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
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