Ruby on

Apr 25, 2012Download as KEY, PDF1 like604 views

Jun Yokoyama

自己紹介

フリーエンジニア

twitter:@nysalor
blog: http://blog.larus.jp/
好きなメソッドはArrayEnumerable#map

配列の例

[1, 2, 3, 4, 5]
[:alpha, :bravo, :charlie]
[1, ‘second’, :third, [4.1, 4.2, 4.3], { :?fth => ‘element’}]

配列の作り方

中身の入った配列

a = [1, 3, 5, 7]
a = Array.new(3, 5) #=> [5, 5, 5]

配列の作り方

文字列から作成

a = %w(tinker tailor soldier spy)
a = “battle ship:light cruiser:destroyer”.split(“:”)

$配列の作り方 to_aメソッド a = (1..3).to_a a = (“a”..”z”).to_a a = {“alpha” => “A”, “bravo” => “B”}.to_a$

$配列の作り方 to_aメソッド範囲演算子 a = (1..3).to_a a = (“a”..”z”).to_a a = {“alpha” => “A”, “bravo” => “B”}.to_a$

要素の取り出し

a = ["alpha", "bravo", "charlie"]

要素の取り出し

a = ["alpha", "bravo", "charlie"]

a[2] #=> “charlie”
a[0, 3] #=> “alpha”, “bravo”, “charlie”

要素の取り出し

a = ["alpha", "bravo", "charlie"]

a.?rst #=> “alpha”
a.last #=> “charlie”
a.shift #=> “alpha”
a.pop #=> “charlie”

要素の取り出し

a = ["alpha", "bravo", "charlie"]

a.?rst #=> “alpha”
a.last #=> “charlie”
a.shift #=> “alpha” 要素が削除される

a.pop #=> “charlie”

要素の取り出し

a = ["alpha", "bravo", "charlie"]

a.?rst #=> “alpha”
a.last #=> “charlie”
a.shift #=> “alpha” 要素が削除される

a.pop #=> “charlie” 要素が削除される

要素の追加

a = ["alpha", "bravo", "charlie"]

要素の追加

a = ["alpha", "bravo", "charlie"]

a << “delta”
a.push(“delta”)
a.unshift(“zulu”)

配列の演算

a = ["alpha", "bravo", "charlie"]
b = ["charlie", "delta", "echo"]

配列の演算

a = ["alpha", "bravo", "charlie"]
b = ["charlie", "delta", "echo"]

a+b
a-b
a*3

配列の演算

a = ["alpha", "bravo", "charlie"]
b = ["charlie", "delta", "echo"]

a & b #=> [“charlie”]
a|b
a == b #=> false

配列の操作

a = ["alpha", "bravo", "charlie"]

配列の操作

a = ["alpha", "bravo", "charlie"]

a.reverse
a.shuf?e

配列の操作

a = ["alpha", "bravo", "charlie"]
b = ["delta", "echo", "foxtrot"]
c = [b, a]

配列の操作

a = ["alpha", "bravo", "charlie"]
b = ["delta", "echo", "foxtrot"]
c = [b, a]

c.?atten
c.?atten.sort

配列の操作

a = ["golf", nil, nil]
b = ["hotel", "hotel", "india"]

配列の操作

a = ["golf", nil, nil]
b = ["hotel", "hotel", "india"]

a.compact
b.uniq

破壊的メソッド

a = ["alpha", "bravo", "charlie"]
b = ["charlie", "delta", "echo"]
c = [b, a]
d = c.flatten

破壊的メソッド

a = ["alpha", "bravo", "charlie"]
b = ["charlie", "delta", "echo"]
c = [b, a]
d a.reverse
= c.flatten

a.reverse!
a.shuf?e!
c.?atten!
d.sort!

破壊的メソッド

e = ["golf", nil, nil]
f = ["hotel", "hotel", "india"]

破壊的メソッド

e = ["golf", nil, nil]
f = ["hotel", "hotel", "india"]

a.compact!
b.uniq!

破壊的メソッド

a = ["alpha", "bravo", "charlie"]

破壊的メソッド

a = ["alpha", "bravo", "charlie"]

a.shift
a.pop
a.unshift(“zulu”)
a.push(“golf”)
a.clear

破壊的メソッド

a = ["alpha", "bravo", "charlie"]

a.shift
a.pop
a.unshift(“zulu”) これらは!がなくても破壊的

a.push(“golf”)
a.clear

文字列化

a = ["alpha", "bravo", "charlie"]
b = ["charlie", "delta", "echo"]

文字列化

a = ["alpha", "bravo", "charlie"]
b = ["charlie", "delta", "echo"]

a.join #=> “alphabravocharlie”
a.join(“/”) #=> “alpha/bravo/charlie”

