Chris Kelly cpjk

##References

ActiveRecord Associations

##Create Models

Create tables:

rails g model Location

rails g model User

rails g model Checkin

Until last night I lived in fear of tildes, carats, resets and reverts in Git. I cargo culted, I destroyed, I laid waste the tidy indicies, branches and trees Git so diligently tried to maintain. Then Zach Holman gave a talk at Paperless Post. It was about Git secrets. He didn't directly cover these topics but he gave an example that made me realize it was time to learn.

A better undo

Generally, when I push out bad code, I panic, hit git reset --hard HEAD^, push and clean up the pieces later. I don't even really know what most of that means. Notational Velocity seems to be fond of it ... in that I just keep copying it from Notational Velocity and pasting it. Turns out, this is dumb. I've irreversibly lost the faulty changes I made. I'll probably even make the same mistakes again. It's like torching your house to get rid of some mice.

Enter Holman. He suggests a better default undo. git reset --soft HEAD^. Says it stag

Around 2006-2007, it was a bit of a fashion to hook lava lamps up to the build server. Normally, the green lava lamp would be on, but if the build failed, it would turn off and the red lava lamp would turn on.

By coincidence, I've actually met, about that time, (probably) the first person to hook up a lava lamp to a build server. It was Alberto Savoia, who'd founded a testing tools company (that did some very interesting things around generative testing that have basically never been noticed). Alberto had noticed that people did not react with any urgency when the build broke. They'd check in broken code and go off to something else, only reacting to the breakage they'd caused when some other programmer pulled the change and had problems.

What I Wish I'd Known About Equity Before Joining A Unicorn

Disclaimer: This piece is written anonymously. The names of a few particular companies are mentioned, but as common examples only.

This is a short write-up on things that I wish I'd known and considered before joining a private company (aka startup, aka unicorn in some cases). I'm not trying to make the case that you should never join a private company, but the power imbalance between founder and employee is extreme, and that potential candidates would

	Latency Comparison Numbers (~2012)
	----------------------------------
	L1 cache reference 0.5 ns
	Branch mispredict 5 ns
	L2 cache reference 7 ns 14x L1 cache
	Mutex lock/unlock 25 ns
	Main memory reference 100 ns 20x L2 cache, 200x L1 cache
	Compress 1K bytes with Zippy 3,000 ns 3 us
	Send 1K bytes over 1 Gbps network 10,000 ns 10 us
	Read 4K randomly from SSD* 150,000 ns 150 us ~1GB/sec SSD

	// Matraka's source code decoded and beautified
	// by @tlack
	//
	// Matraka is a 1005 byte Javascript "demo" by p01. It includes an 'evolving animation'
	// and great dirty synth music. View here:
	//
	// http://www.p01.org/releases/MATRAKA/matraka.png.html
	//
	// I fondly recall the demo scene of my youth, puzzling over the work of Future
	// Creators and those guys. I was puzzled by this worked so I had to figure it

	# coding=UTF-8
	from __future__ import division
	import nltk
	from collections import Counter

	# This is a simple tool for adding automatic hashtags into an article title
	# Created by Shlomi Babluki
	# Sep, 2013

	# Not tail recursive and uses ++ :(
	defmodule Quicksort do
	def sort([]), do: []

	def sort([head \| rest]) do
	{before, after} = Enum.partition(rest, &(&1 < head))
	sort(before) ++ [head] ++ sort(after)
	end
	end

	defmodule MyApp do
	use Application

	def start(_type, _args) do
	import Supervisor.Spec, warn: false

	children = [
	Plug.Adapters.Cowboy.child_spec(:http, MyApp.Router, [], [
	dispatch: dispatch
	])