The State of Kotlin

State of the Kotlin Ecosystem

Transcript

1. The State of KOTLIN ZAN MARKAN DEVELOPER EVANGELIST @ PUSHER
2. The State of KOTLIN ZAN MARKAN DEVELOPER EVANGELIST @ PUSHER
3. KOTLIN @ PUSHER Used for all new SDK development for Android ▸ Chatkit ▸ Push Notifications ▸ Feeds © @zmarkan 2018 | @pusher
4. SURVEY GOALS ▸ Learning ▸ Promote Kotlin usage ▸ Give back to the community ▸ Hoping for 1000 responses © @zmarkan 2018 | @pusher
5. DOING THE SURVEY ▸ December - Jan -> Questions ▸ Jan - March -> Survey running ▸ prize -> Nikola Curilovic © @zmarkan 2018 | @pusher
6. 2744 RESPONSES © @zmarkan 2018 | @pusher
7. 33% COMPLETION RATE © @zmarkan 2018 | @pusher
8. 13M14S AVG TIME TO COMPLETE © @zmarkan 2018 | @pusher
9. CATEGORIES SURVEYED ▸ Usage ▸ Learning ▸ Features ▸ Zeitgeist ▸ Demographics © @zmarkan 2018 | @pusher
10. STATE OF KOTLIN © @zmarkan 2018 | @pusher
11. KOTLIN USAGE © @zmarkan 2018 | @pusher
12. 58% CURRENTLY USE KOTLIN ON A PROJECT © @zmarkan 2018 | @pusher
13. HAVE YOU EVER USED KOTLIN? © @zmarkan 2018 | @pusher
14. ON WHAT KIND OF PROJECTS? © @zmarkan 2018 | @pusher
15. 80% OF PEOPLE USE IT FOR ANDROID APPS © @zmarkan 2018 | @pusher
16. WORK PROJECTS © @zmarkan 2018 | @pusher
17. OTHER PROJECTS ▸ Games ▸ Scripting ▸ Experiments ▸ Learning & Koans ▸ Data Science © @zmarkan 2018 | @pusher
18. 55% vs 25% KOTLIN-ONLY PROJECTS © @zmarkan 2018 | @pusher
19. KOTLIN IN WORK PROJECTS © @zmarkan 2018 | @pusher
20. KOTLIN IN SIDE PROJECTS © @zmarkan 2018 | @pusher
21. Other programming languages OF KOTLIN COMMUNITY © @zmarkan 2018 | @pusher
22. JAVA, SWIFT, JS, NODE, PYTHON, ... © @zmarkan 2018 | @pusher
23. MIGRATIONS FROM JAVA TO KOTLIN (and back again) © @zmarkan 2018 | @pusher
24. 87% MIGRATED JAVA TO KOTLIN © @zmarkan 2018 | @pusher
25. HOW HAVE YOU DONE THE MIGRATION? © @zmarkan 2018 | @pusher
26. 25% REVERTED MIGRATION © @zmarkan 2018 | @pusher
28. REASONS ▸ Reflection, dependencies - Dagger, GreenDAO, Realm & Data classes ▸ Early days: Spring DI and JaxRS ▸ Organisational reasons © @zmarkan 2018 | @pusher
29. "Made to do it due to organizational rules" !
30. "Another team took the code and didn’t want Kotlin" !
31. "Migration tri!ered a number of changes in the Java code" !
32. "Migration doesn't provide idiomatic kotlin and puts lot of nu! assertions" !
33. LEARNING KOTLIN © @zmarkan 2018 | @pusher
34. WHEN DID YOU PICK UP KOTLIN? © @zmarkan 2018 | @pusher
35. 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
36. "The popularity of Kotlin in a short period of time" !
37. "Java was very verbose and Kotlin is just "
38. "It's like Java++"
39. TOP LEARNING RESOURCES © @zmarkan 2018 | @pusher
40. DEVELOPER BACKGROUNDS © @zmarkan 2018 | @pusher
41. FAVOURITE FEATURES © @zmarkan 2018 | @pusher
42. FAVOURITE FEATURES © @zmarkan 2018 | @pusher
43. Other FAVOURITE FEATURES ▸ when ▸ reified ▸ sealed classes ▸ lambdas © @zmarkan 2018 | @pusher
