Slides for February 17 Groupon geekfest lunch

1. Ruby After 18+ Months of Clojure
-or-
Functional Learnings of Clojure for Make
Benefit of Glorious Language of Ruby*
(a work in progress)
Brian Marick, Path11
brian@path11.com, @marick
1 *Alternate title courtesy @infinitary
Wednesday, January 18, 2012

2. Ladies and Gentlemen:
The Computer
Wednesday, January 18, 2012

3. Wednesday, January 18, 2012

4. Wednesday, January 18, 2012

5. Wednesday, January 18, 2012

6. Our Friend, the Class
g()
f()
width color
scofield_v
h()
height
j()
m()
k()
4
Wednesday, January 18, 2012

7. What Are Classes Good For?
5
Wednesday, January 18, 2012

8. What Are Classes Good For?
5
Wednesday, January 18, 2012

9. The Real World Has Fuzzy Categories
6
Wednesday, January 18, 2012

10. The Real World Has Fuzzy Categories
6
Wednesday, January 18, 2012

11. Classes Are For Finding Things
g()
f()
width color
scofield_v
h()
height
j()
m()
k()
7
Wednesday, January 18, 2012

12. Classes Are For Finding Things
wsc wsc wsc
h h h
wsc wsc wsc
h h h
wsc wsc wsc
h h h
wsc wsc wsc
h h h
8
Wednesday, January 18, 2012

13. Classes Are For Finding Things
wsc wsc wsc {} [] ()
h h h
wsc wsc wsc
h h h
wsc wsc wsc
h h h
wsc wsc wsc
h h h
8
Wednesday, January 18, 2012

14. Classes Are For Finding Things
wsc wsc wsc {} [] ()
h h h
wsc wsc wsc
h h h
wsc wsc wsc
h h h
wsc wsc wsc
h h h
8
Wednesday, January 18, 2012

15. Classes Are For Finding Things
wsc wsc wsc {} [] ()
h h h
wsc wsc wsc
h h h
wsc wsc wsc
h h h
wsc wsc wsc
h h h
8
Wednesday, January 18, 2012

16. Classes Are For Finding Things
wsc wsc wsc {} [] ()
h h h
wsc wsc wsc
h h h
wsc wsc wsc
h h h
wsc wsc wsc
h h h
8
Wednesday, January 18, 2012

17. Classes Are For Finding Things
wsc wsc wsc {} [] ()
h h h
But hAth scWhat Cost?
wsc
h
wsc w
wsc wsc wsc
h h h
wsc wsc wsc
h h h
8
Wednesday, January 18, 2012

18. 9
Wednesday, January 18, 2012

19. Lookup
10
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20. Lookup
10
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21. 11
Wednesday, January 18, 2012

22. Lookup
Copy
12
Wednesday, January 18, 2012

23. Lookup
?Copy
12
Wednesday, January 18, 2012

24. Lookup
?Copy
12
Wednesday, January 18, 2012

25. 13
Wednesday, January 18, 2012

26. Do The Simplest Thing
That Could
Possibly Work
13
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27. Active
Record
14
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28. Wait. What?
Active
Record
14
Wednesday, January 18, 2012

29. id
c
Lookup
timeslice
uses
Copy
15
Wednesday, January 18, 2012

30. Lookup
id
uses
c
timeslice
Copy
15
Wednesday, January 18, 2012

31. Lookup
id
uses
c
timeslice
Copy
16
Wednesday, January 18, 2012

32. Lookup
id
c timeslice
Copyuses
16
Wednesday, January 18, 2012

33. Lookup
id
c c
copy tim
use
id
Copy c
omitted_
animals
id
u ti
c u ti
17
Wednesday, January 18, 2012

34. Lookup
copy
c
omitted_ id
id
tim
use c
animals
c
Copyid
u ti
c u ti
17
Wednesday, January 18, 2012

35. Lookup
id
tim
use c
copy
omitted_
c id
animals
c
Copyid
u ti
c u ti
17
Wednesday, January 18, 2012

36. Lookup
id
tim
use c
copy
omitted_
c
animals
Copy
id
c
u ti
id
c
u ti
17
Wednesday, January 18, 2012

37. Lookup
id
tim
use c
copy
omitted_
c
animals
Copy
id
c
u ti
id
c
u ti
18
Wednesday, January 18, 2012

38. Lookup
Copy
18
Wednesday, January 18, 2012

39. Lookup
Copy
19
Wednesday, January 18, 2012

40. Lookup
Copy
19
Wednesday, January 18, 2012

41. 20
Wednesday, January 18, 2012

42. 20
Wednesday, January 18, 2012

43. Lookup
Copy
21
Wednesday, January 18, 2012

44. Lookup
Copy
21
Wednesday, January 18, 2012

45. and...
22
Wednesday, January 18, 2012

46. and...
22
Wednesday, January 18, 2012

47. 23
Wednesday, January 18, 2012

48. {}
23
Wednesday, January 18, 2012

49. {}
23
Wednesday, January 18, 2012

50. {} {}
{}
{}
{} {}
{}
{}
{}
{} {}
24
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51. 25
Wednesday, January 18, 2012

52. 25
Wednesday, January 18, 2012

53. 26
Wednesday, January 18, 2012

54. 27
Wednesday, January 18, 2012

55. 27
Wednesday, January 18, 2012

56. Immutability
28
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57. Immutability
28
Wednesday, January 18, 2012

58. Immutability
28
Wednesday, January 18, 2012

59. Hygiene
29
Wednesday, January 18, 2012

60. Hygiene
“You’ve slept with everyone
everyone you’ve ever slept with
ever slept with.”
29
Wednesday, January 18, 2012

61. Hygiene
“You’ve slept with everyone
everyone you’ve ever slept with
ever slept with.”
“Your code might be infected by any
code that has ever touched your data.”
29
Wednesday, January 18, 2012

