The online whiteboard of Kristofer Palmvik
This application is designed to help beginners grasp the powerful concepts behind branching when working with git. We hope you enjoy this application and maybe even learn something!
Our deploys are ridiculous now. Combined with our custom Capistrano recipes, they’re very fast. Here’s what we do. First we send the existing Unicorn master a USR2 signal. This tells it to begin starting a new master process, reloading all our app code. When the new master is fully loaded it forks all the workers it needs. The first worker forked notices there is still an old master and sends it a QUIT signal. When the old master receives the QUIT, it starts gracefully shutting down its workers. Once all the workers have finished serving requests, it dies. We now have a fresh version of our app, fully loaded and ready to receive requests, without any downtime: the old and new workers all share the Unix Domain Socket so nginx doesn’t have to even care about the transition.
A mostly reasonable approach to JavaScript
Stand-alone parallax scrolling library for mobile (Android iOS) and desktop. No jQuery. Just plain JavaScript (and some love).
DOIs form the backbone of the academic reference and metrics system. With a DOI for your GitHub repository, your code becomes citable.
The hardest part of the learning journey is thinking in FRP. It’s a lot about letting go of old imperative and stateful habits of typical programming, and forcing your brain to work in a different paradigm. I haven’t found any guide on the internet in this aspect, and I think the world deserves a practical tutorial on how to think in FRP, so that you can get started. Library documentation can light your way after that. I hope this helps you.
You may want these for a presentation, a blog post or for the site featuring your brand new awesome lightbox script (please no!). All logos are high resolution with transparent backgrounds.
Microsoft’s own Services Design guidelines provides a good initial summary on why OData-like services are a Services anti-pattern:
JavaScript" is as related to "Java" as "Carnival" is to "Car
This project is an example of how the popular FizzBuzz game might be built were it subject to the high quality standards of enterprise software.
This probably returns as empty which mean: rm -rf "$STEAMROOT/"* is the same ass rm -rf "/"*.
The most important Flux data flow diagram is this: Action -> Dispatcher -> Store -> View. The rest, while suggesting best practices, are really just implementation details. How data leaves the system and goes to the server does not matter very much. What matters more is how it enters the system and flows through it. Always start the flow with dispatched actions.
A little tool to lint websites for IE8 compatibility, with warnings for possible pitfalls and suggested fixes.
React Canvas adds the ability for React components to render to rather than DOM. This project is a work-in-progress. Though much of the code is in production on flipboard.com, the React canvas bindings are relatively new and the API is subject to change.
Note that as of this release, jsdom no longer works with Node.js™, and instead requires io.js. You are still welcome to install a release in the 3.x series if you are stuck on legacy technology like Node.js™.
React is an amazing abstraction, but very few abstractions come without at least some overhead. In the case of Atom’s text editor, it’s worth the effort to avoid this overhead by hand coding all DOM updates.
npm@3’s dependency resolution algorithm makes the node_modules folder as flat as possible (that is, if there are no conflicts, it puts all requirements at the top level. This results in a implicitly deduped and very shallow tree. Outside of pathological cases, I anticipate that this will solve the "256 char limit" problem by never producing folders nested deeply enough to hit it.
This repository is an attempt to answer the age old interview question "What happens when you type google.com into your browser’s address box and press enter?" Except instead of the usual story, we’re going to try to answer this question in as much detail as possible. No skipping out on anything.
This primer makes use of several libraries, but it is by no means a "React the right way". It’s just a introduction to how I am building my own React applications. The goal of this primer to help developers get familiar with React and dive right in.
Hashbangs (#!), hashes (#) and even the HTML5 History API (pushState, popState) all have issues. This article will go through the issues with each one, their use cases, then provide the evolution of their solutions.
If you’re reading a prop named key you might be overloading the meaning of key or accidentally using it for something unrelated. This change makes the concept a bit more strict. This helps avoids bugs with transferring props to another component which shouldn’t bring the key and ref along with it. It also helps performance by ensure that types in React internals are consistent and stable.
Side-by-side comparison of maps showing available bike lanes and car lanes in the ten largest Swedish cities.
I just ended up installing a couple of libraries that made sense to have globally and were unrelated to my projects (ie: codeception/etc). Some of the required dependencies are now conflicting with my projects. My only option is to install codeception in all my projects.. quite tedious.
DIMOC, which means that component will "Do It Myself Or Callback". Nothing too clever, but the operative word here is "OR": the child component is offering a contract to EITHER manage its own state (which we might also assume includes some sort of persistence) OR take a callback to tell its parent about everything it wants to have done to itself.
