Kotlin in the Real World

Kotlin is a modern language developed by JetBrains, the makers of the excellent Intellij on which Android Studio is based. Having used Kotlin in production on an android app for the past few months, Philippe will share what’s great about the language and what the caveats are. This talk will cover language features, tooling support, performance and interoperability with java. By the end, you should have a good understanding of the pros and cons of the language and be able to decide if you want to try it out.

Transcript

1. Kotlin In the Real World Philippe Breault @pbreault
2. • 2010 - work started • 2011 - announced • 2016 - official 1.0 release • 2017 - 1.1 release The Dates
3. • Alternatives? Ceylon & Scale? • JVM Interop • Easily Toolable • Open Source
4. • Adds about 1mb to the apk • Around 6700 methods • Not Officially Supported by Google
5. Classes, Pojos and Pokos
6. Java Kotlin
7. Java Kotlin
8. Java
9. Kotlin
10. Java
11. Kotlin
12. Functions
13. Java Kotlin
14. Java Kotlin
15. Java Kotlin Kotlin
18. More on functions later!
19. Variables
20. val marks the variable as final
22. Control Flow
26. Uses the Range Class
31. Extensions
32. Java
33. Kotlin
34. Examples of real world scenarios
35. Null Safety Avoiding the billion dollar mistake
42. Lambdas
47. Generics
50. Standard Library
51. Variable types
52. Java Kotlin
54. Collections
57. Wrapping up!
58. There are a lot of other interesting features • Infix extension methods • Interfaces • Operator Overloading • Interface Delegation • Property Delegation • Destructuring • Safe Singletons • Annotation processing • Tail recursion • Companion objects • Init blocks • Enums • Multiline strings • Dot notation • Javascript backend • otlin native • Kotlin 1.1 • Gradle kotlin script
59. How to try it
61. • Great tooling support • Lambdas • Extensions • Null-Safety • Data Classes • Interoperable with Java • Terse • Fun to use • Another one to really drive the point home that the yays are bigger than the nays Yay! Nay • Not the official language • Slightly bigger apk • Adds 6700 methods • Slower build with annotation processing for now • Not instant run friendly, for now
62. Thank You Philippe Breault @pbreault