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The State of KOTLIN ZAN MARKAN DEVELOPER EVANGELIST @ PUSHER

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The State of KOTLIN ZAN MARKAN DEVELOPER EVANGELIST @ PUSHER

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KOTLIN @ PUSHER Used for all new SDK development for Android ▸ Chatkit ▸ Push Notifications ▸ Feeds © @zmarkan 2018 | @pusher

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SURVEY GOALS ▸ Learning ▸ Promote Kotlin usage ▸ Give back to the community ▸ Hoping for 1000 responses © @zmarkan 2018 | @pusher

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DOING THE SURVEY ▸ December - Jan -> Questions ▸ Jan - March -> Survey running ▸ prize -> Nikola Curilovic © @zmarkan 2018 | @pusher

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2744 RESPONSES © @zmarkan 2018 | @pusher

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33% COMPLETION RATE © @zmarkan 2018 | @pusher

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13M14S AVG TIME TO COMPLETE © @zmarkan 2018 | @pusher

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CATEGORIES SURVEYED ▸ Usage ▸ Learning ▸ Features ▸ Zeitgeist ▸ Demographics © @zmarkan 2018 | @pusher

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STATE OF KOTLIN © @zmarkan 2018 | @pusher

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KOTLIN USAGE © @zmarkan 2018 | @pusher

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58% CURRENTLY USE KOTLIN ON A PROJECT © @zmarkan 2018 | @pusher

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HAVE YOU EVER USED KOTLIN? © @zmarkan 2018 | @pusher

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ON WHAT KIND OF PROJECTS? © @zmarkan 2018 | @pusher

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80% OF PEOPLE USE IT FOR ANDROID APPS © @zmarkan 2018 | @pusher

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WORK PROJECTS © @zmarkan 2018 | @pusher

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OTHER PROJECTS ▸ Games ▸ Scripting ▸ Experiments ▸ Learning & Koans ▸ Data Science © @zmarkan 2018 | @pusher

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55% vs 25% KOTLIN-ONLY PROJECTS © @zmarkan 2018 | @pusher

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KOTLIN IN WORK PROJECTS © @zmarkan 2018 | @pusher

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KOTLIN IN SIDE PROJECTS © @zmarkan 2018 | @pusher

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Other programming languages OF KOTLIN COMMUNITY © @zmarkan 2018 | @pusher

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JAVA, SWIFT, JS, NODE, PYTHON, ... © @zmarkan 2018 | @pusher

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MIGRATIONS FROM JAVA TO KOTLIN (and back again) © @zmarkan 2018 | @pusher

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87% MIGRATED JAVA TO KOTLIN © @zmarkan 2018 | @pusher

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HOW HAVE YOU DONE THE MIGRATION? © @zmarkan 2018 | @pusher

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25% REVERTED MIGRATION © @zmarkan 2018 | @pusher

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REASONS ▸ Reflection, dependencies - Dagger, GreenDAO, Realm & Data classes ▸ Early days: Spring DI and JaxRS ▸ Organisational reasons © @zmarkan 2018 | @pusher

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"Made to do it due to organizational rules" !

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"Another team took the code and didn’t want Kotlin" !

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"Migration tri!ered a number of changes in the Java code" !

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"Migration doesn't provide idiomatic kotlin and puts lot of nu! assertions" !

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LEARNING KOTLIN © @zmarkan 2018 | @pusher

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WHEN DID YOU PICK UP KOTLIN? © @zmarkan 2018 | @pusher

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WHY? ▸ Google, JetBrains support ▸ Tooling support ▸ Community folk: Jake Wharton, Christina Lee, Antonio Leiva ▸ JB folk: Hadi Hariri, Svetlana Isakova, Andrey Breslav © @zmarkan 2018 | @pusher

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"The popularity of Kotlin in a short period of time" !

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"Java was very verbose and Kotlin is just "

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"It's like Java++"

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TOP LEARNING RESOURCES © @zmarkan 2018 | @pusher

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DEVELOPER BACKGROUNDS © @zmarkan 2018 | @pusher

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FAVOURITE FEATURES © @zmarkan 2018 | @pusher

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FAVOURITE FEATURES © @zmarkan 2018 | @pusher

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Other FAVOURITE FEATURES ▸ when ▸ reified ▸ sealed classes ▸ lambdas © @zmarkan 2018 | @pusher

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FIRST ORDER FUNCTIONS? © @zmarkan 2018 | @pusher

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77% HAVE USED EXTENSION FUNCTIONS © @zmarkan 2018 | @pusher

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WHAT FOR? ▸ Reducing Android boilerplate ▸ Replacing Util classes ▸ “nicer” FP ▸ Conversions → strings, etc… ▸ DSLs © @zmarkan 2018 | @pusher

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"We felt like going overboard with them Now trying to find a happy medium" !

