Bruce Park treble37

Elixir installation guide

Version numbers should be the ones you want. Here I do it with the last ones available at the moment of writing.

The simplest way to install elixir is using your package manager. Sadly, at the time of writing only Fedora shows the intention to keep its packages up to date. There you can simply sudo dnf install erlang elixir and you are good to go.

Anyway, if you intend to work with several versions of erlang or elixir at the same time, or you are tied to a specific version, you will need to compile it yourself. Then asdf is your best friend.

Git Submodules basic explanation

Why submodules?

In Git you can add a submodule to a repository. This is basically a repository embedded in your main repository. This can be very useful. A couple of advantages of using submodules:

You can separate the code into different repositories.

Using Git

Global Settings

Related Setup: https://gist.github.com/hofmannsven/6814278

Related Pro Tips: https://ochronus.com/git-tips-from-the-trenches/

This guide assumes that you recently run brew upgrade postgresql and discovered to your dismay that you accidentally bumped from one major version to another: say 9.3.x to 9.4.x. Yes, that is a major version bump in PG land.

First let's check something.

brew info postgresql

The top of what gets printed as a result is the most important:

###Quick links to get started:

http://nithinbekal.com/posts/rails-presenters/

http://eewang.github.io/blog/2013/09/26/presenting-the-rails-presenter-pattern/

Thoughts about Rails Presenters

This is a collection of links, examples and rants about Presenters/Decorators in Rails.

Algorithms: Design and Analysis, Part 2

The course will have six weeks of lectures and assignments, followed by a final exam.

Week 1

I. TWO MOTIVATING APPLICATIONS

Distributed shortest-path routing -- sending email messages

GeoPlanet data with ancestor chain cache imported in 10 minutes

Yahoo! provides its GeoPlanet data as three separate TSV files, available for download here.

That's a database with some 17 million records:

5.7 million records: locations (aka places).
2.2 million records: alternative names for each place (aka aliases).
9.6 million records: matrix of neighbourhoods per place (aka adjacencies).

	require 'fiddle'
	public def class=(new_class)
	obj_ptr = Fiddle::Pointer.new 2*self.object_id
	klass_ptr = Fiddle::Pointer.new 2*new_class.object_id
	obj_ptr[8, 8] = klass_ptr.ref[0, 8]
	end

	class A
	attr_accessor :a, :b, :c
	end

	#!/usr/bin/env ruby
	require "openssl"
	require 'digest/sha2'
	require 'base64'

	# We use the AES 256 bit cipher-block chaining symetric encryption
	alg = "AES-256-CBC"

	# We want a 256 bit key symetric key based on some passphrase
	digest = Digest::SHA256.new

	# Video: http://rubyhoedown2008.confreaks.com/08-chris-wanstrath-keynote.html

	Hi everyone, I'm Chris Wanstrath.

	When Jeremy asked me to come talk, I said yes. Hell yes. Immediately. But
	then I took a few moments and thought, Wait, why? Why me? What am I supposed
	to say that's interesting? Something about Ruby, perhaps. Maybe the
	future of it. The future of something, at least. That sounds
	keynote-y.