Questions tagged [promise]
"Promises" are a particular tactic for deferred computing, suitable for several styles of concurrency: thread and event loop concurrency for local computation, and both synchronous and asynchronous remote messaging.
261
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Bluebird: promisify xhr request
I use bluebird promises. I want to promisify my requests from communication layer:
Utils.js
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1
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Async db repository
This is a simple repository where I want to save all the invoices of some queried users. I wanted this module to only expose a simple saveInvoices method and return ...
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Access resolve function outside of a JavaScript Promise
I have an object that needs to have a single point of initialization, and other callers need to wait until the initialization is complete before continuing.
I have done this with jQuery, and it feels ...
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Promises with NodeJS and BlueBird
I'm using bluebird for promises in my Node/Express application and wrote an API call in which the user passes in a JSON Web Token that contains their user ...
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3
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Save handler without a nested "deferred antipattern"
I have an application in which a user makes a change, and when they click Save they will be prompted to confirm, and the appropriate REST call will be made if they agree. The intial call to ...
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Flux & async communication with websockets
I want to arrange async server-client communication with websockets and vanilla flux architecture. There is an excellent article about "Async Server-Side Communication with the Flux Architecture". I ...
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File existence promise
I hate to have to write a custom exists promise every time I need to know if a file exists, so I came up with this. Thoughts?
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Deleting a section of a website using Ajax
I am currently writing a decent amount of ajax to help me delete a section of a website.
It's already becoming a pretty big piece of code, I wondered if it were possible to compact a section of my ...
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Taking and saving pictures using promises
I have the following 4 functions that work, however, I am sure that utilising promises will improve my code. I just find them so confusing.
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Asynchronous iterator for AngularJS
I wrote this as a convenient way to batch together multiple, repetitive AJAX calls. I was working in angular at the time, so I use the $q service, but I'm sure it ...
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Resolving promises on resolver using ui-router
We're rewriting some parts of our application. We're trying to avoid the promise anti-pattern and do things properly, but I'm not certain that we did so.
More precisely, we are rewriting the resolver ...
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Angular Broadcast Asynchronous Events
Okay I have the following use case:
Module A broadcasts an event.
Module B listens to that event.
Maybe also ...
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Flow of Angular Promises
I recently put in a submission for a small coding challenge using Angular. The challenge was to get a token and array of values using a GET request then make another GET request passing the token and ...
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Use Promise to wait until DOM element exists
I need to create a JavaScript Promise that will not resolve until a specific HTML element is loaded on the page.
I don't have any way of knowing when this element will be loaded, other than to simply ...
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Detecting gyroscope data using promises
In a plugin that I am currently authoring, I am using a function to check whether the device provides gyroscopic data. Although intuitively this can be easily resolved by checking the value of ...
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126
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Logging out using nested promises
Is it OK to do that ?
for example, I have my log out service
...
- 183
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132
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Q.js worker pool
I'm building a program to scrape data about hockey games in order to compile statistics. One of the run modes will process all of the games in a single season (1230). Processing a single game consists ...
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Validate IP address and create a registration attempt
I'm a C++/Python developer attempting to learn JavaScript, but I'm struggling to write clean code. I've read that async.waterfall and Promises are two ways to flatten the code a bit, but my ...
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NodeJS authentication function rewrite with promises
I will post both of the modules, some of the code in them may be "irrelevant" for the main concern here, which is Security.prototype.authenticate(). Nevertheless, comments are welcome about all of the ...
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Rewriting this function to use `promises` instead of `async: false`
Using parse.com's javascript API, I would like to get a variable number or images from img tags on a page and save those images in the currently logged in user's ...
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Input a web page with poker events, output a gcal compatible CSV file
This script takes input from poker tournament pages at pokeratlas dot com, and outputs a CSV file that I can import to Google Calendar, listing each of the tournament events, start time, location, and ...
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Java 8 CompletableFuture - fan out implementation
I was wondering what is the best way to implement a fan out type of functionality with Java 8 Completable future. I recently rewrote a function that had a bunch of old ...
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Rewriting authentication controller using promises
I am in the process of refactoring some complex code that uses callbacks to instead use promises. I am trying to figure out if my proposed approaches make sense.
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Fetching ALL data set from API iterating via response data
Does this make sense? How would you achieve the same thing, with cleaner code?
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Mongoose and Hapi/Express promise handling in controllers
I'm switching my code to promises - mostly as delivered by Mongoose. I use Hapi though I think something similar would apply to Express.
In my models/services I perform queries such as:
...
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Unit testing a click event with asynchronous content
I'm writing unit tests for a web application that has quite a lot of UI interactions. I would like some feedback regarding on how to handle click events with asynchronous code.
