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When $a \ne 0$, there are two solutions to $(ax^2 + bx + c = 0)$ and they are $$ x = {-b \pm \sqrt{b^2-4ac} \over 2a} $$

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1. Programming Ruby: the classic “pick-axe” book. it’s a tome — i haven’t read it cover-to-cover. i think it’s useful for the first few chapters & then coming back to it as a reference when i need to get more in-depth on a topic: https://pragprog.com/book/ruby4/programming-ruby-1-9-2-0 — i’m a bit surprised that it seems not to have been updated for Ruby 2.1, 2.2, 2.3, or 2.4 :)

2. Ruby Koans: I found this really useful for getting over the initial learning curve with Ruby. Fun and approachable. http://rubykoans.com/ — I think this is also a bit dated, though likely still great for fundamentals

3. Michael Hartl’s Ruby on Rails Tutorial helped me get over the initial learning curve with Rails.

4. Learn Ruby the Hard Way — I have not read this one. It’s the newest learning-Ruby book that I know of, and I generally have a positive opinion of Zed Shaw’s “* the Hard Way” series.

I would recommend #4 and maybe #2 to someone starting with Ruby. #3 if you want to make sense of Rails. #1 as a reference, tho

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[Ignite] Three ways to automate application deployment to Amazon Web Services

Comparing and contrasting full-stack automated app deployment using:
* Ansible, a task-centric tool with uses from configuration management to cloud provisioning
* Terraform, an model-/graph-centric tool for cloud provisioning
* Convox, a Heroku-like open source Platform-as-a-Service offering that can be deployed into your Amazon Web Services account

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SUBMODULE=lib/ansible/modules/core
SUBMODULE_COMMIT=4d9ce9cf2cdee14b1c417e92059d4ef83dbcc457

for superproject_tag in $(git tag); do
  git ls-tree -r $superproject_tag | grep $SUBMODULE | awk '{ print $3 }' | while read submodule_commit_in_superproject_tag; do
    (cd $SUBMODULE && git rev-list $submodule_commit_in_superproject_tag | grep $SUBMODULE_COMMIT >/dev/null && echo "Found submodule commit in superproject tag $superproject_tag")
  done
done

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Another CoreOS gist

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Hello again

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Where is your domain model?

A domain model is much more than the “M” in MVC. As Martin Fowler writes, “Learning how to design and use a Domain Model is a significant exercise--one that has led to many articles on the ‘paradigm shift’ of objects use.”

Let’s talk about evolving a domain model in sustainable ways that allow a codebase to organically grow in a way that supports agility and adaptability. Highlights include:

• What is a domain model? What are the alternatives?
• What is sustainable software development?
• Ubiquitous language, and thinking twice about naming something a Manager, Service, or DAO

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module Enumerable
  def sum(identity=0)
    inject(identity) { |sum,each| sum + each }
  end
end

class BowlingGame
  class Frame
    def initialize
      @rolls = []

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class Integer
  def factorial
    raise if self < 0
    self > 0 ? (1..self).reduce(&:*) : 1
  end
end

describe Integer, '#factorial' do
  context "for values larger than 1" do
    example { 2.factorial.should == 2*1 }

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import org.junit.Test;

import java.util.EmptyStackException;
import java.util.Stack;

import static org.hamcrest.core.Is.is;
import static org.junit.Assert.assertThat;

public class StackTest {
    Stack<String> stack = new Stack<String>();