Potherca

Creating a real UUIDv4 in JS usually requires a library. The new https://developer.mozilla.org/en-US/docs/Web/API/Crypto/randomUUID can be used in the browser.

But how hard is it to create a valid UUIDv4? As it turns out, not very!

The following is all that is needed for a version 4 UUID (including correctly setting the so called M and N bits):

const generateUUID = () => "10000000-1000-4000-8000-100000000000".replace(/[018]/g, s => (s ^ Math.random() * 256 & 15 >> s / 4).toString(16));

This can be seen in action at https://gist.pother.ca/4a2b95623519e74b63d9485a4311ac3c

Potherca

This gist contains the recipe to make a copy button.

It is activated by adding data-js="add-to-page" to an element and including the CSS and JS files.

<link rel="stylesheet" href="https://gist.pother.ca/33b4d10024f56ba0610f8e70477687cb/copy-button.css"&gt
<script async src="https://gist.pother.ca/33b4d10024f56ba0610f8e70477687cb/copy-button.js"></script&gt
<pre data-js="copy">Your Text Goes Here</pre>

Potherca

It used to be hard to Base64 encode an image. Most often, a server-side component was used.

Nowadays, with FileReader readAsDataURL it can be easily done, 100% in the browser.

    const file = … // the contents of the image goes here

    const reader = new FileReader();

    reader.onload = (event) => {

Potherca

Five laws of library science software applications.

The five laws of library science is a theory that S. R. Ranganathan proposed in 1931, detailing the principles of operating a library system.

These laws, addpted to software applications are:

• Books are Software is for use.
• Every person his or her** book Software.
• Every book Software its reader user.
• Save the time of the reader user.

Potherca

There are a many ways to run Nextcloud:

• on localhost, on a VPS, or in a Docker container
• using Apache, nginx, php -S
• from git, from zip, via snap

On a VPS, using Snap

• Follow "How To Install and Configure Nextcloud on Ubuntu 22.04"

On a VPS, using Docker

• With nc-sciencemesh enabled: pondersource/sciencemesh-nextcloud#demo-setup

Potherca

# ~/.local/share/applications/pico8.desktop
[Desktop Entry]
Name=Pico8
Comment=Fantasy console for making, sharing and playing tiny games and other computer programs.
GenericName=Fantasy Console
X-GNOME-FullName=Pico-8
Exec=/usr/local/bin/pico8
Terminal=false
Type=Application
Icon=/usr/local/lib/pico-8/lexaloffle-pico8.png

Potherca

Learning RegEx

Games

• Slash\Escape The first and only slasher themed text based RegEx learning game.

Learn

• Regex Learn Step by step, from zero to advanced.
• RegexOne Learn Regular Expressions with simple, interactive exercises.

Potherca

Daily Scrum Template

When taking part of a Daily Scrum as Scrum Master, I find it handy to take notes. This makes sure I can hand over the role, if need be. It also means I don't have to rememeber everything as I can look things up in my notes later.

Below is the structure I use as format or "template" for taking notes.

Some things of importance:

Potherca

This gist provides 3 different data representations of Emoji Popularity per Year, from 2015 to 2021.

1. As CSV
2. As JSON, with Emoji listed per number
3. As JSON, with Emoji listed per year in an array
4. As JSON, with Emoji listed per year in an weighted object (an object with a value)

The orignal data and source reference can be found at: https://docs.google.com/spreadsheets/d/1kEaoJ_RR4DiChR9iYEBZOG8tmnVUlWAVLs_LHakAjJI/

Potherca

For a project at my employers we are working with the PHP Easy RDF library.

In order to help other developers understand how to do some basic things in Easy RDF, I have created an example that shows how to read a RDF file, find a node, remove that node or a property from that node and write the result back to the file, using Flysystem.

The Turtle document used in this example is an edited version of the test fixture used in the Solid Link Metadata Tests Suite.

A static HTML has been provided, as well as some quick-and-dirty PHP with a live example (also used to generate the HTML output).

To see the HTML visit https://bl.ocks.org/Potherca/raw/7ab3c4a8d1eca011ef4b4e884b878da0/