fizzbuzz2.scala

  case class FizzBuzzRuleList[A]( rules: FizzBuzzRule[A]* ) {

    def map( x: A ): String =
      rules
        .find( _.pred( x ) )
        .map( _.value.apply() )
        .getOrElse( x.toString )
  }

  object FizzBuzzRuleList {
    def rule[A]( pred: A => Boolean, value: => String ): FizzBuzzRule[A] = 
      FizzBuzzRule[A]( pred, () => value )
  }
  import FizzBuzzRuleList._

  val fizzBuzzRules = FizzBuzzRuleList[Int](
    rule( x => x % 3 == 0 && x % 5 == 0, "FizzBuzz" ),
    rule( _ % 3 == 0, "Fizz" ),
    rule( _ % 5 == 0, "Buzz" )
  )
  
  val N = 100
  fizzbuzz( N )( fizzBuzzRules.map ).foreach( println )