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Kotlin All The Things Michael Yotive @myotive Big Nerd Ranch

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Who am I?

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Why All The Things? Kotlin All The Things ● Save time/money ○ Caution: Big investment ● Sharing code within/across company ● Increased Quality ● Feature teams

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● Kotlin on the Server ● Client Side Kotlin ● Kotlin/Native ● Kotlin Multiplatform Kotlin All The Things Agenda

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Kotlin on the Server (JVM)

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Kotlin on the Server Backend ● Read dynamic data ● Authenticate ● Write/Persist data Kotlin All The Things

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Kotlin on the Server Why Kotlin? ● Great Modern language ○ Higher order functions ○ Extension functions ○ Type Safety ○ Coroutines ● Allows you to stay on Java 8 Kotlin All The Things

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Kotlin on the Server Kotlin All The Things KotlinConf 2018 - Komparing Kotlin Server Frameworks by Ken Yee https://www.youtube.com/watch?v=8xfQA10Cd7g

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Spring and Spring Boot Kotlin All The Things

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Spring and Spring Boot Kotlin All The Things

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Spring and Spring Boot Kotlin All The Things What is Spring Boot? ● Another project built of top of Spring. ● Main goals: ○ Decrease friction by taking an opinionated approach to building applications ○ Reduce conﬁgurations ○ Streamline deployment approach

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Spring and Spring Boot Kotlin All The Things

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SpringInitializr Kotlin All The Things https://start.spring.io

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Sample Kotlin All The Things @SpringBootApplication class DemoApplication fun main(args: Array) { runApplication(*args) } @RestController class HelloWorldController{ @GetMapping("/") fun helloWorld() = "Hello World!" }

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Sample Kotlin All The Things data class SimpleObject(val data:String = "Sample") @RestController class HelloWorldController{ @GetMapping("/Sample") fun sample() = (1 .. 10).map { SimpleObject() } }

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Sample Kotlin All The Things data class SimpleObject(val data:String = "Sample") @RestController class HelloWorldController{ @GetMapping("/Sample") fun sample() = (1 .. 10).map { SimpleObject() } }

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Sample Kotlin All The Things data class SimpleObject(val data:String = "Sample") @RestController class HelloWorldController{ @GetMapping("/Sample") fun sample() = (1 .. 10).map { SimpleObject() } }

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KTor Kotlin All The Things https://ktor.io/

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KTor Kotlin All The Things ● Can be hosted on any Servlet 3.0+ API (such as TomCat) ○ Supports standalone Netty and Jetty, too. ● Includes a cross-platform HTTP Client that includes: ○ Authentication (includes OAuth 1a and 2) ○ Cookies ○ WebSockets ○ JSON Processing https://ktor.io/

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KTor Kotlin All The Things const val defaultPort = 8080 fun main() { embeddedServer(Netty, defaultPort, module = Application::main) .start(wait = true) }

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KTor Kotlin All The Things const val defaultPort = 8080 fun main() { embeddedServer(Netty, defaultPort, module = Application::main) .start(wait = true) }

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KTor Kotlin All The Things const val defaultPort = 8080 fun main() { embeddedServer(Netty, defaultPort, module = Application::main) .start(wait = true) }

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KTor Kotlin All The Things fun Application.main(){ install(DefaultHeaders){ header("Access-Control-Allow-Origin", "*") } install(ContentNegotiation) { gson { setDateFormat(DateFormat.LONG) setPrettyPrinting() } } installRoutes() }

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KTor Kotlin All The Things fun Application.installRoutes() { routing { get("/") { ... } get("/sessions") { ... } get("/sessions/{id}") { ... } } }

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KTor Kotlin All The Things get("/") { call.respondHtml { head { title("Ping") } body { h1 { +"The API is up." } } } } https://github.com/Kotlin/kotlinx.html

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KTor Kotlin All The Things get("/") { call.respondHtml { head { title("Ping") } body { h1 { +"The API is up." } } } } https://github.com/Kotlin/kotlinx.html

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KTor Kotlin All The Things get("/sessions") { val sessions:List = SessionDB.sessionRepository.all() call.respond(sessions) }