In this post, I’m going to take a look at some common scenarios where you might want to "undo" a change you’ve made and the best way to do it using Git.
I’d like to propose that instead of using the term "isomorphic" to denote code that runs in servers, browsers, and mobile devices we use the word "universal".
The 0.13.0 improvements to React Components are often framed as "es6 classes" but being able to use the new class syntax isn’t really the big change. The main thing of note in 0.13 is that React Components are no longer special objects that need to be created using a specific method (createClass()). One of the benefits of this change is that you can use the es6 class syntax, but also tons of other patterns work as well!
A stamp is a composable factory function. Stamps allow you to inherit easily from multiple ancestors by composing multiple source stamps. You can combine properties, methods, and initializers (with closures) from any number of stamps to produce a new stamp. Stamps are more flexible than traditional factory functions or classical multiple inheritance. Traditional factory functions can’t be composed together to produce new factory functions. Class inheritance does not provide a standardized mechanism for class composition.
This guide serves as a mini-tour of tools, trix and patterns that can be used to run async code in Meteor.
When a user submits a comment, echochamber.js will save the comment to the user’s LocalStorage, so when they return to the page, they can be confident that their voice is being heard, and feel engaged with your very engaging content. It does not make any HTTP requests. Since LocalStorage is only local, you and your database need not be burdened with other people’s opinions.
React Router is a fantastic routing library, but one downside is that it abstracts away a very crucial piece of application state — the current route!
UpUp is a tiny javascript library that makes sure your users can always access your site’s content, even when they’re on a plane, in an elevator, or 20,000 leagues under the sea.
git-fire is a Git plugin that helps in the event of an emergency by adding all current files, committing, and pushing to a new branch (to prevent merge conflicts).
Detects when your tests are being run in a CI server, and makes them pass.
React style guide from Khan Academy
react-map-gl provides a React friendly API wrapper around Mapbox GL JS. A webGL based vector tile mapping library.
Legofy your images with retina support using SVG.
There are currently no other active core members in Bower. ... Personally I find it hilarious how much Bower is used and how little support it gets. Community comments about "killing it as soon as possible" don’t help as well.
An attempt to be a little cleverer with how service-worker intercepts requests in order to emulate server push.
Consider starting the commit message with an applicable emoji
My notes for Dokku on Digital Ocean.
webkitTextSizeAdjust was deprecated on desktops versions of the browser. This was the only bullet proof way to detect zoom in desktop chrome that I am aware of.
GitHub.com no longer delivers its icons via icon font. Instead, we’ve replaced all the Octicons throughout our codebase with SVG alternatives
Style guide generator for React components. It lists component propTypes and shows live, editable usage examples based on Markdown files. You can use it to generate a static HTML page to share and publish or as a workbench for developing new components using hot reloaded dev server.
Use this value to indicate you want to use the value of color for other properties that accept a color value: borders, box shadows, outlines, or backgrounds.
Why copy-paste when you can require it and with the benefit of having a clear intent. Fixing a bug in a snippet means updating one module instead of manually fixing all the instances where the snippet is used.
Build OS X desktop apps using React Native
Netdata is a daemon that collects data in realtime (per second) and presents a web site to view and analyze them. The presentation is also real-time and full of interactive charts that precisely render all collected values.
This is a new option which lets you force commit squashing on all pull requests merged via the merge button.
A collection of tips to help take your CSS skills pro.
Many people in the JS community feel that adding class syntax to the language was a mistake. I share this sentiment, but I have encountered quite a few programmers in the wild who don’t agree or simply don’t seem to understand why some of us have this opinion. So, I wanted to create an online reference where people could come to learn specifically about this issue and why they might not actually need class syntax in JavaScript.
A list of everything that goes in the <head> of your HTML document
CSS Guidelines I use for personal projects including Scally CSS framework and at work
If you’re a Homebrew user and you installed node via Homebrew, there is a major philosophical issue with the way Homebrew and NPM work together.
Hypernova lets you write all of your view code in a single place without having to sacrifice the user‘s experience.
Create a new node module with all the right stuff.
Solving the second hard problem in Computer Science
Noms is a decentralized database based on ideas from Git.
Manet is a REST API server which allows capturing screenshots of websites using various parameters. It is a good way to make sure that your websites are responsive or to make thumbnails.
Docker Cheat Sheet
Our model solution used a fairly common trick to bypass CSP: The Google-CDN, white-listed by the CSP rules on this page, offers outdated versions of AngularJS.
