ScalaNoob - ProgFun Week1

Balance.scala

  def balance(chars: List[Char]): Boolean = {
    val result:(Boolean, Int) = chars.foldLeft((true, 0))((tuple:(Boolean, Int), char:Char) => {
      val count = balanceCount(tuple._2, char)
      (tuple._1 && count >= 0, count)
    })
    result._1 && result._2 == 0
  }

  private def balanceCount(previousCount: Int, char: Char) : Int = {
    char match {
      case '(' => previousCount+1
      case ')' => previousCount-1
      case _ => previousCount
    }
  }