Report from KotlinConf 2018

# Event
Android Bazaar Conference 2018 Autumn in KAWASAKI
https://abc.android-group.jp/2018a/

# Links
KotlinConf 2018 Announcements
https://blog.jetbrains.com/kotlin/2018/10/kotlinconf-2018-announcements/

Kotlin for Java Developers / Coursera
https://www.coursera.org/learn/kotlin-for-java-developers

Atomic Kotlin
https://www.atomickotlin.com/

Kotlin イン・アクション
https://www.amazon.co.jp/Kotlin%E3%82%A4%E3%83%B3%E3%83%BB%E3%82%A2%E3%82%AF%E3%82%B7%E3%83%A7%E3%83%B3-Dmitry-Jemerov/dp/4839961743

kotl.in links
http://kotl.in/foundation
http://kotl.in/coroutines
http://kotl.in/native
http://kotl.in/multiplatform
http://kotl.in/1.3
http://kotl.in/learn

Transcript

1. KotlinConf 2018 ࠷଎Ϩϙʔτ 2018.10.13 Android Bazaar and Conference @satorufujiwara
2. About me Satoru Fujiwara (@satorufujiwara) Developer Relations @ LINE Corp Organizer of Shibuya.apk & JKUG ༁ॻ : Kotlin ΠϯɾΞΫγϣϯ ஶॻ : Android ΞϓϦઃܭύλʔϯೖ໳
3. Kotlin & Me • 2015೥3݄ΑΓKotlinͰAndroidΞϓϦΛ։ൃ • 2017೥ ʮKotlin ΠϯɾΞΫγϣϯʯΛ຋༁ • 2018೥ ೔ຊKotlinϢʔβάϧʔϓͱͯ͠ʮKotlin Fest 2018ʯΛओ࠵ • dex.fm #58 ͰKotlinʹ͍͍ͭͯΖ͍Ζ࿩ͯ͠·͢
4. KotlinConf 2018 ࠷଎ʁϨϙʔτ
5. KotlinConf ͱ͸ • ʮKotlinʯΛςʔϚʹͨ͠ΧϯϑΝϨϯε • JetBrains͕ओ࠵ • ڈ೥(αϯϑϥϯγεί)ʹଓ͖2ճ໨ͷ։࠵ • 1300ਓҎ্ͷࢀՃऀ (νέοτ׬ചɺڈ೥΋΄΅ಉ਺Ͱ׬ച)
6. ୈೋճ໨͸ΦϥϯμͷΞϜεςϧμϜͰ։࠵
7. 7 ձ৔पล
8. 8 ձ৔֎؍
9. 9 ϒʔεΤϦΞ
10. 10 Ωʔϊʔτձ৔
11. 11 ηογϣϯ෦԰
12. 12 খηογϣϯձ৔
13. 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!
14. KotlinConf 2018 Keynote
15. Kotlin Conf 2018 Keynote • KotlinͷݴޠઃܭऀͰ͋Δ Andrey Breslav ࢯ͕ొஃ • ಈը͕ެ։͞Ε͍ͯΔ • JetBrains BlogʮKotlinConf 2018 Announcementsʯ • https://blog.jetbrains.com/kotlin/2018/10/kotlinconf-2018-announcements/
16. Keynote Topics • KotlinͷݴޠઃܭͷՁ஋؍ʮPragmaticʯ • Momentum = Kotlinͷ੝Γ্͕Γ • Industry = Kotlinͷۀքಈ޲ • Kotlin 1.3ʹ͍ͭͯ • Evolution = KotlinͷਐԽͷํ޲ੑ
17. Pragmatic
18. Pragmatic • ʮ࣮༻ओٛʯ • Kotlinͷݴޠઃܭʹ͓͚ΔҰ؏͠ ͨՁ஋؍ • ࣮૷ऀͷߟ͑Λͦͷ··ιϑτ΢Σ Ξʹམͱ͠ࠐΊΔ
19. Kotlin ͷ Pragmatic • Concision Ͱ͸ͳ͘ Readability • Expressiveness Ͱ͸ͳ͘ Reuse • Originality Ͱ͸ͳ͘ Interoperability • Soundness Ͱ͸ͳ͘ Safety / Tooling
