575 Thingy.observe = function(thingy, callback) {  argument
576   Object.observe(thingy, callback, [Thingy.INCREMENT,
582 Thingy.unobserve = function(thingy, callback) {  argument
583   Object.unobserve(thingy);
586 var thingy = new Thingy(2, 4);  variable
588 Object.observe(thingy, observer.callback);
589 Thingy.observe(thingy, observer2.callback);
590 thingy.increment(3);               // { a: 5, b: 7 }
591 thingy.b++;                        // { a: 5, b: 8 }
592 thingy.multiply(2);                // { a: 10, b: 16 }
593 thingy.a++;                        // { a: 11, b: 16 }
594 thingy.incrementAndMultiply(2, 2); // { a: 26, b: 36 }
599   { object: thingy, type: 'update', name: 'a', oldValue: 2 },
600   { object: thingy, type: 'update', name: 'b', oldValue: 4 },
601   { object: thingy, type: 'update', name: 'b', oldValue: 7 },
602   { object: thingy, type: 'update', name: 'a', oldValue: 5 },
603   { object: thingy, type: 'update', name: 'b', oldValue: 8 },
604   { object: thingy, type: 'update', name: 'a', oldValue: 10 },
605   { object: thingy, type: 'update', name: 'a', oldValue: 11 },
606   { object: thingy, type: 'update', name: 'b', oldValue: 16 },
607   { object: thingy, type: 'update', name: 'a', oldValue: 13 },
608   { object: thingy, type: 'update', name: 'b', oldValue: 18 },
611   { object: thingy, type: Thingy.INCREMENT, incremented: 3 },
612   { object: thingy, type: 'update', name: 'b', oldValue: 7 },
613   { object: thingy, type: Thingy.MULTIPLY, multiplied: 2 },
614   { object: thingy, type: 'update', name: 'a', oldValue: 10 },
616     object: thingy,
713 RecursiveThingy.observe = function(thingy, callback) {  argument
714   Object.observe(thingy, callback, [RecursiveThingy.MULTIPLY_FIRST_N]);
717 RecursiveThingy.unobserve = function(thingy, callback) {  argument
718   Object.unobserve(thingy);
721 var thingy = new RecursiveThingy;  variable
722 thingy.push(1, 2, 3, 4);
724 Object.observe(thingy, observer.callback);
725 RecursiveThingy.observe(thingy, observer2.callback);
726 thingy.multiplyFirstN(2, 3);                // [2, 4, 6, 4]
731   { object: thingy, type: 'update', name: '2', oldValue: 3 },
732   { object: thingy, type: 'update', name: '1', oldValue: 2 },
733   { object: thingy, type: 'update', name: '0', oldValue: 1 }
736   { object: thingy, type: RecursiveThingy.MULTIPLY_FIRST_N, multiplied: 2, n: 3 }
771 DeckSuit.observe = function(thingy, callback) {  argument
772   Object.observe(thingy, callback, [DeckSuit.SHUFFLE]);
775 DeckSuit.unobserve = function(thingy, callback) {  argument
776   Object.unobserve(thingy);