Kotlin All The Things - 2020 edition

Transcript

1. Kotlin All The Things Michael Yotive @myotive Big Nerd Ranch
3. Who am I?
10. Why All The Things? Kotlin All The Things • Save time/money ◦ Caution: Big investment • Sharing code within/across company • Increased Quality • Feature teams
11. • Kotlin on the Server • Client Side Kotlin • Kotlin/Native • Kotlin Multiplatform Kotlin All The Things Agenda
12. Kotlin on the Server (JVM)
13. Kotlin on the Server Backend • Read dynamic data • Authenticate • Write/Persist data Kotlin All The Things
14. 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
15. Kotlin on the Server Kotlin All The Things KotlinConf 2018 - Komparing Kotlin Server Frameworks by Ken Yee https://www.youtube.com/watch?v=8xfQA10Cd7g
16. Spring and Spring Boot Kotlin All The Things
17. Spring and Spring Boot Kotlin All The Things
18. 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
19. Spring and Spring Boot Kotlin All The Things
20. SpringInitializr Kotlin All The Things https://start.spring.io
21. Sample Kotlin All The Things @SpringBootApplication class DemoApplication fun main(args: Array<String>) { runApplication<DemoApplication>(*args) } @RestController class HelloWorldController{ @GetMapping("/") fun helloWorld() = "Hello World!" }
22. Sample Kotlin All The Things @SpringBootApplication class DemoApplication fun main(args: Array<String>) { runApplication<DemoApplication>(*args) } @RestController class HelloWorldController{ @GetMapping("/") fun helloWorld() = "Hello World!" }
23. Sample Kotlin All The Things @SpringBootApplication class DemoApplication fun main(args: Array<String>) { runApplication<DemoApplication>(*args) } @RestController class HelloWorldController{ @GetMapping("/") fun helloWorld() = "Hello World!" }
24. Sample Kotlin All The Things @SpringBootApplication class DemoApplication fun main(args: Array<String>) { runApplication<DemoApplication>(*args) } @RestController class HelloWorldController{ @GetMapping("/") fun helloWorld() = "Hello World!" }
25. Sample Kotlin All The Things @SpringBootApplication class DemoApplication fun main(args: Array<String>) { runApplication<DemoApplication>(*args) } @RestController class HelloWorldController{ @GetMapping("/") fun helloWorld() = "Hello World!" }
26. Sample Kotlin All The Things data class SimpleObject(val data:String = "Sample") @RestController class HelloWorldController{ @GetMapping("/Sample") fun sample() = (1 .. 10).map { SimpleObject() } }
27. Sample Kotlin All The Things data class SimpleObject(val data:String = "Sample") @RestController class HelloWorldController{ @GetMapping("/Sample") fun sample() = (1 .. 10).map { SimpleObject() } }
28. Sample Kotlin All The Things data class SimpleObject(val data:String = "Sample") @RestController class HelloWorldController{ @GetMapping("/Sample") fun sample() = (1 .. 10).map { SimpleObject() } }
29. KTor Kotlin All The Things https://ktor.io/
30. 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/
31. KTor Kotlin All The Things const val defaultPort = 8080 fun main() { embeddedServer(Netty, defaultPort, module = Application::main) .start(wait = true) }
32. KTor Kotlin All The Things const val defaultPort = 8080 fun main() { embeddedServer(Netty, defaultPort, module = Application::main) .start(wait = true) }
33. KTor Kotlin All The Things const val defaultPort = 8080 fun main() { embeddedServer(Netty, defaultPort, module = Application::main) .start(wait = true) }
34. KTor Kotlin All The Things fun Application.main(){ install(DefaultHeaders){ header("Access-Control-Allow-Origin", "*") } install(ContentNegotiation) { gson { setDateFormat(DateFormat.LONG) setPrettyPrinting() } } installRoutes() }
35. KTor Kotlin All The Things fun Application.main(){ install(DefaultHeaders){ header("Access-Control-Allow-Origin", "*") } install(ContentNegotiation) { gson { setDateFormat(DateFormat.LONG) setPrettyPrinting() } } installRoutes() }
36. KTor Kotlin All The Things fun Application.main(){ install(DefaultHeaders){ header("Access-Control-Allow-Origin", "*") } install(ContentNegotiation) { gson { setDateFormat(DateFormat.LONG) setPrettyPrinting() } } installRoutes() }
37. KTor Kotlin All The Things fun Application.installRoutes() { routing { get("/") { ... } get("/sessions") { ... } get("/sessions/{id}") { ... } } }
38. KTor Kotlin All The Things get("/") { call.respondHtml { head { title("Ping") } body { h1 { +"The API is up." } } } } https://github.com/Kotlin/kotlinx.html
