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Questions tagged [javascript]

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JavaScript (not to be confused with Java) is a high-level, dynamic, multi-paradigm, weakly-typed language used for both client-side and server-side scripting. Use this tag for questions regarding common implementations of ECMAScript, JavaScript, JScript, etc. JS does not typically refer to its ECMA-cousin, ActionScript.

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I have written a parser for Transfer-Encoding: chunked requests over HTTP/1.1. Now I'm working on optimizing the code. This is the specification 7.1. Chunked Transfer Coding. The first optimization ...
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I'm working on implementing parsing a series of Uint8Arrays that contain Transfer-Encoding: chunked data sent from the client using WHATWG Fetch over a single connection. For example, writing 1 MB ...
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I'm trying to implement a heartbeat feature for offline tracking that just sends an offline message to the server once the web browser app (Laravel-based) is offline. Ideally it will ping the app's ...
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I have a tumor dataset in R that is a Seurat object. I am working on a project to develop a new visualization tool for single-cell RNA-seq data. I want to develop the visualization using JavaScript, ...
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I was implementing a hashing function for a class and I took a minute to look at the first-party collection package for Dart to see how they implemented their hashing function for collections. They ...
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I have the plan for an UI component hierarchy. Each UI component contains zero or more children UI components, and each UI component may set an optional theme. A theme is responsible for skinning a ...
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Note: I am not super knowledgeable web javascript or streaming, but I have read this and this and this I am proposing an alternate idea and just trying to verify whether I have a sound starting point ...
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I have a website with an online keyboard. Essentially people can type on this online keyboard and send messages worldwide. My problem is users can easily intercept the POST network call to the backend ...
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I got assigned with writing unit tests for a class that instantiate a Worker inside in it's constructor. The code looks simmilar to this, class SomeClass { private _worker: Worker; constructor(...
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Related: Best practice for interoperable TypeScript→JavaScript? - Frameworks, browser extensions Angular, React, Vue, Svelte &etc. exist and are popular. Some use rxjs to flow from HTTP response, ...
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All optimising Javascript runtimes use "shapes" (SpiderMonkey term) or "hidden classes" so that instead of objects being treated as the dictionaries or hashmaps they can instead be ...
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I am writing an application using a C# backend and a Vue frontend, and I am a bit sceptical about where is best to store information about the user that is currently logged in. There are a few posts ...
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In Javascript, should appending to the signature of a callback be considered a breaking change? I.e. given an operation op(target, callback) should changing it from callback(item, index, array) to ...
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I have an image that has been converted to an svg. The conversion looks fine, but it has prefered to use fill instead of stroke. This in itself is not a bad thing in terms of converting a raster image ...
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I have a React Redux web app that fetches data from an Express/Node backend and MySQL database. I have a table of records that I fetch and store in redux as an array of objects, which I display as a ...
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I am writing a browser-based tool to manipulate and visualise data (with D3.js). Currently, I store data in a JSON format, where each table is an object and columns are arrays. eg: { "data&...
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If I have a schema that includes fields that may or may not be set, what is the best way to handle these fields? Should they be optional or instead nullable? Here an example (Mongoose/NestJs) @Schema()...
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My example applies to reading and deleting files (I/O), but this is probably a common scenario (eg, keeping local and global state in sync in functional programming). I am reading in files from a ...
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I am trying to refactor some JavaScript code to use functional programming principles. I have some functions that I want to use in a series of maps. const transformedData = rawData .map(...
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I am fairly new to web development and have been trying to figure out the best way to organize my JavaScript files for the front-end. The first approach I started with was "one JavaScript file ...
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This question is not meant to be a critique of functional programming, but more hoping for resources and opinions. I am refactoring some historically messy code so that it follows functional ...
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I recently started designing my first MVP-app. I like the idea of having a "dumb" view to be able to cover as much of the code with unit tests. The app I build will be an app to create ...
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I like to export the names in my modules both as individual named exports and grouped together in a default export. Like this: // mod.js export function f() {} export const x = true export default {f,...
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In Javascript, the iteration order of an Object is enforced since ES2020 (or before, depending...). However, is it a good idea (i.e. best practice) to depend on this? I'm currently working on a ...
