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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
Technology
0
1.1k
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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Transcript
͋Μ·Γ৮ΕΒΕͯͳ͍ ؾ͕͢ΔɺKotlin1.3ͷ ͋Γ͕͍ͨՃػೳ @yamacraft
profile • @yamacraft • Mobile Application Engineer • Freelance /
(private)team Y.G.E. • Getting Over Itɹˠˠˠ • 130↑wins / BestTime 8min
trainingʢonly machineʣ • νΣετϓϨε 70ʙ80kg 4ʙ6rep * 3 • ϩʔσϧτΠυ
65ʙ75kg 4ʙ6rep * 3 • ϓϧμϯ 75kg 4ʙ6rep * 3 • ϨοάϓϨε 125ʙ135kg 4ʙ6rep * 3 • and more
physical https://athletebody.jp/2017/10/31/skill-level-assessment/
trouble • Ϛγϯ͚ͩͩͱѲྗશવ͔ͭͳ͍ • CoC #1͕ด͡ΒΕͳͯ͘ԜΜͩ • όοΫΤΫεςϯγϣϯ͕δϜʹͳ͍ • δϜͷϑϦʔΣΠτκʔϯ͕ڱ͗͢Δ
Kotlin 1.3ͰՃ͞Εͨ ͪΐͬͱخ͍͠ػೳͷհ https://kotlinlang.org/docs/reference/whatsnew13.html
ͦͷલʹ
৽ػೳͷνΣοΫͬͯ Ͳ͏ͬͯ֬ೝ͠·͔͢ʁ
UnitTestͰࢼ͢ͷ͕͓͢͢Ί ※ॾઆ͋Γ·͢
ຊʹΓ·͢
Kotlin 1.3ͰՃ͞Εͨ ͪΐͬͱخ͍͠ػೳͷհ https://kotlinlang.org/docs/reference/whatsnew13.html
RandomAPIͷՃ • kotlin.random.Random͕Ճ͞Εͨ • ཚੜʹjava.util.*Λར༻͠ͳͯ͘ࡁΉΑ͏ ʹͳͬͨ • java.util.Randomಉ༷ʹɺ֤ܕͰग़ྗՄೳ • Kotlin
Native͋ͨΓ͋Γ͕͍ͨͣ
RandomAPIͷՃ
ίϨΫγϣϯܥʹ isNullOrEmpty()ͷՃ • Stringʹ͋ͬͨisNullOrEmpty()͕Collection ListɺmapͳͲͰར༻Մೳʹͳͬͨ • isEmpty()ͳΒલ͔Β͋Γ·ͨ͠ • nullνΣοΫ·ͱΊͯͰ͖ͯେม͋Γ͕͍ͨ
ίϨΫγϣϯܥʹ isNullOrEmpty()ͷՃ
unsignedʢූ߸ͳ͠ʣܕͷ Ճ • UByte … 0ʙ255 • UShort … 0ʙ65535
• UInt … 0ʙ2^32-1 • ULong … 0ʙ2^64-1 • ਓʹΑͬͯϝνϟΫνϟ͋Γ͕͍ͨ…
unsignedʢූ߸ͳ͠ʣܕͷ Ճ
ifEmpty()ɺifBlankͷՃ • if(x.isEmpty){}ͱΒͣʹɺx.ifEmpty{}Ͱۭ ۭന࣌ͷॲཧ͕͍͖ͳΓॻ͚ΔΑ͏ʹͳͬͨ • kotlinΆ͘ͳͬͯ͋Γ͕͍ͨ
ifEmpty()ɺifBlankͷՃ
ଞʹ͍Ζ͍Ζ͋ΔͷͰ νΣοΫͯ͠ΈΑ͏ʂ https://kotlinlang.org/docs/reference/whatsnew13.html
͓͠·͍