39. KTor Kotlin All The Things get("/") { call.respondHtml { head { title("Ping") } body { h1 { +"The API is up." } } } } https://github.com/Kotlin/kotlinx.html
40. KTor Kotlin All The Things get("/sessions") { val sessions:List<Session> = SessionDB.sessionRepository.all() call.respond(sessions) }
41. KTor Kotlin All The Things get("/sessions") { val sessions = SessionDB.sessionRepository.all() call.respond(sessions) }
42. 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) }
43. 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) }
44. KTor Kotlin All The Things data class HelloWorld(val hello: String) post("/route") { val helloWorld = call.receive<HelloWorld>() }
45. KTor Kotlin All The Things
46. Client Side Kotlin (Kotlin/JS)
48. https://insights.stackoverflow.com/survey/2020/
49. https://insights.stackoverflow.com/survey/2019/
50. https://insights.stackoverflow.com/survey/2018/
51. https://insights.stackoverflow.com/survey/2020/
52. https://insights.stackoverflow.com/survey/2020/
53. https://insights.stackoverflow.com/survey/2019/ !!!!
54. https://insights.stackoverflow.com/survey/2018/ !!!!
55. var x = 12345; x = "string"; var x = 12345; x = "string"; x = { key: "value" }; Dynamically Typed Statically Typed
57. • 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
58. 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
59. fun main(args: Array<String>) { println("Hello JavaScript!") } kotlinc-js helloworld.kt -output helloworld.js File: helloworld.kt
60. var HelloJS = function (_, Kotlin) { 'use strict'; var println = Kotlin.kotlin.io.println_s8jyv4$; function main(args) { println('Hello JavaScript!'); } _.main_kand9s$ = main; main([]); Kotlin.defineModule('HelloJS', _); return _; }(typeof HelloJS === 'undefined' ? {} : HelloJS, kotlin);
61. var HelloJS = function (_, Kotlin) { 'use strict'; var println = Kotlin.kotlin.io.println_s8jyv4$; function main(args) { println('Hello JavaScript!'); } _.main_kand9s$ = main; main([]); Kotlin.defineModule('HelloJS', _); return _; }(typeof HelloJS === 'undefined' ? {} : HelloJS, kotlin);
62. var HelloJS = function (_, Kotlin) { 'use strict'; var println = Kotlin.kotlin.io.println_s8jyv4$; function main(args) { println('Hello JavaScript!'); } _.main_kand9s$ = main; main([]); Kotlin.defineModule('HelloJS', _); return _; }(typeof HelloJS === 'undefined' ? {} : HelloJS, kotlin); OutputToConsoleLog.prototype.println_s8jyv4$ = function (message) { console.log(message); };
63. <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Hello Kotlin/JS</title> </head> <body> <script type="text/javascript" src="helloworld.js"></script> </body> </html>
64. <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Hello Kotlin/JS</title> </head> <body> <script type="text/javascript" src="helloworld.js"></script> </body> </html>
65. fun main(args: Array<String>) { println("Hello JavaScript!") } kotlinc-js Module: HelloJS File: main.kt
66. <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Hello Kotlin/JS</title> </head> <body> <script type="text/javascript" src="out/production/HelloJS/lib/kotlin.js"></script> <script type="text/javascript" src="out/production/HelloJS/HelloJS.js"></script> </body> </html>
67. <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Hello Kotlin/JS</title> </head> <body> <script type="text/javascript" src="out/production/HelloJS/lib/kotlin.js"></script> <script type="text/javascript" src="out/production/HelloJS/HelloJS.js"></script> </body> </html>
68. Calling JavaScript from Kotlin Kotlin All The Things Javascript ⬌ Kotlin fun main(args: Array<String>) { js("console.log('Hello World')") }
69. Calling JavaScript from Kotlin Kotlin All The Things Javascript ⬌ Kotlin fun main(args: Array<String>) { js("console.log('Hello World')") }
70. Calling JavaScript from Kotlin Kotlin All The Things Javascript ⬌ Kotlin external fun alert(message: Any?): Unit fun main(args: Array<String>) { alert("All The Things!") }
71. Calling JavaScript from Kotlin Kotlin All The Things Javascript ⬌ Kotlin external fun alert(message: Any?): Unit fun main(args: Array<String>) { alert("All The Things!") }
72. Calling JavaScript from Kotlin Kotlin All The Things Javascript ⬌ Kotlin import org.w3c.dom.Window external val window: Window fun main(args: Array<String>) { window.document.location?.href ="https://www.google.com" }
73. 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()
