Report from KotlinConf 2018

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KotlinConf 2018 ࠷଎Ϩϙʔτ 2018.10.13 Android Bazaar and Conference @satorufujiwara

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About me Satoru Fujiwara (@satorufujiwara) Developer Relations @ LINE Corp Organizer of Shibuya.apk & JKUG ༁ॻ : Kotlin ΠϯɾΞΫγϣϯ ஶॻ : Android ΞϓϦઃܭύλʔϯೖ໳

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Kotlin & Me • 2015೥3݄ΑΓKotlinͰAndroidΞϓϦΛ։ൃ • 2017೥ ʮKotlin ΠϯɾΞΫγϣϯʯΛ຋༁ • 2018೥ ೔ຊKotlinϢʔβάϧʔϓͱͯ͠ʮKotlin Fest 2018ʯΛओ࠵ • dex.fm #58 ͰKotlinʹ͍͍ͭͯΖ͍Ζ࿩ͯ͠·͢

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KotlinConf 2018 ࠷଎ʁϨϙʔτ

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KotlinConf ͱ͸ • ʮKotlinʯΛςʔϚʹͨ͠ΧϯϑΝϨϯε • JetBrains͕ओ࠵ • ڈ೥(αϯϑϥϯγεί)ʹଓ͖2ճ໨ͷ։࠵ • 1300ਓҎ্ͷࢀՃऀ (νέοτ׬ചɺڈ೥΋΄΅ಉ਺Ͱ׬ച)

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ୈೋճ໨͸ΦϥϯμͷΞϜεςϧμϜͰ։࠵

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7 ձ৔पล

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8 ձ৔֎؍

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9 ϒʔεΤϦΞ

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10 Ωʔϊʔτձ৔

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11 ηογϣϯ෦԰

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12 খηογϣϯձ৔

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Kotlin Conf 2018 Sessions • Keynote + 63 Sessions + Closing Panel • શͯ࿥ը͕ެ։͞ΕΔ • Coroutine / Multiplatform(iOSؚΉ) / Server Side ͕ଟΊ • Android ݻ༗ͷSession͸3ͭ • Android Suspenders • Shaping your app’s architecture with Kotlin and Architecture Components • Android KTX: A dash of Kotlin makes all the difference!

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KotlinConf 2018 Keynote

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Kotlin Conf 2018 Keynote • KotlinͷݴޠઃܭऀͰ͋Δ Andrey Breslav ࢯ͕ొஃ • ಈը͕ެ։͞Ε͍ͯΔ • JetBrains BlogʮKotlinConf 2018 Announcementsʯ • https://blog.jetbrains.com/kotlin/2018/10/kotlinconf-2018-announcements/

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Keynote Topics • KotlinͷݴޠઃܭͷՁ஋؍ʮPragmaticʯ • Momentum = Kotlinͷ੝Γ্͕Γ • Industry = Kotlinͷۀքಈ޲ • Kotlin 1.3ʹ͍ͭͯ • Evolution = KotlinͷਐԽͷํ޲ੑ

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Pragmatic

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Pragmatic • ʮ࣮༻ओٛʯ • Kotlinͷݴޠઃܭʹ͓͚ΔҰ؏͠ ͨՁ஋؍ • ࣮૷ऀͷߟ͑Λͦͷ··ιϑτ΢Σ Ξʹམͱ͠ࠐΊΔ

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Kotlin ͷ Pragmatic • Concision Ͱ͸ͳ͘ Readability • Expressiveness Ͱ͸ͳ͘ Reuse • Originality Ͱ͸ͳ͘ Interoperability • Soundness Ͱ͸ͳ͘ Safety / Tooling

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Concision Ͱ͸ͳ͘ Readability • ؆ܿ͞(Concision)Ͱ͸ͳ͘ಡΈ΍͢͞(Readability)Λॏࢹ • ίʔυ͕୹͚Ε͹ྑ͍ͱ͍͏΋ͷͰ͸ͳ͍ • ϘΠϥʔϓϨʔτ͸ݮΒ͠ɺॻ͍ͨίʔυશͯʹҙຯ͕͋ΔΑ ͏ʹ

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ExpressivenessͰ͸ͳ͘ Reuse • දݱྗ๛͔(Expressiveness)ʹ͢ΔͷͰ͸ͳ͘ɺ࠶ར༻Մೳ (Reuse)ʹ͢Δ • ඪ४ϥΠϒϥϦʹΑ͘࢖ΘΕΔύλʔϯΛೖΕ͍ͯΔ

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Originality Ͱ͸ͳ͘Interoperability • ಠࣗੑ(Originality)Λ௥ٻ͢ΔͷͰ͸ͳ͘ɺ૬ޓӡ༻ੑ (Interoperability)Λ௥ٻ • ଞͷݴޠʹ͢Ͱʹ͋Δػೳ΍஌ݟΛऔΓೖΕΔ