配列の评価

a = ["alpha", "bravo", "charlie"]

配列の评価

a = ["alpha", "bravo", "charlie"]

a.include?(“bravo”) #=> true
a.all? #=> true

配列の评価

a = ["alpha", "bravo", "charlie"]

a.size #=> 3
a.count #=> 3
a.length #=> 3

配列の评価

g = ["juliet", nil, nil]
h = [nil, nil, nil]

配列の评価

g = ["juliet", nil, nil]
h = [nil, nil, nil]

g.all? #=> false
g.any? #=> true
h.any? #=> false

配列の検索

a = ["alpha", "bravo", "charlie"]

配列の検索

a = ["alpha", "bravo", "charlie"]

a.?nd(/l/).?rst
a.grep(/a/)

イテレーション
a = ["alpha", "bravo", "charlie"]

a.each do |x|
p x
end

イテレーション
a = ["alpha", "bravo", "charlie"]

a.each do |x| ブロック変数
p x
end

イテレーション

a = ["alpha", "bravo", "charlie"]

a.each_with_index do |x, idx|
p x
p idx
end

イテレーション
a = ["alpha", "bravo", "charlie"]

a.inject(0) do |result, x|
result + x.size
end

イテレーション
a = ["alpha", "bravo", "charlie"]
初期値
a.inject(0) do |result, x|
result + x.size
end

イテレーション
a = ["alpha", "bravo", "charlie"]

a.map do |x|
x.reverse
end

イテレーション
a = ["alpha", "bravo", "charlie"]

a.map! do |x| 破壊的メソッド
x.reverse
end

质疑応答

if available?
??Question.all.map(&:answer!)
end

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Ruby on

1. Ruby on Arrays 2012/4/25 yoyogi.rb

2. 搁耻产测の配列について

3. 自己紹介フリーエンジニア twitter:@nysalor blog: http://blog.larus.jp/ 好きなメソッドはArrayEnumerable#map

4. 配列？ Arrayクラスで定義 []でくくる要素は何でもいい

5. 配列の例 [1, 2, 3, 4, 5] [:alpha, :bravo, :charlie] [1, ‘second’, :third, [4.1, 4.2, 4.3], { :?fth => ‘element’}]

6. 配列の作り方

7. 配列の作り方空の配列

8. 配列の作り方空の配列 a = [] a = Array.new

9. 配列の作り方

10. 配列の作り方中身の入った配列

11. 配列の作り方中身の入った配列 a = [1, 3, 5, 7] a = Array.new(3, 5) #=> [5, 5, 5]

12. 配列の作り方

13. 配列の作り方文字列から作成

14. 配列の作り方文字列から作成 a = %w(tinker tailor soldier spy) a = “battle ship:light cruiser:destroyer”.split(“:”)

15. 配列の作り方

16. 配列の作り方 to_aメソッド

17. 配列の作り方 to_aメソッド a = (1..3).to_a a = (“a”..”z”).to_a a = {“alpha” => “A”, “bravo” => “B”}.to_a

18. 配列の作り方 to_aメソッド範囲演算子 a = (1..3).to_a a = (“a”..”z”).to_a a = {“alpha” => “A”, “bravo” => “B”}.to_a

19. 要素の取り出し

20. 要素の取り出し a = ["alpha", "bravo", "charlie"]

21. 要素の取り出し a = ["alpha", "bravo", "charlie"] a[2] #=> “charlie” a[0, 3] #=> “alpha”, “bravo”, “charlie”

22. 要素の取り出し

23. 要素の取り出し a = ["alpha", "bravo", "charlie"]

24. 要素の取り出し a = ["alpha", "bravo", "charlie"] a.?rst #=> “alpha” a.last #=> “charlie” a.shift #=> “alpha” a.pop #=> “charlie”

25. 要素の取り出し a = ["alpha", "bravo", "charlie"] a.?rst #=> “alpha” a.last #=> “charlie” a.shift #=> “alpha” 要素が削除される a.pop #=> “charlie”

26. 要素の取り出し a = ["alpha", "bravo", "charlie"] a.?rst #=> “alpha” a.last #=> “charlie” a.shift #=> “alpha” 要素が削除される a.pop #=> “charlie” 要素が削除される

27. 要素の追加

28. 要素の追加 a = ["alpha", "bravo", "charlie"]

29. 要素の追加 a = ["alpha", "bravo", "charlie"] a << “delta” a.push(“delta”) a.unshift(“zulu”)

30. 配列の演算

31. 配列の演算 a = ["alpha", "bravo", "charlie"] b = ["charlie", "delta", "echo"]

32. 配列の演算 a = ["alpha", "bravo", "charlie"] b = ["charlie", "delta", "echo"] a+b a-b a*3