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KTor Kotlin All The Things get("/sessions") { val sessions = SessionDB.sessionRepository.all() call.respond(sessions) }

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KTor Kotlin All The Things get("/sessions/{id}") { val sessionId = call.parameters["id"] val data:Session = SessionDB.sessionRepository.find(Session::id eq sessionId) .firstOrDefault() call.respond(data) }

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KTor Kotlin All The Things get("/sessions/{id}") { val sessionId = call.parameters["id"] val data = SessionDB.sessionRepository.find(Session::id eq sessionId) .firstOrDefault() call.respond(data) }

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KTor Kotlin All The Things data class HelloWorld(val hello: String) post("/route") { val helloWorld = call.receive() }

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KTor Kotlin All The Things

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Client Side Kotlin (Kotlin/JS)

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https://insights.stackoverﬂow.com/survey/2020/

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https://insights.stackoverﬂow.com/survey/2019/

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https://insights.stackoverﬂow.com/survey/2018/

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https://insights.stackoverﬂow.com/survey/2020/

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https://insights.stackoverﬂow.com/survey/2020/

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https://insights.stackoverﬂow.com/survey/2019/ !!!!

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https://insights.stackoverﬂow.com/survey/2018/ !!!!

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var x = 12345; x = "string"; var x = 12345; x = "string"; x = { key: "value" }; Dynamically Typed Statically Typed

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● kotlinc-js ○ Available for use since Kotlin 1.1 ○ Validate and transpile Kotlin code to Javascript ● Targets ECMAScript 5.1 ○ Plans in the work to support ECMAScript 2015 Kotlin/JS Kotlin All The Things

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Goals ● Output readable Javascript. ● Produce Javascript that is optimal in size. ● Optional interoperability with existing module systems: ○ CommonJS (NodeJS) ○ AMD (RequireJS) ○ UMD Kotlin/JS Kotlin All The Things

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fun main(args: Array) { println("Hello JavaScript!") } kotlinc-js helloworld.kt -output helloworld.js File: helloworld.kt

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Hello Kotlin/JS

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Hello Kotlin/JS

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fun main(args: Array) { println("Hello JavaScript!") } kotlinc-js Module: HelloJS File: main.kt

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Hello Kotlin/JS

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Hello Kotlin/JS

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Calling JavaScript from Kotlin Kotlin All The Things Javascript ⬌ Kotlin fun main(args: Array) { js("console.log('Hello World')") }

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Calling JavaScript from Kotlin Kotlin All The Things Javascript ⬌ Kotlin fun main(args: Array) { js("console.log('Hello World')") }

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Calling JavaScript from Kotlin Kotlin All The Things Javascript ⬌ Kotlin external fun alert(message: Any?): Unit fun main(args: Array) { alert("All The Things!") }

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Calling JavaScript from Kotlin Kotlin All The Things Javascript ⬌ Kotlin external fun alert(message: Any?): Unit fun main(args: Array) { alert("All The Things!") }

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Calling JavaScript from Kotlin Kotlin All The Things Javascript ⬌ Kotlin import org.w3c.dom.Window external val window: Window fun main(args: Array) { window.document.location?.href ="https://www.google.com" }

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Calling JavaScript from Kotlin Kotlin All The Things Javascript ⬌ Kotlin https://kotlinlang.org/docs/reference/dynamic-type.html The Dynamic Type val dyn: dynamic = null dyn.foo().bar.baz()

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Calling Kotlin from JavaScript Kotlin All The Things Javascript ⬌ Kotlin Kotlin Module: myModule fun foo() = "Hello" JavaScript alert(myModule.foo());

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Calling Kotlin from JavaScript Kotlin All The Things Javascript ⬌ Kotlin Kotlin Module: myModule package my.qualified.packagename fun foo() = "Hello" JavaScript alert(myModule.my.qualified.packagename.foo());

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Calling Kotlin from JavaScript Kotlin All The Things Javascript ⬌ Kotlin Kotlin Module: myModule class Person(val name: String) { fun hello() = println("Hello $name!") fun hello(greeting: String) = println("$greeting $name!") }

