The Journey of Craftmanship – Kotlin in Action
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Kotlin is a pragmatic programming language for the JVM and Android that combines OOP and functional features. It focuses on interoperability, safety, clarity, and tooling support. The document discusses why Kotlin is needed, noting that Java is stuck on older versions without features like lambdas, streams, and the java.time API. It also discusses problems with Java like inability to add methods to platform types, nullability problems, mutability problems, and verbosity. The document promotes Kotlin as a modern, concise, safe, and expressive language compared to Java.
The Journey of Craftmanship – Kotlin in Action
- 1. Raditya Gumay GOJEK @r_adiit Jakarta The Journey of Craftmanship – Kotlin in Action
- 2. Kotlin is a pragmatic programming language for JVM and Android that combines 00 and functional features and is focused on Interoperability, safety, clarity, and tooling support. https://blog.jetbrains.com/kotlin/2016/02/kotlin-1-0-released-pragmatic-language-for-jvm- and-android/
- 3. Why do we need Kotlin? Jakarta
- 4. Why do we need Kotlin? Jakarta Stuck on Java 7(ish) - No javax.time - No streams - No lamdas
- 5. Why do we need Kotlin? Jakarta Stuck on Java 7(ish) - No javax.time - No streams - No lamdas ThreeTenABP RxJava RetroLambda
- 6. Why do we need Kotlin? Jakarta Stuck on Java 7(ish) Java language restrictions and problems
- 7. Why do we need Kotlin? Jakarta Java language restrictions and problems - Inability to add method to platform types AKA extension function (we usually ended up with: “Util”) - Nullability problems (billions dollar mistake) - Mutability problems (side effect? : ”oh no!”) - Verbosity (will talk more later. Ex: parcelable, equal)
- 13. Extension Function more sample in `SnackBarExtension.kt`
- 14. Nullability
- 15. Nullability
- 16. Nullability
- 17. Nullability
- 18. Nullability You can specify @NonNull as default and annotate only @Nullable type
- 21. Immutability Imutable = final = thread safe
- 22. Immutability
- 23. Immutability BadGood - Prevent to change the property in middle of transaction (should use copy) - Prevent side effect (if you using pure function) - Creating new object every single time you do copy. (this will cause a problem of you do copy many object) - Prevent the caller mutate the data
- 24. Immutability
- 25. Immutability
- 26. GO KOTLIN!! Verbosity Kotlin in Action - 14
- 32. Kotlin is modern language Concise, Safe, Expressive
- 33. Q & A #DevFest18 #r_adiit “question” https://github.com/radityagumay/gdgjakarta2018