setgetters.js

MyClass = function() {
  this.foo = "foo"
};

MyClass.prototype = {
  set foo(v) {
    print("sorry, I don't wanna set foo with " + v);
  },
  get foo() {
    return "not really foo";
  }
}

obj = new MyClass();
print(obj.foo);
obj.foo = "bar";

/* Output is
 *  sorry, I don't wanna set foo with foo
 *  not really foo
 *  sorry, I don't wanna set foo with bar */