Le 20/01/2013 16:49, Kevin Smith a écrit :
Got it. And one more (thanks for bearing with me)
I forked the thread. Go crazy if you have other questions :-)
what affect does throwing an error have within a trap?
You can think of it as an internal error, very much like
Object.defineProperty throws a TypeError when the first argument isn't
an object.
var target = {
foo: function() { this.bar; console.log("after bar"); },
bar: 0
};
var proxy = new Proxy(target, {
get: function(obj, name) {
if (name === "bar") throw new Error("boom");
return obj[name];
}
});
proxy.foo();
Does the stack unwind as with normal error handling? Does "after bar"
get logged? (FF18 answers yes to the first and no to the second
question.)
I agree with FF18 here.
This case is relatively easy and the get trap is supported by Firefox
implementation, but always aware that for now, some traps aren't
implemented, some invariant-related checks aren't performed, other are
overly performed. You can see the known issues in the dependency tree of
the direct proxy bug:
https://bugzilla.mozilla.org/showdependencytree.cgi?id=703537&hide_resolved=1
David
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