There was a suggestion for CoffeeScript, which got implemented by Coco<http://satyr.github.com/cup/#c:%7B+enumerable,%20-configurable,%20+writable%7D>, for `{+enumerable, -configurable, +writable}` syntax that does that. It has the same potential ambiguity, but looks better IMO.
On Thu, Jan 5, 2012 at 9:29 AM, Herby Vojčík <he...@mailbox.sk> wrote: > Hello, > > sorry that I did not get it from the beginning. > You are right. > I am really concerned about use of boolean shortcuts in the context of > object initializer. > But François's examples scared me. > Especially the impossibility of `{ !window }.callFunc();` kind of > statements. > But in such case, early error should tell me I am in the wrong way and > people are accepting that this kind of construct need parentheses to > disambiguate (especially for the ({}).foo case). > > So I would make the proposal alive again, but the thread got cluttered. :-/ > > Thanks again for showing me not to panic, > > > Herby > > -----Pôvodná správa----- From: Mike Samuel > Sent: Wednesday, January 04, 2012 6:29 PM > To: Herby Vojčík > Cc: François REMY ; es-discuss@mozilla.org > Subject: Re: Boolean shortcuts > > 2012/1/4 Herby Vojčík <he...@mailbox.sk>: > >> Curse that eval-uation of a code block! This prevents not only this, but a >> lot of more possible enhancements/reforms! >> > > I don't see the problem. You are proposing a change to the > ObjectInitialiser production. Francois's example just demonstrates > something we already know -- that there exist strings that will parse > as an ObjectInitialiser when you start in the Expression production > but parse as a Block when you start in the Program production. > > eval('{ !window }') is and would remain a block, and eval('({ !window > })') with your proposal would be unambiguously an object initialiser, > and is a SyntaxError in ES5. > ______________________________**_________________ > es-discuss mailing list > es-discuss@mozilla.org > https://mail.mozilla.org/**listinfo/es-discuss<https://mail.mozilla.org/listinfo/es-discuss> > -- <me><name>Nadav Ivgi</name><profession>Software Developer</profession><phone>+972-50-3650394</phone><blog> http://www.shesek.info/</blog><timezone>GMT +2</timezone></me>
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