Kolin Modifiers

「KotlinのLT会！Kotlin入門者の集い」で発表したやつの全部込み版です。

Transcript

1. Kolin Modifiers ,PUMJOͷ-5ձʂ,PUMJOೖ໳ऀͷू͍
   
2. Name: Company: Role: Language: Kotlin: ͖ͩ͠ ServerSideEngineer, BridgeEngineer Java 1.0͘Β͍͔Β
5. ,PUMJOʹ͸ؔ਺ʹ͚ͭΔ͜ͱ͕Ͱ͖Δ
   .PEJpFS म০ࢠ ͕͍Ζ͍Ζ͋Δ
6. ‣ infix ‣ inline ‣ noinline ‣ crossinline ‣ reified ‣ tailrec
7. ͜ΕΒΛઆ໌͠·͢
8. 7JTJCJMJUZ
   .PEJpFST͸άά͍ͬͯͩ͘͞
9. infix
10. Ҿ਺͕ͭͷϝιουΛ
    ׅހͳ͠Ͱ࢖͑ΔΑ͏ʹ͢Δ
12. infix Modifier
13. StringΫϥεͷ֦ுؔ਺
14. Ҿ਺͸Ұͭ
15. ͜Μͳ෩ʹ࢖͑Δ
16. w ϝϯόؔ਺·ͨ͸֦ுؔ਺
    w Ҿ਺͕ͭ
    w infixΛؔ਺ʹ͚ͭΔ ࢖༻৚݅
17. ΋ͪΖΜͭͳ͛ͯ΋࢖͑Δ
18. ͜ΕΛ
19. ͜͏ͯ͠
20. ͜ΕΛ
21. ͜͏͢Δ
22. ͪͳΈʹ
23. ͜Ε͸ͩΊ
24. ͜Ε͸0,
25. inline
26. 'VODUJPO
    MJUFSBMΛΠϯϥΠϯల։͢Δ͜ͱͰ
    ࣮ߦ࣌ͷΦʔόʔϔουΛݮΒ͠
    ύϑΥʔϚϯεΛ޲্ͤ͞Δ
28. 'VODUJPO
    MJUFSBMΛΠϯϥΠϯల։͢Δ͜ͱͰ
    ࣮ߦ࣌ͷΦʔόʔϔουΛݮΒ͠
    ύϑΥʔϚϯεΛ޲্ͤ͞Δ
29. 'VODUJPO
    MJUFSBMΛΠϯϥΠϯల։͢Δ͜ͱͰ
    ࣮ߦ࣌ͷΦʔόʔϔουΛݮΒ͠
    ύϑΥʔϚϯεΛ޲্ͤ͞Δ
30. 'VODUJPO
    MJUFSBMͱ͸ʁ
32. ແ໊ؔ਺΍
33. ϥϜμࣜͰ౉͞ΕΔ ؔ਺ͷ͜ͱ
34. ΠϯϥΠϯల։ͱ͸ʁ
35. ؆୯ͳൺֱͰઆ໌
37. StringΫϥεͷ֦ுؔ਺
38. StringΛҾ਺ʹͱͬͯStringΛฦؔ͢਺
39. Ҿ਺ͷؔ਺Λ࣮ߦͯ͠ɺtoUpperCase()ͯ͠ฦ͢
40. inline Modifier
41. ͦΕҎ֎͸Ұॹ
43. ݁Ռ͸ಉ͡
    
