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Kotlin 101

Avatar for Ivan Bruel Ivan Bruel
October 21, 2015
Programming
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Kotlin 101

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

Avatar for Ivan Bruel

Ivan Bruel

October 21, 2015
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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 [email protected]