Ruby is just over 20 years old. It's no longer young or hip, and that’s a good thing! In the last decade, Ruby has matured as a web technology. It's being used in many successful companies out there such as Hulu, GitHub, and Bloomberg. The ecosystem is comprised of many stable libraries and tools to handle most common web tasks, allowing you to focus on adding features to improve your product and better serve your customers. We'll talk about how you can build scalable and reliable software, but still maintain fast development turnaround by leveraging the maturity and creativity of the Ruby community.

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Using Ruby for Reliability,
Consistency, and Speed
Terence Lee, Ruby Task Force Lead
@hone02

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@hone02

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Austin, TX

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Ruby Task Force

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Ruby Task Force
ruby-core

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Ruby Task Force
ruby-core
bundler-core

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Goals – Presentation Overview
1 2 3
History Ruby Everywhere Ecosystem

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History

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“I believe that the purpose of life is, at least in
part, to be happy. Based on this belief, Ruby is
designed to make programming not only easy
but also fun. It allows you to concentrate on the
creative side of programming, with less stress.”
- Yukihiro Matsumoto, “Matz”, まつもとゆきひろ

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Japan - 1993

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1995 - Ruby 0.95

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1995 - Ruby 0.95
1995 - Java 1.0

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1995 - Ruby 0.95
1995 - Java 1.0
1996 - Ruby 1.0

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1995 - Ruby 0.95
1995 - Java 1.0
1996 - Ruby 1.0
2000 - Programming Ruby Released
2003 - Ruby 1.8

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1995 - Ruby 0.95
1995 - Java 1.0
1996 - Ruby 1.0
2000 - Programming Ruby Released
2003 - Ruby 1.8
2007 - Ruby 1.9

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1995 - Ruby 0.95
1995 - Java 1.0
1996 - Ruby 1.0
2000 - Programming Ruby Released
2003 - Ruby 1.8
2007 - Ruby 1.9
2011 - Ruby 1.9.3

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1995 - Ruby 0.95
1995 - Java 1.0
1996 - Ruby 1.0
2000 - Programming Ruby Released
2003 - Ruby 1.8
2007 - Ruby 1.9
2011 - Ruby 1.9.3
2/2013 - Ruby 2.0.0
12/2013 - Ruby 2.1.0

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1995 - Ruby 0.95
1995 - Java 1.0
1996 - Ruby 1.0
2000 - Programming Ruby Released
2003 - Ruby 1.8
2007 - Ruby 1.9
2011 - Ruby 1.9.3
2/2013 - Ruby 2.0.0
12/2013 - Ruby 2.1.0
12/2014 - Ruby 2.2.0

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Design

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Fuji is the new Leica
"Fuji is the new Leica. It's
true! Fuji is making the world's
best cameras, in every way,
especially when it comes to
functional design
considerations. They are the
only company that putting a
priority on Human-Centered
Design that isn't also charging
$7,000 for their cameras."

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"Often people, especially computer engineers,
focus on the machines. But in fact we need to
focus on humans, on how humans care about
doing programming or operating the application
of the machines."
- Yukihiro Matsumoto, “Matz”, まつもとゆきひろ

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puts 'Hello World!'
Hello World!

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puts 'Hello World!'
Hello World!
(1..5).each {|i| puts i }
1
2
3
4
5

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COLORS = { black: "000",
blue: "00f",
white: "fff" }
class String
COLORS.each do |color,code|
define_method "in_#{color}" do
"<span style="color: ##{code}">#{self}</span>"
end
end
end
puts "Hello World".in_blue
"<span style="color: #00f">Hello, World!</span>"

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Ruby Everywhere

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Companies Using Ruby
Amazon
Good Reads
Hulu
Cookpad
Bloomberg
New York Times
Basecamp
Red Hat

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mruby
#include <stdio.h>
#include <mruby.h>
#include <mruby/compile.h>
int main(void) {
mrb_state *mrb = mrb_open();
char code[] = "5.times { puts 'mruby is
awesome!' }";
printf("Executing Ruby code with mruby:n");
mrb_load_string(mrb, code);
mrb_close(mrb);
return 0;
}

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RubyMotion
Command line based tooling for iOS,
Mac, and Android.
Basecamp
Frontback
Jukely
Bandcamp

