implicit.scala

object Main {
  implicit def extendString(string:String) = new MyString(string)
  
  def main(args: Array[String]) :Unit = {
    val testValue = "1000";
    println(testValue.getClass().getName()) // prints java.lang.String
    println(testValue.isNumeric)            // prints true
    println(testValue.lastIndexOf("0"))     // prints 3
    println(testValue.getClass().getName()) // prints java.lang.String
  }

  class MyString(string:String){
    def isNumeric = string.matches("-?\\d+(.\\d+)?")
    def lastIndexOf(value:String) = 666
  }
}