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Let's LL

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Let's programming lightweight language

Published in: Software
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Let's LL

  1. 1. Copyright © 2017 SG Corporation. All right reserved. Let’s LL 第二事業部 市岡岳彦 2017/2/3
  2. 2. Copyright © 2017 SG Corporation. All right reserved. 本資料の内容は(株)エス・ジー社員の 市岡岳彦の個人的見解であり、 (株)エス・ジーの公式見解ではありません。 2017/2/3 2
  3. 3. Copyright © 2017 SG Corporation. All right reserved. LL? 2017/2/3 3
  4. 4. Copyright © 2017 SG Corporation. All right reserved. Lightweight Language 2017/2/3 4
  5. 5. Copyright © 2017 SG Corporation. All right reserved. Lightweight 2017/2/3 5
  6. 6. Copyright © 2017 SG Corporation. All right reserved. Language 2017/2/3 6
  7. 7. Copyright © 2017 SG Corporation. All right reserved. スクリプト言語とか 2017/2/3 7
  8. 8. Copyright © 2017 SG Corporation. All right reserved. 動的型言語とか 言われてたもの 2017/2/3 8
  9. 9. Copyright © 2017 SG Corporation. All right reserved. PHP,JavaScript, Python,Ruby,… 2017/2/3 9
  10. 10. Copyright © 2017 SG Corporation. All right reserved. でも 2017/2/3 10
  11. 11. Copyright © 2017 SG Corporation. All right reserved. 巷間伝えるところ 2017/2/3 11
  12. 12. Copyright © 2017 SG Corporation. All right reserved. 変数に型がないと わかりにくいよ 2017/2/3 12
  13. 13. Copyright © 2017 SG Corporation. All right reserved. コンパイル時の 型安全性が確保できない 2017/2/3 13
  14. 14. Copyright © 2017 SG Corporation. All right reserved. 勝手に型が変換されて よくわからない 2017/2/3 14
  15. 15. Copyright © 2017 SG Corporation. All right reserved. とかね 2017/2/3 15
  16. 16. Copyright © 2017 SG Corporation. All right reserved. disってても 仕方がないので 2017/2/3 16
  17. 17. Copyright © 2017 SG Corporation. All right reserved. まずは静的型言語を 見てみよう 2017/2/3 17
  18. 18. Copyright © 2017 SG Corporation. All right reserved. printf(“%s:%dn”, “orange”, 5); 2017/2/3 18
  19. 19. Copyright © 2017 SG Corporation. All right reserved. これは変だ 2017/2/3 19
  20. 20. Copyright © 2017 SG Corporation. All right reserved. printf(“%s:%dn”, “orange”, 5); Cの可変長引数は型安全じゃない 2017/2/3 20
  21. 21. Copyright © 2017 SG Corporation. All right reserved. System.out.println(“orange:” + 5); 2017/2/3 21
  22. 22. Copyright © 2017 SG Corporation. All right reserved. これは変だ 2017/2/3 22
  23. 23. Copyright © 2017 SG Corporation. All right reserved. System.out.println(“orange:” + 5); Javaは演算子オーバーロードは ないはずなのに? 2017/2/3 23
  24. 24. Copyright © 2017 SG Corporation. All right reserved. もうちょっと 見てみよう 2017/2/3 24
  25. 25. Copyright © 2017 SG Corporation. All right reserved. Cでは… 0がfalseで 0以外はtrue 2017/2/3 25
  26. 26. Copyright © 2017 SG Corporation. All right reserved. Cでは… 文字列に’0’が 出現したら終端 2017/2/3 26
  27. 27. Copyright © 2017 SG Corporation. All right reserved. ですよねー 2017/2/3 27
  28. 28. Copyright © 2017 SG Corporation. All right reserved. 静的型言語も 2017/2/3 28
  29. 29. Copyright © 2017 SG Corporation. All right reserved. 変なルールが いっぱいあるよ 2017/2/3 29
  30. 30. Copyright © 2017 SG Corporation. All right reserved. お互い様だね 2017/2/3 30
  31. 31. Copyright © 2017 SG Corporation. All right reserved. それはそうと 2017/2/3 31
  32. 32. Copyright © 2017 SG Corporation. All right reserved. 人々は言う 2017/2/3 32
  33. 33. Copyright © 2017 SG Corporation. All right reserved. 型がない 2017/2/3 33
  34. 34. Copyright © 2017 SG Corporation. All right reserved. 正確に言うと 2017/2/3 34
