My talk from 2013 Ruby Kaigi.

1. The Origamist’s Ruby
折り紙作家のルビー

2. @halogenandtoast
Matthew "Goose" Mongeau
https://github.com/halogenandtoast

3. @halogenandtoast
Matthew "Goose" Mongeau
https://github.com/halogenandtoast
グース

4. @halogenandtoast
Matthew "Goose" Mongeau
https://github.com/halogenandtoast

6. What is this talk
about?

7. "Not all code needs to
be a factory, some of it
can just be origami."
- _why

8. "A programmer who subconsciously
views himself as an artist will enjoy
what he does and will do it better."
- Donald Knuth

9. What is Origami?

10. The art of
folding paper.

11. Demonstration

13. O o
Imagination Required
ガオー

14. Origami is Art

15. Origami is Art
It’s beautiful.

16. Origami is Art
It’s beautiful.
It’s creative.

17. It’s beautiful.
It’s creative.
It’s expressive.
Origami is Art

18. What is
Programming?

19. The art of
writing code.

20. Code is Art

21. Code is Art
It’s beautiful.

22. Code is Art
It’s beautiful.
It’s creative.

23. Code is Art
It’s beautiful.
It’s creative.
It’s expressive.

24. How do you write
beautiful code?

25. Simplicity
単純

26. Code should be simple
to understand.

27. def play
puts "Welcome to the guessing game."
3.times do
guess = get_guess
if won? guess
@won = true
puts "You win!"
break
else
puts "Wrong!"
end
end
if !@won
puts "You lost.The actual number is #{@actual_number}."
end
end

28. def play
puts "Welcome to the guessing game."
3.times do
guess = get_guess
if won? guess
@won = true
puts "You win!"
break
else
puts "Wrong!"
end
end
if !@won
puts "You lost.The actual number is #{@actual_number}."
end
end

29. def play
print_header
play_rounds
print_results
end

30. def play
puts "Welcome to the guessing game."
play_rounds
print_results
end

31. def play
print_header
play_rounds
print_results
end

32. Complexity
複雑

33. How do you balance
simplicity and complexity?

34. def play_rounds
round_count.times do
if correct_guess? get_guess
@won = true
break
else
puts "Wrong!"
end
end
end

35. def play_rounds
@won = round_count.times.detect { play_round }
end
def play_round
if correct_guess? get_guess
true
else
puts "Wrong!"
end
end

36. Constraints
規制

37. Origami’s Constraints

38. Origami’s Constraints
Must use a single sheet of paper.

39. Origami’s Constraints
Must use a single sheet of paper.
Must be in the shape of a square.

40. Must use a single sheet of paper.
Must be in the shape of a square.
Must not cut the square.
Origami’s Constraints

41. Code Constraints

42. Code Constraints*
*Borrowed from Sandi Metz

43. Code Constraints*
*Borrowed from Sandi Metz
Methods can be no longer than 5 lines.

44. Code Constraints*
*Borrowed from Sandi Metz
Methods can be no longer than 5 lines.
Classes can be no longer than 100 lines.

45. Code Constraints*
*Borrowed from Sandi Metz
Methods can be no longer than 5 lines.
Classes can be no longer than 100 lines.
Methods cannot take more than 4 arguments.

46. def play
puts "Welcome to the guessing game."
3.times do
guess = get_guess
if won? guess
@won = true
puts "You win!"
break
else
puts "Wrong!"
end
end
if !@won
puts "You lost.The actual number is #{@actual_number}."
end
end

47. def play
print_header
play_rounds
print_results
end

48. def play_rounds
round_count.times do
if correct_guess? get_guess
@won = true
break
else
puts "Wrong!"
end
end
end

49. def play_rounds
@won = round_count.times.detect { play_round }
end
def play_round
if correct_guess? get_guess
true
else
puts "Wrong!"
end
end

50. http://www.flickr.com/photos/ardonik/3954691105/sizes/l/in/photostream/
Breaking the Rules
違反

51. "Learn the rules like a
pro, so you can break
them like an artist."
- Pablo Picasso

52. def play_round
if correct_guess? get_guess
true
else
puts "Wrong!"
end
end

53. def play_round
if correct_guess? get_guess
puts "Correct"
true
else
puts "Wrong!"
false
end
end

54. def play_round
if correct_guess? get_guess
correct_guess
else
incorrect_guess
end
end
def incorrect_guess
puts "Wrong!"
false
end
def correct_guess
puts "Correct"
false
end

55. class Guess
def initialize actual_number
@actual_number = actual_number
@guess = get_guess
end
def status
if correct?
"Correct"
else
"Incorrect"
end
end
def correct?
guess == actual_number
end
private
attr_reader :guess, :actual_number
def get_guess
print "What is your guess: "
gets.to_i
end
end

56. class Guess
def initialize actual_number
@actual_number = actual_number
@guess = get_guess
end
def status
if correct?
"Correct"
else
"Incorrect"
end
end
def correct?
guess == actual_number
end
private
attr_reader :guess, :actual_number
def get_guess
print "What is your guess: "
gets.to_i
end
end
def play_round
guess = Guess.new(actual_number)
puts guess.display_status
guess.correct?
end

57. How to be an artist

58. Be inspired by others

59. Surround yourself with
talented artists

60. Surround yourself with
talented artists

61. Use well known
techniques

62. Use well known
techniques

63. Measure improvement

66. Have feelings

67. Know when to break
the rules

68. Have fun.

69. RUBYKAIGI
$20 off first month
Prime
learn.thoughtbot.com/prime

70. Questions?