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@soulesidibe Code sharing with Kotlin multi-platform Use the tools you love but share what is common

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Agenda • Kotlin Multiplatform • A demo • Questions

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Client Side development

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Client Side development Android IOS Web

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Client Side development Android IOS Web Java 6/7/8

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Client Side development Android IOS Web Java 6/7/8 Kotlin

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Client Side development Android IOS Web Java 6/7/8 Kotlin Objectif-C

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Client Side development Android IOS Web Java 6/7/8 Kotlin Objectif-C Swift

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Client Side development Android IOS Web Java 6/7/8 Kotlin Objectif-C Swift JavaScript

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Client Side development Android IOS Web Java 6/7/8 Kotlin Objectif-C Swift JavaScript

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Client Side development Android IOS Web

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Client Side development Android IOS Web UI

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Client Side development Android IOS Web UI BUSINESS LOGIC

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Client Side development Android IOS Web UI BUSINESS LOGIC IO

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Client Side development Android IOS Web UI BUSINESS LOGIC IO Backend

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Client Side development Android IOS Web UI BUSINESS LOGIC IO Backend

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Client Side development Android IOS Web UI BUSINESS LOGIC IO Backend

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Client Side development Android IOS Web UI BUSINESS LOGIC IO Backend

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Client Side development Android IOS Web UI BUSINESS LOGIC IO

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Client Side development Android IOS Web UI IO UI UI IO IO Busines Busines Busines

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Client Side development Android IOS Web UI IO UI UI IO IO Busines Busines Busines • 1 set of features • 3 teams / plate-forms supported • 3 Codebases/implementations • 3x the amount of issues

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Client Side development Android IOS Web UI BUSINESS LOGIC IO

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Client Side development Android IOS Web UI BUSINESS LOGIC IO

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Client Side development Android IOS Web UI BUSINESS LOGIC IO

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Client Side development • Fast to build apps • Hot Reload • Easy to learn • Js Ecosystem • New programming language • It’s not native

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Kotlin Multiplatform

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Android IOS Web UI BUSINESS LOGIC IO Kotlin Multiplatform • Modern Programming language by Jetbrains • Concise, Safe, Interoperable • Great tooling • Server side • Android default language • Kotlin Native (Windows, Mac, IOS, Linux, WA) • Web development (react, node js, etc)

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Android IOS Web UI BUSINESS LOGIC IO Kotlin Multiplatform • Sharing Code Between Platforms

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Android IOS Web UI BUSINESS LOGIC IO Kotlin Multiplatform • Sharing Code Between Platforms Kotlin Common K otlin/JV M K otlin/JS Kotlin/Native ByteCode JS C ode Native Code

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Android IOS Web UI BUSINESS LOGIC IO Kotlin Multiplatform • Sharing Code Between Platforms Kotlin Common K otlin/JV M K otlin/JS Kotlin/Native ByteCode JS C ode Native Code

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Android IOS Web UI BUSINESS LOGIC IO Kotlin Multiplatform • Sharing Code Between Platforms Kotlin Common K otlin/JV M K otlin/JS Kotlin/Native ByteCode JS C ode Native Code UI UI

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Android IOS Web UI SPECIFIC CODE (if Needed) Kotlin Multiplatform • Sharing Code Between Platforms Kotlin Common K otlin/JV M K otlin/JS Kotlin/Native ByteCode JS C ode Native Code UI UI BUSINESS LOGIC IO

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Android IOS Web Native UI Jetpack Compose SPECIFIC CODE (if Needed) Kotlin Multiplatform: Sharing Code Between Platforms • Sharing Code Between Platforms Kotlin Common K otlin/JV M K otlin/JS Kotlin/Native ByteCode JS C ode Native Code SWIFT UI, Objectif-C JS BUSINESS LOGIC IO

