The document discusses the key new features in Ruby 2.0, including improved compatibility with Ruby 1.9, new literal symbol lists, keyword arguments, module prepend, lazy enumerators, refinements, and an improved garbage collection system using bitmap marking. It also provides an overview of installing Ruby and Rails using RVM.

1. O que tem de novo no
Ruby 2?
Fabio Akita
@akitaonrails
codeminer42.com

4. Ruby 0.95 Dez 1995
Ruby 1.8 Ago 2003
Rails 0.8 Dez 2005
Ruby 1.9 Dez 2007

5. Ruby 0.95 Dez 1995
Ruby 1.8 Ago 2003
Rails 0.8 Dez 2005
Ruby 1.9 Dez 2007

6. Ruby 0.95 Dez 1995
Ruby 1.8 Ago 2003
Rails 0.8 Dez 2005
Ruby 1.9 Dez 2007

7. Ruby 0.95 Dez 1995
Ruby 1.8 Ago 2003
Rails 0.8 Dez 2005
Ruby 1.9 Dez 2007

8. Ruby 2.0
24 de Fevereiro de 2013

9. Compatível com 1.9

10. Literal Symbol List

11. > %q[hello world]
=> "hello world"
> %i[hello world]
=> [:hello, :world]

12. Keyword Arguments

13. def foo(options = {})
param1 = options[:param1]
param2 = options[:param2]
return [param1, param2]
end
> foo param1: "Hello", param2: "World"
=> ["Hello", "World"]

14. def foo(param1: nil, param2: nil)
return [param1, param2]
end
> foo param1: "Hello", param2: "World"
=> ["Hello", "World"]

15. Module Prepend

16. > [1,2,3].to_s
=> "[1, 2, 3]"

17. module Foo
def self.included(base)
base.class_eval do
alias_method :original_to_s, :to_s
def to_s
original_to_s + ", Foo"
end
end
end
end
class Array
include Foo
end

18. > [1,2,3].to_s
=> "[1, 2, 3], Foo"
> Array.ancestors
=> [Array, Foo, Enumerable, Object, Kernel,
BasicObject]

19. module Foo
def to_s
super + ", Foo"
end
end
class Array
prepend Foo
end

20. > [1,2,3].to_s
=> "[1, 2, 3], Foo"
> Array.ancestors
=> [Foo, Array, Enumerable, Object, Kernel,
BasicObject]

21. Lazy Enumerators

22. > a = (0..3).map { |i| i }
=> [0, 1, 2, 3]

23. > a = (0..3).lazy.map { |i| i }
=> #<Enumerator::Lazy: #<Enumerator::Lazy: 0..3>:map>
> a.next
=> 0
> a.next
=> 1
> a.next
=> 2
> a.next
=> 3

24. > a = (0..Float::INFINITY).lazy.map { |i| i }
=> #<Enumerator::Lazy: #<Enumerator::Lazy:
0..Infinity>:map>
> a.next
=> 0
> a.next
=> 1
> a.next
=> 2
> a.next
=> 3

25. Refinements

26. module Foo
def hello
"Hello, #{to_s}"
end
end
class Array
include Foo
end
> [1,2,3].hello
=> "Hello, [1, 2, 3]"

27. module Foo
refine Array do
def hello
"Hello, #{to_s}"
end
end
end
using Foo
> [1,2,3].hello
=> "Hello, [1, 2, 3]"

28. module Foo def bah
refine Array do [1,2,3].hello
def hello end
"Hello, #{to_s}"
end > bah.hello
end NoMethodError: undefined
end method `hello' for
"Hello, [1, 2,
using Foo 3]":String
> [1,2,3].hello
=> "Hello, [1, 2, 3]"

29. http://rvm.io

30. curl -L https://get.rvm.io | bash -s stable --rails --autolibs=enabled

35. http://gembundler.com/

40. Browser
NGINX
Worker
Linux

41. Browser
NGINX
Worker
Linux

42. Browser
NGINX
Worker
Ruby
Linux

43. Browser
NGINX
Worker
Rails
Ruby
Linux

44. Browser
NGINX
Worker
Rails
Ruby
Linux

45. Browser Browser Browser Browser
NGINX
Worker Worker Worker Worker
Rails Rails Rails Rails
Ruby Ruby Ruby Ruby
Linux

46. Browser Browser Browser Browser
NGINX
Worker Worker Worker Worker
Rails Rails Rails Rails
Ruby Ruby Ruby Ruby
Linux

47. M&S
Mark & Sweep GC

48. struct RBasic {
VALUE flags; RString
flags
VALUE klass; klass
};

49. RString RString RString
flags flags flags
klass klass klass

50. RString RString RString
flags flags flags
klass klass klass
fork()

51. RString RString RString
flags flags flags
klass klass klass
fork()

52. RString RString RString
flags flags flags
klass klass klass
GC.start()
RString RString RString
flags flags flags
klass klass klass

53. OOBW
Out of Band Work

56. Lazy
Lazy Sweep GC - Ruby 1.9.3

57. “CoW”
Copy on Write

58. RString RString RString
flags flags flags
klass klass klass

59. RString RString RString
flags flags flags
klass klass klass

60. RString RString RString
flags flags flags
klass klass klass

61. RString RString RString
flags flags flags
klass klass klass

63. fork()

68. GC.start

73. Bitmap
Bitmap Marking GC - Ruby 2.0

76. 9 00001001
8 00001000
7 00000111

77. 9 00001001
8 00001000
7 00000111

78. 9 00001001
8 00001000
7 00000111

80. 00000001 2^0 1 User
00000010 2^1 2 Moderator
00000100 2^2 4 Administrator

81. 00000001 2^0 1 User
00000010 2^1 2 Moderator
00000100 2^2 4 Administrator

82. 00000001 2^0 1 User
00000010 2^1 2 Moderator
00000100 2^2 4 Administrator

83. 1 1 1 0 0 0 0 0 0 0 0

84. 1 1 1 0 0 0 0 0 0 0 0
fork()

85. fork()

86. fork()

87. Browser Browser Browser Browser
NGINX
Worker Worker Worker Worker
Rails Rails Rails Rails
Ruby Ruby Ruby Ruby
Linux

88. Browser
Browser
Browser
Browser
Browser
Browser
Browser
Browser
Browser
Browser
NGINX
Worker Worker
Worker Worker
Worker
Worker
Worker
Worker
Worker
Worker
Rails Rails Rails Rails Rails Rails Rails Rails Rails Rails
RubyRuby Ruby Ruby Ruby Ruby Ruby Ruby Ruby Ruby
Linux

89. Browser
Browser
Browser
Browser
Browser
Browser
Browser
Browser
Browser
Browser
NGINX
Worker Worker
Worker Worker
Worker
Worker
Worker
Worker
Worker
Worker
Rails Rails Rails Rails Rails Rails Rails Rails Rails Rails
RubyRuby Ruby Ruby Ruby Ruby Ruby Ruby Ruby Ruby
Linux

90. Rails 3.2.12+
Rails 4.0

91. Thanks!
@akitaonrails