Slides from my very introductory talk on Ruby 1.9 given at SD Ruby in April 2009.

1. Ruby1.9.1

2. Ruby1.9.1
Brad Feeley

3. Ruby1.9.1
Brad Feeley
I work at Digitaria

4. Ruby1.9.1
What is it?

5. Ruby1.9.1
What is it?
“ Ruby 1.9 is a new series of Ruby. It is modern,
faster, with clearer syntax, multilingualized,
a much improved version of Ruby.

6. Ruby1.9.1
Faster JRuby

7. Ruby1.9.1
Faster
New virtual machine YARV

8. Ruby1.9.1
Faster Maybe another
presentation?
New virtual machine YARV
Kernal (native) threads

9. Ruby1.9.1
Multilingualized
a.k.a. m17n

10. Ruby1.9.1
Multilingualized
File Level Encoding

11. Ruby1.9.1
Multilingualized
File Level Encoding
# encodeing: utf-8
alias π = Math::PI

12. Ruby1.9.1
Multilingualized
String Level Encoding

13. Ruby1.9.1
Multilingualized
String Level Encoding
my_string.encode(“iso-8859-1”)

14. Ruby1.9.1
Multilingualized
IO Level Encoding

15. Ruby1.9.1
Multilingualized
IO Level Encoding
f.open(‘file.txt’, ‘r:ascii’)
data = f.read
data.encoding.name
# => ‘US-ASCII’

16. Ruby1.9.1
Cleaner Syntax

17. Cleaner Syntax
Ruby1.9.1
String
No longer Enumerable

18. Cleaner Syntax
Ruby1.9.1
String
No longer Enumerable
1.8 String.ancestors
=> [String, Enumerable, Comparable, Object, Kernel]
1.9 String.ancestors
=> [String, Comparable, Object, Kernel]

19. Cleaner Syntax
Ruby1.9.1
String
No longer Enumerable
1.8 my_string_var.each { |line| puts line }
1.9 my_string_var.each_line { |line| puts line }

20. Cleaner Syntax
Ruby1.9.1
String
str = “test”
str.clear # => “”
“hellonworld”.lines # => [“hellon”, “world”]
“hello”.encoding # => “UTF-8”
“kitty”.start_with? “cat” # => false
“kitty”.end_with? “tty” # => true

21. Cleaner Syntax
Ruby1.9.1
Array

22. Cleaner Syntax
Ruby1.9.1
Array
vowels = ['a','e','i', ‘o’, ‘u’]
vowels.index{|letter| letter == 'e'} # => 1
a = [1,2,3]
a.permutation(2).to_a #=> [[1,2],[1,3],[2,1],[2,3],[3,1],[3,2]]
a.combination(2).to_a #=> [[1, 2], [1, 3], [2, 3]]
a.to_s # => “[1, 2, 3]”
a.pop(2) #=> [2, 3]

23. Cleaner Syntax
Ruby1.9.1
Hash

24. Cleaner Syntax
Ruby1.9.1
Hash
New Key Value Syntax

25. Cleaner Syntax
Ruby1.9.1
Hash
New Key Value Syntax
1.8 render :action => ‘new’

26. Cleaner Syntax
Ruby1.9.1
Hash
New Key Value Syntax
1.8 render :action => ‘new’
1.9 render action: ‘new’

27. Cleaner Syntax
Ruby1.9.1
Hash
Order Preservation
h = {:a => 1, :b => 2, :c => 3 }
h[:d] = 4
1.8 puts h.inspect => {:4 => d, :a => 1, :b => 2, :c => 3 }

28. Cleaner Syntax
Ruby1.9.1
Hash
Order Preservation
h = {:a => 1, :b => 2, :c => 3 }
h[:d] = 4
1.8 puts h.inspect => {:4 => d, :a => 1, :b => 2, :c => 3 }
1.9 puts h.inspect => {:a => 1, :b => 2, :c => 3, :4 => d }

29. Cleaner Syntax
Ruby1.9.1
Proc

30. Cleaner Syntax
Ruby1.9.1
Proc
New Declaration Syntax
1.8 say_hi = lambda { |a| “Hello, #{a}” }

31. Cleaner Syntax
Ruby1.9.1
Proc
New Declaration Syntax
1.8 say_hi = lambda { |a| “Hello, #{a}” }
1.9 say_hi = ->(a){ “Hello, #{a}” }

32. Cleaner Syntax
Ruby1.9.1
Proc
New Declaration Syntax
1.8 a = lambda { |x, y=1| x * y } #=> ERROR

33. Cleaner Syntax
Ruby1.9.1
Proc
New Declaration Syntax
1.8 a = lambda { |x, y=1| x * y } #=> ERROR
1.9 a = ->(x, y=1){ x * y }
a = ->(&x){ x.call }

34. Cleaner Syntax
Ruby1.9.1
Proc
New Calling Syntax
say_hi = lambda { |a| “Hello, #{a}” }
1.8 say_hi.call(‘Quentin’) # => Hello, Quentin

35. Cleaner Syntax
Ruby1.9.1
Proc
New Calling Syntax
say_hi = lambda { |a| “Hello, #{a}” }
1.8 say_hi.call(‘Quentin’) # => Hello, Quentin
1.9 say_hi.(‘Quentin’) # => Hello, Quentin

36. Cleaner Syntax
Ruby1.9.1
Block Scope
n = “Hello, World!”
[1,2,3].each do |n|
#do something
end

37. Cleaner Syntax
Ruby1.9.1
Block Scope
n = “Hello, World!”
[1,2,3].each do |n|
#do something
end
1.8 puts n # => 3

38. Cleaner Syntax
Ruby1.9.1
Block Scope
n = “Hello, World!”
[1,2,3].each do |n|
#do something
end
1.8 puts n # => 3
1.9 puts n # => “Hello, World!”

39. Cleaner Syntax
Ruby1.9.1
Debugging

40. Cleaner Syntax
Ruby1.9.1
Debugging
-w whitespace

41. Cleaner Syntax
Ruby1.9.1
Debugging
-w whitespace
Method#owner
#=> module the method belongs to
Method#source_location
#=> where the method is defined

42. Ruby1.9.1
Installation
http://gist.github.com/59130
wget ftp://ftp.ruby-lang.org/pub/ruby/1.9/ruby-1.9.1-p0.tar.bz2
tar -xjvf ruby-1.9.1-p0.tar.bz2
cd ruby-1.9.1-p0
./configure --prefix=/usr --program-suffix=19 --enable-shared
make && make install

43. Ruby1.9.1
Ruby on Rails

44. Ruby1.9.1
Resources
•http://www.google.com

45. Ruby1.9.1
Questions?