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Calling Kotlin from JavaScript Kotlin All The Things Javascript ⬌ Kotlin Kotlin Module: myModule class Person(val name: String) { fun hello() = println("Hello $name!") @JsName("helloWithGreeting") fun hello(greeting: String) = println("$greeting $name!") } JavaScript var person = new myModule.Person("Dmitry"); myModule.hello(); myModule.helloWithGreeting("Servus");

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Kotlin All The Things JavaScript Modules compileKotlin2Js.kotlinOptions.moduleKind = ‘’ ● Plain ● AMD - used by Require.js ● CommonJS - used by Node.js/NPM ● UMD - supports both AMD and CommonJS

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Kotlin All The Things Kotlin/JS Tooling apply plugin: 'org.jetbrains.kotlin.js'

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Kotlin All The Things Kotlin/JS Tooling apply plugin: 'org.jetbrains.kotlin.js' kotlin { target { nodejs() browser() } }

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Kotlin All The Things Kotlin/JS Tooling apply plugin: 'org.jetbrains.kotlin.js' kotlin { target { nodejs() } sourceSets["main"].dependencies { implementation(kotlin("stdlib-js")) implementation(npm("react", "16.8.3")) } }

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Kotlin All The Things Kotlin/JS + React David Ford - Talking Kotlin http://talkingkotlin.com/react-with-kotlin/

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Kotlin All The Things Kotlin/JS + React JavaScript class ShoppingList extends React.Component { render() { return (

Shopping List for {this.props.name}

Instagram
WhatsApp
Oculus

); } }

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Kotlin All The Things Kotlin/JS + React JavaScript class ShoppingList extends React.Component { render() { return (

Shopping List for {this.props.name}

Instagram
WhatsApp
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); } } HTML

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Kotlin All The Things Kotlin/JS + React JavaScript class ShoppingList extends React.Component { render() { return (

Shopping List for {this.props.name}

Instagram
WhatsApp
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); } }

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Kotlin All The Things Kotlin/JS + React Kotlin class ShoppingList : ReactDOMComponent(){ override fun ReactDOMBuilder.render() { div(classes = "shopping-list") { h1 { +"Shopping List for ${props.name}" } ul{ li{ + "Instagram" } li{ + "WhatsApp" } li{ + "Oculus" } } } } }

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Kotlin All The Things Kotlin/JS + React Create React Kotlin App ● Scaﬀold a kotlin react app ● Based on the “create-react-app” command ● Maintained by JetBrains ○ https://github.com/JetBrains/create-react-kotlin-app

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Kotlin All The Things Kotlin/JS Wrappers https://github.com/JetBrains/kotlin-wrappers ● React ● Redux ● Mocca ● Styled Components (https://www.styled-components.com) https://github.com/Kotlin/js-externals ● jQuery

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Kotlin/Native

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● Compile Kotlin Code to Native Binaries (non-VM world) ● LLVM based backend ● Supports two-way interoperability ○ Executable on multiple platforms ○ Static Library with C headers for C/C++ ○ Use existing static/dynamic libraries ○ Supports Objective-C types ● Produces executables and libraries/frameworks. Kotlin Native Kotlin All The Things

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Kotlin Native Kotlin All The Things Source KONANC LLVM Native Binary LLVM IR Front End Back End

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Supported Platforms ● Android (arm32, arm64) ● Windows (mingw, x86_64) ● Linux (x86_64, arm32, MIPSm, MIPS little endian) ● WebAssembly (wasm32) ● MacOS (x86_64) ● iOS (arm32, arm64, emulator x86_64) Kotlin Native Kotlin All The Things

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Getting Started ● Download Intellij and make sure to update the Kotlin tooling to 1.3+ Or ● Download the compiler: https://github.com/JetBrains/kotlin/releases/tag/v1.3.70 ● Extract and add to your path. Kotlin Native Kotlin All The Things

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Kotlin Native Kotlin All The Things package sample fun hello(): String = "Hello, Kotlin/Native!" fun main() { println(hello()) }

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Kotlin Native Kotlin All The Things package sample fun hello(): String = "Hello, Kotlin/Native!" fun main() { println(hello()) } konanc MySample.kt -e sample.main

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Kotlin Native Kotlin All The Things package sample fun hello(): String = "Hello, Kotlin/Native!" fun main() { println(hello()) } konanc MySample.kt -e sample.main