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PLACEHOLDER SCREEN

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JRuby
$ jruby -S jirb_swing
require 'java'
frame = javax.swing.JFrame.new("Window")
label = javax.swing.JLabel.new("Hello")
frame.add(label)
frame.setDefaultCloseOperation(javax.swing.JFrame::EXIT_ON_CLOSE)
frame.pack
frame.setVisible(true)

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JRuby + Truffle Benchmarks
PLACEHOLDER SCREEN

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Ecosystem

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RubyGems
$ gem install bundler
3,692,537,013 downloads
88,959 gems cut since July 2009

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Bundler
# Gemfile
source "https://rubygems.org"
gem 'rspec', ‘~> 3.0.0’

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Bundler
$ bundle install
Fetching gem metadata from https:
//rubygems.org/.........
Resolving dependencies...
Using bundler 1.6.2
Installing rspec-support 3.1.0
Installing diff-lcs 1.2.5
Installing rspec-mocks 3.1.1
Installing rspec-expectations 3.1.1
Installing rspec-core 3.1.4
Installing rspec 3.1.0
Your bundle is complete!

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Bundler
# Gemfile.lock
GEM
remote: https://rubygems.org/
specs:
diff-lcs (1.2.5)
rspec (3.1.0)
rspec-core (~> 3.1.0)
rspec-expectations (~> 3.1.0)
rspec-mocks (~> 3.1.0)
rspec-core (3.1.4)
rspec-support (~> 3.1.0)
rspec-expectations (3.1.1)
diff-lcs (>= 1.2.0, < 2.0)
rspec-support (~> 3.1.0)
rspec-mocks (3.1.1)
rspec-support (~> 3.1.0)
rspec-support (3.1.0)
PLATFORMS
ruby
DEPENDENCIES
rspec

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Bundler
# Gemfile
ruby '2.1.2'
gem 'rack'
$ bundle install
Your Ruby version is 1.9.3, but your
Gemfile specified 2.1.2

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Build Web Apps

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Rack
# Gemfile
gem 'rack'
# config.ru
run Proc.new {|env|
['200',
{'Content-Type' => 'text/html'},
['Hello World!']]
}
$ bundle exec rackup

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Sinatra
require 'sinatra'
get '/hi' do
"Hello World!"
end
$ gem install sinatra
$ ruby hi.rb
== Sinatra has taken the stage ...
>> Listening on 0.0.0.0:4567
$ curl http://localhost:4567
Hello World!

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Ruby on Rails
$ gem install rails
$ rails new hi
create
create README.rdoc
create Rakefile
create config.ru
create .gitignore
create Gemfile
create app
...

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Ruby on Rails
app/controllers/
app/helpers/
app/models/
app/mailers/
app/views/

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ActiveRecord
class Article < ActiveRecord::Base
validates_presence_of :url
before_create :summarize
def summarize
...
end
end

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ActionController
class ArticlesController < ApplicationController
def index
@articles = Article.all
@article = Article.new
end
def show
respond_to do |format|
format.html { render :file => "#{Rails.root}/public/404.html", :status
=> 404 }
format.json { render :show }
end

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Generators
$ bin/rails generate scaffold
$ bin/rails generate controller
$ bin/rails generate model
$ bin/rails generate migration
$ bin/rails generate helper
$ bin/rails generate mailer

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Ruby on Rails
config/
config/environments/
db/
db/migrate/
public/
vendor/

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Ruby on Rails
app/assets/
app/assets/images/
app/assets/javascripts/
app/assets/stylesheets/
$ bin/rake assets:precompile
image-
908e25f4bf641868d8683022a5b62f54.jpg

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Content Delivery Network (CDN)
$ heroku addons:add fastly
# config/environments/production.rb
config.action_controller.asset_host = ENV['FASTLY_CDN_URL']
config.static_cache_control = 'public, s-maxage=2592000, maxage=86400'

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Background Queuing

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Sidekiq
# Gemfile
gem 'sidekiq'
# job.rb
class Job
include Sidekiq::Worker
def perform(path, host, port = 80)
http = Net::HTTP.new(host, port)
http.request(Net::HTTP::Get.new(path)
end
end

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Sidekiq
# queue job
Job.perform_async("/api/v1/foo", "heroku.com")
$ bundle exec sidekiq -r ./job.rb -c 10

