Kotlin Dynamic type

集まれSwift好き！Swift愛好会 vol.77 @ DeNA
2023/09/26

Transcript

1. ೔޲ڧ೥݄೔
   %ZOBNJDUZQF
   ू·Ε4XJGU޷͖ʂ4XJGUѪ޷ձWPM
   ू·Ε,PUMJO޷͖ʂ,PUMJOѪ޷ձWPM!%F/"
   

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2. w ೔޲ڧ
   w J04ΤϯδχΞ
   

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3. %ZOBNJDUZQF
   

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4. w ೔޲ڧ
   w J04Τ
   ϯδχ
   Ξ
   

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5. %ZOBNJD
   UZQF
   

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6. fun dynamicFun(x: dynamic): Unit {
   val dyn: dynamic = ...
   }
   ,PUMJO%ZOBNJDUZQF
   

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7. %ZOBNJDUZQF
   

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8. %ZOBNJDUZQF
   w EZOBNJDܕ
   w WBMEZOEZOBNJDʜ
   w ͳΜͰ΋ೖΔ
   

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9. fun dynamicFun(x: dynamic): Unit {
   }
   

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10. fun dynamicFun(x: dynamic): Unit {
    }
    fun anyFun(x: Any): Unit {
    }
    

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11. fun dynamicFun(x: dynamic): Unit {
    x.god
    }
    fun anyFun(x: Any): Unit {
    x.god // ←ίϯύΠϧΤϥʔ
    }
    

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12. %ZOBNJDUZQF
    w EZOBNJDܕ
    w WBMEZOEZOBNJDʜ
    w ͳΜͰ΋ೖΔ
    w ܕνΣοΫΛߦΘͳ͍ʢίϯύΠϧΤϥʔʹͳΒͳ͍ʣ
    

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13. // x͸Human
    fun dynamicFun(x: dynamic): Unit {
    x.back.left.left.up.scratch()
    }
    class Back {
    val left: Back
    get() = Back()
    val right: Back
    get() = Back()
    val up: Back
    get() = Back()
    val down: Back
    get() = Back()
    fun scratch(): Unit {
    println(“ຬ଍ʂ”)
    }
    }
    class Human {
    val back = Back()
    }
    

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14. %ZOBNJDUZQF
    w EZOBNJDܕ
    w WBMEZOEZOBNJDʜ
    w ͳΜͰ΋ೖΔ
    w ܕνΣοΫΛߦΘͳ͍ʢίϯύΠϧΤϥʔʹͳΒͳ͍ʣ
    w ࣗ༝ʹϓϩύςΟ΍ؔ਺Λݺ΂Δ
    w EZOBNJDܕͷϓϩύςΟ΍ؔ਺ͷϦλʔϯ͸EZOBNJDܕ
    

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15. fun dynamicPlus(x: dynamic, y: dynamic): Unit {
    x + y
    }
    

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16. fun dynamicPlus(x: dynamic, y: dynamic): Unit {
    x + y // 3
    }
    dynamicPlus(1, 2)
    

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17. fun dynamicPlus(x: dynamic, y: dynamic): Unit {
    x + y // ೔޲ڧ
    }
    dynamicPlus(“೔޲”, “ڧ”)
    

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18. fun dynamicPlus(x: dynamic, y: dynamic): Unit {
    x + y // iOSΤϯδχΞ
    }
    dynamicPlus(“iOS”, “ΤϯδχΞ”)
    

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19. fun dynamicPlus(x: dynamic, y: dynamic): Unit {
    x + y // 105ΤϯδχΞ
    }
    dynamicPlus(105, “ΤϯδχΞ”)
    

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20. %ZOBNJDUZQF
    w EZOBNJDܕ
    w WBMEZOEZOBNJDʜ
    w ͳΜͰ΋ೖΔ
    w ܕνΣοΫ͸ߦΘͳ͍ʢίϯύΠϧΤϥʔʹͳΒͳ͍ʣ
    w ࣗ༝ʹϓϩύςΟ΍ؔ਺Λݺ΂Δ
    w EZOBNJDܕͷϓϩύςΟ͸EZOBNJDܕ
    w EZOBNJDಉ࢜ͷܭࢉ΋Մೳ
    

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21. ͍͢͝ʂ
    

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22. ͸͡ΊΑ͏
    

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23. ,PUMJO+4
    

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24. IUUQTLPUMJOMBOHPSHEPDTEZOBNJDUZQFIUNM
    %ZOBNJDUZQF
    

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25. View Slide