I have a method with an incoming variable, which represents a script.

e.g.

hello.groovy

Foo.init(this)

Foo.groovy

class Foo {
    static init(app) {

    }
}

What is the best way to add a ton of new functionality to the app variable in the init method? Basically, I would like to add all the functionality of another object to the app object.

For instance, if I had another class:

class Bar {
    def a() { }

    def b() {

    }
}

I would like the app object to basically be a new Bar(). In JavaScript, this is easy by using the prototype object, but I cannot seem to get it working in groovy. What is the best way to accomplish this? Or should I be doing something differently?