74. Calling Kotlin from JavaScript Kotlin All The Things Javascript ⬌ Kotlin Kotlin Module: myModule fun foo() = "Hello" JavaScript alert(myModule.foo());
75. 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());
76. 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!") }
77. 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!") }
78. 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!") }
79. 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");
80. Kotlin All The Things JavaScript Modules compileKotlin2Js.kotlinOptions.moduleKind = ‘<module kind>’ • Plain • AMD - used by Require.js • CommonJS - used by Node.js/NPM • UMD - supports both AMD and CommonJS
81. Kotlin All The Things Kotlin/JS Tooling apply plugin: 'org.jetbrains.kotlin.js'
82. Kotlin All The Things Kotlin/JS Tooling apply plugin: 'org.jetbrains.kotlin.js' kotlin { target { nodejs() browser() } }
83. 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")) } }
84. Kotlin All The Things Kotlin/JS + React David Ford - Talking Kotlin http://talkingkotlin.com/react-with-kotlin/
85. Kotlin All The Things Kotlin/JS + React JavaScript class ShoppingList extends React.Component { render() { return ( <div className="shopping-list"> <h1>Shopping List for {this.props.name}</h1> <ul> <li>Instagram</li> <li>WhatsApp</li> <li>Oculus</li> </ul> </div> ); } }
86. Kotlin All The Things Kotlin/JS + React JavaScript class ShoppingList extends React.Component { render() { return ( <div className="shopping-list"> <h1>Shopping List for {this.props.name}</h1> <ul> <li>Instagram</li> <li>WhatsApp</li> <li>Oculus</li> </ul> </div> ); } } HTML <ShoppingList name="Mark" />
87. Kotlin All The Things Kotlin/JS + React JavaScript class ShoppingList extends React.Component { render() { return ( <div className="shopping-list"> <h1>Shopping List for {this.props.name}</h1> <ul> <li>Instagram</li> <li>WhatsApp</li> <li>Oculus</li> </ul> </div> ); } }
88. Kotlin All The Things Kotlin/JS + React Kotlin class ShoppingList : ReactDOMComponent<ShoppingList.Props, ShoppingList.State>(){ override fun ReactDOMBuilder.render() { div(classes = "shopping-list") { h1 { +"Shopping List for ${props.name}" } ul{ li{ + "Instagram" } li{ + "WhatsApp" } li{ + "Oculus" } } } } }
89. Kotlin All The Things Kotlin/JS + React Kotlin class ShoppingList : ReactDOMComponent<ShoppingList.Props, ShoppingList.State>(){ override fun ReactDOMBuilder.render() { div(classes = "shopping-list") { h1 { +"Shopping List for ${props.name}" } ul{ li{ + "Instagram" } li{ + "WhatsApp" } li{ + "Oculus" } } } } }
90. 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
91. 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
92. Kotlin/Native
93. • 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
94. Kotlin Native Kotlin All The Things Source KONANC LLVM Native Binary LLVM IR Front End Back End
95. 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
96. 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
97. 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
98. Kotlin Native Kotlin All The Things package sample fun hello(): String = "Hello, Kotlin/Native!" fun main() { println(hello()) }
99. Kotlin Native Kotlin All The Things package sample fun hello(): String = "Hello, Kotlin/Native!" fun main() { println(hello()) } konanc MySample.kt -e sample.main
100. Kotlin Native Kotlin All The Things package sample fun hello(): String = "Hello, Kotlin/Native!" fun main() { println(hello()) } konanc MySample.kt -e sample.main
101. Kotlin Native Kotlin All The Things https://kotlinlang.org/docs/reference/native/platform_libs.html import platform.GLUT.* import platform.OpenGL.* import platform.OpenGLCommon.*
102. 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() }
103. 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() }
104. 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) ... }
105. 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) ... }
106. Kotlin Native Kotlin All The Things konanc MySample.kt -e sample.main -produce framework -target <ios_x64 | ios_arm64> -output <directory> https://kotlinlang.org/docs/tutorials/native/apple-framework.html
107. Kotlin Native Kotlin All The Things konanc MySample.kt -e sample.main -produce framework -target <ios_x64 | ios_arm64> -output <directory> https://kotlinlang.org/docs/tutorials/native/apple-framework.html
108. #import <Foundation/Foundation.h> @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; ...
