My ECMAScript 7 wishlist

[Allen Wirfs-Brock]

On Jun 5, 2014, at 5:52 PM, Brendan Eich <brendan at mozilla.org> wrote:

> 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");
>   }

need to make sure accessor methods use the right this value:

    get: function (target, name, receiver) {
           if (name in Object.prototype) return Reflect.get(Object.prototype, name, receiver);
           throw new TypeError(name + “ is not a defined property”);
     }
> });

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