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Android IOS Web Native UI Jetpack Compose SPECIFIC CODE (if Needed) Kotlin Multiplatform: Sharing Code Between Platforms • Sharing Code Between Platforms Kotlin Common K otlin/JV M K otlin/JS Kotlin/Native ByteCode JS C ode Native Code SWIFT UI, Objectif-C JS BUSINESS LOGIC IO .aar .jar .framework optimized js

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Android IOS Web Native UI Jetpack Compose SPECIFIC CODE (if Needed) Kotlin Multiplatform: Sharing Code Between Platforms SWIFT UI, Objectif-C JS BUSINESS LOGIC IO

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Android IOS Web Native UI Jetpack Compose SPECIFIC CODE (if Needed) Kotlin Multiplatform: Sharing Code Between Platforms SWIFT UI, Objectif-C JS BUSINESS LOGIC IO

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Android IOS Web Native UI Jetpack Compose SPECIFIC CODE (if Needed) Kotlin Multiplatform: Sharing Code Between Platforms SWIFT UI, Objectif-C JS BUSINESS LOGIC IO

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Android IOS Web Native UI Jetpack Compose SPECIFIC CODE (if Needed) Kotlin Multiplatform: Sharing Code Between Platforms SWIFT UI, Objectif-C JS BUSINESS LOGIC IO • Gradle build tool

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Android IOS Web Native UI Jetpack Compose SPECIFIC CODE (if Needed) Kotlin Multiplatform: Sharing Code Between Platforms SWIFT UI, Objectif-C JS BUSINESS LOGIC IO • Gradle build tool

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Android IOS Web Native UI Jetpack Compose SPECIFIC CODE (if Needed) Kotlin Multiplatform: Sharing Code Between Platforms SWIFT UI, Objectif-C JS BUSINESS LOGIC IO • Gradle build tool

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Android IOS Web Native UI Jetpack Compose SPECIFIC CODE (if Needed) Kotlin Multiplatform: Sharing Code Between Platforms SWIFT UI, Objectif-C JS BUSINESS LOGIC IO • Gradle build tool

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Android IOS Web Native UI Jetpack Compose SPECIFIC CODE (if Needed) Kotlin Multiplatform: Sharing Code Between Platforms SWIFT UI, Objectif-C JS BUSINESS LOGIC IO • Gradle build tool

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Android IOS Web Native UI Jetpack Compose SPECIFIC CODE (if Needed) Kotlin Multiplatform: Sharing Code Between Platforms SWIFT UI, Objectif-C JS BUSINESS LOGIC IO • Gradle build tool StdLib Coroutines Serialization IO Date Doc

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CALM DOWN. I WILL NOT LIVE CODING DEMO

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Wrap up •Kotlin is a great programming language

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Wrap up •Kotlin is a great programming language •Jetbrains is a great tooling company

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Wrap up •Kotlin is a great programming language •Jetbrains is a great tooling company •Business logic writes once and runs everywhere

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Wrap up •Kotlin is a great programming language •Jetbrains is a great tooling company •Business logic writes once and runs everywhere •Code sharing force you re-think your architecture

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Wrap up •Kotlin is a great programming language •Jetbrains is a great tooling company •Business logic writes once and runs everywhere •Code sharing force you re-think your architecture •Performance

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Wrap up •Still in experimental

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Wrap up •Still in experimental •Limited number of multiplatform libs

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Wrap up •Still in experimental •Limited number of multiplatform libs •Not great for prototyping

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Wrap up •Still in experimental •Limited number of multiplatform libs •Not great for prototyping •Setup-build-deploy curve is tough for the firsts tries

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Wrap up source : KotlinConf 2019 Keynote

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Links kobiri.app/kotlinjs

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Links kobiri.app/kotlinjs

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Links kobiri.app/kmp_ios_and_android

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Links kobiri.app/venkat_kotlin

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Sources •https://www.jetbrains.com/lp/mobilecrossplatform/ •kobiri.app/kotlinconf2019 •kobiri.app/kotlinconf2018 •https://play.kotlinlang.org/hands-on/overview •https://github.com/soulesidibe/MultiplatformApp

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Thank you! That’s it