20. Concision Ͱ͸ͳ͘ Readability • ؆ܿ͞(Concision)Ͱ͸ͳ͘ಡΈ΍͢͞(Readability)Λॏࢹ • ίʔυ͕୹͚Ε͹ྑ͍ͱ͍͏΋ͷͰ͸ͳ͍ • ϘΠϥʔϓϨʔτ͸ݮΒ͠ɺॻ͍ͨίʔυશͯʹҙຯ͕͋ΔΑ ͏ʹ
21. ExpressivenessͰ͸ͳ͘ Reuse • දݱྗ๛͔(Expressiveness)ʹ͢ΔͷͰ͸ͳ͘ɺ࠶ར༻Մೳ (Reuse)ʹ͢Δ • ඪ४ϥΠϒϥϦʹΑ͘࢖ΘΕΔύλʔϯΛೖΕ͍ͯΔ
22. Originality Ͱ͸ͳ͘Interoperability • ಠࣗੑ(Originality)Λ௥ٻ͢ΔͷͰ͸ͳ͘ɺ૬ޓӡ༻ੑ (Interoperability)Λ௥ٻ • ଞͷݴޠʹ͢Ͱʹ͋Δػೳ΍஌ݟΛऔΓೖΕΔ
23. Soundness Ͱ͸ͳ͘ Safety / Tooling • ݴޠతͳݎ࿚͞(Soundness)Λॏࢹ͢ΔͷͰ͸ͳ͘ɺ҆શ͞ (Safety)΍πʔϧʹΑΔαϙʔτ(Tooling)Λॏࢹ • Kotlin͕੩తܕ෇͖ݴޠͰ͋Δཧ༝
24. Kotlinͷ࣮༻ओٛ (Pragmatic) • ಡΈ΍͘͢ (Readability) • ࠶ར༻ՄೳͰ (Reuse) • ૬ޓӡ༻ੑ͕͋Γ (Interoperability) • ҆શͰ (Safety) • πʔϧ͕ॆ࣮ (Tooling)
25. Momentum
26. Kotlinͷ੝Γ্͕Γ (Momentum) • 2018೥10݄࣌఺Ͱ1.5M(1500ສ)ਓͷ։ൃऀ • Google Play 1000ҐҎ಺ͷAndroidΞϓϦͷ1/4͕KotlinΛ࢖༻ • KotlinΛ࢖ͬͨAndroidΞϓϦ͕1೥Ͱ4ഒʹ • αʔόͰͷ࢖༻͸MAUϕʔεͰ2ഒʹ • 50ਓऑͷ։ൃνʔϜɾ250ਓҎ্ͷKontributor
27. Industry
28. 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
29. Kotlin 1.3
30. Kotlin 1.3 • ಛผͳൃද͸ͳ͍ɺͳͥͳΒKotlin͸OSSͰ͋Γɺมߋ఺ͷશͯ ͕GitHub্ʹ͋Δ͔Β • JetBrains BlogʮKotlinConf 2018 Announcementsʯ΍ kotl.in/1.3 ʹมߋ఺͕هࡌ͞Ε͍ͯ·͢
31. Kotlin 1.3 • Coroutines͕Stableʹ • Kotlin/Native͕BETAϦϦʔε • Ϗϧυ͕࣌ؒ1.2.10ʹൺ΂ͯ75ˋ΄Ͳʹ • Contracts / Inline classesͳͲͷexperimentalͳػೳ͕௥Ճ
32. 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
33. Evolution
34. ϓϩάϥϛϯάݴޠͷਐԽ(Evolution) • Keep the language modern • Comfortable update • ͜ΕΒ͸͓ޓ͍ʹ੍໿͕͋Δ΋ͷͳͷͰόϥϯεΛͱΔඞཁ͕ ͋Δ • KotlinͰ͸IDEʹΑΔϙοϓΞοϓ΍ɺࣗಈͰͷMigrationͳͲΛ ࢖͍ɺշదͳҠߦΛॿ͚Δ
35. KotlinͷਐԽͷͨΊʹ • Feedback loop ͕େࣄ • ͦͷͨΊʹϦϦʔεલʹ͸EAP΍RCόʔδϣϯΛग़͢
36. Learning
37. Kotlinͷֶश • CourseraʹʮKotlin for Java Developersʯͱ͍͏ίʔε͕͋Δ • https://www.coursera.org/learn/kotlin-for-java-developers • Atomic Kotlinͱ͍͏ຊ͕ݱࡏࣥච͞Ε͍ͯΔ • https://www.atomickotlin.com/ • ΞʔϦʔΞΫηε͕Մೳ
38. Kotlinͷ೔ຊޠϦιʔε • ʮKotlin ΠϯɾΞΫγϣϯʯ • ຊ೔࿩Λͨ͠Kotlinͷݴޠઃܭͷ఩ֶͰ͋ ΔPragmaticʹ͍ͭͯ΋ॻ͔Ε͍ͯΔ
39. One more thing…
40. kotl.in links • kotl.in/foundation • kotl.in/coroutines • kotl.in/native • kotl.in/multiplatform • kotl.in/1.3 • kotl.in/learn
41. HAVE A NICE KOTLIN!