In the following code, I want to check if the promisesArray returns any data.
const promisesArray = [this.loadData1(),this.loadData2()]
Promise.all(promisesArray).then(() => {
console.log('promises.all callback -> ', promisesArray[0])
}
The above console.log can produce the following:
Promise {<fulfilled>: undefined}
[[Prototype]]: Promise
[[PromiseState]]: "fulfilled"
[[PromiseResult]]: undefined
If I do not specify index 0, it repeats the same output for both function calls passed to Promises.all.
I am trying to access the undefined value in both the responses but not sure how to with with each key being a multi-dimensional array.
If anyone has any ideas on how to easily check if both functions result in undefined I would be very grateful.
Promise.all(promisesArray)
.then((res) => res.every((r) => r === undefined))
.then((isUndefined) => {
// if isUndefined is true then all promises returned undefined
});
Using async / await syntax:
const results = await Promise.all([this.loadData1(),this.loadData2()]);
if (results.every(r => r === undefined)) {
console.log('No data!');
}