45. ͦΕͧΕ࣮ߦ࣌ʹͲ͏ͳΔͷ͔ʁ
46. inlineແ͠ /* ཧղ͠΍͍͢Α͏ʹKotlinͰ؆ུԽͯ͠આ໌͠·͢ */
47. inlineແ͠ /* ཧղ͠΍͍͢Α͏ʹKotlinͰ؆ུԽͯ͠هड़͍ͯ͠·͢ */
48. SFDFJWFSͷ஋Λ֨ೲ inlineແ͠ /* ཧղ͠΍͍͢Α͏ʹKotlinͰ؆ུԽͯ͠هड़͍ͯ͠·͢ */
49. ֦ுؔ਺ͱಉ໊͡લͷؔ਺͕࡞੒͞Εݺ͹ΕΔ inlineແ͠ /* ཧղ͠΍͍͢Α͏ʹKotlinͰ؆ུԽͯ͠هड़͍ͯ͠·͢ */
50. ୈҰҾ਺ʹSFDFJWFS inlineແ͠ /* ཧղ͠΍͍͢Α͏ʹKotlinͰ؆ུԽͯ͠هड़͍ͯ͠·͢ */
51. ؔ਺ΦϒδΣΫτͷΠϯελϯεΛ࡞੒ׂͯ͠Γ౰ͯ inlineແ͠ /* ཧղ͠΍͍͢Α͏ʹKotlinͰ؆ུԽͯ͠هड़͍ͯ͠·͢ */
52. /* આ໌ͷͨΊʹ؆ུతʹهड़ͨ͠ΫϥεͰ͢ */ inlineແ͠
53. JOWPLFͱ͍͏ϝιουΛ΋ͭ /* આ໌ͷͨΊʹ؆ུతʹهड़ͨ͠ΫϥεͰ͢ */ inlineແ͠
54. த਎͸ϥϜμࣜͰ౉ͨ͠ॲཧ /* આ໌ͷͨΊʹ؆ུతʹهड़ͨ͠ΫϥεͰ͢ */ inlineແ͠
55. /* આ໌ͷͨΊʹ؆ུతʹهड़ͨؔ͠਺Ͱ͢ */ inlineແ͠
56. ϥϜμࣜͰ౉ͨ͠ॲཧΛ΋ͭΠϯελϯε /* આ໌ͷͨΊʹ؆ུతʹهड़ͨؔ͠਺Ͱ͢ */ inlineແ͠
57. ϥϜμࣜͰ౉ͨ͠ॲཧΛ࣮ߦ /* આ໌ͷͨΊʹ؆ུతʹهड़ͨؔ͠਺Ͱ͢ */ inlineແ͠
58. toUpperCase()Λͯ͠ฦ͢ /* આ໌ͷͨΊʹ؆ུతʹهड़ͨؔ͠਺Ͱ͢ */ inlineແ͠
59. inlineແ͠ /* ཧղ͠΍͍͢Α͏ʹKotlinͰ؆ུԽͯ͠هड़͍ͯ͠·͢ */
60. ϝιουݺͼग़͠ͷίετ inlineແ͠ /* ཧղ͠΍͍͢Α͏ʹKotlinͰ؆ུԽͯ͠هड़͍ͯ͠·͢ */
61. Πϯελϯεੜ੒ͷίετ inlineແ͠ /* ཧղ͠΍͍͢Α͏ʹKotlinͰ؆ུԽͯ͠هड़͍ͯ͠·͢ */
63. /* ཧղ͠΍͍͢Α͏ʹKotlinͰ؆ུԽͯ͠આ໌͠·͢ */ inline͋Γ
64. inline͋Γ /* ཧղ͠΍͍͢Α͏ʹKotlinͰ؆ུԽͯ͠هड़͍ͯ͠·͢ */
65. ಉ͡ inline͋Γ /* ཧղ͠΍͍͢Α͏ʹKotlinͰ؆ུԽͯ͠هड़͍ͯ͠·͢ */
66. ϥϜμࣜͰ౉ͨ͠ॲཧ inline͋Γ /* ཧղ͠΍͍͢Α͏ʹKotlinͰ؆ུԽͯ͠هड़͍ͯ͠·͢ */
67. toUpperCase()ͯ͠ऴΘΓ inline͋Γ /* ཧղ͠΍͍͢Α͏ʹKotlinͰ؆ུԽͯ͠هड़͍ͯ͠·͢ */
68. ΠϯϥΠϯల։ inline͋Γ /* ཧղ͠΍͍͢Α͏ʹKotlinͰ؆ུԽͯ͠هड़͍ͯ͠·͢ */
69. 'VODUJPO
    MJUFSBMΛΠϯϥΠϯల։͢Δ͜ͱͰ
    ࣮ߦ࣌ͷΦʔόʔϔουΛݮΒ͠
    ύϑΥʔϚϯεΛ޲্ͤ͞Δ
70. Πϯελϯεͷੜ੒ίετ
    ϝιουݺͼग़͠ͷίετ
71. Πϯελϯεͷੜ੒ίετ
    ϝιουݺͼग़͠ͷίετ
73. ؔ࿈͢Δಛ௃
74. ϥϜμࣜͷதͰreturnΛ࢖ͬͯ
    ݺͼग़͠ݩͷؔ਺Λൈ͚Δ͜ͱ͕Ͱ͖Δ
75. inlineͳ͠
77. ίϯύΠϧΤϥʔ
78. ͜ͷதͰݺͼग़͠ݩͷؔ਺͔Βൈ͚Α͏ͱ͢Δ
79. inline͋Γ
81. σϑΥϧτͰinlineʹͳΒͳ͍ͷ͸ͳͥʜ
82. ΠϯϥΠϯԽ͢Δؔ਺͕େ͖͍ͱ
    ੜ੒͞ΕΔίʔυ͕ංେԽ͢ΔՄೳੑ͕͋Δ
83. ϥϜμࣜ಺Ͱͷreturn͕ޡղΛট͖΍͍͢ /* ͜Ε͸ओ؍Ͱ͢ */
84. noinline
85. ΠϯϥΠϯԽ͠ͳ͍ؔ਺ΛࢦఆͰ͖Δ
87. noinline Modifier
88. ͜ͷؔ਺͸ΠϯϥΠϯల։͞Εͳ͍
89. ͬͪ͜ͷؔ਺͸ΠϯϥΠϯల։͞ΕΔ
90. crossinline
91. Ҿ਺ͷؔ਺Λinlineؔ਺಺Ҏ֎ͷจ຺Ͱ
    ࣮ߦͰ͖ΔΑ͏ʹ͢Δ
94. ౉͞Εͨؔ਺Λ
95. Invokableܕͷಗ໊Ϋϥεͷ
96. injectedFunction()ͱ͍͏ϝιουͷ࣮૷ʹ࢖͍͍ͨ
97. abstract class Invokable { fun invoke(arg: String): String { val before = doSomethingBefore(arg) val injected = injectedFunction(before) return doSomethingAfter(injected) } abstract fun injectedFunction(arg: String): String fun doSomethingBefore(arg: String) = "before$arg" fun doSomethingAfter(arg: String) = "${arg}after" }