  35. 35. Copyright © 2017 SG Corporation. All right reserved. 変数に型がない 2017/2/3 35
  36. 36. Copyright © 2017 SG Corporation. All right reserved. と言うか 2017/2/3 36
  37. 37. Copyright © 2017 SG Corporation. All right reserved. プログラミングスタイル の違いとして 2017/2/3 37
  38. 38. Copyright © 2017 SG Corporation. All right reserved. 型を変数の属性と みなすか 2017/2/3 38
  39. 39. Copyright © 2017 SG Corporation. All right reserved. 型を値の属性と みなすか 2017/2/3 39
  40. 40. Copyright © 2017 SG Corporation. All right reserved. 型がないわけじゃない 2017/2/3 40
  41. 41. Copyright © 2017 SG Corporation. All right reserved. えーと 2017/2/3 41
  42. 42. Copyright © 2017 SG Corporation. All right reserved. [Pythonの場合] x = 'banana' print type(x) # <type 'str'> x = 2357 print type(x) # <type 'int'> 2017/2/3 42
  43. 43. Copyright © 2017 SG Corporation. All right reserved. [PyObject構造体] typedef struct _object { PyObject_HEAD } PyObject; typedef struct { PyObject_HEAD long ob_ival; } PyIntObject; 2017/2/3 43
  44. 44. Copyright © 2017 SG Corporation. All right reserved. Pythonの内部構造::PyObject http://postd.cc/python- internals-pyobject/ 2017/2/3 44
  45. 45. Copyright © 2017 SG Corporation. All right reserved. これはそれほど 驚くことでもない 2017/2/3 45
  46. 46. Copyright © 2017 SG Corporation. All right reserved. JavaやC#プログラマだって 2017/2/3 46
  47. 47. Copyright © 2017 SG Corporation. All right reserved. 意識してることだよね 2017/2/3 47
  48. 48. Copyright © 2017 SG Corporation. All right reserved. してるよね 2017/2/3 48
  49. 49. Copyright © 2017 SG Corporation. All right reserved. しろよ 2017/2/3 49
  50. 50. Copyright © 2017 SG Corporation. All right reserved. Object型であれば なんだって入るからね 2017/2/3 50
  51. 51. Copyright © 2017 SG Corporation. All right reserved. [Javaの場合] Object obj = "grape"; System.out.println(obj.getClass()); // class java.lang.String obj = 1234; System.out.println(obj.getClass()); // class java.lang.Integer 2017/2/3 51
  52. 52. Copyright © 2017 SG Corporation. All right reserved. それを踏まえて 2017/2/3 52
  53. 53. Copyright © 2017 SG Corporation. All right reserved. [Pythonの場合] a = ‘banana' # <type 'str'> b = 2357 # <type 'int'> 2017/2/3 53
  54. 54. Copyright © 2017 SG Corporation. All right reserved. 変数宣言と同時に 代入によって 2017/2/3 54
  55. 55. Copyright © 2017 SG Corporation. All right reserved. 暗黙の型宣言がなされて いるようなもの 2017/2/3 55
  56. 56. Copyright © 2017 SG Corporation. All right reserved. [Pythonの場合] str a = ‘banana' int b = 2357 2017/2/3 56
  57. 57. Copyright © 2017 SG Corporation. All right reserved. LLプログラマには コードがこう見えてる 2017/2/3 57
  58. 58. Copyright © 2017 SG Corporation. All right reserved. ところで 2017/2/3 58
  59. 59. Copyright © 2017 SG Corporation. All right reserved. コンパイル時の 型安全性が確保できない 2017/2/3 59
  60. 60. Copyright © 2017 SG Corporation. All right reserved. って、言ってたよね 2017/2/3 60
  61. 61. Copyright © 2017 SG Corporation. All right reserved. いつ 型チェックをするか? 2017/2/3 61
  62. 62. Copyright © 2017 SG Corporation. All right reserved. 「実行時」です 2017/2/3 62
  63. 63. Copyright © 2017 SG Corporation. All right reserved. 彼らはなぜ 2017/2/3 63
  64. 64. Copyright © 2017 SG Corporation. All right reserved. それで問題ないと 主張するのか? 2017/2/3 64
  65. 65. Copyright © 2017 SG Corporation. All right reserved. 「テストファースト」 2017/2/3 65
  66. 66. Copyright © 2017 SG Corporation. All right reserved. ここ重要 2017/2/3 66
  67. 67. Copyright © 2017 SG Corporation. All right reserved. ユニットテストの テストケースがない コードは 2017/2/3 67
