Scala 練習問題 #daimonscala

gistfile1.sbt

class StringSupport(s: String) {

  def reverseOrder: String = s.toList.foldLeft(Nil: List[Char])((result, c) => c :: result).mkString
 
  def reverseCase: String = s.toList.map { 
    case c if c.isUpper => c.toLower
    case c if c.isLower => c.toUpper
    case c => c
  }.mkString

}

object StringSupport {
  implicit def convert(s: String): StringSupport = new StringSupport(s)
}

import StringSupport._
println("AbcDEf123".reverseOrder)
println("AbcDEf123".reverseCase)