I am trying to run array of functions parallel and when everybody finishes I want work on that result. I am using promises. Now, I can put all functions in an array and can do Promise.all(array of functions) But I have array like
[[promise1, promise2], [promise3,promise4], [promise5,promise6]],
where each promise is promisified function. Promise reference document says parameter in Promise.all should be an iterable object and my array is iterable. But it is not working for me. I think It is executing [promise1, promise2] as a promise but not individual promise.
Can anybody please help me how I can achieve it or is there any better way ?
You need to also call Promise.all
for each array item:
const promise4all = Promise.all(
promiseArray.map(function(innerPromiseArray) {
return Promise.all(innerPromiseArray);
})
);
Or directly:
// Fix: Promise.all.bind is required because it seems like Promise.all
// implementation relies on "this"
const promise4All = Promise.all(promiseArray.map(Promise.all.bind(Promise)))
// or
// const promise4All = Promise.all(promiseArray.map(p => Promise.all(p)))
This way the outer Promise.all
gets the grouped promises in other Promise.all
:
promise4all.then(function(promiseGroupResult) {
// promiseGroupResult is the actual result of each promise group
// and you'll be able to get each result this way: promiseGroupResult.somePropertyName
});