Direct ProxiesでObject.observeの Polyfillはできるのか

Transcript

1. Direct ProxiesͰObject.observeͷ Polyfill͸Ͱ͖Δͷ͔
3. Object.observe Object.observe(obj, (changes) => { // do something
 }); • objΛมߋ͢Δͱhandlerؔ਺͕ݺ͹ΕΔ
4. Direct Proxies var proxy = new Proxy(obj, {
 set(target, name, val, receiver) { // do something
 } }); • objΛҾ਺ͱͯ͠৽ͨͳ୅ཧΦϒδΣΫτʢproxyʣΛಘΔ • proxyΛૢ࡞ͨ࣌͠ʹhandler͕ݺ͹ΕΔ • objΛૢ࡞ͯ͠΋handler͸ݺ͹Εͳ͍
5. ͜ͷAPIΛPolyfill͢Δ ͷ͸ແཧͰ͸ɾɾʁ Object.observe(obj, (changes) => { // do something
 });
6. ProxyͷPolyfillϥΠϒϥϦ
8. harmony-reflect/examples/observer.js
9. ͍͚ͦ͏ʂʂ
10. ͳΜ͔ΤϥΔɾɾ // Firefox 36.0 Observer(Object); // enable polyfill var obj = {}; Object.observe(obj, handler); //=> uncaught exception: can only get notifier of observable objects, given [object Object]
11. ͜͏͢Δඞཁ͕͋ΔΒ͍͠ var obj = {}; var o = Object.createObservable(obj); Object.observe(o, handler);
12. Q: Direct ProxiesͰObject.observeͷ Polyfill͸Ͱ͖Δͷ͔
13. A:ʢͨͿΜʣແཧ
14. ͋Γ͕ͱ͏͍͟͝·ͨ͠ɻ