Bob TheBuilder aaronlifton3

Setup new Mac with OSX Lion from scratch

These commands are good as of 2011-07-27.

Install xcode 4

App store http://itunes.apple.com/us/app/xcode/id448457090?mt=12) The download/install takes awhile so start it first. When it finishes downloading you will still need to run it to complete installation.

iTerm2 http://www.iterm2.com/

Sessions and Conversations

HTTP is a stateless protocol. Sessions allow us to chain multiple requests together into a conversation between client and server.

Sessions should be an option of last resort. If there's no where else that the data can possibly go to achieve the desired functionality, only then should it be stored in the session. Sessions can be vulnerable to security threats from third parties, malicious users, and can cause scaling problems.

That doesn't mean we can't use sessions, but we should only use them where necessary.

Adding, Accessing, and Removing Data

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.

Setting Up Clojure on OS X

I spent a lot of time trying to find a pretty optimal (for me) setup for Clojure… at the same time I was trying to dive in and learn it. This is never optimal; you shouldn't be fighting the environment while trying to learn something.

I feel like I went through a lot of pain searching Google, StackOverflow, blogs, and other sites for random tidbits of information and instructions.

This is a comprehensive "what I learned and what I ended up doing" that will hopefully be of use to others and act as a journal for myself if I ever have to do it again. I want to be very step-by-step and explain what's happening (and why) at each step.

	# download latest libevent2 and tmux sources, and extract them somewhere
	# (thx bluejedi for tip on latest tmux URL)
	#
	# at the time of writing:
	# https://github.com/downloads/libevent/libevent/libevent-2.0.21-stable.tar.gz
	# http://sourceforge.net/projects/tmux/files/latest/download?source=files
	#

	# install deps
	yum install gcc kernel-devel make ncurses-devel

	cd ~
	sudo yum update
	sudo yum install java-1.7.0-openjdk.i686 -y

	wget https://github.com/downloads/elasticsearch/elasticsearch/elasticsearch-0.19.9.tar.gz -O elasticsearch.tar.gz

	tar -xf elasticsearch.tar.gz
	rm elasticsearch.tar.gz
	mv elasticsearch-* elasticsearch
	sudo mv elasticsearch /usr/local/share

	data_bag("vhosts").each do \|site\|
	site_data = data_bag_item("vhosts", site)
	site_name = site_data["id"]
	document_root = "/srv/apache/#{site_name}"

	template "/etc/httpd/conf.d/#{site_name}.conf" do
	source "custom-vhosts.erb"
	mode "0644"
	variables(
	:document_root => document_root,

	---
	- hosts: server
	user: app_user
	gather_facts: False
	vars:
	user: app_user
	home_directory: "/home/{{ user }}"
	deploy_to: "{{ home_directory }}/app"

	roles:

	type 'a monoid = {zero : 'a; plus : 'a -> 'a -> 'a}
	let sum (m : 'a monoid) (l : 'a list) : 'a = List.fold_left m.plus m.zero l
	let string_summer = sum {zero = ""; plus = (^)}
	let int_summer = sum {zero = 0; plus = (+)}