import ChecksumAccumulator.calculate

 object Summer{
 def main(args: Array[String]): Unit= {

    for (arg <- args)
        println(arg + " : " +  calculate(arg))


 }

}

object ChecksumAccumulator {


/*
     When a singleton object shares the same name
     with a class, it is called that class's companion object.
*/

 private val cache = mutable.Map.empty[String, Int]


 def calculate(s: String): Int =

     if (cache.contains(s))
        cache(s)
     else {
         val acc = new ChecksumAccumulator

         //The object with the same name of the class can acces to the private members.
         //println(acc.sum)
         for (c <- s)
            acc.add(c.toByte)
         val cs = acc.checksum()
         cache += (s -> cs)
         cs
    }
 def showMap() : Unit = {
    for(base:String <- cache.keys)
        println(cache(base))

 }
//def showMap(): String = { var cadena = cache("Every value is an object.") +  " "+ cache("Every value is an object. per second time!!");  cadena  }