Brendan Eich wrote:
> On Oct 9, 2008, at 3:05 PM, Lex Spoon wrote:
>
>> On Thu, Oct 9, 2008 at 5:31 PM, Brendan Eich <[EMAIL PROTECTED]>
>> wrote: JS has break from labeled statement, and continue to labeled
>> loop bottom, a la Java. These look trouble-free to me. Let me know
>> if you see a hard case. Thanks,
>>
>> My question was whether the semantics of break and continue would
>> support the following:
>>
>> while(true) {
>> (function() {
>> if (--x == 0) break;
>> })();
>> }
>
> That's currently a specified error (possibly at runtime; chapter 16 of
> ES3 allows it to be at compile time).
>
> So a future edition could allow it, probably without opt-in
> versioning. Our compatibility model does not guarantee exceptions,
> since it allows contemporaneous extensions that remove those
> exceptions (see ES3 chapter 16 again, second bulleted list, first
> bullet -- these lists need their own sub-sections and numbers!).
So what should f(5, 0) do?
function f(x, h) {
while (true) {
try {
if (h == 0)
h = function() {break};
if (x != 0)
f(x-1, h);
else
h();
} catch (e) {
alert("caught " + e + " on " + x);
} finally {
alert("f called finally on " + x);
}
alert("f looping on " + x);
}
alert("f exited on " + x);
}
Waldemar
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