null;
  }
}

Tuple.scala

object Tuple {

  def getMaxValue(numbers: List[Int]) = {
    val max = numbers.max
    val index = numbers.indexOf(max)
    (max, index)
  }

  def main(args: Array[String]){
    val numbers = List(1, 2, 3, 4, 5, 10, 6)

    val maxValue = getMaxValue(numbers)
    printf("max=%s \n", maxValue._1)
    printf("index=%s \n", maxValue._2)
  }

}

Tuple22.scala

object Tuple22 {

  def get() = {
    (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
  }

  def main(args: Array[String]){
    val tuple = get()
    printf("element_1=%s \n", tuple._1)
    printf("element_22=%s \n", tuple._22)
  }

}

Tuple23.scala

object Tuple23 {

  def get() = {
    (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
  }

  def main(args: Array[String]){
    val tuple = get()
    printf("element_1=%s \n", tuple._1)
    printf("element_23=%s \n", tuple._23)
  }

}

TupleImmutable.scala

object TupleImmutable {

  def get(x1: Int, x2: Int) = {
    (x1, x2)
  }

  def main(args: Array[String]){
    val tuple = get(1, 2)
    tuple._1 = 3
  }

}