On 27/05/2011, at 12:24, Brendan Eich wrote:
> On May 27, 2011, at 2:36 AM, Jorge wrote:
>
>> Also, I wonder if in order to make blocks first class, do we need any new
>> syntax ?
>>
>> function f() {
>> a.forEach({ return 3 });
>
> The problem is that a block statement is ambiguous with an object
> initialiser. See
> http://wiki.ecmascript.org/doku.php?id=strawman:arrow_function_syntax#grammar_changes
> in particular the "To enable unparenthesized ObjectLiteral expressions as
> bodies of arrow functions, without ambiguity with Block bodies, restrict
> LabelledStatement as follows..." section.
As labels are seldom used in JS, perhaps the easiest way to avoid ambiguities
would be to forbid blocks from beginning with a label ?
Would it be too much (or too ugly) to require the programmer to disambiguate
(only) in this corner case ?
An object:
{ label: expression }
An error:
{ label: return 5 }
A block:
{ ; label: expression }
A block:
{ noLabelHere ... }
--
Jorge.
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