My goal here is to ...
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Using $q in Angular JS to pass navigator geo JSON from factory to controller
This code is used to get the users location and deliver it as a resource to the controller. The aim is to have this data shared across multiple controllers in the application. So far this does deliver ...
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Checking for JSON or YAML file with promises
I'm using bluebird promises. I'm converting fs.exists to existsAsync (here's how) and ...
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1
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374
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Using the $q service in AngularJS to handle promises
I have a service which needs to store some settings data in a DB and at the same time maintain a reference to that in the user'slocalStorage (we want two users ...
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4k
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NodeJS and Express with Promises
I'm relatively new to NodeJS and Express, and I've recently run into the pyramid of Doom while doing stuff that requires multiple steps.
I've found that promises are very promising indeed. But I ...
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Implementing JQuery style 'deferred' and 'promise' in C#
I like the pattern of the jQuery Deferred object.
I like how you can call Resolve any number of times, but the listening objects will only be notified once. I also ...
- 721
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197
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Make sequential fadeIn() promises more manageable
I've two versions of promise code. The page is a simple one - an unordered list with a few items. I am trying to make the items show up (fadeIn) one-after-another ...
- 175
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133
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Reading the contents at three URLs using Promises
I'm learning promises and now I'm trying to figure out if something in this code can be improved. This code is expected 3 urls and then async parallel calls should be done. When all requests are ...
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Using a Wrapper Promise
I wrote some code for an application that uses the following pattern:
...
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Node.js API route for POSTing a resource. Getting rid of callback pyramid
I'm writing an API for simple GET and POST routes. The app is a shared to-do-list. Users and lists are stored separately. A list can belong to many users, and a user can have many lists.
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Node module using promises and the revealing module pattern
Can someone give me some feedback on this pattern?
I am writing a node.js module that connects to a remote API, caches JSON, returns it as output. I have a cli wrapper script that uses the module, ...
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1
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226
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Pyramidal promises
I have a situation in my Node (express) controller where I need to check whether a particular language has a parent language, if it does, I need to do a new DB (SQL) call to retrieve the parent ...
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Simple Async Google Maps initializer with AngularJS
Here is a simple reusable AngularJS factory I came up with to initialize Google Maps Asynchronously, which somehow does not seem ...
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Simple AngularJS controller for REST API
We record software builds from our build machine into a database and for practice purposes I'm building a little web dashboard for it.
The API is REST (WebApi) and provides access to query for ...
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Promise.jsm demo of Promise.all and Promise.defer
I created this demo example for MDN documentation to show how to use Promise.all and Promise.defer in user created promise. I ...
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413
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Two dialog boxes using Deferreds?
I've two similar functions and I want to use one generic function with two params, dialog and buttons. How do I do it?
My ...
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Is this a reasonable way to implement promises in node.js?
I'm using passport to setup login in an express site. The site is just a playground for me to learn. The code inside login was exhibiting the arrow anti pattern so I decided it was time to learn to ...
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Pledge: Promise-like entities design goals experiment
Background
I was writing a promises/a+ implementation, just for fun. About halfway through I decided it wasn't that fun after all, so I decided to do something a little different.
Thinking of ...
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Caching/memoizing promise results
I'm wondering what the best approach might be.
One approach is to chain cachedPromise and "regular", thus, if cachedPromise ...
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2
votes
1
answer
365
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Testing Promises vs Lock performance
I'm not sure if my lock usage is correct and safe. I wanted to know what will be best approach to deal with situation when one thread have to wait for being initialized by another so I written this ...
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2
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NodeJS broker between MongoDB and RabbitMQ
I wrote a small program that aims to take some data from the MongoDB database and put them in the RabbitMQ queue.
I tried to use only promise style but I am a beginner in JavaScript. Could you please ...
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2
answers
864
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Cleaning up nested promises in Cloud function
I am writing the Cloud function for Parse whose purpose is to update my database with a provided array of data objects. The main problem are the nested promises, which doesn't look right. Any help ...
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465
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Promise-driven animation
Inspired by this question on Stack Overflow, I've attempted to code such animation, mostly to get some more practice with async, promises and Q.js:
(Live demo)
...
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2
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Promises and chained calls
I've realized JS callback hell and I started looking into Promises libraries.
After reading some articles I decided to start with BluebirdJS. I didn't realise how to properly use them yet, because ...
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AngularFire Tic Tac Toe Game
I am building a Tic Tac Toe game with AngularJS and making it online playable with AngularFire. The Tic Tac Toe logic is all there so this question concerns Angularfire a little bit more. I want to ...
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