33. 配列の演算

34. 配列の演算 a = ["alpha", "bravo", "charlie"] b = ["charlie", "delta", "echo"]

35. 配列の演算 a = ["alpha", "bravo", "charlie"] b = ["charlie", "delta", "echo"] a & b #=> [“charlie”] a|b a == b #=> false

36. 配列の操作

37. 配列の操作 a = ["alpha", "bravo", "charlie"]

38. 配列の操作 a = ["alpha", "bravo", "charlie"] a.reverse a.shuf?e

39. 配列の操作

40. 配列の操作 a = ["alpha", "bravo", "charlie"] b = ["delta", "echo", "foxtrot"] c = [b, a]

41. 配列の操作 a = ["alpha", "bravo", "charlie"] b = ["delta", "echo", "foxtrot"] c = [b, a] c.?atten c.?atten.sort

42. 配列の操作

43. 配列の操作 a = ["golf", nil, nil] b = ["hotel", "hotel", "india"]

44. 配列の操作 a = ["golf", nil, nil] b = ["hotel", "hotel", "india"] a.compact b.uniq

45. 破壊的メソッド

46. 破壊的メソッド a = ["alpha", "bravo", "charlie"] b = ["charlie", "delta", "echo"] c = [b, a] d = c.flatten

47. 破壊的メソッド a = ["alpha", "bravo", "charlie"] b = ["charlie", "delta", "echo"] c = [b, a] d a.reverse = c.flatten a.reverse! a.shuf?e! c.?atten! d.sort!

48. 破壊的メソッド

49. 破壊的メソッド e = ["golf", nil, nil] f = ["hotel", "hotel", "india"]

50. 破壊的メソッド e = ["golf", nil, nil] f = ["hotel", "hotel", "india"] a.compact! b.uniq!

51. 破壊的メソッド

52. 破壊的メソッド a = ["alpha", "bravo", "charlie"]

53. 破壊的メソッド a = ["alpha", "bravo", "charlie"] a.shift a.pop a.unshift(“zulu”) a.push(“golf”) a.clear

54. 破壊的メソッド a = ["alpha", "bravo", "charlie"] a.shift a.pop a.unshift(“zulu”) これらは!がなくても破壊的 a.push(“golf”) a.clear

55. 文字列化

56. 文字列化 a = ["alpha", "bravo", "charlie"] b = ["charlie", "delta", "echo"]

57. 文字列化 a = ["alpha", "bravo", "charlie"] b = ["charlie", "delta", "echo"] a.join #=> “alphabravocharlie” a.join(“/”) #=> “alpha/bravo/charlie”

58. 配列の评価

59. 配列の评価 a = ["alpha", "bravo", "charlie"]

60. 配列の评価 a = ["alpha", "bravo", "charlie"] a.include?(“bravo”) #=> true a.all? #=> true

61. 配列の评価

62. 配列の评価 a = ["alpha", "bravo", "charlie"]

63. 配列の评価 a = ["alpha", "bravo", "charlie"] a.size #=> 3 a.count #=> 3 a.length #=> 3

64. 配列の评価

65. 配列の评価 g = ["juliet", nil, nil] h = [nil, nil, nil]

66. 配列の评価 g = ["juliet", nil, nil] h = [nil, nil, nil] g.all? #=> false g.any? #=> true h.any? #=> false

67. 配列の検索

68. 配列の検索 a = ["alpha", "bravo", "charlie"]

69. 配列の検索 a = ["alpha", "bravo", "charlie"] a.?nd(/l/).?rst a.grep(/a/)

70. イテレーション

71. イテレーション a = ["alpha", "bravo", "charlie"] a.each do |x| p x end

72. イテレーション a = ["alpha", "bravo", "charlie"] a.each do |x| ブロック変数 p x end

73. イテレーション

74. イテレーション a = ["alpha", "bravo", "charlie"] a.each_with_index do |x, idx| p x p idx end

75. イテレーション

76. イテレーション a = ["alpha", "bravo", "charlie"] a.inject(0) do |result, x| result + x.size end

77. イテレーション a = ["alpha", "bravo", "charlie"] 初期値 a.inject(0) do |result, x| result + x.size end

78. イテレーション

79. イテレーション a = ["alpha", "bravo", "charlie"] a.map do |x| x.reverse end

80. イテレーション

81. イテレーション a = ["alpha", "bravo", "charlie"] a.map! do |x| x.reverse end

82. イテレーション a = ["alpha", "bravo", "charlie"] a.map! do |x| 破壊的メソッド x.reverse end

83. まとめ配列は奥が深い破壊的メソッドに注意イテレーション

84. 质疑応答

85. 质疑応答 if available? ??Question.all.map(&:answer!) end

86. ご清聴ありがとうございました

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