Really awesome if we could have this feature. On Sat, Mar 21, 2015 at 4:04 AM, Brendan Eich <[email protected]> wrote:
> But we could extend the cover grammar with some work. You'd have to push > ArrayLiteral and ObjectLiteral down from PrimaryExpression alternative > right-hand sides, to live under > CoverParenthesizedExpressionAndArrowParameterList.Seems > do-able -- anyone see a fatal problem? Could be an ES7 relaxation from ES6, > if it matters enough to users. > > /be > > Rick Waldron wrote: > >> Inline... >> >> >> On Thu, Mar 19, 2015 at 4:50 PM Jan-Ivar Bruaroey <[email protected] >> <mailto:[email protected]>> wrote: >> >> Hi group! First post, so be gentle. >> >> >> Welcome >> >> >> I love how arrow functions allow single arguments to be passed without >> parenthesis, so I expected this to work: >> >> Promise.all([true, false]).then([foo, bar] => console.log(foo +”, >> "+ bar)); >> >> but it doesn't: >> >> SyntaxError: invalid arrow-function arguments (parentheses around >> the arrow-function may help) >> >> I understand from the spec that this is as defined, but is there a >> technical reason to disallow it? >> >> >> To prevent ambiguity with: >> >> MemberExpressionArguments >> CallExpressionArguments >> >> >> Arguments[Yield] : >> |(| |)| >> |(| ArgumentList[?Yield] |)| >> ArgumentList[Yield] : >> AssignmentExpression[In, ?Yield] >> |...| AssignmentExpression[In, ?Yield] >> ArgumentList[?Yield] |,| AssignmentExpression[In, ?Yield] >> ArgumentList[?Yield] |,| |...| AssignmentExpression[In, ?Yield] >> >> >> e.g. >> >> fn([a, b]) >> >> Rick >> >> >> The parenthesis seem redundant to the naked eye. >> >> Thanks, >> >> .: Jan-Ivar :. >> >> _______________________________________________ >> es-discuss mailing list >> [email protected] <mailto:[email protected]> >> https://mail.mozilla.org/listinfo/es-discuss >> >> _______________________________________________ >> es-discuss mailing list >> [email protected] >> https://mail.mozilla.org/listinfo/es-discuss >> > _______________________________________________ > es-discuss mailing list > [email protected] > https://mail.mozilla.org/listinfo/es-discuss >
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