Comments (2)
The Promises/A+ then
method does not support fulfilling with thenables (when returning them from the then
callback`). This spec does not say anything about the constructor, it doesn't answer your question.
You can do either. You should decide whether the callback in your constructor is a resolve
or a fulfill
. You got three choices:
- It fulfills the promise with the passed value. In that case
final
should be logging thepromise2
. - It resolves the promise, using thenable assimilation. In that case
final
should be logging5
. - It resolves the promise by adopting the passed promise. In that case
final
should reject, becausepromise1
andpromise2
are rejected promises, because5
was not a valid promise.
from promises-spec.
I'm pretty sure promise1
should resolve to the value 5, but otherwise thank you. I have chosen to call then() in the constructor (without that final
would resolve to promise2
in my implementation)
Note that it passes all tests in the tests repo either way (it's inspired by RWPromises)
from promises-spec.
Related Issues (20)
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from promises-spec.