2018年11月29日(木)にYahoo LODGEで開催された筋肉.ktの資料です
͋Μ·Γ৮ΕΒΕͯͳ͍ؾ͕͢ΔɺKotlin1.3ͷ͋Γ͕͍ͨՃػೳ@yamacraft
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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
physicalhttps://athletebody.jp/2017/10/31/skill-level-assessment/
trouble• Ϛγϯ͚ͩͩͱѲྗશવ͔ͭͳ͍• CoC #1͕ด͡ΒΕͳͯ͘ԜΜͩ• όοΫΤΫεςϯγϣϯ͕δϜʹͳ͍• δϜͷϑϦʔΣΠτκʔϯ͕ڱ͗͢Δ
Kotlin 1.3ͰՃ͞Εͨͪΐͬͱخ͍͠ػೳͷհhttps://kotlinlang.org/docs/reference/whatsnew13.html
ͦͷલʹ
৽ػೳͷνΣοΫͬͯͲ͏ͬͯ֬ೝ͠·͔͢ʁ
UnitTestͰࢼ͢ͷ͕͓͢͢Ί※ॾઆ͋Γ·͢
ຊʹΓ·͢
RandomAPIͷՃ• kotlin.random.Random͕Ճ͞Εͨ• ཚੜʹjava.util.*Λར༻͠ͳͯ͘ࡁΉΑ͏ʹͳͬͨ• java.util.Randomಉ༷ʹɺ֤ܕͰग़ྗՄೳ• Kotlin Native͋ͨΓ͋Γ͕͍ͨͣ
RandomAPIͷՃ
ίϨΫγϣϯܥʹisNullOrEmpty()ͷՃ• Stringʹ͋ͬͨisNullOrEmpty()͕CollectionListɺmapͳͲͰར༻Մೳʹͳͬͨ• isEmpty()ͳΒલ͔Β͋Γ·ͨ͠• nullνΣοΫ·ͱΊͯͰ͖ͯେม͋Γ͕͍ͨ
ίϨΫγϣϯܥʹisNullOrEmpty()ͷՃ
unsignedʢූ߸ͳ͠ʣܕͷՃ• UByte … 0ʙ255• UShort … 0ʙ65535• UInt … 0ʙ2^32-1• ULong … 0ʙ2^64-1• ਓʹΑͬͯϝνϟΫνϟ͋Γ͕͍ͨ…
unsignedʢූ߸ͳ͠ʣܕͷՃ
ifEmpty()ɺifBlankͷՃ• if(x.isEmpty){}ͱΒͣʹɺx.ifEmpty{}Ͱۭۭന࣌ͷॲཧ͕͍͖ͳΓॻ͚ΔΑ͏ʹͳͬͨ• kotlinΆ͘ͳͬͯ͋Γ͕͍ͨ
ifEmpty()ɺifBlankͷՃ
ଞʹ͍Ζ͍Ζ͋ΔͷͰνΣοΫͯ͠ΈΑ͏ʂhttps://kotlinlang.org/docs/reference/whatsnew13.html
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