#daimonscala

gistfile1.sbt

class StringWithReverses(str: String) {
  def reverseOrder(): String = {
    var rev = new StringBuilder(str.length)
    (0 until str.length) foreach { (i) => rev.append(str.charAt(str.length-1-i)) }
    rev.toString()
  }
  
  def reverseCases(): String = {
    var rev = new StringBuilder(str.length)
    (0 until str.length) foreach { (i) => 
      str.charAt(i) match {
        case c if c.isLowerCase => rev.append(c.toUpperCase)
        case c if c.isUpperCase => rev.append(c.toLowerCase)
        case c => rev.append(c)
      }
    }
    rev.toString()
  }
}

implicit def convertToReversable(str: String) = new StringWithReverses(str)

"AbcDEf123".reverseOrder() // "321fEDcbA"
"AbcDEf123".reverseCases() // "aBCdeF123"