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Soundness Ͱ͸ͳ͘ Safety / Tooling • ݴޠతͳݎ࿚͞(Soundness)Λॏࢹ͢ΔͷͰ͸ͳ͘ɺ҆શ͞ (Safety)΍πʔϧʹΑΔαϙʔτ(Tooling)Λॏࢹ • Kotlin͕੩తܕ෇͖ݴޠͰ͋Δཧ༝

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Kotlinͷ࣮༻ओٛ (Pragmatic) • ಡΈ΍͘͢ (Readability) • ࠶ར༻ՄೳͰ (Reuse) • ૬ޓӡ༻ੑ͕͋Γ (Interoperability) • ҆શͰ (Safety) • πʔϧ͕ॆ࣮ (Tooling)

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Momentum

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Kotlinͷ੝Γ্͕Γ (Momentum) • 2018೥10݄࣌఺Ͱ1.5M(1500ສ)ਓͷ։ൃऀ • Google Play 1000ҐҎ಺ͷAndroidΞϓϦͷ1/4͕KotlinΛ࢖༻ • KotlinΛ࢖ͬͨAndroidΞϓϦ͕1೥Ͱ4ഒʹ • αʔόͰͷ࢖༻͸MAUϕʔεͰ2ഒʹ • 50ਓऑͷ։ൃνʔϜɾ250ਓҎ্ͷKontributor

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Industry

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Kotlinͷۀքಈ޲ (Industry) • ALL FOR SIZES - ͋ΒΏΔۀछͰͷར༻͕૿͖͍͑ͯͯΔ • ελʔτΞοϓ΍ۚ༥ۀքͳͲ • Microsoft͸ϞόΠϧͷSDKΛKotlin΁Ҡߦ͠APIΛҡ࣋ͨ͠··ɺ 25ˋͷίʔυ࡟ݮ • JetBrains / Google ͕ࢧԉ͢Δ Foundation ͷઃཱ • ཧࣄʹAndreyࢯ(JetBrains)ɺStephanieࢯ(Google, Android)ͳͲ

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Kotlin 1.3

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Kotlin 1.3 • ಛผͳൃද͸ͳ͍ɺͳͥͳΒKotlin͸OSSͰ͋Γɺมߋ఺ͷશͯ ͕GitHub্ʹ͋Δ͔Β • JetBrains BlogʮKotlinConf 2018 Announcementsʯ΍ kotl.in/1.3 ʹมߋ఺͕هࡌ͞Ε͍ͯ·͢

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Kotlin 1.3 • Coroutines͕Stableʹ • Kotlin/Native͕BETAϦϦʔε • Ϗϧυ͕࣌ؒ1.2.10ʹൺ΂ͯ75ˋ΄Ͳʹ • Contracts / Inline classesͳͲͷexperimentalͳػೳ͕௥Ճ

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Kotlin1.3 ؔ࿈͓͢͢Ίηογϣϯ • Coroutines • Exploring Coroutines in Kotlin / DAY2 10:15 • Kotlin Coroutines in Practice / DAY2 13:00 • Multiplatform • Kotlin/Native concurrency model / DAY1 15:15 • Effective multiplatform Kotlin development / DAY1 17:15 • Contracts • New Type Inference and Related Language Features / DAY1 16:15

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Evolution

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ϓϩάϥϛϯάݴޠͷਐԽ(Evolution) • Keep the language modern • Comfortable update • ͜ΕΒ͸͓ޓ͍ʹ੍໿͕͋Δ΋ͷͳͷͰόϥϯεΛͱΔඞཁ͕ ͋Δ • KotlinͰ͸IDEʹΑΔϙοϓΞοϓ΍ɺࣗಈͰͷMigrationͳͲΛ ࢖͍ɺշదͳҠߦΛॿ͚Δ

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KotlinͷਐԽͷͨΊʹ • Feedback loop ͕େࣄ • ͦͷͨΊʹϦϦʔεલʹ͸EAP΍RCόʔδϣϯΛग़͢

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Learning

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Kotlinͷֶश • CourseraʹʮKotlin for Java Developersʯͱ͍͏ίʔε͕͋Δ • https://www.coursera.org/learn/kotlin-for-java-developers • Atomic Kotlinͱ͍͏ຊ͕ݱࡏࣥච͞Ε͍ͯΔ • https://www.atomickotlin.com/ • ΞʔϦʔΞΫηε͕Մೳ

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Kotlinͷ೔ຊޠϦιʔε • ʮKotlin ΠϯɾΞΫγϣϯʯ • ຊ೔࿩Λͨ͠Kotlinͷݴޠઃܭͷ఩ֶͰ͋ ΔPragmaticʹ͍ͭͯ΋ॻ͔Ε͍ͯΔ

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One more thing…

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kotl.in links • kotl.in/foundation • kotl.in/coroutines • kotl.in/native • kotl.in/multiplatform • kotl.in/1.3 • kotl.in/learn

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HAVE A NICE KOTLIN!