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"The most important use case is lambda parameters for DSL- style builders." !

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"For clean code mostly They make the code more readable" !

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29% HAVE USED COROUTINES © @zmarkan 2018 | @pusher

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WHAT FOR? ▸ Threading, I/O, UI ▸ Replacement for RxJava ▸ Lazy generators ▸ Serverside - with Ktor ▸ C# "expats" © @zmarkan 2018 | @pusher

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"I've used it with the library Arrow" !

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"Stopped using it because it’s experimental" ⚗

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"Fu!y in production for a fintech solution" !

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"They provide a very funny API when used to wrap JS promises" !

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26% USED NON-JVM FEATURES © @zmarkan 2018 | @pusher

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NON-JVM FEATURES © @zmarkan 2018 | @pusher

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BUILD TOOLS © @zmarkan 2018 | @pusher

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41% HAVE USED A DSL © @zmarkan 2018 | @pusher

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DSL USAGE © @zmarkan 2018 | @pusher

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24% HAVE DEVELOPED A DSL THEMSELVES © @zmarkan 2018 | @pusher

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WHAT FOR? ▸ ML & AI ▸ Jake Wharton's Testing Robots ▸ UI Declarations (Android & Java) ▸ Configurations, tooling ▸ Custom Data Structures - typed JSON © @zmarkan 2018 | @pusher

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REPLACING C WITH K? © @zmarkan 2018 | @pusher

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© @zmarkan 2018 | @pusher

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KOTLIN ZEITGEIST © @zmarkan 2018 | @pusher

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29% ARE MISSING THINGS IN KOTLIN © @zmarkan 2018 | @pusher

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MOST MISSED ▸ Ternary operator ▸ SAM for Kotlin classes ▸ Pattern matching ▸ More syntax sugar ▸ LINQ © @zmarkan 2018 | @pusher

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MORE MISSED... ▸ Literal bitwise operations ▸ Custom operations ▸ Single multiplatform IDE ▸ VueJS support ▸ Swift’s guard © @zmarkan 2018 | @pusher

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21% DISLIKE FEATURES... © @zmarkan 2018 | @pusher

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MOST HATED ▸ Companion objects / statics ▸ Too many "exotic" keywords ▸ Public by default ▸ No package-local modifier ▸ Not a dynamic language © @zmarkan 2018 | @pusher

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WHAT DO YOU LIKE THE MOST? ▸ Features ▸ moden programming language, similar to Swift, NOT Java ▸ Syntactic sugar, stdlib, easy to learn ▸ It's fun ▸ Platform independent © @zmarkan 2018 | @pusher

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"It can be read like a story" !

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"I smile again when writing code" !

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"The language doesn't get in the way of getting the job done" !

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"Mortal Kombat: The Programming Language" !

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DEMOGRAPHICS © @zmarkan 2018 | @pusher

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KOTLINERS ARE EVERYWHERE ! " © @zmarkan 2018 | @pusher

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EMPLOYMENT © @zmarkan 2018 | @pusher

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YEARS WORKING AS DEVELOPER OR SWE © @zmarkan 2018 | @pusher

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NUMBER OF PEOPLE YOUR ORG © @zmarkan 2018 | @pusher

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KOTLIN DEVS IN YOUR ORG © @zmarkan 2018 | @pusher

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SECTORS AND INDUSTRY © @zmarkan 2018 | @pusher

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FUTURE OF STATE OF KOTLIN? WHAT WOULD YOU LIKE TO ASK? © @zmarkan 2018 | @pusher

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Zan Markan [email protected] @zmarkan © @zmarkan 2018 | @pusher

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REFERENCES ▸ JW's whitepaper from Square: docs.google.com/document/d/ 1ReS3ep-hjxWA8kZi0YqDbEhCqTt29hG8P44aA9W0DM8 ▸ Kotlin Future Features survey: blog.jetbrains.com/kotlin/2017/06/ kotlin-future-features-survey-results ▸ StackOvervlow Survey: insights.stackoverflow.com/survey/2018 © @zmarkan 2018 | @pusher