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 /be
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