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.
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Promises with Express/Mongoose to send comment notifications
I'm building the backend for a mobile app project.
Below is my createComment controller.
The challenge for me is that I want to send notifications out to the <...
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ES6 cron module
I just created my first ES6 module in Node, and first time using promises and I was hoping to get some feedback on it. I am the only developer at my current company, so I cannot get feedback here. I ...
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Mongoose: find() and count() query
Background
I have a query in Mongoose that finds a set of objects, and then returns these said objects together with the total number of them:
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Guide for Tidying up code with promises and exports (nodejs) [closed]
I managed to get this code working. But I would like to find out how to tidy it up. Please give me some guide.
In index.js, I have this code:
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ES6 Promise with the "co" module
I was trying to use the ES6 Promise with the "co" module to write the async code without callback. Though actual async call is neat and clean, I still have to add ...
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Recursion into git diff tree using nodegit
I'm using nodegit to develop the backend for a nodejs app that uses a mix of mongodb and git for persistence. The app has to version documents and be able to present diffs between versions, thus the ...
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Promises in mongoose
I've implemented a promises in mongoose to reduce the amount of callback hell but I am not sure whether my technique is correct.
The scenario:
Before I can save my schema I want to run some ...
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Achieve error differentiation in Promises
Background
I have a REST API using MongoDB, Node.js and Express that makes a request to my NoSQL DB and depending on different results, I want to differentiate which error I send the customer.
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Create a person if no duplicate exists
I am new to promises and although I am enjoying the simplicity after dealing with callback hell I am having some issues trying to chain them together as you can see by the mess below. So basically ...
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AngularJs: Preventing multiple $q.get() per url
I've wrote a pretty useful method to prevent multiple requests per single get url. There is a well known pattern - to store promise and return it for each next ...
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Node.js module using Promises (client for KeePassHttp)
This is my first Node module, as well as the first time using Promises in Javascript. It is a client for the KeePass plugin "KeePassHTTP" to expose passwords securely, which I am planning on using to ...
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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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`std::move_as_tuple` and `std::when_all`
Working with futures and .then, I keep running into the problem of needing to "capture by move" in a lambda. In fact, not only that, but when implementing e.g. <...
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jQuery wait for all paginations
I want to download data for all of my repos from the Github API.
Github paginates their responses and includes a header Link type:"next" when there's another page ...
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Node.js Sequelize Promise
I am working on sending a reset token via email to a potential user in Node.js, Sequelize, and Express.
The code works, but I still think it could be improved by handling the promises better.
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Chaining multiple async calls and data manipulation within promises
Is there a better way to do this (clean, efficient, good practices)?
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Logging a user in and creating a session
I have a bunch of functions that return promises and need to chain them together. However, it's currently difficult to read and I would expect it to be even harder to maintain.
I have a function that ...
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Queue that permits at most X simultaneous operations
I ran into this once (permits=N) and then again today (permits =1) where I only want 1 to N operations running simultaneously. One example comes from firing into a state machine (the permit=1 example)...
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Yet Another Todo API
I've been on an adventure trying to learn NodeJs and put together a stack that I'd be happy to put into production if one day my team said to me "Let's build it in Node!". What we have here is your ...
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MUD Telnet game
I'm new in JS and my daily job is PHP, so I decided to do simple MUD Telnet game to practice my JS skills.
The idea was to use async/await to do Telnet server code that seems synchronous at first ...
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Using promise all with push array
The code's purpose is to call to some function async given some condition was true. I've using the following code which is working as expected. Is there a way to write it better, maybe by not using ...
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Wrapping a node.js module using elasticsearch
I need to use elasticsearch in my node.js project, whose API looks like the following:
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Reservation booking code samples
I am putting together a couple code samples for prospective employers and would love some feedback. I am still pretty junior so I am not sure what constitutes a good code sample and the do's and dont'...
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List all files matched by glob within JSON file
Based on a set of globs contained in a custom field within a package.json file, I'm trying to get a list of all the files that the glob matches. In my continual quest to get more familiar with ...
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Using Bluebird with fs to read a file within each of an (variable length) array of directories
I'm reading an array (of unknown length) of modules package.json files in order to extract the "style" property and store it in an array of its own:
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Cache for slow API
I work with an API which answers really slowly. I created a module which constantly asks the API and update some cached value. The code is degraded for study purposes:
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From Callbacks to Promises - MEAN Stack
I have a MEAN Stack app in which I have been using mongoose routes to update my data. Some of those routes have a lot of back and forth in terms of updating data across multiple users and collections. ...
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Plotting JSON locations using Google Road API with Javascript Promise chaining
I wrote this code for an personal application, just to help me visualize some data related to driving. I have one JSON on my machine, this JSON contains a set of locations (lat, lngs) and every ...
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Detect the last resolve in an ES6 promise chain
I searched but failed to find a canonical pattern for ES6 promise-based queue. In fact all I am making is a step-wise FIFO buffer to ensure that messages don't collide so a very simple queue ...
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XMLHTTPrequest create own service
I'm trying to create my own service, $hR. This service uses XMLHTTPrequest to get data from a URL with promise.
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Check deep object property and find duplicate value
I use the following code to find if there is duplicate value in property path:
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Promise Chaining for a Firebase v3 Auth Subsystem - Password Based Users
Firebase v3 Offers Authentication via 3rd party oAuth providers, facebook, github,google, and twitter. They also offer password pased authentication.
Authenticated users have a firebase.User object ...
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Angular Promise trying Wrapper
Sometimes I need to repeat an execution of rejected promises several times, for example, to fetch some data over internet.
There is a wrapper, which accepts Promise and tryCount:
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JSON API client to manage user accounts
I have the following class in Typescript (using the Aurelia SPA-framework).
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Fetch: how to deal with a json payload in an error response?
Trying to get https://github.com/github/fetch working with an API that almost always returns a json payload, even when the response is an error:
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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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Callback of setTimeout function when performing synchronous actions
Inside a function I'm calling playgame service. Once I've obtained the needed data (gameBeingPlayed), I need to show a 3..2..1 counter and then start a game.
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Handle API timeouts in Node Sails.js
I am working on a node.js sails.js app that handles a number of API calls and uses Bluebird for promises. The API calls have been reliable but I would like to build in handling for if they do not ...
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Promise.spread "Polyfill"
I have written this "Polyfill" for Chrome's Promise object and I have some concerns about the implementation;
Does it actually work as designed? It seems to work ...
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Using fetch() and a new Promise object to get API results
I've written an ES6 function using the new fetch() API and returning a new resolved promise with a data object or a rejected promise with an error subclass.
I'm pretty new to both ES6 and Promises, ...
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Parallel computation to be merged, depending on single call
Steps:
Get AMOUNT from a call to API endpoint /a, e.g. AMOUNT == 5 (in the code it is set ...
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1
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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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Probe for open application on a TCP port
I need to examine an application port to see if it opens and I need to put the retry count as a parameter. Since I'm new to Node I wanted to get your feedback on it
for improvements.
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Asynchronous database lookups in Node.JS using Promises
Not confident enough if this would be the correct 'node way' of writing Promises:
Essentially, there are two async database calls, the result from both of these ...
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Promises turning into pyramids
I'm using node-ftp to download some files from an FTP server; due to nodeback difficulty and nested calls I'm promisified some of the calls, hoping that this will help get me out of pyramid code hell, ...
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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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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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