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Kotlin Native Kotlin All The Things https://kotlinlang.org/docs/reference/native/platform_libs.html import platform.GLUT.* import platform.OpenGL.* import platform.OpenGLCommon.*

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Kotlin Native Kotlin All The Things https://github.com/JetBrains/kotlin-native/tree/master/samples/opengl fun main() { // initialize and run program memScoped { ... } // Display Mode glutInitDisplayMode((GLUT_RGB or GLUT_DOUBLE or GLUT_DEPTH).convert()) // Set window size glutInitWindowSize(windowWidth, windowHeight) // create Window glutCreateWindow("The GLUT Teapot") initialize() // run GLUT mainloop glutMainLoop() }

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Kotlin Native Kotlin All The Things https://github.com/JetBrains/kotlin-native/tree/master/samples/opengl fun initialize() { // select projection matrix glMatrixMode(GL_PROJECTION) // set the viewport glViewport(0, 0, windowWidth, windowHeight) // set matrix mode glMatrixMode(GL_PROJECTION) // reset projection matrix glLoadIdentity() val aspect = windowWidth.toDouble() / windowHeight // set up a perspective projection matrix gluPerspective(45.0, aspect, 1.0, 500.0) // specify which matrix is the current matrix glMatrixMode(GL_MODELVIEW) glShadeModel(GL_SMOOTH) ... }

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Kotlin Native Kotlin All The Things konanc MySample.kt -e sample.main -produce framework -target -output https://kotlinlang.org/docs/tutorials/native/apple-framework.html

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Kotlin Native Kotlin All The Things konanc MySample.kt -e sample.main -produce framework -target -output https://kotlinlang.org/docs/tutorials/native/apple-framework.html

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#import @class DemoKotlinArray; @protocol DemoKotlinIterator; NS_ASSUME_NONNULL_BEGIN @interface KotlinBase : NSObject - (instancetype)init __attribute__((unavailable)); + (instancetype)new __attribute__((unavailable)); + (void)initialize __attribute__((objc_requires_super)); @end; ... __attribute__((objc_subclassing_restricted)) __attribute__((swift_name("MySampleKt"))) @interface DemoMySampleKt : KotlinBase + (void)mainArgs:(DemoKotlinArray *)args __attribute__((swift_name("main(args:)"))); @end; ...

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Kotlin Multiplatform

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● Set of tools to help share app data/domain code natively across platforms ○ Gradle Plugin ○ Compile for multiple “targets” ○ Common + Platform speciﬁc code ■ Expect in common code, Actual in platform code. ● Still experimental ● It’s not meant to share all code Kotlin Multiplatform Kotlin All The Things

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● Data Models ● Validation Rules ● Network Client Code ● HTML Generation What to share? Kotlin All The Things

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● UI ● Rx anything ● Threading ● Database? What not to share? Kotlin All The Things

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Kotlin Multiplatform Kotlin All The Things https://kotlinlang.org/docs/reference/building-mpp-with-gradle.html

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Kotlin Multiplatform Kotlin All The Things https://kotlinlang.org/docs/reference/building-mpp-with-gradle.html

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Kotlin Multiplatform Kotlin All The Things https://kotlinlang.org/docs/reference/building-mpp-with-gradle.html

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Kotlin Multiplatform Kotlin All The Things https://kotlinlang.org/docs/reference/building-mpp-with-gradle.html

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Kotlin Multiplatform Kotlin All The Things https://kotlinlang.org/docs/reference/building-mpp-with-gradle.html plugins { id 'kotlin-multiplatform' version '1.3.72' }

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Kotlin Multiplatform Kotlin All The Things https://kotlinlang.org/docs/reference/building-mpp-with-gradle.html kotlin { jvm() js() { compilations.all { kotlinOptions { moduleKind = "umd" } } } android("android") iosX64("ios") { compilations.main.outputKinds("framework") } sourceSets { ... } }

