Questions tagged [javascript]
JavaScript is primarily a language focused on web development. Being a monopoly on the front end and having Node on the back end. Use this tag for questions regarding vanilla JavaScript; optionally tagged with an ECMAScript version. If you are using a preprocessor such as TypeScript please tag with that too.
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questions with no upvoted or accepted answers
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nodejs 401 request retry mechanism
I'm working on a project in which I have a backend in nodejs and from there I need to call external APIs, those APIs require authentication token which is valid for 15 minutes. So if response status ...
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508
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Implementing a Basic Camera UI using WebGPU and JavaScript
Context
I am currently in the process of throwing myself into learning graphics programming, and my chosen platform is using JavaScript and WebGPU. After successfully making a basic glTF JSON renderer ...
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114
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Created a paperfold like effect
I am trying to recreate a neat effect that I saw posted on Stack Overflow as a GIF .
I am trying to recreate this with CSS and JavaScript and I have created a similar effect with a button press.
I ...
- 159
5
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0
answers
568
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React Context & Hooks custom Vuex like store
I've been experimenting with Hooks lately and looking more into how can I replace Redux with useContext and useReduer. For me, ...
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5
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217
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A generic DFS in JavaScript
I implemented a general function for a depth-first-search (DFS) using JavaScript with default arguments and functions that need to be provided in order for it to work.
This function is using ...
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238
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5
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176
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Assembling and traversing a graph, given a list of items and parent pointers
I've written a function which takes input such as this:
...
- 181
5
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0
answers
779
views
Hunt n' Kill algorithm
Last day I implemented the Hunt and Kill algorithm in JavaScript, using HTML5 without any libraries. I would like my code to be reviewed.
How it works
I start with a 2D array filled with walls (1-s),...
- 321
5
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answers
3k
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Finding all paths between nodes in a graph
I wanted to write a function paths that returns the possible routes between two nodes in a graph.
For example:
...
- 672
5
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answers
5k
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Todo list with calendar
The app is a todo list with a three-day calendar. Users can add and remove lists and it's all stored in local storage. My aim was to use vanilla JS but I did use jQuery for the date picker.
I'm just ...
- 51
5
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85
views
Using components instead controllers in EmberJS v2
I am beginner in EmberJS. I have made todomvc for ember v2 for learning Ember.
My implementation works without controller. I use components instead controllers.
In the documentation I see:
...
- 151
5
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0
answers
1k
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Mocking the file system within a test
I've been using this method to test file-system functions as an alternative to mock-fs due to its lack of symlink support. I'd love to hear what others think and ...
- 721
5
votes
1
answer
4k
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Largest rectangle areas after drawing boundaries
I was asked the following question while trying to get a Hackerrank certificate. I couldn't solve on time but I now completed the solution. Can you please check if my solution seems good? Suggestions ...
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4
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0
answers
74
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Google App Script to take form responses submitted by teachers on their students and produce formatted PDF student reports
I'm not a programmer but, with help, I managed to make a Google Apps Script which takes reports, submitted by teachers on their students, to the Form Responses Sheet, and then selects all responses ...
4
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0
answers
91
views
Complete html5 platform game as a snippet
I made a complete little platformer game as a code snippet.
The goal is to try to keep jumping on the enemies without touching the ground to increase score.
I used Tad's Basic Game Objects, an open ...
- 41
4
votes
0
answers
182
views
Optimizing a Wordle Solver in JavaScript
I have written a Wordle solver in JavaScript.
The solver generates a decision tree. For each word, it generates all possible feedbacks patterns for that word, it then selects for each pattern the word ...
- 440
4
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0
answers
149
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Find the longest "common sequence" in two lists
In short, the algorithm must find the longest sequence that joins together common sequences from two lists (a more formal specification is given in the code's header).
The lists are assumed to contain ...
- 41
4
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0
answers
212
views
GeekTrust: Traffic problem - functional programming
First attempt to write functional programming, been following OO paradigm all through my programming journey
Please review the code and let me know if any comments and violations of functional ...
- 355
4
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0
answers
54
views
Fetching data from endpoint, retrieving coordinates, then merging into an output
I'm in no way a skilled developer (or even a developer at that!) but I did want to take a go at writing a script that fetched one endpoint's data, extracted some data, sent if off to be geocoded, then ...
- 171
4
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answers
63
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Javascript portfolio with 11 small apps
I'm learning to code for about a year and recently I finished my Javascript project. It contains of 11 fairly simple apps involving using APIs and DOM manipulations
https://github.com/matt765/js
it's ...
- 51
4
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0
answers
53
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Todolist in vanillaJS
I have been studying front-end development for 2 .5 months, I decided to switch to practice and wrote a todo list in 8 hours
Please write your opinion about the code and how it can be improved (...
- 41
4
votes
0
answers
1k
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Jest - mocking a class function from an external node module
I am writing unit tests for a NestJS service, which imports and instantiates a class (OAuth2Client) from an external module (google-auth-library) and uses one of its functions (verifyIdToken).
I am ...
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74
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Looking for feedback on a simple finite state machine for logging in with xstate
I have a sample React app that loads a username and password, and then randomly provides a login result on submission for the sake of example.
CodeSandbox: https://codesandbox.io/s/stack-xstate-login-...
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4
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0
answers
40
views
Rearranging data from one table to another in spreadsheets using apps script
I need some help with making my code run faster. It currently works by going through all cells in a 201x151 table. If the value in a cell is not equal to zero, then it will return the row number, the ...
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4
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0
answers
53
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Generating rooted labelled subtrees of a JS object
I recently had cause to write some code which would take an object like
const obj = {
a: 1,
c: {
d: 1,
e: 1
}
};
Which we ...
