On Jul 10, 2008, at 1:28 PM, Mark S. Miller wrote:
On Thu, Jul 10, 2008 at 11:05 AM, Brendan Eich
<[EMAIL PROTECTED]> wrote:
So what would this program print in ES3.1?
const C = 42;
function f(x, y) {
const C = 33;
if (x) {
const C = 21;
return eval(y);
}
return C;
}
print(f(true, "C"));
21
What does it print in ES4-opt-in?
Call it ES4, please. There's no point in playing games about opt-in,
since we know we can't "break the web". ES3 added new syntax, so did
ES2. No one bugged out about "opt-in".
21 is the right answer, although reflecting lexical blocks into
something eval can see is a big pain (we did this in Firefox 2). It's
a lot of work just for block-scoped const. Sorry if I missed the
discussion, but was restricting const to top level considered?
/be
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