109. #import <Foundation/Foundation.h> @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; ...
110. Kotlin Multiplatform
113. • 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
114. • Data Models • Validation Rules • Network Client Code • HTML Generation What to share? Kotlin All The Things
115. • UI • Rx anything • Threading • Database? What not to share? Kotlin All The Things
116. Kotlin Multiplatform Kotlin All The Things https://kotlinlang.org/docs/reference/building-mpp-with-gradle.html
117. Kotlin Multiplatform Kotlin All The Things https://kotlinlang.org/docs/reference/building-mpp-with-gradle.html
118. Kotlin Multiplatform Kotlin All The Things https://kotlinlang.org/docs/reference/building-mpp-with-gradle.html
119. Kotlin Multiplatform Kotlin All The Things https://kotlinlang.org/docs/reference/building-mpp-with-gradle.html
120. Kotlin Multiplatform Kotlin All The Things https://kotlinlang.org/docs/reference/building-mpp-with-gradle.html plugins { id 'kotlin-multiplatform' version '1.3.72' }
121. 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 { ... } }
122. 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 {} } }
123. 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 {} } }
124. 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 {} } }
125. 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 {} } }
126. 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 {} } }
127. 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 {} } }
128. Kotlin Multiplatform Kotlin All The Things https://kotlinlang.org/docs/reference/building-mpp-with-gradle.html
129. Kotlin Multiplatform Kotlin All The Things https://kotlinlang.org/docs/reference/building-mpp-with-gradle.html
130. Kotlin Multiplatform Kotlin All The Things https://kotlinlang.org/docs/reference/building-mpp-with-gradle.html
131. Kotlin Multiplatform Kotlin All The Things https://kotlinlang.org/docs/reference/building-mpp-with-gradle.html
132. 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 } }
133. Kotlin Multiplatform Kotlin All The Things https://github.com/JetBrains/kotlin-mpp-example/ class Greeting { fun greeting(): String = "Hello, ${Platform().platform}" }
134. Kotlin Multiplatform Kotlin All The Things https://github.com/JetBrains/kotlin-mpp-example/ class Greeting { fun greeting(): String = "Hello, ${Platform().platform}" }
135. 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}" }
136. 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" }
137. Kotlin Multiplatform Kotlin All The Things https://github.com/JetBrains/kotlin-mpp-example/
138. 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
139. 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
140. 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.
141. Kotlin Multiplatform In Production
142. Who is using KMP in Production? Kotlin All The Things https://tech.target.com/2019/04/02/gift-registry-kotlin-multiplatform.html
143. Who is using KMP in Production? Kotlin All The Things https://developer.squareup.com/blog/developing-on-ios-and-android/
144. Who is using KMP in Production? Kotlin All The Things
145. Who is using KMP in Production? Kotlin All The Things
146. Who is using KMP in Production? Kotlin All The Things https://touchlab.co/
147. Misc
148. 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
149. Conclusion
150. • 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.
151. • 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
152. Thank you! Let’s Build Brilliance www.bignerdranch.com 200 Arizona Ave NE, Suite 200, Atlanta, GA 30307 myotive@bignerdranch.com @myotive