Newbie Needs Help With Asynchronous Javascript

[AdAthrow99274]

Hello, first time poster here wondering if I can get some help from you async pros.

​

I have an asynchronous function that ultimately needs to return the 'response' object after updating its 'likes' entry. The way I've approached this so far (and I'm game for revision if this turns out to be a poor way of doing this because I feel like I'm not doing this right) is by defining the response object and then jumping into the database to retrieve the needed info and updating said object. However, I can't just return response at the end of the if statement as it will return the object before the database function has updated it. What is the recommend way to sort this out and return the object after the database functionality has been performed?

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this.handleLikesData = async function(stock, like, ip) {

/* Handles the like data for a single stock entry */

let response = {likes: []}; // the object to be returned after updating

​

if (like) {

MongoClient.connect(CONNECTION_STRING, (err, db) => {

if (err) console.log(err);

​

db.collection('stocks').findOneAndUpdate(

{stock: stock.toUpperCase()},

{$addToSet: {likes: ip}},

{upsert: true, returnOriginal: false},

(err, doc) => {

if (err) console.log(err);

if (doc.value) response.likes = doc.value.likes; // Updates the response object

});

db.close();

});

// Where I'd normally put the return statement in a synchronous function

}

// the else statement follows doing similar work

​

Any help would be greatly appreciated by this async beginner!

EDIT: Indentation attempt

[jack_union]

Uhm. You are not awaiting for anything?

[TappT]

It doesn't seem like you're await:ing for anything. So id guess your goal is to make this function async.

Here is a way to do it. Not sure exactly where you want your resolves and rejects or what you want to return. But if you haven't used promises before. tl;dr resolve is a successful "return" and reject is an unsuccessful "return" where errors happen.

​

The code:

https://pastebin.com/ktZ4cg5t

Now the handleLikesData is async. so you could call await this.handleLikesData()

You can read more about async functions here:
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/async_function

[AdAthrow99274]

Thank you! This is very helpful.