You’ll 💜 Kotlin and not only for Android!

Are you not passionate about server-side development?

For many Android developers, it is challenging to delve into backend or web technologies (too much object-oriented, verbose and/or outdated languages, dynamic typing, etc.). With the evolution of Kotlin, now everything is possible.

The idea of this conference is to show you Kotlin's advances in frontend development through Compose multiplatform (mobile, desktop, and web) and full stack development with KMP.
We will also discuss the perspectives and exciting future of the ecosystem.

Transcript

1. Payments to grow your world You’ll 💜 Kotlin and not only for Android! - 1
2. - 2 Yassine Benabbas DevRel @worldline @yostane linkedin.com/in/benabbasyassine Ibrahim Gharbi DevRel @worldline @__brah linkedin.com/in/Ibrahim.gharbi
3. What can we do with Kotlin today ? - 3
4. Already 13th years 🎂 and a promising future ! Ecosystem milestones Language & Web/Desktop support - Kotlin: JVM + JS targets - Kotlin in Android Studio - KMP beta1 Mobile & Backend in the ecosystem - Coroutines - Ktor client / server 1.0 - Kotlin 1st class on Android - Jetpack compose for Android - Apple platforms interop iOS & Kotlin multiplatform - Jetpack Compose 1.0 - Compose multiplatform 1.0 (Android/Desktop) - Compose multiplatform iOS - Kotlin DSL by Default for New Gradle Builds - K2 - KMP Wizard 2011 2017 2018 2020 2021 2024
5. Kotlin Multiplatform (KMP) - 5
6. - 6 Swift UI Shared UI with Compose Multiplatform UIKit widgets Android views Swing/AWT views WebUI Library with Kotlin Multiplatform iOS specific Logic Android specific Logic Desktop specific Logic Web specific Logic iOS APIs Android APIs Desktop JVM/APIs WEB APIs ? Kotlin Multiplatform (KMP) ?
7. KMP : Architecture (1/3) - 7
8. Keywords: Expect / Actual KMP : Architecture : specific platform code (2/3) specific code (UIKit) specific code (Android SDK) actual fun getPlatform(): String { "Android ${android.os.Build.VERSION.SDK_INT}" } actual fun getPlatform(): String { "iOS ${UIDevice.currentDevice.systemVersion}" } expect fun getPlatform(): String
9. Composants Status Librairies tierces Composables Navigation Ressources/i18n ✅ ✅ ✅ Documentation via Jetpack compose Navigation library multiplatform (2024) Painter-ressource, font, string ressources (2024) ViewModel ✅ View model multiplatform available (2024) KMP : Architecture (3/3) Database ✅ SQLDelight, Realm (NoSQL) Room Database (2024) User preferences ✅ Jetpack datastore-preferences, Multiplatform-Settings, Kstore Network ✅ Jetbrain Ktor Client And also o Injection : Koin o Concurrent prg : kotlinx.coroutines o Business logic components (BLoC) : Decompose
10. Kotlin for Frontend (compose) - 10
11. - 11 Title 8:30 @composable MyComposableView(){ Box( contentAlignment = Alignment.Center, modifier = Modifier.fillMaxWidth().fillMaxHeight() ) { Card( shape = RoundedCornerShape(8.dp), modifier = Modifier.padding(10.dp), ) { Column(horizontalAlignment = Alignment.CenterHorizontally) { Text( text = "Quiz", fontSize = 30.sp, modifier = Modifier.padding(all = 10.dp) ) Text(modifier = Modifier.padding(all = 10.dp), text = "A simple Quiz to discovers KMP, KMM and compose.") Button( modifier = Modifier.padding(all = 10.dp), onClick = { } ) { Text("Start the Quiz")} }} } Start the Quiz Quizz A simple Quizz to discovers KMP, KMM and compose Declarative UI with Compose multiplatform Skia Behind compose multiplatform (https://github.com/JetBrains/skiko)
12. DEMO TIME KMP + compose - 12
13. Kotlin for the backend - 13
14. Many choices JVM Pure Kotlin Kotlin/JS - WASM - 14
15. Case study https://kotlinlang.org/lp/server-side/case-studies - 15
16. Ktor server example - 16 Routes
17. Ktor server Demo - 17
18. Kotlin for the Data science - 18
19. Jupyter Notebook • File (ipynb) that contains markdown and executable code • Can be run from webapps (Jupyter lab, Datalore, ...) and IDEs (VSCode, IntelliJ, ...) • Code exécution requires a (kernel) for the target language • Python kernel is available by default and many others are available - 19
20. Kotlin notebook Demo - 20
21. Notable and new language features - 21
22. Native null safety in Kotlin • Compile errors • Syntactic features (elvis operator) - 22 • Not supported by javac (use IDE or tooling) • Non standardized (JDK + library annotations) • No syntactic features • Do not work with generics • Etc.
23. Explicit Backing fields (Since Kotlin 2) github.com/Kotlin/KEEP/issues/278 - 23
24. github.com/Kotlin/KEEP/issues/278 - 24 Explicit Backing fields (Since Kotlin 2)
25. youtrack.jetbrains.com/issue/KT-43871 - 25 Collection litterals (in discussion)
26. Et plein d’autres propositions Explicit backing field Array Literals guards Infinite loop github.com/Kotlin/KEEP x.com/kotlin Multi-field value classes Context parameters Kotlin statics and static extensions HexFormat
27. Conclusion - 27
28. - 28 KMP: improvements / expectations Architecture o WASM complete support on compose for web o BDD ❑ EXPOSED or Room ? ❑ SQLDelight: driver instatiate, sq file generation, driver for Webworker o kotlinx.coroutines : more dispatchers Tooling o A simpler build .gradle config ( with fleet & Ampere ?) o iOS ❑ xcodebuild on gradle native support ❑ Swift Package Manager (SPM) ❑ iOS support in IntelliJ ❑ logging logging improvment on iOS
29. Kotlin ecosystem : is it time to onboard it ? ✓ Achieved milestones: KMP + Kotlin 2.0 ✓ Comprehensive ecosystem ✓ For Backend devs: serious alternative to Java ✓ For Android devs: time to open to other platforms and stack - 29
30. Case studies | Kotlin Multiplatform Development Documentation https://www.jetbrains.com/help/kotlin-multiplatform-dev/case-studies.html https://blog.worldline.tech/2022/01/26/kotlin_multiplatform.html 🚀 Joanvi Orenga Sergio Casero Hernández
31. Ressources - 31 https://play.kotlinlang.org/koans https://www.youtube.com/@Kotlin https://kmp.jetbrains.com/ https://awl.li/kmp https://awl.li/kotlin https://github.com/terrakok/kmp-awesome
32. Contacts: Thanks for your attention! Any questions? @__brah @yostane - 32