A talk given as a cooperative effort between Enclave Discussions and NJR in Colorado Springs at The Enclave.

1. Making Ruby Do Things
How to force Ruby into submission

2. What is Ruby?
• Ruby is a dynamic, reflective, general-
purpose object-oriented programming
language...
• A dynamic, open source programming
language with a focus on simplicity and
productivity.

3. class Person
def say something
puts something
end
end
# Create a person object
ryan = Person.new
# Have Ryan say hello!
ryan.say 'Hello there!'

4. Want to play along?
Mac Open Terminal.app
Window Do a thing?
Web http://tryruby.org

6. The Basics

7. Rule #1
Everything is an object

8. Basic Data Types and Structures
String "Hello World"
Integer 100
Range 1..50
Array [1, 2, 3]
Hash { :ruby => 'neat', :javascript => 'rad' }
Regexp /d{3}/

9. Strings and Integers

10. Strings and Integers
name = 'Ryan'

11. Strings and Integers
name = 'Ryan'
# Comparing numbers (in a hash, by the way)

12. Strings and Integers
name = 'Ryan'
# Comparing numbers (in a hash, by the way)
hours[:xbox] = 473

13. Strings and Integers
name = 'Ryan'
# Comparing numbers (in a hash, by the way)
hours[:xbox] = 473
hours[:worked] = 3

14. Strings and Integers
name = 'Ryan'
# Comparing numbers (in a hash, by the way)
hours[:xbox] = 473
hours[:worked] = 3
hours[:xbox] > hours[:worked]

15. Strings and Integers
name = 'Ryan'
# Comparing numbers (in a hash, by the way)
hours[:xbox] = 473
hours[:worked] = 3
hours[:xbox] > hours[:worked]
=> true

17. Arrays
people = [ 'Kirk', 'Andy', 'Jamie' ]
people[2]
=> 'Jamie'

18. Arrays
people = [ 'Kirk', 'Andy', 'Jamie' ]
0 1 2
people[2]
=> 'Jamie'

19. Hashes
skillz = {
ryan: [ 'Ruby on Rails', 'HTML5' ],
bob: [ 'Illustrator', 'Photoshop' ]
}
skillz[:ryan][0]
=> Ruby on Rails

20. Ranges
beers = (2..10)
beers.each do |count|
puts case count
when 2..3 then "#{count} beers? No problem!"
when 4..7 then "Approaching dangerous territory."
when 8..10 then "Seriously?? #{count} beers?"
end
end
=> 2 beers? No problem!
=> 3 beers? No problem!
=> Approaching dangerous territory.
=> ...

21. Control Structures

22. Control Structures
if condition
# do something
elsif condition
# do something
else
# do something
end

23. Control Structures
if condition case myvar
# do something when foo then "Hello!"
elsif condition when baz then "Good bye"
# do something end
else
# do something
end

24. Control Structures
if condition case myvar
# do something when foo then "Hello!"
elsif condition when baz then "Good bye"
# do something end
else
# do something while condition
end # do something
end

25. Classes and Methods
A little hot object-oriented action

26. There are all kinds of objects

27. Methods
def greet(name)
puts "Hello, #{name}!"
end

28. Classes
class Human
def greet(name)
puts "Hello, #{name}!"
end
end

29. Putting it all together
class Human
def greet(name)
puts "Hello, #{name}!"
end
end
human = Human.new
human.greet('Ryan')

30. Stop.
Demo time!
cylen.cc/F47w

31. Thanks!
• Ryan L. Cross
• Twitter: @slant
• Github: github.com/cylence
• The Enclave: enclavecoop.com
• ExtendedZombieSlayer2000
cylen.cc/F4vy