Section 35 Want more of a challenge? View in iconic form (experimental)

---

       # OBJECT an example object -- a 2D point
[hear] (define point
         (lambda (x y)
           (reflective
            (lambda (self msg)
              (cond ((= (msg) x) (x))
                ((= (msg) y) (y))
                ((= (msg) point) (self))
                ((= (msg) +)
                 (lambda ((p point))
               (point (+ (x) (p x))
                      (+ (y) (p y)))))
                ((= (msg) =)
                 (lambda ((p point))
               (and (= (x) (p x))
                    (= (y) (p y)))))
                0)))));

[hear] (define point1 (point 1 11));

[hear] (define point2 (point 2 22));

[hear] (= 1 (point1 x));

[hear] (= 22 (point2 y));

[hear] (= 11 ((point 11 12) x));

[hear] (= 11 (((point 11 12) point) x));

[hear] (= 16 (((point 16 17) point) x));

[hear] (= 33 (point1 + (point2) y));

[hear] (point1 + (point2) = (point 3 33));

[hear] (point2 + (point1) = (point 3 33));

[hear] ((point 100 200) + (point 200 100) = (point 300 300));

[hear] (instanceof point (point1));

[hear] (not (instanceof int (point1)));

[hear] (instanceof int 5);

[hear] (not (instanceof point 5));