Marius Gundersen wrote:
I don't see how wellLabeledStatement will protect against object
literals with shorthand properties, like (x, y, z) => {x, y, z}.
The solution to the block vs object problem today is to wrap the object
in parenthesis, but not the block. The only alternative that is easy for
humans to understand and not ambiguous for machines is to wrap or prefix
the block, but not the object, for example with do:
x => do {
let a = 5;
return a*x;
}
Yeah, this is good.
Even if do expression won't get in, if one could clearly tell the intent
(block vs. expression), it would make things easier to work with.
=> expr / => do block is less ambiguous then => expr / [nothing] block I
posted earlier.
AFAIK do expressions are not in ES6, but might be in ES7.
Marius Gundersen
On 6 Jan 2015 19:42, "Brendan Eich" <bren...@mozilla.org
<mailto:bren...@mozilla.org>> wrote:
Sorry, sent too soon.
Dean Landolt wrote:
If it's too late to properly vet a change which narrowly
excludes from arrow bodies any `LabeledStatement` that isn't a
`WellLabeledStatement`, would it be feasible to simply exclude
any `LabeledStatement` for now? I doubt there's much code in the
wild that would be affected by this change -- certainly not yet.
That'd buy plenty of time to add back proper support for
`WellLabeledStatement` arrow bodies in es7.
The ES6 grammar has not been refactored per my old strawman. It has
no WellLabeledStatement non-terminal.
For ES6, we would need another production parameter to FunctionBody,
FunctionStatementList, and StatementList (at least) by which to
restrict a ConciseBody : { FunctionBody } such that the FunctionBody
: FunctionStatementList (via FunctionStatementList :
StatementList[opt], StatementList StatementListItem, etc.) doesn't
start with a LabelledStatement.
Cc'ing Allen and Waldemar for their thoughts.
/be
_________________________________________________
es-discuss mailing list
es-discuss@mozilla.org <mailto:es-discuss@mozilla.org>
https://mail.mozilla.org/__listinfo/es-discuss
<https://mail.mozilla.org/listinfo/es-discuss>
_______________________________________________
es-discuss mailing list
es-discuss@mozilla.org
https://mail.mozilla.org/listinfo/es-discuss
_______________________________________________
es-discuss mailing list
es-discuss@mozilla.org
https://mail.mozilla.org/listinfo/es-discuss