This will be one important thing we’ll do after the webpack 2 release. We concentrate on documentation and bug fixing now.
Catalog of React components / libraries
A Webpack loader for working with Javascript in Swedish
This guide is by and for engineers who use AWS. It aims to be a useful, living reference that consolidates links, tips, gotchas, and best practices. It arose from discussion and editing over beers by several engineers who have used AWS extensively.
The open-source Trello-like kanban (built with Meteor)
Strings which have a high probability of causing issues when used as user-input data.
Transform plain text into dynamic blogs and websites using the latest web technologies. A React.js static site generator.
It will monitor when a web font is applied to the page and notify you. It does not limit you in any way in where, when, or how you load your web fonts.
The guidelines Microsoft REST APIs SHOULD follow so RESTful interfaces are developed consistently
Gixy is a tool to analyze Nginx configuration. The main goal of Gixy is to prevent security misconfiguration and automate flaw detection.
Contributing to the software you already use isn’t altruistic—it’s an investment in the tools your company relies on. And you can always start small: spend two hours every Friday working on an open source project relevant to your business
Enable developers to set and enforce limits on network usage by nested contexts (i.e. iframes).
Exceptions are rescued and automatically reported to your favorite reporting service. In development and test environments, exceptions are raised so you can fix them.
Sanitizes HTML and prevents XSS attacks. You can feed DOMPurify with string full of dirty HTML and it will return a string with clean HTML.
A curated list of awesome projects which use Machine Learning to generate synthetic content.
A brand new protocol using HTTP/2 Server Push to create fast and idiomatic client-driven REST APIs.
A short doc comparing the popular CSS-in-JS libraries styled-components and emotion
Keep your wireframes free of distracting Lorem Ipsum.
In a zero trust architecture, inherent trust is removed from the network. Just because you’re connected to a network doesn’t mean you should be able to access everything on that network.
A good cors proxy should: allow requested method & headers in preflight request...
The Frontend Application Bundle is designed to fill a gap between existing options for frontend application deployment and hosting environments. Usually, you have a choice between a static site host, which prevents you from having any active server-side components, or a more traditional web app host designed for hosting backends.
This visualization display bechdel data of the 100 highest rated movies on IMDb. The movies are classified and visualized according to their primary genre. The aim of the visualization is to investigate if there is a connection between movie genre and the amount of movies passing the Bechdel test.
Any top-level comment on pull request ought be tagged with one of four emojis:
List of neighboring municipalities (grannkommuner) in Sweden
Blitz is a Rails-like framework for monolithic, full-stack React apps — built on Next.js
Redwood is an opinionated, full-stack, serverless web application framework that will allow you to build and deploy JAMstack applications with ease.
Mingla is an Slack bot used at SVT for (semi-)spontaneous video chats. We are a group of people that misses the spontaneous chats at the coffee machine, hallways, after meetings... we got inspired by bump-into-colleagues and articles like this article about weak tie friendships.
Vitedge is just a Vite app ™ that prerrenders the first view in an edge worker and runs the rest as an SPA. That means it will lead to good SEO while keeping the snappy routing and DX of an SPA.
esbuild-loader lets you harness the speed of esbuild in your Webpack build by offering faster alternatives for transpilation (eg. babel-loader/ts-loader) and minification (eg. Terser)!
The General Bikeshare Feed Specification, known as GBFS, is the open data standard for shared mobility. GBFS makes real-time data feeds in a uniform format publicly available online, with an emphasis on findability. GBFS is intended to make information publicly available online; therefore information that is personally identifiable is not currently and will not become part of the core specification.
Generate ten different malicious pdf files with phone-home functionality.
Miniflare is a simulator for developing and testing Cloudflare Workers. It’s an alternative to wrangler dev, written in TypeScript, that runs your workers in a sandbox implementing Workers’ runtime APIs.
Your is the single biggest render-blocking part of your page—ensuring it is well-formed is critical. ct.css is a diagnostic CSS snippet that exposes potential performance issues in your page’s tags.
Qwik is designed for the fastest possible page load time, by deliving pure HTML with near 0 javascript for your pages to become interactive, regardless of how complex your site or app is. It achieves this via resumability of HTML and ultra fine-grained lazy-loading of code.
