Scala Generics Worksheet

scalaPractice.sc

object scalaPractice {

  def squareAddOne[T](x: T)
    (implicit numeric: Numeric[T]): T = {
    import numeric._

    x*x + one
  }
  squareAddOne(3)

  def squareAddOne2[T: Numeric](x: T): T = {
    val numeric = implicitly[Numeric[T]]
    import numeric._

    x*x + fromInt(1)
  }
  squareAddOne2(4)

  def squareAddThirty[T: Numeric](x: T): T = {
    import Numeric.Implicits._ // allows us to use * on type T
    val numeric = implicitly[Numeric[T]] // gives us numeric.fromInt

    x*x + numeric.fromInt(30)
  }
  squareAddThirty(5)

}