Kotlin 101

A brief overview on how Kotlin works and how it pairs alongside Java in an Android world.

Transcript

1. Kotlin 101 @ BLOCO.IO
2. Ivan Bruel Mobile Developer @ Faber Ventures twitter.com/ivanbruel github.com/ivanbruel
3. Faber-Dev Bruno Oliveira Mobile Developer Afonso Tsukamoto Backend Developer João Horta Frontend Developer Marcelo Lebre Lead Developer Ivan Bruel Mobile Developer
4. Android and Java A brief history lesson
5. Java 6 2006 Android 1.0 2008 Java 7 2011 Java 7 support 2013 Java 8 2014 Java 8 support ??? Android and Java Timeline
6. Lollipop 20% KitKat 43% Jelly Bean 29% Ice Cream Sandwich 4% Gingerbread 4% Platform versions Android and Java
7. Java 7 63% Java 6 37% Android and Java Java versions
8. What’s wrong with Java? Aside from installing the Ask toolbar
9. What’s wrong with Java? Null references
10. What’s wrong with Java? Raw types
11. What’s wrong with Java? Covariant Arrays
12. What’s wrong with Java? Checked Exceptions
13. Kotlin Statically typed programming language for the JVM, Android and the browser
14. Kotlin Why does it matter? 100% interoperable with Java Java 6 compatible
15. Kotlin What does it remove from Java? Checked Exceptions Non-class primitive types Non-private fields Static members Wildcard types
16. Kotlin What’s new? Lambdas Properties Data classes Primary constructors Function literals & inline functions Class delegation Extension functions Type inference Null-safety Singletons Smart casts Declaration-site variance String templates Range expressions
17. Kotlin How does it work? Kotlin source Java source kotlinc javac bytecode Android ART Dalvik
18. Kotlin Hello, World! { }
19. Kotlin Hello, World!
20. Kotlin Type inference
21. Kotlin Null-safety NullPointerException Optional Safe!
22. Kotlin Smart casts Smart cast Smart cast
23. Kotlin String templates
24. Kotlin Range expressions
25. Kotlin Higher order functions and lambdas
26. Kotlin In-line functions
27. Kotlin Extension functions
28. Kotlin Properties and Constructors
29. Kotlin Properties and Constructors
30. Kotlin Singletons
31. Kotlin Companion objects
32. Kotlin But wait, there’s more! kotlinlang.org “Why Kotlin is my next programming language” @ medium reddit.com/r/kotlin stackoverflow.com
33. Get to know us faber-ventures.com ibruel@faber-ventures.com