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I've been reading Refactoring (2nd) by Martin Fowler. In the first chapter, he shows an example of refactoring a function where he extracts other functions from it and places them inside that function ...
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I took over a development team working on life-safety critical software earlier in the year. The product has been in development for about 8 years, but the current team has only been working on the ...
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I'm trying to make sense of the docs located at: https://developer.mozilla.org/en-US/docs/Web/API/Response/redirected It says Note: Relying on redirected to filter out redirects makes it easy for a ...
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I really don't like media queries in CSS - they have limitations, and on top of that they make the code a lot more confusing. In addition, the restrictions are so strong that when using CSS ...
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class ItemList { constructor() { this.list = [];//list holds many instances of Item Class } removeItem(id) { //...search for item in this.list, remove it } } class Item { ...
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I am currently struggling with how to solve nested grouping of data. The initial structure is given and my grouped structure below as well as my approach can be adjusted. My idea was to have the array ...
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I have a Svelte web app exclusively for internal use, so there is no main landing page or registration, as accounts need to be created by the admin. Since the main page has no function as an ...
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I'm learning JavaScript and just came across "use strict". It sounds like to me it should always be in play but me being a beginner I was wondering if there are scenarios/environments when ...
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Python, Ruby, Rust, Haskell, Kotlin, C#, C++, Perl, MATLAB, SQL, and R all call their respective array predicate checking functions any and all. Is there any record of why JavaScript's designers ...
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In MDN article on WeakSets, an example is given for using weak sets to avoid infinite recursion on circular references: // Execute a callback on everything stored inside an object function ...
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A module app.js includes another module service.js. The service.js module/file contains some functions but also does some module scoped initialisations(registry variable). // service.js const ...
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I am trying to wrap my head around what the ECMAScript specification suggests about variable assignment. Introduction: Coming from Java, this is pretty straight forward. Variables get stored at a ...
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I currently am developing a TypeScript shared library. The library needs to be imported in sections to minimize the imported bundle size, so I broke it up into packages with a monorepo with Lerna. ...
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I am a react developer and writing the client on pure JS. I have sometimes missions to received data from server and send data to server. Now between the client team and backend rough discussion ...
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This post assumes, that dtos on the UI side (SPA) could be viewed as business objects in almost all cases - except that the business logic is missing. I'm fully aware that a dtos first responsibility ...
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I will have multiple cellphones playing videos in an art gallery. The video content must be synced to the lights, which are synced to the real-world clock. As in, at 1:00pm the lights go out, 1:15 ...
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Coming from languages like C++, Java or PHP I've learned that there are Value Types and Reference Types. Value Types store values directly in the variable (in a box / memory location). Whereas ...
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I've got a backend running on Node that executes queries on a PostgreSQL database. For these queries, table and column names are imported from a .env file, for example: const ID = process.env.ID_COL; ...
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When reading through the ECMAScript specification, I noticed, it actually never mentions concepts like "pass by value" or "pass by reference". When looking at the assignment ...
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I'm just starting to build a web app using React.js, Next.js, Prisma, & PostgreSQL. In this web app, users can create "projects", which are represented by 10-15 rows in the database. ...
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Outline of the current architecture of our web app outlining the issue I'm seeing Client-side app is React, talking to a server running the Play! framework via an API. On the page is a table that ...
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Really dumb question. I really like the new feature called "optional chaining" in JavaScript, and it's used in quite a few places in my front end code. However, I am concerned that whoever ...
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I've been tasked with refactoring/simplifying the architecture of a (relatively) large node.js codebase and it makes ample use of global variables. I don't have much experience with javascript so just ...
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The company I work for is maintaining and developing a web application that uses many Node.js packages. A lot of these packages are really outdated. I can intuitively understand that it is good to ...
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Note: This question is not about this particular instance of this grid with these exact words, but about any combination of words. I am programming a puzzle game where you have to arrange a grid of ...
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I am making a game of monopoly. Inside my game I have a Board class. The Board class has an array which contains 40 squares. Each square is a different class e.g. ChanceSquare, PropertySquare ...
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