Sidney de Koning funky-monkey

The introduction to Reactive Programming you've been missing

This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

How to setup Let's Encrypt for Nginx on Ubuntu 16.04 (including IPv6, HTTP/2 and A+ SLL rating)

There are two main modes to run the Let's Encrypt client (called Certbot):

Standalone: replaces the webserver to respond to ACME challenges
Webroot: needs your webserver to serve challenges from a known folder.

Webroot is better because it doesn't need to replace Nginx (to bind to port 80).

In the following, we're setting up mydomain.com. HTML is served from /var/www/mydomain, and challenges are served from /var/www/letsencrypt.

Installing Postgres via Brew

Pre-Reqs

Brew Package Manager

In your command-line run the following commands:

brew doctor
brew update

A composable pattern for pure state machines with effects

State machines are everywhere in interactive systems, but they're rarely defined clearly and explicitly. Given some big blob of code including implicit state machines, which transitions are possible and under what conditions? What effects take place on what transitions?

There are existing design patterns for state machines, but all the patterns I've seen complect side effects with the structure of the state machine itself. Instances of these patterns are difficult to test without mocking, and they end up with more dependencies. Worse, the classic patterns compose poorly: hierarchical state machines are typically not straightforward extensions. The functional programming world has solutions, but they don't transpose neatly enough to be broadly usable in mainstream languages.

Here I present a composable pattern for pure state machiness with effects,

Download Udemy course videos using youtube-dl

$ youtube-dl --list-extractors | grep udemy

Steps

Get link to the course to download. e.g. https://www.udemy.com/course-name/
Login into udemy website, save the cookie from Firefox (cookies.txt)[1] export extension. Save it to file cookies.txt

$ youtube-dl https://www.udemy.com/course-name/ --cookies ./cookies.txt > $ youtube-dl -u username -p password -o './videos/%(playlist)s/%(chapter_number)s - %(chapter)s/%(title)s.%(ext)s' https://www.udemy.com/course-name --cookies ./cookies.txt --verbose

Safest way to clean up boot partition - Ubuntu 14.04LTS-x64

Reference

Case I: if /boot is not 100% full and apt is working

1. Check the current kernel version

$ uname -r

Connect printer, install printer drivers, and enable Printer Sharing.
Open terminal, run: dns-sd -Z _ipp._tcp. You'll see a few lines of repeated text. Look for your printer's name, next to that record you will see a TXT, copy everything after TXT into a notepad.
In that TXT line, you'll see a line like this: "pdl=application/octet-stream,application/pdf,application/postscript,image/jpeg,image/png,image/pwg-raster" Change that, to add ,image/urf. So it'll look like: "pdl=application/octet-stream,application/pdf,application/postscript,image/jpeg,image/png,image/pwg-raster,image/urf"
Now take that entire TXT line, and add it to this: dns-sd -R "name_to_be advertised" _ipp._tcp.,_universal . 631 URF=none pdl=application/pdf,image/urf YOUR_TXT_STRING
Run that line in the terminal, and Airprint should be enabled.

	---
	layout: null
	---
	<?xml version="1.0" encoding="UTF-8"?>
	<rss xmlns:atom="http://www.w3.org/2005/Atom" xmlns:content="http://purl.org/rss/1.0/modules/content/" xmlns:itunes="http://www.itunes.com/dtds/podcast-1.0.dtd" xmlns:googleplay="http://www.google.com/schemas/play-podcasts/1.0" xmlns:media="http://www.rssboard.org/media-rss" version="2.0">
	<channel>
	<title>Darknet Diaries</title>
	<link>https://darknetdiaries.com/</link>
	<language>en-us</language>
	<atom:link href="{{ site.url }}/feed.xml" rel="self" type="application/rss+xml" />

	# to generate your dhparam.pem file, run in the terminal
	openssl dhparam -out /etc/nginx/ssl/dhparam.pem 2048

	# copy-and-paste the output of this script into a shell, and rejoice.
	files=Dir.glob('*.mp3').sort.join('\|')
	puts "ffmpeg -i \"concat:#{files}\" -acodec copy output.mp3"