Super lightweight First-class TypeScript support Custom Middleware Support Well-organized submodules for à la carte functionality Includes Router with support for pattern definitions Familiar Request-Response handler API Supports async/await handlers Fully treeshakable
Partytown is a lazy-loaded library to help relocate resource intensive scripts into a web worker, and off of the main thread. Its goal is to help speed up sites by dedicating the main thread to your code, and offloading third-party scripts to a web worker.
Sunder allows you to quickly build websites and APIs in a modern async structure on Cloudflare Workers. Think of Sunder as Express or Koa for serverless.
Hono - [炎] means flame🔥 in Japanese - is a small, simple, and ultrafast web framework for Cloudflare Workers and Service Worker based serverless such as Fastly Compute@Edge.
A falsehood is an idea that you initially believed was true, but in reality, it is proven to be false.
Given a Linkedin post URL we can extract the UTC timestamp which isn’t otherwise available in frontend metadata.
Self-hosting is the practice of hosting and managing applications on your own server(s) instead of consuming from SaaSS providers. This is a list of Free Software network services and web applications which can be hosted on your own server(s).
A compilation of well-written, step-by-step guides for re-creating our favorite technologies from scratch. It’s a great way to learn.
A script to highlight elements that are mismatched incorrectly to @font-face blocks, which may result in shoddy faux bold or faux italic rendering.
Support for CDS/CDNSKEY/CSYNC updates
Naming things is hard. This sheet attempts to make it easier. Although these suggestions can be applied to any programming language, I will use JavaScript to illustrate them in practice.
wretch is a small wrapper around fetch designed to simplify the way to perform network requests and handle responses.
A curated list of software and architecture related design patterns.
The Speaker Buddy system offers speakers some peace of mind when presenting at conferences.
Yup is a schema builder for runtime value parsing and validation. Define a schema, transform a value to match, assert the shape of an existing value, or both. Yup schema are extremely expressive and allow modeling complex, interdependent validations, or value transformation.
Microsoft’s internal company-wide REST API design guidelines. Teams at Microsoft typically reference this document when setting API design policy. They may additionally create documents specific to their team, adding further guidance or making adjustments as appropriate to their circumstances.
Wildebeest is an ActivityPub and Mastodon-compatible server. Wildebeest runs on top Cloudflare’s Supercloud, uses Workers, Pages, Durable Objects, Queues, the D1 database to store metadata and configurations, Zero Trust Access to handle authentication and Images for media handling.
A GitHub Action that runs npx update-browserslist-db@latest on a repository and proposes a pull request to merge updates.
SonarJS rules for ESLint to detect bugs and suspicious patterns in your code.
An unresponsive service can be worse than a down one. It can tie up your entire system if not handled properly. All network requests should have a timeout.
Explain complex systems using visuals and simple terms. Whether you're preparing for a System Design Interview or you simply want to understand how systems work beneath the surface, we hope this repository will help you achieve that.
By offering sanitization, detection of harmful language, prevention of data leakage, and resistance against prompt injection attacks, LLM-Guard ensures that your interactions with LLMs remain safe and secure.
A curated and opinionated list of resources for Chief Technology Officers, with the emphasis on startups
Property price scraper and predictor from Hemnet
This is the home to my learnings and experiences working with serverless and event-driven workloads on AWS. I started working with serverless technologies back in 2015.
Adding a primary key to a table does not guarantee that existing rows get the same primary key values in the primary and secondary MySQL replica database.
A set of high-level guiding principles for approaching web accessibility
One solution to deploy serverless workloads everywhere - Serverless Container Framework (SCF) is a unified development and deployment experience for containers on serverless platforms.
Two conversational AI agents switching from English to sound-level protocol after confirming they are both AI agents
The Elimination Game is a multi-player tournament that tests LLMs in social reasoning, strategy, and deception. Players engage in public and private conversations, form alliances, and vote to eliminate each other round by round until only two remain. A jury of eliminated players then casts deciding votes to crown the winner.
What are the principles we can use to build LLM-powered software that is actually good enough to put in the hands of production customers?
Memorising docker commands is hard. Memorising aliases is slightly less hard. Keeping track of your containers across multiple terminal windows is near impossible. What if you had all the information you needed in one terminal window with every common command living one keypress away (and the ability to add custom commands as well). Lazydocker's goal is to make that dream a reality.
A configuration framework that enhances Claude Code with specialized commands, cognitive personas, and development methodologies.
TEST-DRIVEN DEVELOPMENT IS NON-NEGOTIABLE. Every single line of production code must be written in response to a failing test. No exceptions. This is not a suggestion or a preference - it is the fundamental practice that enables all other principles in this document.