62. Hygiene
a=
“You’ve slept with everyone
everyone you’ve ever slept with
ever slept with.”
“Your code might be infected by any
code that has ever touched your data.”
29
Wednesday, January 18, 2012

63. Hygiene
a=
“You’ve slept with everyone
everyone you’ve ever slept with
ever slept with.”
“Your code might be infected by any
code that has ever touched your data.”
a
29
Wednesday, January 18, 2012

64. Hygiene
a=
“You’ve slept with everyone
everyone you’ve ever slept with
ever slept with.”
“Your code might be infected by any
code that has ever touched your data.”
a
29
Wednesday, January 18, 2012

65. Consequences
30
Wednesday, January 18, 2012

66. Consequences
30
Wednesday, January 18, 2012

67. Consequences
5
31
Wednesday, January 18, 2012

68. Consequences
5
32
Wednesday, January 18, 2012

69. Consequences
5
32
Wednesday, January 18, 2012

70. Consequences
5
32
Wednesday, January 18, 2012

71. 33
Wednesday, January 18, 2012

72. In Short: Why Not?
34
Wednesday, January 18, 2012

73. In Short: Why Not?
• Removes one source of bugs
34
Wednesday, January 18, 2012

74. In Short: Why Not?
• Removes one source of bugs
• Not harder than coding mutably
• (once you’re used to it)
34
Wednesday, January 18, 2012

75. In Short: Why Not?
• Removes one source of bugs
• Not harder than coding mutably
• (once you’re used to it)
• Knowing how to do more is better than
knowing how to do less
34
Wednesday, January 18, 2012

76. Ruby
35
Wednesday, January 18, 2012

77. Ruby
35
Wednesday, January 18, 2012

78. Ruby
Haskell
35
Wednesday, January 18, 2012

79. Ruby
Haskell
35
Wednesday, January 18, 2012

80. Ruby
Haskell Always Lazy
35
Wednesday, January 18, 2012

81. Ruby Mostly Eager
Haskell Always Lazy
35
Wednesday, January 18, 2012

82. Some Lazy Ruby
36
Wednesday, January 18, 2012

83. Some Lazy Ruby
37
Wednesday, January 18, 2012

84. Some Lazy Ruby
Only a few special Ruby operators are lazy
37
Wednesday, January 18, 2012

85. And Why Not?
38
Wednesday, January 18, 2012

86. And Why Not?
39
Wednesday, January 18, 2012

87. a=
40
Wednesday, January 18, 2012

88. a=
40
Wednesday, January 18, 2012

89. a=
a
a
40
Wednesday, January 18, 2012

90. a=
a
a
40
Wednesday, January 18, 2012

91. a=
a
a
40
Wednesday, January 18, 2012

92. a=
a
a
40
Wednesday, January 18, 2012

93. One
Less
Thing
a=
to
Worry
About
a
a
40
Wednesday, January 18, 2012

94. 41
Wednesday, January 18, 2012

95. a=
a
a
free(a)
42
Wednesday, January 18, 2012

96. a=
a
a
42
Wednesday, January 18, 2012

97. a=
a
a
43
Wednesday, January 18, 2012

98. 44
Wednesday, January 18, 2012

99. OMG!!! As Big
As Garbage
Collection???
44
Wednesday, January 18, 2012

100. OMG!!! As Big
As Garbage
Collection???
Calculations
You Trace
Through Time
44
Wednesday, January 18, 2012

101. OMG!!! As Big
As Garbage
Collection???
Calculations Resources You
You Trace Consume
Through Time As Needed
44
Wednesday, January 18, 2012

102. Lazy Sequences
45
Wednesday, January 18, 2012

103. Lazy Sequences
45
Wednesday, January 18, 2012

104. Lazy Sequences
45
Wednesday, January 18, 2012

105. What You Get With Lazy Sequences
Don’t Like
46
Wednesday, January 18, 2012

106. What You Get With Lazy Sequences
Don’t Like
How to
Make the
Next One
46
Wednesday, January 18, 2012

107. What You Get With Lazy Sequences
Don’t Like
How to
Make the
Next One
46
Wednesday, January 18, 2012

108. What You Get With Lazy Sequences
Don’t Like
Which
Ones
How to
Make the
Next One
46
Wednesday, January 18, 2012

109. What You Get With Lazy Sequences
Don’t Like
Which
Ones
How to
Make the
Next One
46
Wednesday, January 18, 2012

110. What You Get With Lazy Sequences
Like
Wednesday, January 18, 2012

111. What You Get With Lazy Sequences
Like
Wednesday, January 18, 2012

112. What You Get With Lazy Sequences
Like
How to
Make the
Next One
Wednesday, January 18, 2012

113. What You Get With Lazy Sequences
Like
How to
Make the
Next One
Which
Ones
Wednesday, January 18, 2012

114. github.com/marick/stunted
Google groups:
rubyfoopers
48
Wednesday, January 18, 2012

115. object.f(2, 3, 4)
def Float, Integer ...
def Integer, Float
f.(2.0, 2)
49
Wednesday, January 18, 2012

116. github.com/marick/stunted
Google groups:
rubyfoopers
Expressiveness
Efficiency
Gems
50
Wednesday, January 18, 2012