michael@0: // adding assignment + watchpoint vs. caching
michael@0: var hits = 0;
michael@0: var obj = {};
michael@0: obj.watch("x", function (id, oldval, newval) { hits++; return newval; });
michael@0: for (var i = 0; i < 10; i++) {
michael@0:     obj.x = 1;
michael@0:     delete obj.x;
michael@0: }
michael@0: assertEq(hits, 10);