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,

mykelswitzer

// How to get the pickadate to mount correcty in React.js component
// requires jQuery and pickadate.js (https://github.com/amsul/pickadate.js/)

var Component = React.createClass({

  getInitialState: function() {
    return ({value: null});
  },

  componentDidMount: function() {

Deraen

• (:identity req) is auth backend independent way to access user data
• login and logout implementation depends on auth backend
• :current-user doesn't imply that authentication is required, route should also have :auth-rules if authentication is required

franga2000

#Kali Linux on Acer Aspire Switch ##The problem What's the problem with this tablet? Why can't I just insert the USB and mash F12 until it boots? The tablet is made to run Windows 8.1 and Windows 8.1 only. Because of the stupidity that is UEFI (specifically it's "Safe boot" feature) we can't just boot from any USB stick we want. Also, because someone thought putting a 32-bit UEFI on a 64-bit system was a good idea.

NOTE: This guide focuses on installing Kali alongside Windows. If you're trying to replace Windows, then I assume you know enough about Linux to know which parts to change.

##Requirements Before you start, there's a few things you need:

city41

This is the example that comes with the reagent template converted to use HTML5 based history. This means there are no # in the urls.

I just got this working, so there might be better approaches

The changes are

• use goog.history.Html5history instead of goog.History
• listen to clicks on the page, extract the path from them, and push them onto the history
• listen to history changes, and have secretary do its thing in response

nickloewen

This is a plain-text version of Bret Victor’s reading list. It was requested by hf on Hacker News.

---

Highly recommended things!

This is my five-star list. These are my favorite things in all the world.

A few of these works have had an extraordinary effect on my life or way of thinking. They get a sixth star. ★

denji

Moved to git-repository: https://github.com/denji/awesome-http-benchmark

Tools

Located in alphabetical order (not prefer)

• ab – slow and single threaded, written in C
• apib – most of the features of ApacheBench (ab), also designed as a more modern replacement, written in C
• autocannon – fast HTTP/1.1 benchmarking tool written in Node.js
• baloo – Expressive end-to-end HTTP API testing made easy, written in Go (golang)

tnolet

#!/bin/bash
# Perform installation as root
# Install prereqs

yum -y install libcurl libcurl-devel rrdtool rrdtool-devel rrdtool-prel libgcrypt-devel gcc make gcc-c++

# Get Collectd, untar it, make it and install

wget http://collectd.org/files/collectd-5.4.0.tar.gz
tar zxvf collectd-5.4.0.tar.gz

ryansobol

Originally published in June 2008

When hiring Ruby on Rails programmers, knowing the right questions to ask during an interview was a real challenge for me at first. In 30 minutes or less, it's difficult to get a solid read on a candidate's skill set without looking at code they've previously written. And in the corporate/enterprise world, I often don't have access to their previous work.

To ensure we hired competent ruby developers at my last job, I created a list of 15 ruby questions -- a ruby measuring stick if you will -- to select the cream of the crop that walked through our doors.

What to expect

Candidates will typically give you a range of responses based on their experience and personality. So it's up to you to decide the correctness of their answer.

billywhizz

var TCP = process.binding("tcp_wrap").TCP;
try {
	var crypto = process.binding("crypto");
	var SecureContext = crypto.SecureContext;
} catch (e) {
	throw new Error("node.js not compiled with openssl crypto support.");
}
function noop() {};

function createCredentials(key, cert, ciphers) {