jongacnik

Good Ones

Array Diff

const difference = (a1, a2) => a1.filter(x => a2.indexOf(x) == -1)

Source

andymatuschak

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,

eloypnd

wildcard DNS in localhost development

• install dnsmasq

$ brew install dnsmasq
   ...
$ cp /usr/local/opt/dnsmasq/dnsmasq.conf.example /usr/local/etc/dnsmasq.conf

• edit /usr/local/etc/dnsmasq.conf

address=/local/127.0.0.1

remy

Chapter 1 - "Just open the terminal..."

1. Why use the terminal?

• Terminal applications
• The prompt
• Using history
• Using the keyboard

Words: 2,837

bishboria

These links no longer work. Springer have pulled the free plug.

Graduate texts in mathematics

duplicates = multiple editions

A Classical Introduction to Modern Number Theory, Kenneth Ireland Michael Rosen

A Classical Introduction to Modern Number Theory, Kenneth Ireland Michael Rosen

davestevens

Let's Encrypt

Examples of getting certificates from Let's Encrypt working on Apache, NGINX and Node.js servers.

Obtain certificates

I chose to use the manual method, you have to make a file available to verify you own the domain. Follow the commands from running

git clone https://github.com/letsencrypt/letsencrypt
cd letsencrypt

klappradla

# Convert .flac to .mp3 (lossless)
for f in *.flac; do ffmpeg -i "$f" -aq 1 "${f%flac}mp3"; done

# Convert .flac to .mp3, compress to ~ 120k
for f in *.flac; do ffmpeg -i "$f" -aq 5 "${f%flac}mp3"; done

# Convert .flac to mp3, compress to ~ 128k
for f in *.flac; do ffmpeg -i "$f" -b:a 128k "${f%flac}mp3"; done

# Convert .flac to mp3, compress to variable 190k

protrolium

ffmpeg

Converting Audio into Different Formats / Sample Rates

Minimal example: transcode from MP3 to WMA:
ffmpeg -i input.mp3 output.wma

You can get the list of supported formats with:
ffmpeg -formats

You can get the list of installed codecs with:

gunjanpatel

Amazon ec2 LAMP and FTP installation and setup

Tutorial: Installing a LAMP Web Server on Amazon Linux

Go through this amazon link http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/install-LAMP.html

Associate and Elastic IP address to your EC2 instance.

jongacnik

var iselement = require('is-element')

module.exports = function(opts) {

  var testRatio
  
  if (iselement(opts.tester)) {
    testRatio = opts.tester.clientHeight / opts.tester.clientWidth
  } else {
    testRatio = window.innerHeight / window.innerWidth