44. FIRST ORDER FUNCTIONS? © @zmarkan 2018 | @pusher
45. 77% HAVE USED EXTENSION FUNCTIONS © @zmarkan 2018 | @pusher
46. WHAT FOR? ▸ Reducing Android boilerplate ▸ Replacing Util classes ▸ “nicer” FP ▸ Conversions → strings, etc… ▸ DSLs © @zmarkan 2018 | @pusher
47. "We felt like going overboard with them Now trying to find a happy medium" !
48. "The most important use case is lambda parameters for DSL- style builders." !
49. "For clean code mostly They make the code more readable" !
50. 29% HAVE USED COROUTINES © @zmarkan 2018 | @pusher
51. WHAT FOR? ▸ Threading, I/O, UI ▸ Replacement for RxJava ▸ Lazy generators ▸ Serverside - with Ktor ▸ C# "expats" © @zmarkan 2018 | @pusher
52. "I've used it with the library Arrow" !
53. "Stopped using it because it’s experimental" ⚗
54. "Fu!y in production for a fintech solution" !
55. "They provide a very funny API when used to wrap JS promises" !
56. 26% USED NON-JVM FEATURES © @zmarkan 2018 | @pusher
57. NON-JVM FEATURES © @zmarkan 2018 | @pusher
58. BUILD TOOLS © @zmarkan 2018 | @pusher
59. 41% HAVE USED A DSL © @zmarkan 2018 | @pusher
60. DSL USAGE © @zmarkan 2018 | @pusher
61. 24% HAVE DEVELOPED A DSL THEMSELVES © @zmarkan 2018 | @pusher
62. WHAT FOR? ▸ ML & AI ▸ Jake Wharton's Testing Robots ▸ UI Declarations (Android & Java) ▸ Configurations, tooling ▸ Custom Data Structures - typed JSON © @zmarkan 2018 | @pusher
63. REPLACING C WITH K? © @zmarkan 2018 | @pusher
64. © @zmarkan 2018 | @pusher
65. KOTLIN ZEITGEIST © @zmarkan 2018 | @pusher
66. 29% ARE MISSING THINGS IN KOTLIN © @zmarkan 2018 | @pusher
67. MOST MISSED ▸ Ternary operator ▸ SAM for Kotlin classes ▸ Pattern matching ▸ More syntax sugar ▸ LINQ © @zmarkan 2018 | @pusher
68. MORE MISSED... ▸ Literal bitwise operations ▸ Custom operations ▸ Single multiplatform IDE ▸ VueJS support ▸ Swift’s guard © @zmarkan 2018 | @pusher
69. 21% DISLIKE FEATURES... © @zmarkan 2018 | @pusher
70. MOST HATED ▸ Companion objects / statics ▸ Too many "exotic" keywords ▸ Public by default ▸ No package-local modifier ▸ Not a dynamic language © @zmarkan 2018 | @pusher
71. 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
73. "It can be read like a story" !
74. "I smile again when writing code" !
75. "The language doesn't get in the way of getting the job done" !
76. "Mortal Kombat: The Programming Language" !
77. DEMOGRAPHICS © @zmarkan 2018 | @pusher
78. KOTLINERS ARE EVERYWHERE ! " © @zmarkan 2018 | @pusher
79. EMPLOYMENT © @zmarkan 2018 | @pusher
80. YEARS WORKING AS DEVELOPER OR SWE © @zmarkan 2018 | @pusher
81. NUMBER OF PEOPLE YOUR ORG © @zmarkan 2018 | @pusher
82. KOTLIN DEVS IN YOUR ORG © @zmarkan 2018 | @pusher
83. SECTORS AND INDUSTRY © @zmarkan 2018 | @pusher
84. FUTURE OF STATE OF KOTLIN? WHAT WOULD YOU LIKE TO ASK? © @zmarkan 2018 | @pusher
85. Zan Markan zan@pusher.com @zmarkan © @zmarkan 2018 | @pusher
86. 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