98. abstract class Invokable { fun invoke(arg: String): String { val before = doSomethingBefore(arg) val injected = injectedFunction(before) return doSomethingAfter(injected) } abstract fun injectedFunction(arg: String): String fun doSomethingBefore(arg: String) = "before$arg" fun doSomethingAfter(arg: String) = "${arg}after" } injectedFunction()ͱ͍͏abstractϝιου
99. abstract class Invokable { fun invoke(arg: String): String { val before = doSomethingBefore(arg) val injected = injectedFunction(before) return doSomethingAfter(injected) } abstract fun injectedFunction(arg: String): String fun doSomethingBefore(arg: String) = "before$arg" fun doSomethingAfter(arg: String) = "${arg}after" } invoke()ͱ͍͏ϝιουͷதͰ
100. abstract class Invokable { fun invoke(arg: String): String { val before = doSomethingBefore(arg) val injected = injectedFunction(before) return doSomethingAfter(injected) } abstract fun injectedFunction(arg: String): String fun doSomethingBefore(arg: String) = "before$arg" fun doSomethingAfter(arg: String) = "${arg}after" } ࢖͏
101. ίϯύΠϧΤϥʔ
104. crossinline Modifier
105. ࢖͑Δ
106. reified
107. inlineؔ਺಺Ͱ
     ܕύϥϝʔλʹΞΫηεՄೳʹ͢Δ
108. ܕύϥϝʔλ
109. ClassΫϥεΛҾ਺ʹऔΔ
110. ಉ͡ܕͷListΛฦ͢
111. ౉͞ΕͨํʹΑͬͯॲཧΛ෼͚Δ
115. inline Modifier
116. reified Modifier
117. Ҿ਺͸ແ͠
118. ܕύϥϝʔλ͕ར༻Ͱ͖Δ
120. ܕΛએݴ͢Δ
121. Ҿ਺ͳ͠Ͱ࣮ߦ
122. ܕΛਪ࿦͢Δ
123. ܕΛࢦఆ࣮ͯ͠ߦ
126. ActivityΫϥεͷ֦ுؔ਺
127. reifiedΛ͚ͭͯΞΫηεՄೳʹ
128. Activity.findViewById()ͷ໭Γ஋Λ
129. ܕύϥϝʔλͰࢦఆ͞ΕΔܕʹΩϟετͯ͠ฦ͢
130. ܕએݴΛ͢Δ
131. ຖճΩϟετΛॻ͘ඞཁ͕ͳ͘ͳΔ
133. tailrec
134. ຤ඌ࠶ؼͳؔ਺ͷ࣮ߦΛ࠷దԽ͢Δ
135. ຤ඌ࠶ؼ
136. wؔ਺ܕݴޠͰΑ͘ݟΔελΠϧ
     wϧʔϓͷॲཧΛ୅ସ͢Δ
     wؔ਺ͷ࠷ޙʹࣗ਎Λݺͼग़͢
138. tailrec Modifier
139. දࣔ͢Δϝοηʔδ
140. දࣔ͢Δճ਺
141. ճ਺͕0ҎԼͷ࣌͸return
142. ϝοηʔδΛදࣔͯ͠
143. ճ਺ΛݮΒͯࣗ͠਎Λݺͼग़͢
144. tailrecແ͠Ͱ΋ίϯύΠϧͰ͖Δ
145. ͳʹ͕ҧ͏ͷ͔ʁ
146. tailrecແ͠ͷ৔߹
148. ίϯύΠϧ͞Εͯ΋΄΅ಉ͡
149. 4UBDL0WFS'MPX͕ى͖ΔՄೳੑ͕ߴ͍
151. tailrec͋Γͷ৔߹
152. while͕࣮ߦ͞ΕΔ
153. ࣗ਎Λݺͼग़͞ͳ͍
154. 4UBDL0WFS'MPX͕ى͖ΔՄೳੑ͕௿͘ͳΔ
156. 4UBDL0WFS'MPX͕ى͖ͳ͍Θ͚Ͱ͸ͳ͍
157. Ҏ্
158. &OKPZ
     ,PUMJO