  68. 68. Copyright © 2017 SG Corporation. All right reserved. 信用できない 2017/2/3 68
  69. 69. Copyright © 2017 SG Corporation. All right reserved. ユニットテストは 2017/2/3 69
  70. 70. Copyright © 2017 SG Corporation. All right reserved. コンパイラの 検証より有用 2017/2/3 70
  71. 71. Copyright © 2017 SG Corporation. All right reserved. 強力な柔軟性を 手に入れつつ 2017/2/3 71
  72. 72. Copyright © 2017 SG Corporation. All right reserved. プログラムの動作を 担保する 2017/2/3 72
  73. 73. Copyright © 2017 SG Corporation. All right reserved. じゃあ 2017/2/3 73
  74. 74. Copyright © 2017 SG Corporation. All right reserved. 柔軟性って? 2017/2/3 74
  75. 75. Copyright © 2017 SG Corporation. All right reserved. 「ダックタイピング」 2017/2/3 75
  76. 76. Copyright © 2017 SG Corporation. All right reserved. class Duck: def sound(self): return 'quack' def test(foo): print foo.sound() test(Duck()) # quack 2017/2/3 76
  77. 77. Copyright © 2017 SG Corporation. All right reserved. インターフェースと なにが違うの? 2017/2/3 77
  78. 78. Copyright © 2017 SG Corporation. All right reserved. インターフェースは 一度決めると 後から変えるのが大変 2017/2/3 78
  79. 79. Copyright © 2017 SG Corporation. All right reserved. はじめに全てが分かって いるわけではない 2017/2/3 79
  80. 80. Copyright © 2017 SG Corporation. All right reserved. 継承関係は必要ない 2017/2/3 80
  81. 81. Copyright © 2017 SG Corporation. All right reserved. 型宣言による 強制ではなく 2017/2/3 81
  82. 82. Copyright © 2017 SG Corporation. All right reserved. コメントとユニットテスト によるドキュメント化 2017/2/3 82
  83. 83. Copyright © 2017 SG Corporation. All right reserved. より柔軟な クラス間の協調 2017/2/3 83
  84. 84. Copyright © 2017 SG Corporation. All right reserved. … 2017/2/3 84
  85. 85. Copyright © 2017 SG Corporation. All right reserved. とはいえ 2017/2/3 85
  86. 86. Copyright © 2017 SG Corporation. All right reserved. 最近の傾向は 2017/2/3 86
  87. 87. Copyright © 2017 SG Corporation. All right reserved. 両者いいとこ取り 2017/2/3 87
  88. 88. Copyright © 2017 SG Corporation. All right reserved. 「タイプヒンティング」 2017/2/3 88
  89. 89. Copyright © 2017 SG Corporation. All right reserved. PHP 2017/2/3 89
  90. 90. Copyright © 2017 SG Corporation. All right reserved. PHP7から タイプヒンティング ではなく 2017/2/3 90
  91. 91. Copyright © 2017 SG Corporation. All right reserved. 型宣言という ふつうの用語になって しまいましたが 2017/2/3 91
  92. 92. Copyright © 2017 SG Corporation. All right reserved. 型宣言なし 2017/2/3 92
  93. 93. Copyright © 2017 SG Corporation. All right reserved. function sum($a, $b) { return $a + $b; } sum(1.5, 2.5); # 4 2017/2/3 93
  94. 94. Copyright © 2017 SG Corporation. All right reserved. 弱い型チェック 2017/2/3 94
  95. 95. Copyright © 2017 SG Corporation. All right reserved. function sum(int $a, int $b) { return $a + $b; } sum(1.5, 2.5); # 3 2017/2/3 95
  96. 96. Copyright © 2017 SG Corporation. All right reserved. 強い型チェック 2017/2/3 96
  97. 97. Copyright © 2017 SG Corporation. All right reserved. declare(strict_types=1); function sum(int $a, int $b) { return $a + $b; } sum(1.5, 2.5); # 実行時エラー 2017/2/3 97
  98. 98. Copyright © 2017 SG Corporation. All right reserved. 型チェックの強度を 選ぶことができる 2017/2/3 98
  99. 99. Copyright © 2017 SG Corporation. All right reserved. コメントによる型宣言 2017/2/3 99
  100. 100. Copyright © 2017 SG Corporation. All right reserved. 「Closure Compiler」 https://developers.google.com/closure/comp iler/ 2017/2/3 100
  101. 101. Copyright © 2017 SG Corporation. All right reserved. JavaScript 2017/2/3 101
