Kotlin native in 10 min

Everything Kotlin native in 10min

Transcript

1. Kotlin native in 10 slides
2. @MartinBonnin apollographql/apollo-android Hearthsim/HSTracker
3. • Created in 2011 by Jetbrains • Type inference, nullability, extension functions, lambdas, etc... 1. What is Kotlin ?
4. 2. Swift ~ Kotlin class FrenchKit { func hello(name: String?) -> String { guard let name_ = name else { return "Hello unknown person" } return "Hello \(name_)" } } class Frenchkit { fun hello(name: String?): String { if (name != null) { return "Hello $name" } else { return "Hello unknown person" } } }
5. 3. Compiling to native code Kotlin Compiler FrenchKit.kt LLVM IR LLVM Machine code Kotlin Tooling hello.framework frenchkit.class
6. 4. Hello.h __attribute__((objc_subclassing_restricted)) __attribute__((swift_name("FrenchKit"))) @interface HelloFrenchKit : HelloBase - (instancetype)init __attribute__((swift_name("init()"))) __attribute__((objc_designated_initializer)); + (instancetype)new __attribute__((availability(swift, unavailable, message="use object initializers instead"))); - (NSString *)helloName:(NSString * _Nullable)name __attribute__((swift_name("hello(name:)"))); @end;
7. 5. Swift interop Kotlin Swift class class interface protocol String String List Array Map Dictionary Function type Function type ∅ Struct Sealed classes, inline classes ∅ https://kotlinlang.org/docs/reference/native/objc_interop.html
8. 6. Consuming Frameworks • Monorepo + build phase • Cocoapods • Host compiled binaries?
9. 7. It works!
10. 8. Debugging
11. 9. KMM (Kotlin Multiplatform Mobile)
12. • JVM: GC • Objective-C: ARC • K/N: Reference Counting + Cycle detector • Variables must be frozen when accessed from multiple threads … • This is all going to change... 10. The memory model Elephant by Josh McGinn
13. • Ecosystem ◦ SQL Delight ◦ Ktor ◦ Blue-Falcon ◦ Koin • Samples ◦ joreilly/PeopleInSpace ◦ JetBrains/kotlinconf-app ◦ HearthSim/HSTracker Conclusion
14. • Memory model ◦ Jetbrains Memory Management Roadmap ◦ Kotlin native concurrency explained ◦ Why the K/N memory model cannot hold Resources
15. Resources • A journey to Kotlin Multiplatform • http://nilhcem.com/swift-is-like-kotlin/ • https://kotlinlang.org/docs/reference/native/objc _interop.html • https://kotlinlang.org/docs/reference/native-ove rview.html • https://arnestockmans.be/blog/build-run-jetpac k-compose-for-desktop
16. Merci! @MartinBonnin bit.ly/10-min-of-kotlin