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

by yamacraft

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͋Μ·Γ৮ΕΒΕͯͳ͍ ؾ͕͢ΔɺKotlin1.3ͷ ͋Γ͕͍ͨ௥Ճػೳ @yamacraft

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

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

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

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

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ͦͷલʹ

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৽ػೳͷνΣοΫͬͯ Ͳ͏΍ͬͯ֬ೝ͠·͔͢ʁ

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UnitTestͰࢼ͢ͷ͕͓͢͢Ί ※ॾઆ͋Γ·͢

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ຊ୊ʹ໭Γ·͢

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

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

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RandomAPIͷ௥Ճ

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

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ίϨΫγϣϯܥʹ isNullOrEmpty()ͷ௥Ճ

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

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unsignedʢූ߸ͳ͠ʣܕͷ ௥Ճ

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

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ifEmpty()ɺifBlankͷ௥Ճ

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

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͓͠·͍