Figured it out: This is needed for “locking in”.

Quoting [1]:

> A promise is _resolved_ if it is settled or if it has been "locked in" to match the state of another promise. Attempting to resolve or reject a resolved promise has no effect.

[1] https://people.mozilla.org/~jorendorff/es6-draft.html#sec-promise-objects



On Sep 25, 2014, at 6:49 , Axel Rauschmayer <axel at rauschma.de> wrote:

> https://people.mozilla.org/~jorendorff/es6-draft.html#sec-createresolvingfunctions
> 
> Each resolving function R uses R.[[AlreadyResolved]].[[value]] to prevent the same promise from being resolved twice.
> 
> Question: Couldn’t R.[[Promise]].[[PromiseState]] be used, instead?

-- 
Dr. Axel Rauschmayer
axel at rauschma.de
rauschma.de



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Figured it out: This is needed for “locking in”.

Quoting [1]:

> A promise is _resolved_ if it is settled or if it has been "locked in" to match the state of another promise. Attempting to resolve or reject a resolved promise has no effect.

[1]: https://people.mozilla.org/~jorendorff/es6-draft.html#sec-promise-objects