Slides for my Ruby landscape talk at Pretoria.rb - http://www.meetup.com/pretoria-rb/events/186593022

1. puts "Hello PTA!"
# Why Ruby?

2. whoami = {
name: "Kenneth Kalmer",
twitter: "@kennethkalmer",
github: "kennethkalmer",
blog: "opensourcery.co.za"
}
!

3. class History
def when?
1995
end
def where?
"Japan"
end
def by?
"Matz"
end
end
!

4. [1] pry(main)> class History
[1] pry(main)*
[1] pry(main)* def when?
[1] pry(main)* 1995
[1] pry(main)* end
[1] pry(main)*
[1] pry(main)* def where?
[1] pry(main)* "Japan"
[1] pry(main)* end
[1] pry(main)*
[1] pry(main)* def by?
[1] pry(main)* "Matz"
[1] pry(main)* end
[1] pry(main)*
[1] pry(main)* end
=> :by?
[2] pry(main)> lesson = History.new
=> #<History:0x007fcdb306a3f0>
[3] pry(main)> lesson.when?
=> 1995
[4] pry(main)> lesson.where?
=> "Japan"
[5] pry(main)> lesson.by?
=> "Matz"

6. $ gem install pry
Fetching: pry-0.10.0.gem (100%)
Successfully installed pry-0.10.0
1 gem installed
!
$ pry
[1] pry(main)> 1 + 1
=> 2

7. $ pry
[1] pry(main)> 1.is_a?( Object ) && 1.is_a?( Fixnum )
=> true
!
[2] pry(main)> true.is_a?( Object ) && true.is_a?( TrueClass )
=> true
!
[3] pry(main)> nil.is_a?( Object ) && nil.is_a?( NilClass )
=> true
!
[4] pry(main)> "PTA".is_a?( Object ) && "PTA".is_a?( String )
=> true

8. $ pry
[1] pry(main)> 1.object_id == 1.object_id
=> true
!
[2] pry(main)> "PTA".object_id == "PTA".object_id
=> false

9. $ pry
[1] pry(main)> require 'nokogiri'
=> true
!
[2] pry(main)> require 'open-uri'
=> true
!
[3] pry(main)> doc = Nokogiri::HTML(open("http://en.wikipedia.org/wiki/
Ruby_(programming_language)"))
=> #(Document:0x3fe11d253454…)
!
[4] pry(main)> paragraph = doc.search('//*[@id="mw-content-text"]/p[23]').text
=> "Matsumoto has said that Ruby is designed for…”
!
[5] pry(main)> paragraph =~ /"([^"]*)/
=> 194
!
[6] pry(main)> $1
=> "I hope to see Ruby help every programmer in the world to be productive, and
to enjoy programming, and to be happy. That is the primary purpose of Ruby
language."

11. The Main Runtimes

12. The Interesting Runtimes

13. The Mobile Runtimes

15. required “reading”
http://mislav.uniqpath.com/poignant-guide/

16. 3,239,798,210
downloads
of 77,207 gems cut since July 2009

17. require “*”
• State of the art dependency
management
• Authors now building the same tool for
the Rust programming language

18. require “sinatra”
get "/" do
"<h1>Hello PTA</h1>"
end
• Rack
• Sinatra
• Padrino
• Rails

19. require “adhearsion”
class MyController < Adhearsion::CallController
def run
answer
resp = ask "How many woodchucks?", :limit => 1
say "You said #{resp}. That's obviously wrong!"
end
end
!
# adhearsion.com

20. require “artoo”
connection :sphero, adaptor: :sphero, port: '4560'
device :sphero, driver: :sphero
!
work do
every(3.seconds) do
puts "Rolling..."
sphero.roll 60, rand(360)
end
end
!
# artoo.io

22. require “relevance”

23. Tools of the
trade

25. require “simple_form”
simple_form_for @user do |f|
= f.input :email
= f.input :password
= f.submit "Login"
• Rapid form
building
• Highlight errors
• Wrappers for
Bootstrap

26. require “better_errors”

27. require “reform”
class SongForm < Reform::Form
property :title
property :length
!
validates :title, presence: true
validates :length, numericality: true
end
!
class SongsController
def new
@form = SongForm.new(Song.new)
end

28. require
“active_interaction”
• Model business processes as simple
objects.
• Avoid the callback hell that so easily
happens in models

30. http://iwanttolearnruby.com/

31. trap("TERM") do
puts "WIN"
end
!
exit