Kotlinでマッチョ💪💪💪💪💪する話

Kotlinでマッチョ💪💪💪💪💪する話

Retty Tech Cafe #8
https://retty.connpass.com/event/45628/

Transcript

1. KotlinͰ

   Ϛονϣ
   ͢Δ࿩
   Retty Tech Cafe #8
   

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2. About Me
   Shinobu Okano
   @operandoOS
   Mercari, Inc.
   Souzoh, Inc.
   

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4. ຖ೔30෼ Kotlin΍ͬͯ·͢
   • ࡶʹࡶʹϝϞΛ࢒ͯ͠·͢
   • http://hack-it-iron.hatenablog.com/archive/
   category/Kotlin
   

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5. Tuple
   ෳ਺ݸͷ஋Λ૊Έʹͯ͠·ͱΊͨ΋ͷ
   

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6. Α͏͸
   Ұ࣌తͳείʔϓͰෳ਺ݸͷσʔλͷ૊Έ߹Θ͕ͤ

   ཉ͍͚͠ͲɺClassΛఆٛ͢Δ΄ͲͰ΋ͳ͍ͳʔ

   ͬͯ࣌ʹ༗ޮ
   

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7. Guild
   https://github.com/operando/Guild/
   Simple java tuples.
   

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8. ͳͥTuple͕ඞཁ͔ͩͬͨ
   • Android + JSON-RPC
   • http://www.slideshare.net/shinobuokano7/
   android-jsonrpc
   • ཧ༝ॻ͍ͯ͋Δ͔΋ʁ
   

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9. KotlinͷPair
   val pair = 1 to "pair"
   println(pair.first) // 1
   println(pair.second) // pair
   

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10. Triple΋͋ΔΑ
    val triple = Triple(1, true, "Triple")
    println(triple.first) // 1
    println(triple.second) // true
    println(triple.third) // Triple
    

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11. ͜ΕΛΈ͓ͯ΋ͬͨ
    

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12. ͜͏ॻ͚ͳ͍ͷʁ
    val triple = 1 to true to "Triple"
    

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13. ͜͏ॻ͚ͳ͍ͷʁ
    val triple = A to B to C
    

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14. ͦͷ··Ͱ͸ॻ͚ͳʔ͍
    • Pair in Pairʹͳͬͯ͠·͏
    • Pair,C>
    • ((1,true)"Triple")
    

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15. ͳʔΜͩɺΧοίΘΔ͍
    

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16. ͦ΋ͦ΋ Pairͷtoͬͯ

    Ͳ͏ͳͬͯΔΜͩ?
    

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17. ͦ΋ͦ΋ PairͷtoͬͯͲ͏ͳͬͯΔΜͩ?
    public infix fun .to(that: B)

    : Pair = Pair(this, that)
    

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18. ͳΔ΄Ͳ
    

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19. ͍΍ɺ·ͯΑ
    

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20. ಉ͡Α͏ʹ֦ுؔ਺

    ࡞Ε͹Ͱ͖Δ͔☺
    

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21. Pair͔ΒTripleΛ࡞Δ֦ுؔ਺Λॻ͍ͯΈͨ
    infix fun Pair.to(that: C)

    : Triple = 

    Triple(this.first, this.second, that)
    

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22. ͡ΌtoͰͭͳ͛ͯ

    ॻ͍ͯΈΑ͏
    

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23. ͡ΌtoͰͭͳ͛ͯॻ͍ͯΈΑ͏
    val triple = 1 to true to "Triple"
    println(triple.first) // 1
    println(triple.second) // true
    println(triple.third) // Triple
    println(triple.javaClass) // class kotlin.Triple
    

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24. Ͱ͖ͨ☺
    

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25. ΋ͬͱϚοεϧ

    ͍ͨ͠Ͱ͠ΐʁ
    

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26. 4ͭͷ஋Λ࣋ͭ

    Tuple QuartetΛ࡞Ζ͏
    

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27. 4ͭͷ஋Λ࣋ͭTuple QuartetΛ࡞Ζ͏
    class Quartet(
    val first: F,
    val second: S,
    val third: T,
    val fourth: FO,) {
    override fun toString(): String {
    return "Quartet(first=$first, second=$second,

    third=$third, fourth=$fourth)"
    }
    }
    

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28. toͭͳ͗ͰQuartetΛ

    ࡞ΕΔΑ͏ʹ͢Δ
    

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29. Triple͔ΒQuartetΛ࡞Δ֦ுؔ਺Λॻ͘
    infix fun Triple.to(that: D):
    Quartet = 

    Quartet(this.first, this.second, this.third, that)
    

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30. Quartet࢖ͬͯΈΑ͏
    val quartet = 1 to 10L to true to "quartet"
    println(quartet.first) // 1
    println(quartet.second) // 10
    println(quartet.third) // true
    println(quartet.fourth) // quartet
    

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31. ΋ͬͱϚοεϧ

    ΄͘͠ͳ͍??
    

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32. 5ͭͷ஋Λ࣋ͭ

    Tuple QuintetΛ࡞Ζ͏
    

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33. 5ͭͷ஋Λ࣋ͭTuple QuintetΛ࡞Ζ͏
    class Quintet(
    val first: F,
    val second: S,
    val third: T,
    val fourth: FO,
    val five: FI) {
    override fun toString(): String {
    return "Quintet(first=$first, second=$second,

    third=$third, fourth=$fourth, five=$five)"
    }
    }
    

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34. ͸͍͸͍ɺtoΛͭͳ͛ͯ

    ॻ͍ͯ࡞Γ͍ͨΑͶ
    

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35. ͸͍͸͍ɺ֦ுؔ਺֦ுؔ਺
    infix fun Quartet.to(that: E):
    Quintet = Quintet(this.first, this.second,
    this.third, this.fourth, that)
    

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36. Quintet࢖ͬͯΈΑ͏
    val quintet = 1 to 10L to true to LocalDateTime.now() to "quintet"
    println(quintet.first) // 1
    println(quintet.second) // 10
    println(quintet.third) // true
    println(quintet.fourth) // 2016-12-09T19:45:38.959
    println(quintet.five) // quintet
    

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37. Libraryʹ͠·ͨ͠
    

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38. Guild Kotlin
    https://github.com/operando/Guild/
    tree/master/guild-kotlin
    ͍͔ͭjCenterͱ͔ʹ͋͛·ʔ͢
    

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39. Links
    • Pair͔ΒTripleΛ࡞Δ֦ுؔ਺Λॻ͍ͯΈͨ - 2016/12/03ͷ30෼ KotlinϝϞ
    • http://hack-it-iron.hatenablog.com/entry/2016/12/03/165601
    • 4ͭͱ5ͭ஋Λ࣋ͭTupleΛ࡞ͬͯΈͨ - 2016/12/04ͷ30෼ KotlinϝϞ
    • http://hack-it-iron.hatenablog.com/entry/2016/12/04/223509
    • TupleϥΠϒϥϦ GuildͷKotlin൛࡞ͬͯΈͨ - 2016/12/09ͷ30෼ KotlinϝϞ
    • http://hack-it-iron.hatenablog.com/entry/2016/12/09/172657
    • Guild
    • https://github.com/operando/Guild/
    

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40. Thanks!
    

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