Functions को Values की तरह उपयोग करना

object Main {
  def main(args: Array[String]): Unit = {
    val increment: Int => Int = x => x + 1
    println(increment(5))
  }
}

object Main {
  def main(args: Array[String]): Unit = {
    val add: (Int, Int) => Int = (a, b) => a + b
    val label: Int => String = n => s"value=$n"
    println(add(3, 4))
    println(label(7))
  }
}

object Main {
  def main(args: Array[String]): Unit = {
    val square = (x: Int) => x * x
    println(square(6))
  }
}

object Main {
  def applyTwice(f: Int => Int, x: Int): Int = f(f(x))
  def main(args: Array[String]): Unit = {
    println(applyTwice(_ + 3, 10))
  }
}

object Main {
  def main(args: Array[String]): Unit = {
    val triple = (x: Int) => x * 3
    println(List(1, 2, 3).map(triple))
    println(List(1, 2, 3).map(x => x * 3))
  }
}

object Main {
  def multiplier(factor: Int): Int => Int = x => x * factor
  def main(args: Array[String]): Unit = {
    val timesTen = multiplier(10)
    println(timesTen(5))
  }
}

object Main {
  def doubleIt(x: Int): Int = x * 2
  def main(args: Array[String]): Unit = {
    val f: Int => Int = doubleIt
    println(f(8))
    println(List(1, 2, 3).map(doubleIt))
  }
}

object Main {
  def main(args: Array[String]): Unit = {
    val greeting: () => String = () => "Hello!"
    println(greeting())
  }
}

object Main {
  def main(args: Array[String]): Unit = {
    val ops: Map[String, (Int, Int) => Int] = Map(
      "add" -> (_ + _),
      "mul" -> (_ * _)
    )
    println(ops("add")(3, 4))
    println(ops("mul")(3, 4))
  }
}

object Main {
  def transformAll(xs: List[Int], f: Int => Int): List[Int] = xs.map(f)
  def main(args: Array[String]): Unit = {
    println(transformAll(List(1, 2, 3), _ + 100))
    println(transformAll(List(1, 2, 3), _ * 10))
  }
}

object Main {
  def transformAll(xs: List[Int], f: Int => Int): List[Int] = xs.map(f)
  def main(args: Array[String]): Unit = {
    println(transformAll(List(1, 2, 3), x => x + 100))
    println(transformAll(List(1, 2, 3), x => x * x))
  }
}