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Kotlin Multiplatform Kotlin All The Things https://kotlinlang.org/docs/reference/building-mpp-with-gradle.html kotlin { ... sourceSets { commonMain { dependencies { implementation kotlin('stdlib-common') } } commonTest { dependencies { implementation kotlin('test-common') implementation kotlin('test-annotations-common') } } jvmMain { dependencies {...} } jvmTest { dependencies {...} } jsMain { dependencies {...} } jsTest { dependencies {...} } androidMain { dependencies {...} } androidTest { dependencies {...} } iosMain {} iosTest {} } }

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Kotlin Multiplatform Kotlin All The Things https://kotlinlang.org/docs/reference/building-mpp-with-gradle.html

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Kotlin Multiplatform Kotlin All The Things https://kotlinlang.org/docs/reference/building-mpp-with-gradle.html

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Kotlin Multiplatform Kotlin All The Things https://kotlinlang.org/docs/reference/building-mpp-with-gradle.html

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Kotlin Multiplatform Kotlin All The Things https://kotlinlang.org/docs/reference/building-mpp-with-gradle.html

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Kotlin Multiplatform Kotlin All The Things https://github.com/JetBrains/kotlin-mpp-example/ class Calculator { companion object { fun sum(a: Int, b: Int): Int = a + b } }

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Kotlin Multiplatform Kotlin All The Things https://github.com/JetBrains/kotlin-mpp-example/ class Greeting { fun greeting(): String = "Hello, ${Platform().platform}" }

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Kotlin Multiplatform Kotlin All The Things https://github.com/JetBrains/kotlin-mpp-example/ class Greeting { fun greeting(): String = "Hello, ${Platform().platform}" }

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Kotlin Multiplatform Kotlin All The Things https://github.com/JetBrains/kotlin-mpp-example/ > commonMain expect class Platform() { val platform: String } class Greeting { fun greeting(): String = "Hello, ${Platform().platform}" }

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Kotlin Multiplatform Kotlin All The Things https://github.com/JetBrains/kotlin-mpp-example/ > iosMain actual class Platform actual constructor() { actual val platform: String = "iOS" } > androidMain actual class Platform actual constructor() { actual val platform: String = "Android" }

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Kotlin Multiplatform Kotlin All The Things https://github.com/JetBrains/kotlin-mpp-example/

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Kotlin Multiplatform Kotlin All The Things https://github.com/JetBrains/kotlin-mpp-example/ > commonMain expect class Date > jvmMain actual typealias Date = java.util.Date > jsMain actual typealias Date = kotlin.js.Date

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Why Expect/Actual vs Interface? Kotlin All The Things GOTO 2017 • Kotlin - One Language, All Tiers: Developing Multiplatform Projects • Dmitry Jemerov ● Much more ﬂexible ● You can “expect” top level functions and extension functions, too. ● Allows you to reuse existing implementation if needed.

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Kotlin Multiplatform In Production

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Who is using KMP in Production? Kotlin All The Things https://tech.target.com/2019/04/02/gift-registry-kotlin-multiplatform.html

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Who is using KMP in Production? Kotlin All The Things https://developer.squareup.com/blog/developing-on-ios-and-android/

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Who is using KMP in Production? Kotlin All The Things

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Who is using KMP in Production? Kotlin All The Things

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Who is using KMP in Production? Kotlin All The Things https://touchlab.co/

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Misc

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Misc “Things” Kotlin All The Things ● KScript ○ The State of KScript https://medium.com/@mbonnin/may-2020-the-state-of-kotlin-scripting-99cb6cc57db1 ○ Clikt https://ajalt.github.io/clikt/ ● Kotlin Gradle DSL

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Conclusion

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● Kotlin is a modern, pragmatic, industry built language with a great community. ● Kotlin became popular on the JVM, but that’s not the only platform for the language. ● Multiplatform projects enable us to use Kotlin natively everywhere.

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● Docs https://kotlinlang.org/ ● Talking Kotlin http://talkingkotlin.com/ ● Kotlin Slack http://slack.kotlinlang.org/ ● Github https://www.github.com/myotive/kotlin-all-the-things ● Slides https://speakerdeck.com/myotive/kotlin-all-the-things

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Thank you! Let’s Build Brilliance www.bignerdranch.com 200 Arizona Ave NE, Suite 200, Atlanta, GA 30307 [email protected] @myotive