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
{
    prop object foo;

    constructor(object)
    {
        theObject := 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()
}