As an interesting aside, I just wanted to highlight the section of Promises/A+ that Rick was referring to, because I think it uses a rather clever trick to avoid discussing the event loop while still requiring the behavior we want:
"onFulfilled and onRejected must not be called before then returns [1]." This trick is borrowed from Kris Kowal's UncommonJS promises specification. > -----Original Message----- > From: [email protected] [mailto:es-discuss- > [email protected]] On Behalf Of David Bruant > Sent: Tuesday, November 6, 2012 14:43 > To: Rick Waldron > Cc: EcmaScript > Subject: Re: Promises > > Le 06/11/2012 20:35, Rick Waldron a écrit : > > Based on a read through of > > https://github.com/promises-aplus/promises-spec, these things > > initially come to mind, please regard as a loose collection of varying > > thoughts that may or may not be completely relevant: > > > > 1. The definition of a "promise" is really just a plain object or > > function with an expando property, I would think that a language level > > addition would require its own standard built-in object: Promise, > > which when invoked as a constructor initializes a new promise object > > which has a "then" method... Domenic has it covered from there. > I fully agree. > > > 2. The notes describe some excellent practical implementation points, > > but none of them are actually part of the ECMAScript standard, eg. > > setTimeout, process.nextTick. Should these be specified or left > > unspecified? Object.observe describes delivery as "Schedule change > > events to be delivered asynchronously 'at the end of the turn'", which > > is not very specific. > As I suggested, Object.observe opens the breach and I think it means the > event loop (including the notion of "turn") will have to be fully specified > within > ECMAScript. > > > 3. Does this belong in the language or would it make more sense to > > exist as a "standard module"? > Are you referring to the event loop or promises? > event loop : the language > promises : arguably standard module > > David > _______________________________________________ > 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
