Kotlin Multiplatform. Why and How?

By : Deny Prasetyo (Jasoet), Sr Software Engineer, Gojek
Live : https://youtu.be/cQIS9u8ur_Y?t=830

Transcript

1. Kotlin Multiplatform Why and How? Deny Prasetyo @Jasoet http://images.yalantis.com/uploads/article/image/108/Kotlin.jpg
2. @Jasoet > Deny Prasetyo • 10+ years experience as a engineer and trainer. • Kotlin, Go, and Cloud Native Technology Enthusiast • Cloud Automation Tech Lead, Infrastructure Engineering, Gopay Indonesia • Kotlin Indonesia organizer
3. Why Kotlin?
4. What is Not? ➔ Not a Java Killer! ➔ Not a new Platform! Just a Language! @Jasoet
5. 100% Java compatible @Jasoet Very Mature Platform ➔ Java frameworks ➔ Java Tools ➔ Community ➔ Ecosystem
6. Learning Curve @Jasoet ➔ Modern Language ➔ Statically-typed. Object-oriented/Functional Paradigm. ➔ Kotlin allowing us to write concise and expressive code
7. Modern Language ➔ Null Safety ◆ Null are part of type system ➔ Mutability Protection ◆ Mutability notation is a requirement. ◆ You must choose val or var. ➔ The Magical Fun ◆ Normal Function ◆ Higher order function and Lambda ◆ Inline fun ◆ Function Literal with Receiver ◆ Extension Function (Kotlin’s white Magic) ➔ Class and Object ◆ Class @Jasoet ◆ Inheritance ◆ Data Class ◆ Object Notation (the real form) ◆ Companion Object ◆ Sealed Class ◆ Destructuring ◆ Enum Class ➔ Safety Belt ◆ `is` operator ◆ Smart Cast ◆ Unchecked Exception (No more “Exception Driven Programming”) ◆ Type Alias ➔ Coroutine
8. Null Safety @Jasoet
9. Data Class and Destructuring @Jasoet
10. Static Typing + Smart Cast Java Kotlin @Jasoet
11. Coroutine
12. Using Kotlin Coroutine
13. Features • Regular Loops • Regular Exception Handling • Regular High Level Operator ◦ let, apply, forEach, filter, map, use, etc
14. They all support Kotlin! • Spring Boot (https://start.spring.io/) • Eclipse Vertx (https://vertx.io/) • JetBrains Ktor (https://ktor.io) • Quarkus (https://quarkus.io/) • Micronaut (https://micronaut.io/) • Oracle Helidon (https://helidon.io)
16. Best language for Android Development • https://developer.android.com/kotlin • https://kotlinlang.org/docs/android-overview.html
17. Best language tool support
18. Why stop here?
19. Kotlin/JS Compiles to JavaScript • On Browser • On Node.js • Interoperability • Flexible
20. Kotlin/Native Kotlin as LLVM language frontend • Compile to Native • Interoperability with C and Objective-C • Flexible • Garbage Collector • Support Multiple Target Platform https://kotlinlang.org/docs/mpp-supported-platforms.html
21. Kotlin Multiplatform
22. How its works? • Language, and platform-specific libraries and tools • Common code ◦ language, core libraries, and basic tools. Works everywhere on all platforms ◦ Ktor, Koin • Interoperability ◦ Access platform specific code and leverage all capabilities ◦ Natively integrated. Smooth interop. • Code sharing ◦ Optional sharing. Low risk. No big decisions. ◦ Code sharing, not cross-platform
23. Code Sharing
24. Expect and Actual
25. Expect and Actual
26. Compilation
27. Gradle support https://kotlinlang.org/docs/mpp-dsl-reference.html
28. IDE Support https://kotlinlang.org/docs/mobile/home.html
30. @Jasoet (Telegram, Twitter, Fb, Ig, etc…) https://github.com/jasoet