- 706
4
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0
answers
56
views
How to split and refactor a large function so it would do only one thing?
I am learning about clean and maintainable code. I heard that functions should be no more than 20 lines long (preferably 5 - 10 lines). I have come across this Bob Martin quote where he said:
“The ...
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4
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0
answers
1k
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RxJS - Prevent valueChange of one form control if another form group is dirty OR an HTTP error has occurred
I've recently started working on an Angular 7 project (I'm pretty new to Angular and RxJS), and I was requested to implement this new functionality:
The Problem
I have to implement a component to ...
sp814610
4
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0
answers
164
views
HSL Guessing Game in Svelte
The objective of the game is to guess the hue, saturation, and lightness values of a given color swatch across ten rounds.
https://github.com/shreyasminocha/guess-the-hsl
https://guess-the-hsl.now.sh
...
- 336
4
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0
answers
342
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JavaScript AVL Tree
I have been working through Introduction to Algorithms 3rd Edition, and have implemented an AVL tree through prototypal inheritance. The code presented here does work as expected based on the tests ...
- 1,255
4
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0
answers
53
views
Browser and Node.js compatible code require
The Reason
The reason I designed this code was that in many cases, when I wanted to test code in the browser that would be running on a Node instance, the code that I was copying (Don't worry, copying ...
- 1,263
4
votes
0
answers
550
views
RxJs memoized singleton selectors
I am working on an angular stack that has n amount of services that hold data in stores of this type:
...
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4
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answers
331
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Running a JavaScript program from C# with sandboxing
I am using EdgeJS in my application. The application is used to run a user-provided javascript program from C#. Because we allow execution of user scripts some sandboxing is required. I am using vm2 ...
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4
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411
views
MongoDB BulkWrite - create or update a sub document within an array
I have a series of Events (roughly 10-20 events that will be dynamically created per month):
Event Model:
...
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4
votes
0
answers
886
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Node JS | From Excel to Json
Intro -> I have to convert an excel file, which comes usually in this way:
to a Json file that must looks like this:
...
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4
votes
0
answers
180
views
Vuejs - input validation
I'm in a project that's currently using vue. I'm at the moment developing validations for the inputs and in a way to make them more flexible, my idea was to create an intermediate component "...
- 161
4
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0
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175
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Node.js tool to update Cisco UCCX with CSV data
What this tool does update skills for agents on a Contact Center Cluster (Cisco UCCX). The tool reads a csv file called agents.csv from the current working directory. This file has a list of agents ...
- 103
4
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0
answers
104
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Formatting CSV as a table using BDD
This is the problem:
Write a function to create a table from CSV data.
The input to the function is a list of strings. Each string is
formatted as a CSV record. Here’s an example for a ...
- 41
4
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0
answers
468
views
Chess AI Using Minimax and Alpha-Beta Pruning
I am working on a Chess AI using chess.js, and currently, it can run 3 layers in under 10 seconds, but 4 or more takes minutes. How can I optimize my current code to be able to run 4 or 5 layers, or ...
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4
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403
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Get current user middleware from JWT using express
I'm using Sequelize and Google oAuth for authentication, I want to create a middleware that
Verifies the sent token passed in the headers matches the one the user was initially signed to.
Finds the ...
- 41
4
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0
answers
1k
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Block YouTube iframes until user consents with cookies
I'm trying to embed YouTube video's on a website in a privacy-friendly way.
The code doesn't load the iframes by default but shows a preview
thumbnail overlayed with an info message instead. The ...
- 216
4
votes
0
answers
622
views
Client-side routing using Knockout and HTML5 History API for a single-page web application
The full question is... "Please, how can this code base or project (for client-side routing using Knockout and HTML5 History API) be further enhanced as regards security, production-readiness, ES6, ...
- 141
4
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136
views
All the paths from the root to the leaves
Given a binary tree, return all root-to-leaf paths.
Example:
-- 1
/ \
2 3
\
5
Output should be: ["1->2->5", "1->3"]
My approach: I walk the branches ...
- 586
4
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0
answers
79
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JavaScript attempt at an aspect oriented logger using proxies and reflect
I've been playing around with AOP in JavaScript to create a Logger that I can attach to classes and output what is going on (mainly instantiation, calling of functions and the results from functions). ...
- 309
4
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46
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Parsing root-level elements out of HTML fragment file
I have the following code written in NodeJS, using the parse5 library. It's purpose is to parse out the root-level elements in a file containing HTML fragments (Vue ...
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4
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103
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UI testing for a web application, with variant scenarios
I'm pretty new to software testing and am currently working on a cloud-based web application.
Briefly, the application uses:
Ext JS as a framework
Bryntum's Siesta framework for testing
Currently, ...
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4
votes
0
answers
57
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Showing a Wikipedia article's changes as Git commits
I created a small-ish NodeJS script which takes as argument the name of a Wikipedia article (and optionally a Wikipedia edition, "en" is default) and creates a Git repository with each change made to ...
- 141
4
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293
views
4
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0
answers
706
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Generating Bitly links in a Google Sheet
I have this set of functions in my Google Sheet to create a Bitly bitlink whenever data in a row is changed. While this does work, it seems really slow to me. Looking at the Execution transcript, it ...
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0
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314
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Parsing BibTeX in JavaScript
I have a project for which I need to parse BibTeX strings. In v0.2.9 and before, I used Regex, and I want to change that. I set up a while loop system that reads ...
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4
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0
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237
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Extensible factory method for starting D3 charts
I'm working on refactoring some existing code to be a bit more extensible and am wanting to create a generic factory API for starting D3 charts.
Currently, my factory looks like this:
...
- 141