Questions tagged [callback]
Callback is facility to save a piece of code so that it may be invoked later in the current environment (Typically in response to an event)
160
questions
0
votes
1answer
39 views
Registering a user and login
I have these following controller functions for registering a user and login, in my app, and I want to make it more clean and maintainable.
Probably by using ...
5
votes
2answers
261 views
Message Broadcaster
I've written a basic event messenger broadcasting service. This is meant to allow for broadcasting events between loosely coupled areas of code where you may not have or care about a direct reference ...
3
votes
2answers
71 views
callback function with no dynamic memory allocation
I tried to make a callback type for embedded, I know std::function and lambda but I know that there is some dynamic memory allocation that I want to avoid, I came ...
4
votes
1answer
126 views
It's Teetime; adding tee like functionality to Popen
I recently needed to run some command line applications from Python. Whilst this is fairly simple with subprocess.Popen. I wanted to be able to properly pipe the ...
2
votes
2answers
97 views
Bitmask, How to abstract those callbacks in this implementation
I've made an POC about a bitmask implementation in order to replace a huge if/else statement.
Those statements are about strings and I have almost 15 /20 string to test. Depends on values the if/else ...
5
votes
2answers
99 views
Simple replacement for Redux in ES6
The idea about this code is that it's a full replacement of Redux — in 22 lines of code.
...
12
votes
2answers
1k views
Implementation of a Thread Pool in C++
I wanted to implement a thread pool to test my knowledge of various modern C++ features. The end result could be better, but I need a review as I'm not sure about delicate things especially regarding ...
2
votes
0answers
23 views
Customizable unidirectional questionaire in javascript
I wrote the below answer for the following question on SO a couple of days ago, and I was curious if the usage of the generator function is an acceptable one.
I choose the generator function, because ...
3
votes
1answer
45 views
Callback usage with custom Stack Exchange Flair
Today I decided to continue refining my JavaScript skills and utilized the Stack Exchange API (v2.2) to write a "user flair" replica.
In case you don't know what the flair that SE provides is:
The ...
3
votes
1answer
73 views
Ajax function with a callback
I have Ajax function with a callback which fetches all the Patient data however I have some perfomance issues and trying to figure out what it might be, does anyone have idea? That's my Code
...
1
vote
0answers
54 views
React.js hook to validate a form on submission
I am fooling around with hooks in React and I'm stumbling against decisions that I need to make regarding implementation. Below is the code for the custom useForm hook which can be used to hook up ...
3
votes
1answer
88 views
std::function alternative with no dependencies
An alternative to std::function for when compile time is more important than runtime performance. Doesn't pull in any headers.
(...
0
votes
0answers
57 views
Helper to convert arbitrary function into a custom deleter
If you want to use a custom deleter in unique_ptr you either have to pass a functor or the signature of a delete function as template argument. If you have a ...
1
vote
0answers
18 views
Creating a reusable plugin (Dialog/Notifier as example)
I started working on a notification system that is pluggable into any project. I have not made any "plugin" type javascript libraries, usually just functions very specific to the project at hand. That ...
0
votes
0answers
44 views
Making Oauth request asynchronously, with retry if token has expired
I'm struggling with asynchronous code. Does anyone have suggestions of a better way to do the following?
What I'm doing: hitting an API (google's, actually), with a call that might get a 401 if the ...
4
votes
1answer
103 views
Wrap a callback method in an awaitable method
I'm using a .NET library which uses a pre-async/await type of asynchronicity. That is, it provides asynchronous (non-awaitable) method with a callback parameter.
I'm trying to write awaitable ...
0
votes
1answer
110 views
Chaining ConstrainableSet<T> [closed]
Based on feedback on my previous question, I made many small adjustments to the code, added more APIs and tried to follow through with delivering on the excellent advice I have received in regards to ...
1
vote
0answers
53 views
C# asynchronous notification vector v2
As a result of my previous post, I have implemented / refactored my code and have started making successful use of my class. However I have come across a couple of new questions:
The observer must ...
4
votes
1answer
107 views
Constraining a property setter fluently
The below code is aimed at providing you the most amount of control and flexibility with control which value gets set to a property.
I Introduce to you, the ...
6
votes
1answer
92 views
C# asynchronous notification vector
The purpose of this class is to efficiently notify another thread when data is available with minimal blocking to access/pass the data. The data reader/producer thread processes data in bulk which ...
2
votes
0answers
22 views
UI Event Flow class
Purpose:
I wanted a way to improve event clarity and event code organization. I
observed that every single event flow went through the following
steps:
Trigger -> UI Change -> (Async) ...
4
votes
2answers
97 views
Function to call a list of callables with retry
This script is designed to be run via windows task scheduler once per day.
All callables passed to this function should only return a bool. The callables are called until either the maximum number of ...
0
votes
1answer
30 views
Updating one model field based on the associated model's field
I'm wondering if there is any way we can optimize the following code.
Scenario is Library's active field should be ...
3
votes
3answers
1k views
Simple Publisher Subscriber in Java
I am new to Java and had some difficulty creating this simple Publisher Subscriber class. It finally seems to be working and I wanted to check if I have been following best practices and see if there ...
1
vote
1answer
1k views
C++ wrapper for GLFW window object
I'm creating a window class in C++ to provide a bit of abstraction for a GLFW window.
window.h
...
