Kotlin everywhere: share your kotlin code across platforms
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Kotlin can be used to build desktop apps with TornadoFX, iOS and Android apps with Kotlin Native, web apps targeting JavaScript or JVM with common code shared across platforms, and Node.js backend apps with Kotlin wrapping JavaScript libraries and providing type safety. Kotlin also supports dynamic types and external declarations to integrate with existing JavaScript code.
Kotlin everywhere: share your kotlin code across platforms
- 2. Who’s speaking Rob @ NYT Boris @ ClearScore 2
- 5. Desktop apps with a little bit of Tornado™
- 6. ● JavaFX ● Beautiful DSL ● UI + Background thread ● Injection ● REST ● Field validation ● Can work™ with JS TornadoFX 6
- 8. iOS apps and Android (but we wanted the WOW moment)
- 9. Kotlin Native COMMON no platform specific dependencies class/function declaration 9 PLATFORM implementations of platform-dependent declarations in the common module always an implementation of a single common module REGULAR targets specific platform can be dependency of platform modules can depend on platform modules
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- 11. ◇ common module defines expected declarations ◇ expected declarations never contain any implementation code 11 expected
- 12. 12 actual ◇ platform module provides actual declarations ◇ actual declarations must match expected declarations
- 13. 13 package org.jetbrains.foo expect class Foo(bar: String) { fun frob() } fun main(args: Array<String>) { Foo("Hello").frob() }
- 14. 14 package org.jetbrains.foo actual class Foo actual constructor(val bar: String) { actual fun frob() { println("Frobbing the $bar") } }
- 15. JVM Backend
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- 17. Javascript Both Frontend and Backend!
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- 20. ◇ You can set and call everything you want on properties of this type ◇ Disables compiler checks (beware of runtime errors) 20 dynamic
- 21. ◇ Kotlin assumes the implementation is provided by the developer (in JS) ◇ The compiler will not generate JS code for this function ◇ No auto completion 21 external
- 22. 22 external fun require(module: String): dynamic fun main(args: Array<String>) { val app = require(“express”) app.get(“/hello”, {req, res -> res.send(“Hello world!”) }) }
- 24. 24 @JsModule(“express”) external class Express { fun get( route: String, callback: (req: Request, res: Response) -> Unit ) external class Request external class Response { fun send(data: String) } }
- 26. Thanks! Any questions? You can find us at: ◇ @_tiwiz ◇ @borisdamato 26