Brendan Eich (2014-06-06T00:52:47.000Z)
domenic at domenicdenicola.com (2014-06-10T19:23:02.125Z)
Rick Waldron wrote: > > > - `Object.preventUndeclaredGet()` - change an object's behavior to > > throw an error if you try to read from a property that doesn't > > exist (instead of returning `undefine`). > > > This can be achieved with Proxy right, or is that too cumbersome? ``` js> var NoSuchProperty = Proxy({}, { has: function(target, name) { return true; }, get: function(target, name, receiver) { if (name in Object.prototype) { return Object.prototype[name]; } throw new TypeError(name + " is not a defined property"); } }); js> var obj = Object.create(NoSuchProperty) js> obj.foo = 42 42 js> obj.foo 42 js> obj.bar /tmp/p.js:7:4 TypeError: bar is not a defined property ```