How to check Promise's current state?

Question

I need to check for debugging purposes if a promise is already resolved - something like p.isResolved(). Is there anyway to do this?

Promise.state ? https://developer.mozilla.org/en-US/docs/Mozilla/JavaScript_code_modules/Promise.jsm/Promise — shershen, Jul 21 '15 at 08:52

score 4 · Answer 1 · answered Jul 21 '15 at 08:58

4

Trigger a log when it is resolved or emit a event if you want it be handled somewhere else:

triggerMyPromiseMethod()
    .then((response) => {
        console.log('Promise resolved', response)

        // continue...
    })
    .catch((err) => {
        console.log('Something went wrong with my Promise', err)
    })

answered Jul 21 '15 at 08:58

Claudio Bredfeldt

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agreed with @Claudio Bredfeldt the only way to debug your code is by using logs .. – Akriti Agarwal Jul 21 '15 at 09:01
So I understand by your answer that there's no way to check Promise's state outside of the promise context, right? – someone235 Jul 21 '15 at 09:17
2

"By design, the instant state and value of a promise cannot be inspected synchronously from code, without calling the then() method.", MDN Promise Documentation – Claudio Bredfeldt Jul 21 '15 at 09:23

How to check Promise's current state?

1 Answers1