On Fri, Oct 15, 2010 at 8:34 AM, Brendan Eich <bren...@mozilla.com> wrote: > On Oct 14, 2010, at 11:47 PM, Dominic Cooney wrote: > >> On the harmony:destructuring page >> <http://wiki.ecmascript.org/doku.php?id=harmony:destructuring> it >> specifies this syntax for patterns: >> >> Pattern ::= "{" (Field ("," Field)*)* "}" >> | "[" ((Pattern | LValue)? ",")* "]" >> Field ::= Identifier (":" (Pattern | LValue))? >> LValue ::= <any lvalue expression allowed in a normal assignment expression> >> >> Is it intentional that commas aren't required between fields of an >> object pattern, for example, {x y}? That seems concise, but odd. >> SpiderMonkey doesn't support this syntax. > > There is a comma (",") in the first EBNF production you cite from the wiki, > just after the meta-left-parenthesis: > >> Pattern ::= "{" (Field ("," Field)*)* "}"
Maybe I'm misreading it too, but I would expect that since the inner ("," Field)* can match the empty string "{" (Field )* "}" and therefore as Dominic says just have "{" Field Field Field "}" Mike _______________________________________________ es-discuss mailing list es-discuss@mozilla.org https://mail.mozilla.org/listinfo/es-discuss