On Sep 17, 2012, at 12:37 PM, Luke Hoban wrote:
>
> These are good questions. Paul will be attending the TC39 meeting this week,
> and can likely talk to specific details. High level though, we statically
> eliminate the TDZ checks for references to 'let' within the same closure body
> as the declaration.
>
The other major check that I would expect to be significant, is whether a inner
function that references an outer TDZ binding is (potentially) called before
initialization of the binding. EG:
{
function f(){return x}
f(); //TDZ check of x in f can not be eliminated
let x=1;
}
{
function f(){return x}
let x=1; //TDZ check of x in f should be eliminated
f();
}
Allen
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