Kotlin Multiplatform 

Kotlin Kotlin/JVM Kotlin/Native Kotlin/JS Kotlin Multiplatform Easter Egg 

Kotlin Kotlin/JVM Kotlin/Native Kotlin/JS Kotlin Multiplatform Easter Egg 

Warning: The next slides are not 100% accurate but give you a visualisation about how Kotlin Multiplatform works 

Fact: Kotlin is a Programming language. 

Fact: Each language has to converted to something which can be understand by "a computer". We call these converters compiler. 

Fact: Jetbrains provides different compilers for one language. 

Fact: Jetbrains provides different compilers for one language. 1. JVM 2. Native 3. JS 

Fact: Kotlin can be converted to Java Bytecode (via JVM compiler) Machine code (via Native compiler) JavaScript (via JS compiler) 

fun main() { println("HelloWorld") } Example $ kotlinc HelloWorld.kt -include-runtime -d hello.jar $ java -jar hello.jar HelloWorld $ konanc HelloWorld.kt -o hello $ ./hello.kexe HelloWorld $ kotlinc-js HelloWorld.kt -output hello.js $ cat hello.js // JS Code nobody wants to see 

Please note that we talk about pure Kotlin code. No dependencies to other worlds (like JVM, C or JS). 

But - because the compiler knows about other worlds it is possible to use the respective dependencies! 

Example expect currentTime: Long fun printTime() { println("It is $currentTime o'clock") } common.kt // No dependencies to other worlds actual currentTime: Long = java.lang.System.currentTimeMillis() fun main() = printTime() jvm.kt actual currentTime: Long = platform.posix.time(null) fun main() = printTime() native.kt actual currentTime: Long = kotlin.js.Date.now() fun main() = printTime() js.kt 

Now we can compile each target (jvm, native, js) with the respective compiler 

Questions so far?