CODEWITHSUNDEEP
javascriptnode.jsreactjs
Chipe
Chipe

Reputation: 4811

Resolving promise in nodejs server after data comes from another call?

I have a few promises in my node server that after they all resolve the server renders to the client. I am using Promise.all([ ... that has all the data from the few promises I have.

I now however need some data from another call before one of my promises resolves. But it seems Promise.all is still resolving before I have what I need.

const myPromise = new Promise((resolve) => {
    needDataFromThisCall(someInfo)
    .then((data) => {
        return resolve(sortData(data))
    })
    .catch((error) => {
        //error handle
    })
})
.then((resolvedData) => {
    return resolvedData;
})

This does not seem to work because the final .then the resolvedData is undefined and seems to get resolved before I get into my sortData function. Does the return resolve(sortData... not end up giving its return value to the final .then?

How should this really be done so myPromise can resolve after I have that data needed to send to sortData?

Upvotes: 0

Views: 64

Answers (1)

Tareq
Tareq

Reputation: 5363

Below code works fine. Assuming sortData is synchronous function, you need to resolve myPromise to get the result.

let someInfo = [2,3,1];

let needDataFromThisCall = info => new Promise(res => setTimeout(()=>res(info), 500) );

let sortData = data => data.sort();

const myPromise = new Promise((resolve) => {
    needDataFromThisCall(someInfo)
    .then((data) => {
        return resolve(sortData(data))
    })
    .catch((error) => {
        //error handle
    })
})
.then((resolvedData) => {
    return resolvedData;
})

myPromise.then(data => console.log('final data', data))

Upvotes: 1

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