RosettaCodeData/Task/Add-a-variable-to-a-class-instance-at-runtime/Elena/add-a-variable-to-a-class-instance-at-runtime.elena

import extensions;

class Extender : BaseExtender
{
   object foo : prop;

   constructor(object)
   {
      this object := object
   }
}

public program()
{
   var object := 234;

   // extending an object with a field
   object := new Extender(object);

   object.foo := "bar";

   Console.printLine(object,".foo=",object.foo);

   Console.readChar()
}