Asked by: Yuxin Zenger
asked in category: General Last Updated: 18th June, 2020

Can a promise be resolved multiple times?

I faced the same thing a while ago, indeed a promise can be only resolved once, another tries will do nothing (no error, no warning, no then invocation). just pass your function as a callback and invoke it as many times you wish!

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Herein, what happens if you resolve a promise twice?

Only thing to understand is that once resolved (or rejected), that is it for a defered object - it is done. If you should call then() on it's promise again, you should immediately get the (first) resolved/rejected result. Additional calls to resolve() will not (should not?) have any effect.

Secondly, how do I resolve all promises? all() method is actually a promise that takes an array of promises(an iterable) as an input. It returns a single Promise that resolves when all of the promises passed as an iterable, which have resolved or when the iterable contains no promises. In simple way, if any of the passed-in promises reject, the Promise.

Likewise, people ask, does promise all resolve in order?

One interesting thing about Promise. all is that the order of the promises is maintained. The first promise in the array will get resolved to the first element of the output array, the second promise will be a second element in the output array and so on.

Is promise all concurrent?

all() takes in a list of promises and returns a single promise. This promise resolves when all the passed promises resolves and rejects as soon as one of the promises reject. In our case, we wanted the tasks to run concurrently, but in some cases, you do need to run them sequentially, one after another.

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