  102. 102. Copyright © 2017 SG Corporation. All right reserved. function sum(a, b) { return a + b; } 2017/2/3 102
  103. 103. Copyright © 2017 SG Corporation. All right reserved. JSDocの アノテーションで 2017/2/3 103
  104. 104. Copyright © 2017 SG Corporation. All right reserved. /** * @param {number} a * @param {number} b * @return {number} */ function sum(a, b) { return a + b; } 2017/2/3 104
  105. 105. Copyright © 2017 SG Corporation. All right reserved. とか 2017/2/3 105
  106. 106. Copyright © 2017 SG Corporation. All right reserved. function /** number */ sum( /** number */ a, /** number */ b) { return a + b; } 2017/2/3 106
  107. 107. Copyright © 2017 SG Corporation. All right reserved. とか書ける 2017/2/3 107
  108. 108. Copyright © 2017 SG Corporation. All right reserved. 言語仕様の外側に 型チェックを設ける 2017/2/3 108
  109. 109. Copyright © 2017 SG Corporation. All right reserved. 型推論 2017/2/3 109
  110. 110. Copyright © 2017 SG Corporation. All right reserved. C# 2017/2/3 110
  111. 111. Copyright © 2017 SG Corporation. All right reserved. Dictionary<string, string> dict = new Dictionary<string, string>() { { "banana", "yellow" }, { "apple", "red" }, { "orange", "orange" } }; foreach (KeyValuePair<string, string> elem in dict) { Console.WriteLine(elem.Key + ":" + elem.Value); } 2017/2/3 111
  112. 112. Copyright © 2017 SG Corporation. All right reserved. dictとelemの型は 文脈から推論できる 2017/2/3 112
  113. 113. Copyright © 2017 SG Corporation. All right reserved. [dict] Dictionary<string, string> コンストラクタが返す型 2017/2/3 113
  114. 114. Copyright © 2017 SG Corporation. All right reserved. var dict = new Dictionary<string, string>() { { "banana", "yellow" }, { "apple", "red" }, { "orange", "orange" } }; foreach (KeyValuePair<string, string> elem in dict) { Console.WriteLine(elem.Key + ":" + elem.Value); } 2017/2/3 114
  115. 115. Copyright © 2017 SG Corporation. All right reserved. [elem] dictからforeachで取り出されて Key,Valueプロパティを 持っているような型 2017/2/3 115
  116. 116. Copyright © 2017 SG Corporation. All right reserved. var dict = new Dictionary<string, string>() { { "banana", "yellow" }, { "apple", "red" }, { "orange", "orange" } }; foreach (var elem in dict) { Console.WriteLine(elem.Key + ":" + elem.Value); } 2017/2/3 116
  117. 117. Copyright © 2017 SG Corporation. All right reserved. 間違ってると 2017/2/3 117
  118. 118. Copyright © 2017 SG Corporation. All right reserved. 実行時ではなく 2017/2/3 118
  119. 119. Copyright © 2017 SG Corporation. All right reserved. コンパイル時に エラーになるよ 2017/2/3 119
  120. 120. Copyright © 2017 SG Corporation. All right reserved. じゃあ、まとめ 2017/2/3 120
  121. 121. Copyright © 2017 SG Corporation. All right reserved. 型の強制をプログラマが 制御できることにより 2017/2/3 121
  122. 122. Copyright © 2017 SG Corporation. All right reserved. 選択の幅が広がる 2017/2/3 122
  123. 123. Copyright © 2017 SG Corporation. All right reserved. APIの インターフェースは 型宣言 2017/2/3 123
  124. 124. Copyright © 2017 SG Corporation. All right reserved. ローカル変数の 型宣言はてきとうに 2017/2/3 124
  125. 125. Copyright © 2017 SG Corporation. All right reserved. とかね 2017/2/3 125
  126. 126. Copyright © 2017 SG Corporation. All right reserved. 参考文献 オブジェクト指向設計実践ガイド ~Rubyでわかる 進化しつづける柔軟なアプリケーションの育て方 Sandi Metz 著,髙山泰基 訳 技術評論社 2017/2/3 126
  127. 127. Copyright © 2017 SG Corporation. All right reserved. (株)エス・ジー http://www.sgnet.co.jp ブログ http://blog.sgnet.co.jp 2017/2/3 127

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