Adding fun to API development with Kotlin

Kotlin is much more than just a language for making Android apps; it is a complete ecosystem that also supports API development. In addition to supporting JVM and JS frameworks, Kotlin offers powerful features that make API development fun and enjoyable.

Imagine having a compiler that helps you avoid null pointer exceptions. Kotlin makes this possible and more. During this session, we'll explore some of the best Kotlin features and use them to develop APIs for JS, JVM, and native runtimes.

By the end of this presentation, Kotlin will elevate your Developer Experience (DX) to the next level.

Transcript

1. Adding fun to API development with Kotlin Paris API Days 04/12/2024 - 1
5. Yassine Benabbas DevRel @ Worldline, Teacher Lille Android User Group @yostane in/benabbasyassine - 5 @yostane.bsky.social
6. Agenda 6 Language KMP Backend frameworks
7. Language 7
8. Idiomatic Kotlin • Coding with a style that uses the features of the language • For ex. : getter and setter functions in classes is not Kotlin idiomatic 8 https://wrl.li/kt-nb-ad24
9. • https://www.youtube.com/watch?list=PLlFc5cFwUnmwHaD3- qeoLHnho_PY2g9JX - 9
10. Kotlin Multiplatform (KMP) 10
11. KMP: principle 11 Compiler backend Kotlin/ JVM Kotlin/ JS Kotlin/ Native Kotlin/ Wasm iOS Desktop Browser Android Backend Data science Compiler frontend Tools Libraries Program.kt
12. 12 So, Kotlin has a fullstack compiler
13. Compiler backend Kotlin/ JVM Kotlin/ JS Kotlin/ Native Kotlin/ Wasm iOS Desktop Browser Android Backend Data science Compiler frontend Tools Libraries 13 Code that depends on the JVM
14. Compiler backend Kotlin/ JVM Kotlin/ JS Kotlin/ Native Kotlin/ Wasm iOS Desktop Browser Android Backend Data science Compiler frontend Tools Libraries 14 Code that depends on the JVM
15. Compiler backend Kotlin/ JVM Kotlin/ JS Kotlin/ Native Kotlin/ Wasm iOS Desktop Browser Android Backend Data science Compiler frontend Outillage Librairies 15 Multiplatform code
16. Backend frameworks 16
17. 17 Kotlin was originally developed for Android Backend
18. 18 Kotlin was originally developed for Backend
19. Many choices JVM Pure Kotlin Kotlin/JS - WASM Examples 19
20. DSL restassured - 20
21. ExpressJS In Kotlin - 21
22. Ktor server By JetBrains • Free and OpenSource • Relies on DSLs • Plugins: • Rest APIs • Websockets • RPC • And a lot more - 22
23. - 23 https://wrl.li/ktorserverdemo
24. Ktor RPC (Remote Procedure Call) 24 RPC service
25. Ktor RPC (Remote Procedure Call) 25 RPC service Calling the RPC
26. Case studies https://kotlinlang.org/lp/server-side/case-studies 26
27. Conclusion 30
28. Kotlin in 2024 Back Data science Front Infra, Scripting, Gradle, … 31
29. Kotlin in 2024 Back Data science Front Infra, Scripting, Gradle, … 32 Kotlin foundation
30. • Many choices: Ktor, Spring, Quarkus, NodeJS, … • Notebooks and scripting support • Fullstack cross-platform • Interoperable with Java and JS ecosystems • Language: concise, modern and fun 33 Kotlin API dev
31. Kotlin training KMP training Thank you Any questions? 34 Slides
32. - 35 blog.worldline.tech youtube.com/@TechAtWorldline