call back hell - returning the result using async javascript

Asked Dec 11 '14 at 14:17

Active Dec 11 '14 at 14:17

Viewed 21 times

Function below print list of books when I call.

function getBooks () {
    db.find({ }, function (err, docs) {
      var async = require('async');
      async.map(docs, function(item, callback) {
          callback(null, docs); 

      }, function(err, docs) {
        console.log(docs);
      })
    });
}

getBooks(); // prints a json array: [{book1},{book2},{book3}]

How the getBooks() function could return the result instead of printing them? I mean something like below:

var books = getBooks();
console.log(books);

thanks.

asked Dec 11 '14 at 14:17

tokhi

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2

You can't return from an async function. That's what async means. – Quentin Dec 11 '14 at 14:20
@Quentin: then how can I get the result outside of the func? any other approach to use? – tokhi Dec 11 '14 at 14:26
1

Use the Promise pattern. – Christian Benseler Dec 11 '14 at 14:27
1

@tokhi – Use a callback. (Or a promise, which is just an object that you can give callbacks to before or after the event fires). – Quentin Dec 11 '14 at 14:29

call back hell - returning the result using async javascript

0 Answers0