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Having fun with Kotlin fun()

Avatar for Adnan A M Adnan A M
September 21, 2018
Programming
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Having fun with Kotlin fun()

Slides from my talk at droidcon Vienna 2018.

Avatar for Adnan A M

Adnan A M

September 21, 2018

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Transcript

  1. Having fun with Kotlin fun()

  2. What is a function ?

  3. “ Quote a long definition from Wikipedia here….. OR fun

    myFunction() { // pretty awesome function right here }

  4. Kotlin, give us a function !

  5. Kotlin, give us a function !

  6. Local Functions Functions within functions

  7. None

  8. Can’t unit test inner function Caveats/Gotchas Kotlin function doesn’t see

    local declarations in advance

  9. Single Expression Functions

  10. None

  11. Top Level Functions Extend functionality

  12. Extension Functions Extend functionality

  13. Extension function

  14. Resolved Statically Under the hood Receiver Object The static function

    is passed in the receiver object as a parameter

  15. Companion objects/Static classes Caveats/Gotchas Member Functions Win

  16. Named Arguments Thou shall name parameters

  17. None
  18. None
  19. None
  20. None

  21. Default Parameters

  22. None

  23. Java interop isn’t great, must specify all parameters when calling

    Caveats/Gotchas

  24. Lambda Expressions

  25. None

  26. Anonymous functions

  27. None

  28. Higher Order Functions

  29. None
  30. None
  31. None
  32. None
  33. None
  34. None
  35. None

  36. inline functions

  37. None
  38. None

  39. Let’s inline all Higher Order Functions ! Caveats/Gotchas No access

    to private variables/members
  40. None

  41. Non local returns

  42. None
  43. None
  44. None
  45. None
  46. None

  47. Standard Functions

  48. “ let, also, apply, run & with

  49. None
  50. None

  51. “ Scoping functions

  52. let

  53. Usage of let

  54. None

  55. apply

  56. Usage of apply

  57. None

  58. also

  59. Usage of also

  60. None

  61. run

  62. Usage of run

  63. None

  64. “ Transformation vs Mutating functions

  65. “ also, apply - Mutating Functions

  66. “ run, let - Transformation Functions

  67. Danke Any questions? You can find me at: ◇ @AdnanM0123

  68. Slide Theme ◇ Presentation template by SlidesCarnival ◇ Photographs by

    Unsplash