onPatches(obj, handler, [queueName])

Register an event handler on the object obj that fires when anything changes on an object: a key value is added, an existing key has is value changed, or a key is deleted from the object.

If object is an array-like and the changed property includes numeric indexes, patch sets will include array-specific patches in addition to object-style patches

For more on the patch formats, see diff-object and diff-array.

var obj = new DefineMap({});
var handler = function(patches) {
    console.log(patches);
};

canReflect.onPatches(obj, handler);
obj.set("foo", "bar");  // logs [{ type: "add", property: "foo", value: "bar" }]
obj.set("foo", "baz");  // logs [{ type: "set", property: "foo", value: "baz" }]

var arr = new DefineList([]);
canReflect.onPatches(arr, handler);
arr.push("foo");  // logs [{type: "add", property:"0", value: "foo"},
                           {index: 0, deleteCount: 0, insert: ["foo"]}]
arr.pop();  // logs [{type: "remove", property:"0"},
                           {index: 0, deleteCount: 1, insert: []}]