On 4 January 2012 17:39, Mark S. Miller <erig...@google.com> wrote: > Here's an interesting compromise I consider perfectly reasonable. We don't > *mandate* any ES6 code features be available in ES6 non-strict mode. But we > don't prohibit them either. For any ES6 features that have no dependence on > mode, like destructuring, we mandate that they be present in strict code, > and we make them normative optional (the new Appendix B category) in > non-strict code. Implementors are free to implement them or not in > non-strict mode, but if they implement them, it must mean the same thing as > the mandated meaning in strict code.
Hm, I don't understand what would be gained by that. You don't get rid of the spec complexity. And you risk reducing cross-browser compatibility, which is hardly a good thing. It doesn't really help the browser vendors either. I think for anything but legacy, we should avoid normative optional. >> - After Dave's posting I foresaw people wanting implicit opt-in with >> other constructs, e.g. classes or uses of `import' -- and voila, we're >> already there. But even with that, you still have to rely on explicit >> opt-in (via "use strict"?) for enabling some features elsewhere. As a >> result, we expect programmers to remember two separate, fairly random >> (for anybody not intimate with the history) lists of features that (1) >> require opt-in, and (2) imply opt-in. Style guides will probably >> suggest to put "use strict" on top of every Harmony program to escape >> the mess. > > Every sane style guide will do so. And every linting tool should by default > warn on the presence of any non-strict code. And every IDE should offer to > make the code strict if it isn't already. Well, I had hoped that with ES6 we have more elegant ways of opting into Harmony than something like the "use strict" kludge. I also thought that that was part of Dave's motivation. /Andreas _______________________________________________ es-discuss mailing list es-discuss@mozilla.org https://mail.mozilla.org/listinfo/es-discuss
