ES6 class method?

Question

JavaScript

The crux of the problem is this.

Class a {
     constructor() {}
     getCollection() {
         let collection = db.collection('users').find((err,users)=>{
             return users
        })
         return collection
    }
}

How can I wait for the callback to complete and return? Otherwise, it turns out that the empty collection returns from the method before the callback completes.

Answer 1

Node 7 can do async/await. Well, or in promises at worst.

Answer 2

Thus, don’t do a return, instead do the actions that you will do with collections right away in find, as soon as it works like that, and perform your actions

Answer 3

Maybe your collection is empty because

return users

returns undefined?
Look at the specification of the find method

Answer 4

Async : www.sohamkamani.com/blog/2016/03/14/wrapping-your-...
ES6 Promises: https://developer.mozilla.org/ru/docs/Web/JavaScri...
ES7 async/await : https://jakearchibald.com/2014/es7-async-functions/