By default the Promise.All([]) function returns a number based index array that contains the results of each promise.
var promises = [];
promises.push(myFuncAsync1()); //returns 1
promises.push(myFuncAsync1()); //returns 2
Promise.all(promises).then((results)=>{
//results = [0,1]
}
What is the best vanilla way to return a named index of results with Promise.all()?
I tried with a Map, but it returns results in an array this way:
[key1, value1, key2, value2]
UPDATE:
My questions seems unclear, here is why i don't like ordered based index:
- it's crappy to maintain: if you add a promise in your code you may have to rewrite the whole results function because the index may have change.
- it's awful to read:
results[42]
(can be fixed with jib's answer below)
- Not really usable in a dynamic context:
var promises = [];
if(...)
promises.push(...);
else{
[...].forEach(... => {
if(...)
promises.push(...);
else
[...].forEach(... => {
promises.push(...);
});
});
}
Promise.all(promises).then((resultsArr)=>{
/*Here i am basically fucked without clear named results
that dont rely on promises' ordering in the array */
});
See Question&Answers more detail:
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