On Sun, May 27, 2012 at 4:41 PM, Brendan Eich <[email protected]> wrote: > John J Barton wrote: >> >> On Thu, May 24, 2012 at 11:10 AM, Brendan Eich<[email protected]> >> wrote: >>> >>> David Bruant wrote: >>> >>>> Once we're at it, for the sake of completeness there is probably no harm >>>> in adding a Reflect.setPrototype at this point, is there? >>> >>> There is, just as there's a cost to Object.setPrototypeOf (the obvious >>> place >>> to put it to match Object.getPrototypeOf from ES5). Mark pointed out that >>> he'd have to delete that static method too, and from every frame that >>> might >>> run SES code. But when mashing up SES and non-SES code, it would be >>> better >>> not to break the non-SES code by such deletion. >>> >>> Having only the SES environment's Object.prototype.__proto__ to delete is >>> better. >> >> >> How is this this line of reasoning -- which I read as 'support for >> SES-environments and non-SES-environments' -- not violating 1JS? > > > How about you say how it violates 1JS instead of asking me to prove a > negative?
I wasn't asking for a proof. I was just asking a question. > > 1JS is about no explicit version > number/MIME-type-parameter/pragma/other-designator opt-in. Nothing to do > with goal #5 at > http://wiki.ecmascript.org/doku.php?id=harmony:harmony#goals, which is about > a different language, SES, that must map efficiently to ES6 and up (and > almost does to ES5). > > Subset and other transpiled language != version opt-in mandated to use ES6 > in the main language. The reason I asked is that "use strict" seems to be a subset but acts like another version in some cases. In particular, if a library uses obj.freeze() and the caller modifies the object by adding a property, the caller gets no error message. (You'll have to read the source of the library to figure it out.) The library is, for this purpose, operating in a language where object modification is an error but the caller is not. If 'mashing up' is similar to 'using objects from a library', then isn't JS-mashed-with-SES (whatever that means) a different version of JS? jjb > > /be _______________________________________________ es-discuss mailing list [email protected] https://mail.mozilla.org/listinfo/es-discuss
