Nicholas C. Zakas wrote:
It can be done with Proxy, but that kind of sucks because I always
need to go through the extra step of creating the Proxy for each
object and passing around the Proxy instead. To me, this is similar to
setting a property to be readonly in strict mode, except its writeonly
(or rather, write-first).
What about the code I showed, which shows a singleton being spliced high
on many objects' prototype chains to handle the missing property throw?
js> var NoSuchProperty = Proxy({}, {
has: function(target, name) { return true; },
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");
}
});
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
You could avoid Object.create by assigning to a Constructor.prototype,
or hacking with __proto__, of course.
/be
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