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あんまり触れられてない気がする、Kotlin1.3の ありがたい追加機能

yamacraft
November 29, 2018

あんまり触れられてない気がする、Kotlin1.3の ありがたい追加機能

2018年11月29日(木)にYahoo LODGEで開催された筋肉.ktの資料です

yamacraft

November 29, 2018
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  1. ͋Μ·Γ৮ΕΒΕͯͳ͍
    ؾ͕͢ΔɺKotlin1.3ͷ
    ͋Γ͕͍ͨ௥Ճػೳ
    @yamacraft

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  2. profile
    • @yamacraft
    • Mobile Application Engineer
    • Freelance / (private)team Y.G.E.
    • Getting Over Itɹˠˠˠ
    • 130↑wins / BestTime 8min

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  3. trainingʢonly machineʣ
    • νΣετϓϨε 70ʙ80kg 4ʙ6rep * 3
    • ϩʔσϧτΠυ 65ʙ75kg 4ʙ6rep * 3
    • ϓϧμ΢ϯ 75kg 4ʙ6rep * 3
    • ϨοάϓϨε 125ʙ135kg 4ʙ6rep * 3
    • and more

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  4. physical
    https://athletebody.jp/2017/10/31/skill-level-assessment/

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  5. trouble
    • Ϛγϯ͚ͩͩͱѲྗ͸શવ͔ͭͳ͍
    • CoC #1͕ด͡ΒΕͳͯ͘ԜΜͩ
    • όοΫΤΫεςϯγϣϯ͕δϜʹͳ͍
    • δϜͷϑϦʔ΢ΣΠτκʔϯ͕ڱ͗͢Δ

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  6. Kotlin 1.3Ͱ௥Ճ͞Εͨ
    ͪΐͬͱخ͍͠ػೳͷ঺հ
    https://kotlinlang.org/docs/reference/whatsnew13.html

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  7. ͦͷલʹ

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  8. ৽ػೳͷνΣοΫͬͯ
    Ͳ͏΍ͬͯ֬ೝ͠·͔͢ʁ

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  9. UnitTestͰࢼ͢ͷ͕͓͢͢Ί
    ※ॾઆ͋Γ·͢

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  10. ຊ୊ʹ໭Γ·͢

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  11. Kotlin 1.3Ͱ௥Ճ͞Εͨ
    ͪΐͬͱخ͍͠ػೳͷ঺հ
    https://kotlinlang.org/docs/reference/whatsnew13.html

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  12. RandomAPIͷ௥Ճ
    • kotlin.random.Random͕௥Ճ͞Εͨ
    • ཚ਺ੜ੒ʹjava.util.*Λར༻͠ͳͯ͘ࡁΉΑ͏
    ʹͳͬͨ
    • java.util.Randomಉ༷ʹɺ֤ܕͰग़ྗՄೳ
    • Kotlin Native͋ͨΓ͸͋Γ͕͍ͨ͸ͣ

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  13. RandomAPIͷ௥Ճ

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  14. ίϨΫγϣϯܥʹ
    isNullOrEmpty()ͷ௥Ճ
    • Stringʹ͋ͬͨisNullOrEmpty()͕Collection΍
    ListɺmapͳͲͰར༻Մೳʹͳͬͨ
    • isEmpty()ͳΒલ͔Β͋Γ·ͨ͠
    • nullνΣοΫ΋·ͱΊͯͰ͖ͯେม͋Γ͕͍ͨ

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  15. ίϨΫγϣϯܥʹ
    isNullOrEmpty()ͷ௥Ճ

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  16. unsignedʢූ߸ͳ͠ʣܕͷ
    ௥Ճ
    • UByte … 0ʙ255
    • UShort … 0ʙ65535
    • UInt … 0ʙ2^32-1
    • ULong … 0ʙ2^64-1
    • ਓʹΑͬͯ͸ϝνϟΫνϟ͋Γ͕͍ͨ…

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  17. unsignedʢූ߸ͳ͠ʣܕͷ
    ௥Ճ

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  18. ifEmpty()ɺifBlankͷ௥Ճ
    • if(x.isEmpty){}ͱ΍Βͣʹɺx.ifEmpty{}Ͱۭ΍
    ۭന࣌ͷॲཧ͕͍͖ͳΓॻ͚ΔΑ͏ʹͳͬͨ
    • kotlinΆ͘ͳͬͯ͋Γ͕͍ͨ

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  19. ifEmpty()ɺifBlankͷ௥Ճ

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  20. ଞʹ΋͍Ζ͍Ζ͋ΔͷͰ
    νΣοΫͯ͠ΈΑ͏ʂ
    https://kotlinlang.org/docs/reference/whatsnew13.html

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  21. ͓͠·͍

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