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![Monadicプログラミングの効⽤用
Java⾵風
def validate(name: String, age: Int): ValidationNEL[Throwable, (String,
Int)] = {!
val a = v...](https://image.slidesharecdn.com/scalamaniacsrevised-121202073654-phpapp01/75/Scala-20-2048.jpg?cb=1666685876)
![Scala (関数型プログラミング)
def validate(name: String, age: Int):
ValidationNEL[Throwable, (String, Int)] = { !
validateName(name...](https://image.slidesharecdn.com/scalamaniacsrevised-121202073654-phpapp01/75/Scala-21-2048.jpg?cb=1666685876)
![パイプラインの構成部品
メソッド メソッド動作 動作イメージ コンテナ型 要素型 要素数
map コンテナ内の要素に M[A]→M[B] 変わらない 変わる 同...](https://image.slidesharecdn.com/scalamaniacsrevised-121202073654-phpapp01/75/Scala-25-2048.jpg?cb=1666685876)
![楽々プログラミング
def main(args: Array[String]) {
records |> build部⾨門 >>> buildTree >>> showTree
}
def build部⾨門(records: Seq...](https://image.slidesharecdn.com/scalamaniacsrevised-121202073654-phpapp01/75/Scala-36-2048.jpg?cb=1666685876)
: (T, Long) = {
val start = System.cur...](https://image.slidesharecdn.com/scalamaniacsrevised-121202073654-phpapp01/75/Scala-39-2048.jpg?cb=1666685876)
![PromiseのKleisli
scala> val fp = f.promise
fp: scalaz.Kleisli[scalaz.concurrent.Promise,Int,Int] =
scalaz.Kleislis$$anon$...](https://image.slidesharecdn.com/scalamaniacsrevised-121202073654-phpapp01/75/Scala-40-2048.jpg?cb=1666685876)
![scala> go(List(1, 2, 3).map(fp).map(_.flatMap(fp)).sequence.get)
res220: (List[Int], Long) = (List(1, 2, 3),602)
...](https://image.slidesharecdn.com/scalamaniacsrevised-121202073654-phpapp01/75/Scala-41-2048.jpg?cb=1666685876)
![scala> go(List(1, 2, 3).map(fp).map(_.flatMap(fxp)).sequence.get)
res222: (List[Int], Long) = (List(1, 2, 3),402)
...](https://image.slidesharecdn.com/scalamaniacsrevised-121202073654-phpapp01/75/Scala-42-2048.jpg?cb=1666685876)
