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How do I return the value from a callback in this promise?


How do I return the value from a callback in this promise?

By : Ahsan Sohail
Date : November 18 2020, 03:01 PM
Does that help In my angularJS 4 app, I'm using a cordova accelerometer plugin called device motion for something. The api has a function call getAcceleration(successCallback,errorCallback). So i created a service that looks like this , Instead of:
code :
resolve(this.acc.getCurrentAcceleration(this.onSuccess,this.onError));
this.acc.getCurrentAcceleration(resolve, reject);


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May I return a promise from a .then() callback?

May I return a promise from a .then() callback?


By : user3205657
Date : March 29 2020, 07:55 AM
like below fixes the issue Yes, absolutely you can return a promise in .then - this is how you execute consecutive async actions.
If you return a promise in .then, then when this promise is fulfilled the result will be given to the next chained .then.
return callback() and callback() inside a promise

return callback() and callback() inside a promise


By : cav1
Date : March 29 2020, 07:55 AM
To fix this issue These return just break user.Find and user.validPassword callbacks execution. As an example, it can be replace by else conditions as follow:
code :
const localLogin = new LocalStrategy(localOptions, (email, password, done) => {
    User.find({ where: { email } }).then(user => {
        if (!user) {
            done(null, false);
        }
        else {
            user.validPassword(password, (err, isMatch) => { // return at this point is not needed, because there is nothing to break after this function
                if (err) {
                    done(err, false);
                }
                else{
                    if (!isMatch) {
                        done(null, false);
                    }
                    else {
                        done(null, user);
                    }

                }
            });
        }
    }).catch(err => {
        done(err, false);
    });
});
How do I make an callback to return promise? Can I use Promise.resolve() as my callback function?

How do I make an callback to return promise? Can I use Promise.resolve() as my callback function?


By : idy
Date : March 29 2020, 07:55 AM
wish helps you There is a simple util for that, namely util.promisify https://nodejs.org/api/util.html#util_util_promisify_original
code :
let util = require('util')

// create a copy and call it yourself ...
util.promisify(BlogPost.destroy).call(BlogPost, 'foo@example.com', 'Hello World!')
.then(()=>{  
  console.log('post deleted')
});



// ... or create a alternative method:
BlogPost.prototype.destroyPromises = util.promisify(BlogPost.destroy)

// later
BlogPost.destroyPromises('foo@example.com', 'Hello World!')
.then(()=>{  
  console.log('post deleted')
});
Make javascript function with callback/promise implementation to always return a promise

Make javascript function with callback/promise implementation to always return a promise


By : Ability
Date : March 29 2020, 07:55 AM
I hope this helps . No, Bluebird has no such utility. Supporting both callbacks and promises is nice if you provide them as an API, but not when you need to consume an API - distinguishing whether the method takes callbacks or returns promises or both is not possible from outside, and writing code that figures it out dynamically (on every call) might be possible but awkward.
Bluebird does have a utility that wraps function which might return, throw or return a promise, it's called Promise.method (and there's also Promise.try which immediately invokes it).
How to return return from a promise callback with fetch?

How to return return from a promise callback with fetch?


By : sumeyraa
Date : March 29 2020, 07:55 AM
it fixes the issue If you need the response as JSON - and considering response.json() effectively the same as response.text().then(txt => JSON.parse(txt))
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