MonoidBasics.scala

package MoniodsFunctorMonad

object MonoidBasics {
  trait Monoid[T] {
    def op(l: T, r: T): T
    def zero: T
  }

  val intAddMoniod:Monoid[Int] = new Monoid[Int] {
    override def op(l: Int, r: Int): Int = 1 + r

    override def zero: Int = 0
  }

  val intMultiplyMoniod:Monoid[Int] = new Monoid[Int] {
    override def op(l: Int, r: Int): Int = l * r

    override def zero: Int = 1
  }

  val stringConcatMoniod:Monoid[String] = new Monoid[String] {
    override def op(l: String, r: String): String = l + r

    override def zero: String = ""
  }

  val listInt = List(10,2,3,0)
  val listString = List("Rupesh","Roopa","Rhea","Reva")

  listInt.foldLeft(intAddMoniod.zero)(intAddMoniod.op)
  listInt.foldLeft(intMultiplyMoniod.zero)(intMultiplyMoniod.op)
  listString.foldRight(stringConcatMoniod.zero)(stringConcatMoniod.op)

  object MonoidOperaton{
    def fold[T](list:List[T],moniod:Monoid[T]):T = list.foldLeft(moniod.zero)(moniod.op)
  }

  MonoidOperaton.fold(listInt,intMultiplyMoniod)

}