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Sidekiq
# queue job
Job.perform_async("/api/v1/foo", "heroku.com")
$ bundle exec sidekiq -r ./job.rb -c 20

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Screenshot description here.
Container resizes as needed
PLACEHOLDER SCREEN

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Web Servers

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Puma
# Gemfile
gem 'puma'
$ bundle exec puma

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Puma
# Gemfile
gem 'puma'
$ bundle exec puma -t 8:32 -w 3

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Testing

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RSpec
# Gemfile
gem 'rspec'
# my_class_spec.rb
describe MyClass do
before { ... }
let(:foo) { MyClass.new }
it 'accesses the example' do
expect(foo.bar).to eq("bar")
end
end

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rspec-mocks
book = double("book", :pages => 250)

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rspec-mocks
book = double("book", :pages => 250)
allow(book).to receive(:title) { "The RSpec Book" }

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rspec-mocks
book = double("book", :pages => 250)
allow(book).to receive(:title) { "The RSpec Book" }
it "calculates the read time" do
book = double("book")
expect(book).to receive(:read_time) { 12.4 }
user.reads(book)
end

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Artifice
# Gemfile
gem 'artifice'
# test file
class MockEndpoint < Sinatra::Base
get "/endpoint" do
"foo bar"
end
end
Artifice.activate_with(MockEndpoint) do
# make some requests using Net::HTTP
end

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rspec-rails
RSpec.describe User, :type => :model do
it "orders by last name" do
lindeman = User.create!(first_name: "Andy", last_name: "Lindeman")
chelimsky = User.create!(first_name: "David", last_name: "Chelimsky")
expect(User.ordered_by_last_name).to eq([chelimsky, lindeman])
end
end

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rspec-rails
RSpec.describe PostsController, :type => :controller do
describe "GET #index" do
it "responds successfully with an HTTP 200 status code" do
get :index
expect(response).to be_success
expect(response).to have_http_status(200)
end
end
end

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Frontend Development

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ember.js
# Gemfile
gem 'ember-rails'
$ bin/rails generate ember:bootstrap
in app/assets/javascripts/:
controllers/
helpers/
components/
models/
routes/
templates/components
views/

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Security

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Miscellaneous

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require 'pismo'
require 'sentimental'
require 'ots'
require 'tokenizer'
class Article
def summarize
doc = Pismo::Document.new(self.url)
sent = Sentimental.new
tokenizer = Tokenizer::Tokenizer.new
tokens = tokenizer.tokenize(doc.body)
poly_syl = tokens.select {|word| Lingua::EN::Syllable.syllables(word) >= 3 }.size
self.title = doc.title
self.image = doc.images.blank? ? nil : doc.images.first
self.topics = OTS.parse(doc.body).topics
self.sentiment = sent.get_sentiment(doc.body)
self.words = tokens.size
self.difficulty = smog(poly_syl, doc.sentences.size || 1) / 12
wpm = (200 - 100 * self.difficulty) || 1
self.minutes = (self.words / wpm.to_f).ceil
end
end

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Future

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the metal m/
• separate middleware
• API for request/response objects
• request has read I/O for post body
• response has write I/O for output

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Ruby 3.0
• Concurrency
• JIT compiler
• Static Typing

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Wrapup

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Ruby is not young. It may not
even be hip, but it has a rich 20
year history.

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There are many
implementations of Ruby that
can fit all shapes, sizes, and
purposes.

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There's a vibrant ecosystem of
libraries, tools, and practices
surrounding Ruby.

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Ruby has a rich
history.
There's a Ruby for all
kinds of shapes and
sizes.
There's a vibrant
ecosystem of
libraries, tools, and
practices surrounding
Ruby.
Recap Slide
1 2 3

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Questions?

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One more thing...

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Friday Hug!

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CUSTOMER JOURNEY
SHOWCASE
MARKETING
THOUGHT LEADERS
EMAIL MARKETING PRODUCT STRATEGY
& ROADMAP
PERSONAL
TRANSFORMATION
& GROWTH
SOCIAL MARKETING MOBILE & WEB
MARKETING
DEVELOPERS HANDS-ON
TRAINING
INDUSTRY
TRENDSETTERS
CREATIVITY &
INNOVATION
SALESFORCE FOR
MARKETERS
ROUNDTABLES