0
votes
1answer
121 views
pass argument to jQuery .on() event handler callback [closed]
In my web application, a user will click a button which will call a function that triggers an AJAX call. That function accepts a single argument. I would like to be able to put that function in ...
5
votes
2answers
110 views
Event emitter npm module
I was asked to complete the task described below:
Event Emitters are objects that serve as the core building block in event-driven architectures. They simplify the process of handling asynchronous
...
1
vote
0answers
83 views
Correct Callback for each item
I have added a correct question callback for different types of questions like: radio, checkbox and descriptive..
QuestionListActivity.class (it shows the list of questions to attempt)
...
3
votes
2answers
66 views
jQuery handler to update map UI based on AJAX response
I am working on a university project that consists of creating a map application with openlayers as well as the necessary User-Interface. I am using jQuery, native JavaScript, PHP and of course HTML/...
4
votes
1answer
1k views
Simple event dispatcher
Here is my very first event dispatcher. I would like to get both, style and code review, as well as some ideas to improve this implementation (new features etc.)
I tried to write code in C++17 style ...
1
vote
2answers
61 views
Class that provides callback execution at a specified rate
Here is a class I wrote to provide a user a way to have a callback function executed at some defined frequency:
Task.hpp
...
2
votes
1answer
256 views
Extracting data from vue-chartjs into an array of datasets
I have a function which returns an array of datasets for a chart written with vue-chartjs. The getter getChartData returns an array with three objects with nested ...
2
votes
0answers
46 views
Controller to execute AJAX requests for a client
I have been developing this structure or pattern (I don't really know how to call it). It's my first time doing something like this, and I'm a bit worried about the future, if it becomes unmanageable.
...
6
votes
1answer
2k views
Simple implementation of signals and slots mechanism using templates
I tried to implement a simple signal&slots mechanism for some DSP software that runs on embedded Linux. I would like if somebody can review this code and give me some guidelines. Any review and ...
7
votes
1answer
57 views
Apply arbitrary action during recursive generator function
I've got this recursive generator function. It will traverse an object looking for "leafs", any keys that don't point to sub-objects.
Then it applies one of two actions on the leaf and yields it.
Any ...
2
votes
1answer
270 views
Make HTML/Javascript Geolocation function more linear
I'm checking users locations with HTML Geolocation before unlocking the front door. Geolocation takes a few seconds in addition to the time it takes the user to approve it, so currently I have a ...
2
votes
2answers
118 views
addEventListener after fetched data
This is working code, but I want to simplify, correct, and improve the code.
...
4
votes
1answer
1k views
Callback pattern for handling socket response
I am in the process of learning go and am coming from a PHP, JS, and Nodejs background.
I created a package that is a client which connects to a socket server and processes the data received from ...
5
votes
1answer
1k views
Custom ostream for a println-like function
I am writing a plugin in C++ that uses C API that gives me a single logging function with this signature:
typedef void(*println_t)(const char* text);
I want to ...
0
votes
1answer
50 views
Poké-permalinks
On Pokemon Fusion, I found it annoying that the webpage didn't automatically update the tab URL to the permalink when the fusion is changed, so I decided to write a UserScript to do that.
After ...
2
votes
1answer
159 views
HMAC Middleware
I have been programming a middleware for my small application that verifies if an authentication header is present and verifies the HMAC present in it. I would like to know what I could optimize in ...
3
votes
1answer
2k views
Nested loop with synchronous and asynchronous behavior
The problem is as follows. I have an array of objects like so:
...
0
votes
1answer
51 views
Running arbitrary number of mongo queries in nodejs
I am faced yet again with a callback headache:
Simply I need to return to the client the results of multiple mongo queries, the number of which I don't know in advance.
In short:
fetch the first ...
3
votes
1answer
1k views
Use callback style to start a worker thread and receive result in Qt
After using JavaScript for a while, I think callbacks are pretty good for asynchronous programming, but I haven't seen anything similar in C++. What I want to achieve is to start a worker thread from ...
2
votes
2answers
323 views
Read lines from file, calling a consumer function for each line
I wrote a function for iterating over a large file with performance in mind. It takes in an InputStream and reads until it reaches the end of the file. Whenever it ...
2
votes
0answers
389 views
C++ regex_replace with arbitrary function
This is a version of C++17 regex_replace that handles arbitrary functions to do the replacement, instead of using regex_replace'...
1
vote
1answer
2k views
C++ event system
I created a simple C++ event system. In my code Event_channel is a static class that wraps singletons that manages events per event type basis. Every singleton ...
3
votes
1answer
131 views
TimeoutManager: check whether a task has been finished within a given time
I want to make a helper class, which raises an event whenever something is not finished in a certain time.
Example: my program sends out multiple network messages concurrently. After a random delay, ...
0
votes
1answer
38 views
Implementation of callback in database request
I am a complete beginner in JavaScript / Node.js / Express, but have some experience with php.
I am trying to pass data from a SQLite database to the console. In my previous attempts, ...
9
votes
4answers
758 views
ViewModels Mediator with multiple generic callbacks
I'm developing a mediator for an MVVM application. This application lets employees file tickets with IT support to ask for help.
The mediator communicates messages and triggers callbacks between ...
