The State of Kotlin

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

27. None

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
72. None

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